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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Description
The AL9910/A high voltage PWM LED driver-controller provides an efficient solution for offline high brightness LED lamps from rectified line voltages ranging from 85VAC up to 277VAC. The AL9910 drives external MOSFETs at switching frequencies up to 300kHz, with the switching frequency determined by a single resistor. The AL9910 topology creates a constant current through the LEDs providing constant light output. The output current is programmed by one external resistor and is ultimately determined by the external MOSFET chosen and therefore allows many low current LEDs to be driven as well as a few high current LEDs The LED brightness can be varied by both Linear and PWM dimming using the AL9910's LD and PWM_D pins respectively. The PWM_D input operates with duty ratio of 0-100% and frequency of up to several kHz. The AL9910 can withstand input voltages up to 500V which makes it very resilient to transients at standard mains voltages. As well as standard SO-8 package the AL9910 is available in the thermally enhanced SO-8EP package.
Pin Assignments
(Top View) VIN CS GND Gate 1 2 3 4 SO-8
(Top View) VIN CS GND Gate 1 2 3 4 SO-8EP
AL9910
AL9910
8 7 6 5
Rosc LD VDD PWM_D
NEW PRODUCT
8 7 6 5
Rosc LD VDD PWM_D
Features
* * * * >90% Efficiency Universal rectified 85 to 277VAC input range Input voltage up to 500V Internal voltage regulator removes start-up resistor o 7.5V MOSFET drive - AL9910 o 10V MOSFET drive - AL9910A Drives LED Lamps with both high and low current LEDs LED brightness control with Linear and PWM dimming Internal Thermal Protection (OTP) SO-8 and SO-8EP in "Green" Molding Compound (No Br, Sb) with Lead Free Finish/ RoHS Compliant (Note 1)
Applications
* * * * * LED offline lamps High voltage dc-dc LED Driver Signage and Decorative LED Lighting Back Lighting of Flat Panel Displays General purpose constant current source
* * * * *
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
C3 L1 Q1
D1 VAC IN BR1 C2 PWM_D ROSC GND ROSC CS C1 VDD LD VIN
AL9910/A
GATE
RSENSE
AL9910/AL9910A
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Pin Descriptions
Pin Name VIN CS GND Gate PWM_D SO-8 1 2 3 4 5 SO-8EP 1 2 3 4 5 Input voltage Senses LED string current Device ground Drives the gate of the external MOSFET Low Frequency PWM Dimming pin, also Enable input. Internal 100k pull-down to GND Internally regulated supply voltage. * 7.5V nominal for AL9910 and * 10V nominal for AL9910A. Can supply up to 1 mA for external circuitry. A sufficient storage capacitor is used to provide storage when the rectified AC input is near the zero crossing. Linear Dimming by changing the current limit threshold at current sense comparator Oscillator control. A resistor connected between this pin and ground sets the PWM frequency. Exposed Pad (bottom). Connect to GND directly underneath the package. Descriptions
NEW PRODUCT
VDD
6
6
LD ROSC EP PAD
7 8 N/A
7 8 EP
Absolute Maximum Ratings (Note 2)
Symbol VIN(MAX) VCS VLD VPWM_D VGATE VDD(MAX) Parameter Maximum input voltage, VIN, to GND Maximum CS input pin voltage relative to GND Maximum LD input pin voltage relative to GND Maximum PWM_D input pin voltage relative to GND Maximum GATE pin voltage relative to GND Maximum VDD pin voltage relative to GND Continuous Power Dissipation (TA = 25C) SO-8 (derate 6.3mW/C above +25C) SO-8EP (derate at 22mW/C above 25C) TJ TST ESD HBM ESD MM
Notes:
Ratings -0.5 to +520 -0.3 to 0.45 -0.3 to (VDD + 0.3) -0.3 to (VDD + 0.3) -0.3 to (VDD + 0.3) 12 630 2200 +125 -65 to 150 1500 300
Unit V V V V V V mW mW C C V V
Junction Temperature Range Storage Temperature Range Human Body Model ESD Protection (Note 3) Machine Model ESD Protection (Note 3)
2. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. 3. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices
Recommended Operating Conditions
Symbol VINDC TA VDD VEN(lo) VEN(hi)
Notes:
Parameter Input DC supply voltage range Ambient temperature range Maximum recommended voltage applied to VDD pin (Note 4) Pin PWM_D input low voltage Pin PWM_D input high voltage AL9910 AL9910A AL9910 AL9910A
Min 15.0 20.0 -40
0 2.4
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Max 500 500 85 10 11 1 VDD
Unit V C V V
4. When using the AL9910 in isolated LED lamps an auxiliary winding might be used.
AL9910/AL9910A
Document number: DS 35103 Rev. 2 - 2
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Electrical Characteristics
(Over recommended operating conditions unless otherwise specified - TA = 25C) Symbol Parameter Conditions IInsd VDD IDD(ext) Shut-down mode supply current Internally regulated voltage VDD current available for external circuitry VDD under voltage lockout threshold Pin PWM_D to GND, VIN = VIN(Min) (Note 5) VIN = VIN(Min)~500V, (Note 5) lDD(ext)=0, Gate pin open AL9910 AL9910A AL9910 AL9910A 7.0 9.5
Min
Typ. 0.50 0.65 7.5 10
Max 1 1.2 8.0 10.5 1.0
Unit mA V mA V mV
VIN = VIN(Min) to 100V (Note 5 & 6) VDD rising VDD falling VPWM_D = 5V TA = -40C to +85C IOUT = 10mA IOUT = -10mA ROSC = 1M ROSC = 226k fPWMhf = 25kHz, at GATE, CS to GND. 0 160 250 VCS = 0.45V, VLD = VDD VIN = 20V, VLD = 0.15, VCS = 0 to 0.22V after TBLANK CGATE = 500pF CGATE = 500pF 30 30 150 50 SO-8 (Note 7) SO-8EP (Note 8) SO-8 (Note 7) SO-8EP (Note 8) 110 66 22 9 AL9910 AL9910A AL9910 AL9910A 150 225 VDD -0.3 0 20 80 25 100 6.4 8.4 6.7 9 500 750 200 250
NEW PRODUCT
UVLO
7 9.6
VDD under voltage lockout UVLO hysteresis RPWM_D PWM_D pull-down resistance VCS(hi) Current sense threshold voltage VGATE(hi) GATE high output voltage VGATE(lo) GATE low output voltage fOSC DMAXhf VLD tBLANK tDELAY tRISE tFALL TSD TSDH JA JC
Notes:
250 275 VDD 0.3 30 120 100 250 440 300 50 50
k mV V V kHz % mV ns ns ns ns C C/W C/W
Oscillator frequency Maximum Oscillator PWM Duty Cycle Current sense blanking interval Delay from CS trip to GATE lo GATE output rise time GATE output fall time Thermal shut down Thermal shut down hysteresis Thermal Resistance Junction-toAmbient Thermal Resistance Junction-toCase
Linear Dimming pin voltage range TA = <85C, VIN = 20V
5. VIN(Min) for the AL9910 is 15V and for the AL9910A it is 20V 6. Also limited by package power dissipation limit, whichever is lower. 7. Device mounted on FR-4 PCB (25mm x 25mm 1oz copper, minimum recommended pad layout on top. For better thermal performance, larger copper pad for heat-sink is needed. 8. Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and thermal vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed.
AL9910/AL9910A
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Typical Characteristics
3.0
CURRENT SENSE THRESHOLD (mV)
460 440 420
INPUT CURRENT (A)
V IN = 400V
2.5 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -40
400
V IN = 15V
380 360 340 320 300 280 -40 -15 10 35 60 AMBIENT TEMPERATURE ( C) Input Current vs. Ambient Temperature
450
NEW PRODUCT
-15 10 35 60 85 AMBIENT TEMPERATURE (C) Change in Current Sense Threshold vs. Ambient Temperature
85
1.5
SHORT CIRCUIT OUTPUT CURRENT (mA)
ILED(NOM) = 180mA
1.0
CHANGE IN FREQUENCY (%)
400
0.5 0.0 -0.5
R OSC = 1M R OSC = 226k
350
300
250
-1.0 -1.5 -2.0 -40
200
-15 10 35 60 85 AMBIENT TEMPERATURE (C) Change in Oscillation Frequency vs. Ambient Temperature
100 90 80 70
ILED = 281mA V IN = 264V TA = 23.5C
150 85 105 125 145 165 185 205 225 245 265 INPUT VOLTAGE (VRMS ) 180mA LED Driver Short Circuit Output Current vs. Input Voltage
IO UT MAX (%)
60 50 40 30 20 10 0 0 50 100 150 200 250 V LD DIMMING CONTROL (mV) I OUT MAX vs. V LD Dimming Control 300
AL9910/AL9910A
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Typical Characteristics (Continued) Measured using AL9910EV4
200
15 LEDs 14 LEDs
95
190
18 LEDs
EFFICIENCY (%)
180
IOUT MAX (mA)
90
17 LEDs
16 LEDs
170
17 LEDs
NEW PRODUCT
14 LEDs 16 LEDs
160
85
15 LEDs
150
18 LEDs
140 85
105 125 145 165 185 205 225 245 265 INPUT VOLTAGE (VRMS ) 180mA LED Driver Output Current vs. Input Voltage
80 85
105 125 145 165 185 205 225 245 265 INPUT VOLTAGE (VRMS ) 180mA LED Driver Efficiency vs. Input Voltage
0.95
18 LEDs
12
18 LEDs 17 LEDs
0.9
10
POWER FACTOR
0.85
16 LEDs
POWER (W)
8
15 LEDs 14 LEDs
16 LEDs
0.8
15 LEDs
17 LEDs
6
0.75
14 LEDs
0.7 85
105 125 145 165 185 205 225 245 265 INPUT VOLTAGE (VRMS ) 180mA LED Driver Power Factor vs. Input Voltage
105 125 145 165 185 205 225 245 265 INPUT VOLTAGE (VRMS ) 180mA LED Driver Input Power Dissipation vs. Input Voltage
4
85
AL9910/AL9910A
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Applications Information
The AL9910 is very versatile and is capable of operating in isolated or non-isolated topologies. It can also be made to operate in continuous as well as discontinuous conduction mode.
VIN
VIN
LDO
7.5/10V OSC
ROSC
NEW PRODUCT
VDD
VDD 250mV LD S R O
GATE
CS OTP
PWM_D
100k
AL9910/AL9910A
RSENSE
GND
Figure 1. Functional block diagram
The AL9910 contains a high voltage LDO (see figure 1) the output of the LDO provides a power rail to the internal circuitry including the gate driver. A UVLO on the output of the LDO prevents incorrect operation at low input voltage to the VIN pin. In a non-isolated Buck LED driver when the gate pin goes high the external power MOSFET Q1 is turned on causing current to flow through the LEDs, inductor (L1) and current sense resistor (RSENSE). When the voltage across RSENSE exceeds the current sense pin threshold the external MOSFET Q1 is turned off. The stored energy in the inductor causes the current to continue to flow through the LEDs via diode D1. The AL9910's LDO provides all power to the rest of the IC including Gate drive this removes the need for large high power start-up resistors. This means that operate correctly it requires around 0.5mA from the high voltage power rail. The LDO can also be used to supply up to 1mA to external circuits. The AL9910 operates and regulates by limiting the peak current of the external MOSFET; the peak current sense threshold is nominally set at 250mV. The same basic operation is true for isolated topologies, however in these the energy stored in the transformer delivers energy to LEDs during the off-cycle of the external MOSFET.
Design parameters
Setting the LED current
In the non-isolated buck converter topology, figure 1, the average LED current is not the peak current divided by 2 - however, there is a certain error due to the difference between the peak and the average current in the inductor. The following equation accounts for this error: 250mV . R SENSE = (ILED + (0.5 * IRIPPLE )))
AL9910/AL9910A
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Applications Information (Continued)
Setting Operating Frequency
The AL9910 is capable of operating over a 25 and 300 kHz switching frequency range. The switching frequency is programmed by connecting an external resistor between ROSC pin and ground. The corresponding oscillator period is: tOSC =
Rosc + 22 s 25
with ROSC in k
The switching frequency is the reciprocal of the oscillator period. Typical values for ROSC vary from 75k to 1M
NEW PRODUCT
When driving smaller numbers of LEDs, care should be taken to ensure that tON > tBLANK. The simplest way to do this is to reduce/limit the switching frequency by increasing the ROSC value. Reducing the switching frequency will also improve the efficiency. When operating in buck mode the designer must keep in mind that the input voltage must be maintained higher than 2 times the forward voltage drop across the LEDs. This limitation is related to the output current instability that may develop when the AL9910 operates at a duty cycle greater than 0.5. This instability reveals itself as an oscillation of the output current at a subharmonic (SBO) of the switching frequency. The best solution is to adopt the so-called constant off-time operation as shown in Figure 2. The resistor (ROSC) is, connected to ground by default, to set operating frequency. To force the AL9910 to enter constant OFF time mode ROSC is connected to the gate of the external MOSFET. This will decrease the duty cycle from 50% by increasing the total period, tOFF + tON.
VIN VDD LD VIN Q1
AL9910/A GATE
CS
PWM_D ROSC GND
ROSC
Figure 2. Constant off-time configuration
The oscillator period equation above now defines the AL9910 off time, tOFF. When using this mode the nominal switching frequency is chosen and from the nominal input and output voltages the off-time can be calculated:
VOUT ( nom ) 1 tOFF = 1 - VIN ( nom ) fOSC
From this the timing resistor, ROSC, can be calculated: R OSC = (t OFF (s) 25 ) - 22(k )
AL9910/AL9910A
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Applications Information (Continued)
Inductor Selection
The non-isolated buck circuit, Figure 1, is usually selected and it has two operation modes: continuous and discontinuous conduction modes. A buck power stage can be designed to operate in continuous mode for load current above a certain level usually 15% to 30% of full load. Usually, the input voltage range, the output voltage and load current are defined by the power stage specification. This leaves the inductor value as the only design parameter to maintain continuous conduction mode. The minimum value of inductor to maintain continuous conduction mode can be determined by the following example. The required inductor value is determined from the desired peak-to-peak LED ripple current in the inductor; typically around 30% of the nominal LED current. (VIN - VLEDs ) x D Where D is duty cycle L= (0.3 x ILED ) x fOSC The next step is determining the total voltage drop across the LED string. For example, when the string consists of 10 HighBrightness LEDs and each diode has a forward voltage drop of 3.0V at its nominal current; the total LED voltage VLEDS is 30V.
NEW PRODUCT
Dimming
The LED brightness can be dimmed either linearly (using the LD pin) or via pulse width modulation (using the PWM-D pin); or a combination of both - depending on the application. Pulling the PWM_D pin to ground will turn off the AL9910. When disabled, the AL9910's quiescent current is typically 0.5mA (0.65 for AL9910A). Reducing the LD voltage will reduce the LED current but it will not entirely turn off the external power transistor and hence the LED current - this is due to the finite blanking period. Only the PWM_D pin will turn off the power transistor. Linear dimming is accomplished by applying a 45 to 250mV analog signal to the LD pin. This overrides the default 250mV threshold level of the CS pin and reduces the output current. If an input voltage greater than 250mV is applied to the LD then the output current will not change. The LD pin also provides a simple cost effective solution to soft start; by connecting a capacitor to the LD pin down to ground at initial power up the LD pin will be held low causing the sense threshold to be low. As the capacitor charges up the current sense threshold will increase thereby causing the average LED current to increase. PWM dimming is achieved by applying an external PWM signal to the PWM_D pin. The LED current is proportional to the PWM duty cycle and the light output can be adjusted between zero and 100%.. The PWM signal enables and disables the AL9910 - modulating the LED current. The ultimate accuracy of the PWM dimming method is limited only by the minimum gate pulse width, which is a fraction of a percentage of the low frequency duty cycle. PWM dimming of the LED light can be achieved by turning on and off the converter with low frequency 50Hz to 1000Hz TTL logic level signal. With both modes of dimming it is not possible to achieve average brightness levels higher than the one set by the current sense threshold level of the AL9910. If a greater LED current is required then a smaller sense resistor should be used
Output Open Circuit Protection
The non-isolated buck LED driver topology provides inherent protection against an open circuit condition in the LED string due to the LEDs being connected in series with the inductor. Should the LED string become open circuit then no switching occurs and the circuit can be permanently left in this state with damage to the rest of the circuit.
AL9910/AL9910A
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Applications Information (Continued)
AC/DC Off-Line LED driver
The AL9910 is a cost-effective off-line buck LED driver-controller specifically designed for driving LED strings. It is suitable for being used with either rectified AC line or any DC voltage between 15-500V. See figure 3 for typical circuit. LED +
C3 L1 LED Q1 GATE CS RSENSE
D1 VAC IN C1 BR1 C2 LD VDD VIN
NEW PRODUCT
AL9910/A
PWM_D ROSC GND ROSC
Figure 3. Typical Application Circuit (without PFC) Buck design equations: V D = LEDs VIN
t ON =
L
D fosc
( VIN - VLEDs ) x t ON 0.3 x ILED 0.25 where ILED x 0.3 = IRIPPLE ILED + (0.5 x (ILED x 0.3))
R SENSE =
Design example For an AC line voltage of 120V the nominal rectified input voltage VIN = 120V*1.41 = 169V. From this and the LED chain voltage the duty cycle can be determined:
D = VLEDs /VIN = 30/169 = 0.177 From the switching frequency, for example fOSC = 50kHz, the required on-time of the external MOSFET can be calculated: tON = D/fOSC = 3.5 s The value of the inductor is determined as follows: L = (VIN - VLEDs) * tON /(0.3 * ILED) = 4.6mH
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Applications Information (Continued)
Input Bulk Capacitor
For Offline lamps an input bulk capacitor is required to ensure that the rectified AC voltage is held above twice the LED string voltage throughout the AC line cycle. The value can be calculated from: CIN Pin x (1 - Dch ) 2 x VLine _ min x 2fL x VDC _ max
Where
NEW PRODUCT
Dch : Capacity charge work period, generally about 0.2~0.25 fL : Input frequency for full range (85~265VRMS)
VDC _ max Should be set 10~15% of
2 VLine _ min
If the capacitor has a 15% voltage ripple then a simplified formula for the minimum value of the bulk input capacitor approximates to: I x VLEDs x 0.06 CMIN = LED VIN 2
Power Factor Correction
If power factor improvement is required then for the input power less than 25W, a simple passive power factor correction circuit can be added to the AL9910 typical application circuit. Figure 4 shows that passive PFC circuitry (3 current steering diodes and 2 identical capacitors) does not significantly affect the rest of the circuit. Simple passive PFC improves the line current harmonic distortion and achieves a power factor greater than 0.85. Passive PFC LED +
C1 D1 VAC IN BR1 VDD LD VIN Q1 GATE CS RSENSE ROSC LED L1 C4
AL9910/A
C2
C3
PWM_D ROSC GND
Figure 4. Typical Application Circuit with passive PFC
Each of these identical capacitors should be rated for half of the input voltage and have twice as much capacitance as the calculated CMIN of the buck converter circuit without passive PFC (see above section on bulk capacitor calculation). For further design information please see AN75 from the Diodes website.
AL9910/AL9910A
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UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Applications Information (Continued)
DC-DC Buck LED driver
The design procedure for an ac input buck LED driver outlined in the previous chapters equally applies DC input LED drivers. When driving long LED chains care should be taken not to induce SBO - maximum LED chain voltage should be less half of VIN. So either maximum duty cycle should be kept below 50% or use of constant off-time removes this issue.
DC-DC Boost LED driver
NEW PRODUCT
Due to the topology of the AL9910 LED driver-controller it is capable of being used in boost configurations - at reduced accuracy. The accuracy can be improved by measuring the LED current with an op amp and use the op amp's output to drive the LD pin. A Boost LED driver is used when the forward voltage drop of the LED string is higher than the input supply voltage. For example, the Boost topology can be appropriate when input voltage is supplied by a 48V power supply and the LED string consists of twenty HB LEDs, as the case may be for a street light.
L1 C1 VIN C2 LD ROSC CS GND RSENSE VDD VIN D1 Q1 C3 GATE
AL9910/A
PWM_D
ROSC
Figure 5. Boost LED driver
In a Boost converter, when the external MOSFET is ON the energy is stored in the inductor which is then delivered to the output when the external MOSFET switches OFF. If the energy stored in the inductor is not fully depleted by the next switching cycle (continuous conduction mode) the DC conversion between input and output voltage is given by: V - VIN V D = OUT VOUT = IN 1- D VOUT From the switching frequency, fOSC, the on-time of the MOSFET can be calculated: D t ON = fOSC From this the required inductor value can be determined by: V t L = IN ON 0.3 ILED
The Boost topology LED driver requires an output capacitor to deliver current to the LED string during the time that the external MOSFET is on. In boost LED driver topologies if the LEDs should become open circuit damage may occur to the power switch and so some form of detection should be present to provide Over-voltage detection/protection.
AL9910/AL9910A
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Ordering Information
AL9910 X XX - 13
Variant Blank : 7.5V VDD A : 10V VDD Package S : SO-8 SP : SO-8EP
13" Tape and Reel Quantity Part Number Suffix
Packing 13 : 13" Tape & Reel
NEW PRODUCT
Device
Package Code
Packaging (Note 7)
AL9910S-13 AL9910AS-13 AL9910SP-13 AL9910ASP-13
Notes:
S S SP SP
SO-8 SO-8 SO-8EP SO-8EP
2500/Tape & Reel 2500/Tape & Reel 2500/Tape & Reel 2500/Tape & Reel
-13 -13 -13 -13
7. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf.
Marking Information
(1) SO-8 & SO-8EP
(Top View) 8 Logo Part Number 9910 for 7.5V 9910A for 10V 7 6 5
9910 X
YY WW X X
YY : Year : 08, 09, 10~ WW : Week : 01~52; 52 represents weeks 52 and 53 X : Internal Code X : A~Z : Green
1
2
3
4
AL9910/AL9910A
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER Package Outline Dimensions (All Dimensions in mm)
(1) Package Type: SO-8
3.85/3.95
5.90/6.10
0.10/0.20
0.254 0.62/0.82
Gauge Plane Seating Plane
Detail "A"
NEW PRODUCT
7~9 1.30/1.50 1.75max. 0.15/0.25
0.35max. 45
7~9
Detail "A"
0/8
1.27typ 4.85/4.95
0.3/0.5
8x-0.60 5.4 6x-1.27 8x-1.55
Land Pattern Recommendation (Unit: mm)
(2) Package Type: SO8-EP
Detail "A" Exposed pad
7X~ 9X
3.85/3.95
5.90/6.10
3.70/4.10
45X
0.35max.
7X~1 9X
1.30/1.50 1.75max.
0.15/0.25 3.3Ref.
1
Bottom View
1.27typ 4.85/4.95 1
0/0.13
0.62/0.82
Detail "A"
8x-0.60
Exposed pad
6x-1.27
8x-1.55
Land Pattem Recommendat ion (Unit:mm)
5.4
AL9910/AL9910A
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0.254
0.3/0.5
2.4Ref.
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AL9910/AL9910A
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER
IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness.
NEW PRODUCT
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2011, Diodes Incorporated www.diodes.com
AL9910/AL9910A
Document number: DS 35103 Rev. 2 - 2
14 of 14 www.diodes.com
March 2011
(c) Diodes Incorporated

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