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SSL1623PH
SMPS ICs for mains LED drivers
Rev. 01 -- 15 September 2008 Product data sheet
1. General description
The SSL1623PH is a Switched Mode Power Supply (SMPS) controller IC that operates directly from the rectified universal mains. It is implemented in the high voltage EZ-HV SOI (Easy High Voltage Silicon-On-Insulator) process, combined with a low voltage BiCMOS (Bipolar Complementary Metal Oxide Semiconductor) process. The device includes a high voltage power switch and a circuit for start-up directly from the rectified mains voltage. A dedicated circuit for valley switching is built in, which makes a very efficient slim-line electronic LED driver concept possible. The SSL1623PH can operate in LED applications with a power range of up to 25 W. The SSL152x family would be a better choice if power below 15 W is required. In its most basic version of application the SSL1623PH acts as a voltage source. Here no additional secondary electronics are required. A combined voltage and current source can be realized with minimum costs for external components. Implementation of the SSL1623PH renders an efficient and low cost LED power supply system.
2. Features
I I I I I I I I I I I I Integrated power switch: 6.5 and 650 V Operates from universal AC mains supplies, 80 V to 276 V Adjustable frequency for flexible design RC oscillator for load insensitive regulation loop constant Valley switching for minimum switch-on loss Adjustable overcurrent protection Undervoltage protection Temperature protection Short circuit winding protection Safe restart mode for system fault conditions Simple application with both primary and secondary (opto) feedback Available in 16-pin DIP package
3. Applications
I I I I I LED ballasts Contour lighting LED spotlights Channel letter lighting Down lighting
NXP Semiconductors
SSL1623PH
I Commercial lighting (e.g. retail displays)
4. Quick reference data
Table 1. Symbol VCC VDRAIN IDRAIN RDSon Quick reference data Parameter supply voltage voltage on pin DRAIN current on pin DRAIN drain-source on-state resistance no auxiliary supply Isource = -0.5 A Tj = 25 C Tj = 100 C fosc Tamb
[1]
Conditions continuous
[1]
Min -0.4 -0.4 10 -20
Typ 0.5 6.5 9.0 -
Max +40 +650 7.5 10.0 200 +85
Unit V V mA kHz C
oscillator frequency ambient temperature
Pins VCC and RC are not allowed to be current driven.
5. Ordering information
Table 2. Ordering information Package Name SSL1623PH DIP16 Description plastic dual in-line package; 16 leads (300 mil); long body Version SOT38-1 Type number
SSL1623PH_1
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6. Block diagram
VCC
3
SUPPLY
14
DRAIN
VALLEY
SSL1623PH
1, 2, 7, 9, 10, 13, 15, 16
n.c.
GND
4
LOGIC
100 mV
stop 5
RC
OSCILLATOR
THERMAL SHUTDOWN PROTECTION LOGIC POWER-UP RESET
12
SOURCE
low freq
f 1.8 U
blank
overcurrent 6 REG short winding SGND 8
0.75 V 2.5 V 10x 0.5 V
11
AUX
014aaa566
Fig 1.
Block diagram of SSL1623PH
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7. Pinning information
7.1 Pinning
n.c. n.c. VCC GND RC REG n.c. SGND
1 2 3 4
16 n.c. 15 n.c. 14 DRAIN 13 n.c.
SSL1623PH
5 6 7 8
014aaa345
12 SOURCE 11 AUX 10 n.c. 9 n.c.
Fig 2.
Pin configuration
7.2 Pin description
Table 3. Symbol VCC GND RC REG SGND AUX SOURCE n.c. DRAIN Pin description Pin 3 4 5 6 8 11 12 1, 2, 7, 9, 10, 13, 15, 16. 14 Description supply voltage ground frequency setting regulation input signal ground; must preferably be connected to pin GND input for voltage from auxiliary winding for timing (demagnetization) source of internal MOS switch not connected drain of internal MOS switch; input for start-up current and valley sensing
8. Functional description
The SSL1623PH is the heart of a compact flyback converter, with the IC placed at the primary side. The auxiliary winding of the transformer can be used for indirect feedback to control the isolated output. This additional winding also powers the IC. A more accurate control of the output voltage and/or current can be implemented with an additional secondary sensing circuit and opto coupler feedback. The SSL1623PH can be used in a constant power mode or in a constant current mode to drive LEDs. The SSL1623PH uses voltage mode control. The frequency is determined by the maximum transformer demagnetizing time and the time of the oscillator. In the first case, the converter operates in the Self Oscillating Power Supply (SOPS) mode. In the latter
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case, it operates at a constant frequency, which can be adjusted with external components RRC and CRC. Furthermore, a primary stroke is started only in a valley of the secondary ringing. This valley switching principle minimizes capacitive switch-on losses.
8.1 Start-up and undervoltage lockout
Initially, the IC is self-supplying from the rectified mains voltage. The IC starts switching as soon as the voltage on pin VCC passes the VCC(startup) level. The supply is taken over by the auxiliary winding of the transformer as soon as VCC is high enough and the supply from the line is stopped for high efficiency operation. As soon as the voltage on pin VCC drops below the VCC(stop) level, the IC stops switching and restarts from the rectified mains voltage.
8.2 Oscillator
The frequency of the oscillator is set by the external resistor and capacitor on pin RC. The external capacitor is charged rapidly to the VRC(max) level and, starting from a new primary stroke, it discharges to the VRC(min) level. Because the discharge is exponential, the relative sensitivity of the duty factor to the regulation voltage at low duty factor is almost equal to the sensitivity at high duty factors. This results in a more constant gain over the duty factor range compared to systems with a linear sawtooth oscillator. Stable operation at low duty factors is easily realized. For high efficiency, the frequency is reduced as soon as the duty factor drops below a certain value. This is accomplished by increasing the oscillator charge time. To ensure that the capacitor can be charged within the charge time, the value of the oscillator capacitor should be limited to approximately 1 nF.
8.3 Duty factor control
The duty factor is controlled by the internal regulation voltage and the oscillator signal on pin RC. The internal regulation voltage is equal to the external regulation voltage (minus 2.5 V) multiplied by the gain of the error amplifier (typical 20 dB). The minimum duty factor of the switched mode power supply is 0 %. The maximum duty factor is set to 75 % (typical value at 100 kHz oscillation frequency).
8.4 Valley switching
A new cycle is started at the primary stroke when the switch is switched on (see Figure 3). After a certain time (determined by the RC oscillator voltage and the internal regulation level), the switch is turned off and the secondary stroke starts. The internal regulation level is determined by the voltage on pin REG. After the secondary stroke, the DRAIN voltage shows an oscillation with a frequency of approximately, see Equation 1. 1 ----------------------------2 x L p C p Where: Lp is the primary self-inductance on the drain node. Cp is the parasitic capacitance on the drain node.
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Product data sheet
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SSL1623PH
As soon as the oscillator voltage is high again and the secondary stroke has ended, the circuit waits for a low drain voltage before starting a new primary stroke. The primary stroke starts some time before the actual valley at low ringing frequencies, and some time after the actual valley at high ringing frequencies. Figure 4 shows a typical curve for a reflected voltage N x Vo of 80 V. This voltage is the output voltage Vo (see Figure 5) transferred to the primary side of the transformer with the factor N (determined by the turns ratio of the transformer). Figure 4 shows that the system switches exactly at minimum drain voltage for ringing frequencies of 480 kHz, thus reducing the switch-on losses to a minimum. At 200 kHz, the next primary stroke is started at 33 before the valley. The switch-on losses are still reduced significantly.
primary stroke
secondary stroke
secondary ringing
drain
valley
secondary stroke A RC oscillator regulation level B
col007
A: Start of new cycle with valley switching. B: Start of new cycle in a classical system.
Fig 3.
Signals for valley switching
SSL1623PH_1
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Product data sheet
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SSL1623PH
40 phase () 20
001aaa311
0
-20
-40 0 200 400 600 f (kHz) 800
Reflected voltage at N x Vo = 80 V.
Fig 4.
Typical phase of drain ringing at switch-on
8.5 Demagnetization
The system operates in discontinuous conduction mode all the time. As long as the secondary stroke has not ended, the oscillator will not start a new primary stroke. During the suppression time tsup(xfmr_ring), demagnetization recognition is suppressed. This suppression may be necessary in applications where the transformer has a large leakage inductance and at low output voltages.
8.6 Protections
8.6.1 Overcurrent protection
The cycle-by-cycle peak drain current limit circuit uses the external source resistor RI (see Figure 5) to measure the current. The circuit is activated after the leading edge blanking time tleb. The protection circuit limits the source voltage to VSOURCE(max) and thus limits the primary peak current.
8.6.2 Short winding protection
The short winding protection circuit is also activated after the leading edge blanking time. If the source voltage exceeds the short winding protection voltage Vswp, the SSL1623PH stops switching. Only a power-on reset will restart normal operation. The short winding protection also protects in case of a secondary diode short circuit.
8.6.3 Overtemperature protection
An accurate temperature protection is provided in the SSL1623PH. When the junction temperature exceeds the thermal shutdown temperature, the IC stops switching. During thermal protection the IC current is lowered to the start-up current. The IC continues normal operation as soon as the overtemperature situation has disappeared.
SSL1623PH_1
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Product data sheet
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SSL1623PH
8.6.4 Overvoltage protection
Overvoltage protection can be achieved in the application by pulling pin REG above its normal operation level or by keeping the level of pin AUX above Vdet(demag). The current primary stroke is terminated immediately and no new primary stroke is started until the voltage on pin REG drops to its normal operation level. Pin REG has an internal clamp. The current feed into pin REG must be limited.
8.7 Characteristics of the complete LED power supply
8.7.1 Input
The input voltage range comprises the universal AC mains from 80 V to 276 V.
8.7.2 Accuracy
The accuracy of the complete converter, functioning as a voltage source with primary sensing, is approximately 8 % (mainly dependent on the transformer coupling). The accuracy with secondary sensing is defined by the accuracy of the external components. For safety requirements in case of opto coupler feedback loss, the primary sensing remains active when an overvoltage circuit is connected.
8.7.3 Efficiency
An efficiency of over 80 % at maximum output power can be achieved for a complete converter designed for universal mains.
8.7.4 Ripple
A minimum ripple is obtained in a system designed for a maximum duty factor of 50 % under normal operating conditions and a minimized dead time. The magnitude of the ripple in the output voltage is determined by the frequency and duty factor of the converter, the output current level, and the value and ESR of the output capacitor.
9. Limiting values
Table 4. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Voltages VCC VRC VSOURCE VDRAIN Currents IREG IAUX Ich Isource IDRAIN current on pin REG current on pin AUX charge current source current current on pin DRAIN oscillator capacitor
[2] [2]
Parameter supply voltage voltage on pin RC voltage on pin source voltage on pin DRAIN
Conditions continuous
[1] [1]
Min -0.4 -0.4 -0.4 -0.4 -10 -3 -2 -2
Max +40 +3 +5 +650 6 +5 +2 +2
Unit V V V V mA mA mA A A
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Product data sheet
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Table 4. Limiting values ...continued In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol General Ptot Tstg Tamb Tj Vesd total power dissipation storage temperature ambient temperature junction temperature electrostatic discharge voltage human body model pin DRAIN all other pins machine model all pins
[1] [2] [3] [4] Pins VCC and RC are not allowed to be current driven. Pins REG and AUX are not allowed to be voltage driven. Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 k series resistor. Machine model: equivalent to discharging a 200 pF capacitor through a 0.75 H coil and a 10 series resistor.
[4] [3]
Parameter
Conditions Tamb < 50 C
Min -55 -20 -20 -1500 -2000 -200
Max 1.7 +150 +85 +145 +1500 +2000 +200
Unit W C C C V V V
10. Thermal characteristics
Table 5. Symbol Rth(j-a)
[1]
Thermal characteristics Parameter thermal resistance from junction to ambient Conditions in free air
[1]
Typ 55
Unit K/W
Thermal resistance Rth(j-a) can be lower when pin GND is connected to sufficient copper area on the printed-circuit board.
11. Characteristics
Table 6. Characteristics Measurement valid data Tamb = 25 C; no overtemperature; all voltages are measured with respect to ground; currents are positive when flowing into the IC; unless otherwise specified. Symbol Supplies Supply on pin VCC VCC(startup) VCC(stop) ICC(oper) ICC(startup) Ich start-up supply voltage stop supply voltage operating supply current start-up supply current charge current undervoltage lockout normal operation start-up VDRAIN > 60 V VCC = 0 V VCC = 8.5 V -650 -375 -520 -275 -390 -175 A A 9 7.0 9.5 7.5 1.3 180 10 8.0 1.9 400 V V mA A Parameter Conditions Min Typ Max Unit
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Table 6. Characteristics ...continued Measurement valid data Tamb = 25 C; no overtemperature; all voltages are measured with respect to ground; currents are positive when flowing into the IC; unless otherwise specified. Symbol IDRAIN Parameter current on pin DRAIN Conditions no auxiliary supply with auxiliary supply; VDRAIN > 60 V Pulse width modulator mode min max Vdet(demag) tsup(xfmr_ring) VRC(min) VRC(max) tch fosc VREG Gv Vclamp(REG) (V/t)vrec fring td(vrec-swon) minimum duty factor maximum duty cycle demagnetization detection voltage transformer ringing suppression time minimum voltage on pin RC maximum voltage on pin RC charging time oscillator frequency voltage on pin REG voltage gain clamp voltage on pin REG valley recognition voltage change with time ringing frequency valley recognition to switch-on delay time leakage current on pin DRAIN breakdown voltage on pin DRAIN drain-source on-state resistance VDRAIN = 650 V Tj > 0 C Isource = -0.5 A Tj = 25 C Tj = 100 C tf(DRAIN) fall time on pin DRAIN VDRAIN = 300 V; no external capacitor at pin DRAIN 6.5 9.0 75 7.5 10.0 ns N x Vo = 100 V IREG = 6 mA fosc = 100 kHz 50 1.0 60 2.4 10 2.4 -102 200 0 75 100 1.5 75 2.5 1 2.5 20 550 150 150 2.0 90 2.6 200 2.6 7.5 +102 800 % % mV s mV V s kHz V dB V V/s kHz ns Min Typ 0.5 30 Max 125 Unit mA A Supply on pin DRAIN
Self oscillating power supply mode
Oscillator: pin RC
Duty factor regulator: pin REG
Valley switching recognition
Output stage (FET) IL(DRAIN) VBR(DRAIN) RDSon 650 125 A V
Temperature protection Tprot Tprot(hys) protection temperature hysteresis of protection temperature V/t = 0.1 V/s 150 0.47 160 2 0.50 170 0.53 C C V
Overcurrent and short winding protection: pin SOURCE VSOURCE(max) maximum voltage on pin SOURCE
SSL1623PH_1
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Product data sheet
Rev. 01 -- 15 September 2008
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SSL1623PH
Table 6. Characteristics ...continued Measurement valid data Tamb = 25 C; no overtemperature; all voltages are measured with respect to ground; currents are positive when flowing into the IC; unless otherwise specified. Symbol Vswp td tleb Parameter short-winding protection voltage delay time leading edge blanking time Conditions V/t = 0.5 V/s V/t = 0.5 V/s both overcurrent and short winding protection Min 0.7 250 Typ 0.75 160 350 Max 0.8 185 450 Unit V ns ns
12. Application information
LF D5 Z1 CF1 CF2 D1 C5
Vo
mains
R1 R2 D2
CVCC
VCC GND
1 2 3 4
8 7 6 5
DRAIN n.c. SOURCE AUX
RI RAUX
C6 - Ycap
RRC
RC
R4 CRC R3
SSL1623PH
REG
014aaa347
Fig 5.
Typical configuration of SSL1623PH - primary sensing
SSL1623PH_1
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Product data sheet
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13. Package outline
DIP16: plastic dual in-line package; 16 leads (300 mil); long body SOT38-1
D seating plane
ME
A2
A
L
A1
c Z e b1 b 16 9 MH wM (e 1)
pin 1 index E
1
8
0
5 scale
10 mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT mm inches A max. 4.7 0.19 A1 min. 0.51 0.02 A2 max. 3.7 0.15 b 1.40 1.14 0.055 0.045 b1 0.53 0.38 0.021 0.015 c 0.32 0.23 0.013 0.009 D (1) 21.8 21.4 0.86 0.84 E (1) 6.48 6.20 0.26 0.24 e 2.54 0.1 e1 7.62 0.3 L 3.9 3.4 0.15 0.13 ME 8.25 7.80 0.32 0.31 MH 9.5 8.3 0.37 0.33 w 0.254 0.01 Z (1) max. 2.2 0.087
Note 1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. OUTLINE VERSION SOT38-1 REFERENCES IEC 050G09 JEDEC MO-001 JEITA SC-503-16 EUROPEAN PROJECTION
ISSUE DATE 99-12-27 03-02-13
Fig 6.
SSL1623PH_1
Package outline DIP16
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14. Revision history
Table 7. Revision history Release date 20080915 Data sheet status Product data sheet Change notice Order number Supersedes Document ID SSL1623PH_1
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15. Legal information
15.1 Data sheet status
Document status[1][2] Objective [short] data sheet Preliminary [short] data sheet Product [short] data sheet
[1] [2] [3]
Product status[3] Development Qualification Production
Definition This document contains data from the objective specification for product development. This document contains data from the preliminary specification. This document contains the product specification.
Please consult the most recently issued document before initiating or completing a design. The term `short data sheet' is explained in section "Definitions". The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status information is available on the Internet at URL http://www.nxp.com.
15.2 Definitions
Draft -- The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications or additions. NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. Short data sheet -- A short data sheet is an extract from a full data sheet with the same product type number(s) and title. A short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. For detailed and full information see the relevant full data sheet, which is available on request via the local NXP Semiconductors sales office. In case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail.
damage. NXP Semiconductors accepts no liability for inclusion and/or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer's own risk. Applications -- Applications that are described herein for any of these products are for illustrative purposes only. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Quick reference data -- The Quick reference data is an extract of the product data given in the Limiting values and Characteristics sections of this document, and as such is not complete, exhaustive or legally binding. Limiting values -- Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) may cause permanent damage to the device. Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the Characteristics sections of this document is not implied. Exposure to limiting values for extended periods may affect device reliability. Terms and conditions of sale -- NXP Semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms, including those pertaining to warranty, intellectual property rights infringement and limitation of liability, unless explicitly otherwise agreed to in writing by NXP Semiconductors. In case of any inconsistency or conflict between information in this document and such terms and conditions, the latter will prevail. No offer to sell or license -- Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights.
15.3 Disclaimers
General -- Information in this document is believed to be accurate and reliable. However, NXP Semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. Right to make changes -- NXP Semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof. Suitability for use -- NXP Semiconductors products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental
15.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners.
16. Contact information
For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com
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Product data sheet
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17. Contents
1 2 3 4 5 6 7 7.1 7.2 8 8.1 8.2 8.3 8.4 8.5 8.6 8.6.1 8.6.2 8.6.3 8.6.4 8.7 8.7.1 8.7.2 8.7.3 8.7.4 9 10 11 12 13 14 15 15.1 15.2 15.3 15.4 16 17 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Quick reference data . . . . . . . . . . . . . . . . . . . . . 2 Ordering information . . . . . . . . . . . . . . . . . . . . . 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pinning information . . . . . . . . . . . . . . . . . . . . . . 4 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4 Functional description . . . . . . . . . . . . . . . . . . . 4 Start-up and undervoltage lockout . . . . . . . . . . 5 Oscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Duty factor control. . . . . . . . . . . . . . . . . . . . . . . 5 Valley switching. . . . . . . . . . . . . . . . . . . . . . . . . 5 Demagnetization. . . . . . . . . . . . . . . . . . . . . . . . 7 Protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Overcurrent protection . . . . . . . . . . . . . . . . . . . 7 Short winding protection . . . . . . . . . . . . . . . . . . 7 Overtemperature protection . . . . . . . . . . . . . . . 7 Overvoltage protection . . . . . . . . . . . . . . . . . . . 8 Characteristics of the complete LED power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 8 Thermal characteristics. . . . . . . . . . . . . . . . . . . 9 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Application information. . . . . . . . . . . . . . . . . . 11 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . 13 Legal information. . . . . . . . . . . . . . . . . . . . . . . 14 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 14 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Contact information. . . . . . . . . . . . . . . . . . . . . 14 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Please be aware that important notices concerning this document and the product(s) described herein, have been included in section `Legal information'.
(c) NXP B.V. 2008.
All rights reserved.
For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com Date of release: 15 September 2008 Document identifier: SSL1623PH_1

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