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MP1016
Full System Precision CCFL Driver
Monolithic Power Systems
General Description
The MP1016 is a Power IC that offers a true complete solution optimized for driving a Cold Cathode Fluorescent Lamp (CCFL). This Power IC converts unregulated DC voltage to a nearly pure sine wave required to ignite and operate the CCFL. Based on proprietary power topology and control techniques (patented), it greatly increases the power conversion efficiency. The MP1016 implements precision burst mode dimming without any additional external components. The MP1016 offers four distinct performance advantages: 1. 2. 3. 4. More light for less power Smallest board implementation possible Low EMI emission Low cost off the shelf components
Features
Built-in Burst Mode Oscillator and Modulator Built-in Precision Burst Mode Dimming Built-in Open/Short Lamp Protection Built-in Dual Mode Fault Timer Built-in Soft-on/Soft-off Burst Mode Automatic Recovery from ESD Event Wide Range 6 to 22V Battery Voltage with Regulated Lamp Current Startup at All Voltages and Temperatures Without Additional Components Integrated 0.10 Power Switches Output Short Circuit Protected No High Voltage Ballast Capacitor
Applications
LCD Backlight Inverter for: Notebook Computers Tablet PCs Desktop Systems
Ordering Information
Part Number MP1016EF MP1016EM Package TSSOP20 with Exposed Paddle TSSOP20 Temperature -20C to +85C -20C to +85C
For Tape & Reel use suffix - Z (e.g. MP1016EM-Z)
Typical Application
Cisb Risb Rs Cft Ccomp Cref CbtR Cp
20 19 18 17 16 15 14 13 12 11
Cs2 Csfb Rlfb
Cs1
Lamp
Rdamp
Lamp
Cbp
Rbosc
w
w
w
.d
sh ta a
ee
DBrt En Gnd Batt
u. t4
Rdbr
om c
BP
1 2
Bosc
DBrt
OutL
Batt
PGnd
MP 1016
3
4
5
6
7
8
9
10
Cbosc
Cdrv CbaL
CbtL
Rbleed Cdbr
Cba
MP1016 Rev 1.5 06/25/04
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VLFB
Comp
ISFB
OutR
Batt
PGnd
AGnd
Ref
Drv
En
IL
BtL
BtR
FT
MP1016
Full System Precision CCFL Driver
Monolithic Power Systems
Absolute Maximum Ratings
Input Voltage (VBatt) 25V Power Dissipation 1.0W Logic Inputs -0.3 to 6.8V 6V IL, ISFB Input Voltages (VIL, VISFB) -0.3 to 12V VLFB Input Voltage (VVLFB) Junction Temperature 150C Lead Temperature (Solder) 260C Operating Frequency 150KHz Storage Temperature -55 to +150C
Recommended Operating Conditions
Input Voltage (VBatt) Digital Brightness Voltage (VDBrt) En Enable Voltage (VEn) Operating Frequency (Typical) Operating Temperature 6 to 22V 0 to 1.8V 0 to 5V 60KHz -20 to +85C JA 90 40 JC 25 C/W 6 C/W
Thermal Characteristics
Thermal Resistance (TSSOP) Thermal Resistance (TSSOPF)
Electrical Characteristics (Unless otherwise specified VBatt=12V, TA=25C)
Parameters Reference Voltage Output Voltage Reference Current Line Regulation Load Regulation Battery Supply Supply Current (disabled) Supply Current (enabled) Shutdown Logic Fault Timer Threshold Fault Timer Sink Current Fault Timer Source Current Open Lamp Secondary Overload Enable Voltage Low Enable Voltage High Output Drivers Switch On Resistance Short Circuit Current Ton(min) Ton(min) Brightness Control Sense Voltage Lamp Current regulation Burst Oscillator Sink Current Burst Oscillator Peak Voltage Digital Brightness Offset Voltage Fault Loop Control Open Lamp Threshold Secondary Current Threshold Fault Mode Comp Current Symbol VRef IRef Condition IRef = 3mA 6V < VBatt < 22V 0 < IRef < 3.0mA IBatt IBatt V(TH)FT VVLFB > 0, VISFB < 1.2V VVLFB = 0, VISFB =1.2V VISFB = 1.2V V(L)En V(H)En R(ON)OutL,OutR ISC (Note 1) VComp= 0V,VBatt = 22V VComp= 0V, VBatt = 6V VIL 7V < VBatt < 22V IBosc VBosc V(OS)DBrt V(TH)VLFB V(TH)ISFB IComp 1.70 -50 360 2.0 0.12 4 435 1750 379 2 380 1.78 5 0 1.2 475 Min 4.75 3.0 Typ 5.0 Max 5.25 30 30 10 2.5 1.3 Units V mA mV mV A mA V A A A V V A ns ns mV % A V mV V V A
6V < VBatt < 22V 1.1
1.6 1.2 1 1 120
0.5
550 2100 400 5 1.86 50
VVLFB < 0V, VISFB > 1.2V
Note 1: This parameter is guaranteed by design. Note 2: It is recommended that power be applied to the MP1016, via the Batt pins (#7 and #14), a minimum of 3ms prior to the Enable pin En (#5) being switched high. DBRT is independent of Power on/off and Enable, therefore the DBRT control signal can be applied before or after the battery and enable signals. MP1016 Rev 1.5 06/25/04 www.monolithicpower.com 2
MP1016
Full System Precision CCFL Driver
Monolithic Power Systems
Pin Description
BP 1 IL 2 Bosc 3 DBrt 4 En 5 Drv 6 Batt 7 OutL 8 PGnd 9 BtL 10 20 19 18 17 16 15 14 13 12 11 AGnd ISFB VLFB FT Comp Ref Batt OutR PGnd BtR
Table 1: Pin Designators
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Pin Name BP IL Bosc DBrt En Drv Batt OutL PGnd BtL BtR PGnd OutR Batt Ref Comp FT VLFB ISFB AGnd Pin Function Bypass Capacitor Lamp Current Feedback Sense Input Burst Oscillator Timing Burst Mode Dimming Chip Enable. Do not float this pin Internally Generated MOSFET Gate Drive Supply Voltage (6V) Power Supply Input Output to Load (tank circuit) Power Ground Regulated Output Voltage for Bootstrap Capacitor on Phase L Regulated Output Voltage for Bootstrap Capacitor on Phase R Power Ground Output to Load (tank circuit) Power Supply Input Internally Generated Reference Voltage Output (5V) Loop Compensation Capacitor Fault Timer Open Lamp Detect (Lamp Voltage Feedback) Shorted Lamp Detect (Secondary Current Feedback) Small Signal Ground
MP1016 Rev 1.5 06/25/04
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MP1016
Full System Precision CCFL Driver
Monolithic Power Systems
Batt Comp IL Internal Regulators Drv 6V Ref 5V OutL OutR
2.5V
S
Q Q
+ R
O
O
75mV + -
S R
Q Q
MUX
FT En DBrt + VLFB + Bosc BYP Control Logic & TSD + T Q Q
ISFB
+ 1.2V -
Figure 1: Functional Block Diagram
Feature Description
Brightness Control
The MP1016 can operate in two modes: Burst Mode with a DC input or Burst Mode with an external PWM. The two modes are dependent on the pin connections as per Table 1. Choosing the required burst repetition frequency can be achieved by an RC combination, as defined in component selection. The MP1016 has a soft on and soft off feature to reduce noise, when using burst mode dimming.
Fault Protection
Open Lamp: The VLFB pin (#18) is used to detect whether an open lamp condition has occurred. During normal operation the VLFB pin is typically at 5V DC with an AC swing of +/- 2V. If an open lamp condition exists then the AC voltage on the VLFB line swings below zero volts. When that occurs, the IC regulates the VLFB voltage to 10V p-p and a 1A current source will inject into the FT pin. If the voltage at the FT pin exceeds 1.2V, then the chip shuts down. Excessive Secondary Current (Shorted Lamp and UL safety specs): The ISFB pin (#19) is used to detect whether excessive secondary current has occurred. During normal operation the ISFB voltage is a 1V p-p AC signal centered at zero volts D.C. If a fault condition occurs that increases the secondary current, the voltage at ISFB increases above 1.2V. When that occurs, the IC regulates the ISFB voltage to 2.4V p-p and a 120A current source injects into the FT pin. If the voltage at the FT pin exceeds 1.2V, the IC shuts down.
Table 2: Function Mode
Function Burst Mode with DC input voltage Burst Mode from external source Pin Connection Pin 4 Pin 3 DBrt Bosc Rbosc 0 - 1.8V Cbosc PWM 1.5V
Brightness Polarity: Burst: 100% duty cycle is at 2V
MP1016 Rev 1.5 06/25/04
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MP1016
Full System Precision CCFL Driver
Monolithic Power Systems
Fault Timer: The timing for the fault timer depends on the sourcing current, as described in the previous section, and the capacitor on the FT pin. This capacitor programs the time for the voltage to rise before the chip detects a "real" fault. When a fault is triggered, then the internal drive voltage (VDrv) will collapse from 6.2V to 0V. The reference voltage will stay high at 5.0V.
Application Information
Pin 19 (ISFB) : Rsfb, Csfb , Risb, Cisb, ( Secondary Short Protection) The Rsfb and Csfb combination is used for feedback to the ISFB pin to detect excessive secondary current. These resistors have to be +/5% tolerance components. The value for Rsfb is 1.7K and for Csfb is 82nF. This ensures that the voltage at the Isfb pin is typically 1.0V during steady state operation. The maximum value for Csfb is 93nF to ensure that the chip will meet the UL1950 specification. Risb and Cisb components form a high pass filter. Pin 18 (VLFB): Cs1, Cs2 and Rs (Open Lamp protection) The regulated open lamp voltage is proportional to ratio of the Cs1 and Cs2 capacitances. Cs1 has to be rated at 3KV and is typically between 5 to 22pF. Choose the value of Cs1, typically 15pF, for a specified maximum frequency. The value of Cs2 is
Lamp Startup
The strike voltage of the lamp is always guaranteed at any temperature because the MP1016 uses a resonant topology for switching the outputs. The device continues to switch at the resonant frequency of the tank until the strike voltage is achieved. This eliminates the need for external ramp timing circuits to ensure startup.
Chip Enable
The chip has an on/off function, which is controlled by the En pin (#5). The En drives a Schmitt trigger. The chip turns ON with En=High and OFF with En=Low. It is recommended that power be applied to the MP1016, via the Batt pins (#7 and #14), a minimum of 3ms prior to the En pin (#5) being switched high.
V
set to achieve the required open lamp voltage detection value, typically 4nF.
Cs2=Cs1 * V(max)rms/ 3.5Vrms)
The value of Rs is typically 12K (not critical). Pin 17 (FT): Cft The Cft cap is used to set the fault timer. This capacitor will determine when the chip reaches the fault threshold value. Choose the capacitor value to set the time out value. Open Lamp Time
Input Voltage
0
t
V
Cft (nF) = T(open lamp) (1A)/ 1.2 V
Enable Voltage
Cft= 820nF, sets the open lamp time-out to 0.98 sec. Pin 16 (Comp): Ccomp The compensation capacitor connects between Comp and VRef and compensates the system. Use a 1.5nf or 2.2nF capacitor. This capacitor should be X7R ceramic dielectric with a voltage rating sufficient for 5V biasing. The value of Ccomp affects the soft-on rise time and soft-off fall time.
5
0 3 ms
t
Figure 2: Input Voltage vs. Enable Sequence
MP1016 Rev 1.5 06/25/04
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MP1016
Full System Precision CCFL Driver
Monolithic Power Systems
Pin 15 (Ref): Cref is the bypass capacitor for the internal 5.0V supply. It must be placed as close as possible to the pin. A maximum of 100 mils is recommended between the capacitor and the IC. The value of the capacitor is typically 0.47F Pin 14, Pin 7 & Pin 9 (Batt & PGnd): CbaR/L, Cba These capacitors are used as the bypass caps for the battery voltage supply line. These capacitors absorb most of the input switching current of the inverter and require adequate ripple rating. Typically the current rating for Cba is > 500mArms. Typically CbaR and CbaL are 1F and Cba is equal to 2 caps of 2.2F. Pin 13 & Pin 8 (OutL, OutR): Cp1, Rdamp, Rbleed The primary transformer current flows through Cp1. Its value is typically 1F and its voltage rating is sufficient for a 5V bias. The capacitor should be ceramic and have a ripple current rating greater than the primary current (typically 0.8Arms). Rdamp and Rbleed ensure that the bridge outputs are at 0V prior to startup. Typically Rbleed = 4.3K and Rdamp = 1K. Pin 11 and Pin 10 (BtL and BtR): Cbtl and Cbtr Cbtl and Cbtr are the reservoir capacitors for the upper switches' gate drive. They should be 10nF, X7R ceramic dielectric and have a voltage rating for 6.6V biasing. Pin 6 (Drv): Cdrv Cdvr bypasses the 6.2V gate supply for the lower switches. Use a 100nF ceramic Y5V or X7R dielectric capacitor. Pin 5 (En): Enable Pin The En pin enables and disables the IC. Do not float the En pin. Pin 4 (DBrt) : Rdbr and Cdbr The DBrt pin controls the burst brightness. The DC voltage on the DBrt pin controls the burst percentage on the output. Filter the signal for optimal operation. The active range is approximately 0.1V to 1.8V. The value of Rdbr and Cdbr is not critical. Pin 3 (Bosc): Cbosc and Rbosc Cbosc and Rbosc sets the burst repetition rate and the minimum Ton. Set Tmin to achieve the minimum required system brightness. Ensure that Tmin is long enough that the lamp does not extinguish. These values are determined by the following steps: 1) Select a Minimum Duty Cycle (DMIN). This is the ratio TFALL / (TFALL + TRISE) for the burst oscillator. For example: 10% 2) Determine Rbosc by the formula: Rbosc = (1.68*(1/DMIN - 1) / 0.42 + 4) / 380e-6 3) Select a burst frequency and find TTOTAL where TTOTAL = 1/burst frequency. Then determine Cbosc by the formula: Cbosc = TTOTAL*(1-DMIN)/(0.42*Rbosc) Where: fbosc= burst frequency rate in Hz Tmin= Minimum burst time in sec Pin 1 & Pin 20: (BP, AGnd) Cbp Place a 0.1F bypass capacitor Cbp between pin 1 (BP) and pin 20 (AGnd).
MP1016 Rev 1.5 06/25/04
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MP1016
Full System Precision CCFL Driver
Monolithic Power Systems
Figure 3: Open_Lamp Voltage Setup and UL Test Protection Application Information
MP1016 Rev 1.5 06/25/04
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MP1016
Full System Precision CCFL Driver
Monolithic Power Systems
Figure 4: Burst Oscillator Waveform versus Output Lamp Current
Packaging Information
TSSOP20 or TSSOP20F (Exposed Paddle **)
0.0256(0.650)TYP 0.004(0.090) 0.010(0.250) GATE PLANE 0.169 0.177 0.244 0.260 0.004(0.090) 0 o-8o 0.018(0.450) 0.030(0.750) 0.039(1.000)REF
PIN 1 IDENT.
0.150(3.80) 0.165(4.19) 0.105 (2.67) 0.118 (3.00)
(4.300) (6.200) (4.500) (6.600)
DETAIL "A"
0.030(0.750)
0.030(0.750)
SEE DETAIL "B"
** EXPOSED PADDLE VERSION ONLY SEE DETAIL "A"
0.252 (6.400) 0.260 (6.600) 0.033(0.850) 0.047(1.200) 0.007(0.190) 0.012(0.300) 0.032(0.800) 0.041(1.050) 0.002(0.050) 0.006(0.150) 0.075(0.190) 0.012(0.300) SEATING PLANE 0.004(0.090) 0.006(0.160) 0.004(0.090) 0.008(0.200)
NOTE: 1) Control dimension is in inches.
0.007(0.190) 0.010(0.250) Dimension in bracket is millimeters.
DETAIL "B"
NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without notice. Please contact the factory for current specifications. No responsibility is assumed by MPS for its use or fit to any application, nor for infringement of patent or other rights of third parties. MP1016 Rev 1.5 06/25/04 (c) 2004 MPS, Inc. Monolithic Power Systems, Inc. 983 University Ave, Building A, Los Gatos, CA 95032 USA Tel: 408-357-6600 Fax: 408-357-6601 Web: www.monolithicpower.com 8
TABLE OF MATERIAL DECLARATION
This table is used for part such as: Leadframe, Die attach material, Gold Wire, Solder, Mold Compound, Coating Material, Marking Ink.
PACKAGE : CUSTOMER : No. 1 Part Name Leadframe 401075
20 TSSOP-LF
Material Name Spot Ag Copper C7025
Component wt (mg) 25.3002
Material Content (Element) Cu Ni Si Mg Ag (B) Silver (70 - 85) Epoxy Resin (5 - 25) Aromatic Amine (1 - 10) Au Ag Cu Fe Mg Ca Be Sn Silica Fused (80 - 95) Epoxy resin (3 - 8) Phenol resin (3 - 8) Antimony trioxide (0.2 - 1.5)
CAS Number 7440-50-8 7440-02-0 7440-21-3 7439-95-4 7440-22-4 7440-22-4 Proprietary Proprietary 7440-57-5 7440-22-4 7440-50-8 7439-89-6 7439-95-4 7440-70-2 7440-41-7 7440-31-5 60676-86-0 1309-64-4
Element Wt (A) (%) 96.2 3 0.65 0.15 77.5 15 5.5 99.99 1 ppm 1ppm 2 ppm 1 ppm 1 ppm 5 ppm 100 87.5 5.5 5.5 0.85
Element Wt (mg) 24.3388 0.7590 0.1645 0.0380 0.6686 0.6140 0.1188 0.0436 0.8929
Wt % Of Total Unit Wt 34.5841 1.0785 0.2337 0.0539 0.9501 0.8725 0.1689 0.0619 1.2688
ppm 345840.87 10785.06 2336.76 539.25 9500.64 8725.07 1688.72 619.20 12688.18 0.013 0.013 0.025 0.013 0.01 0.06 12650.68 482362.33 30319.92 30319.92 4685.81
2
Die attach material
Epoxy Ablebond 84-1 LMISR4 Gold
0.6686 0.7923
3
Gold Wire
0.8930
4 5
Tin Plate Mold Compound
Pure Tin EME7351LS
0.8903 38.7961
0.8903 33.9466 2.1338 2.1338 0.3298
1.2651 48.2362 3.0320 3.0320 0.4686
6
Die Total unit weight =
Silicon Chip
3.0352 70.3757
Note: (A) Element Wt Composition is derived from MSDS and/or material C of C from Vendors (B) Wt of silver spotted on leadframe is estimated. (C) Component Weight is based on assembly of generic parts.

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