LED DRIVER. SD42511 Datasheet

SD42511 DRIVER. Datasheet pdf. Equivalent

Part SD42511
Description 1A WHITE LED DRIVER
Feature www.DataSheet4U.com SD42511 1A WHITE LED DRIVER WITH PWM DIMMING CONTROLLER DESCRIPTION The SD4251.
Manufacture Silan
Datasheet
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SD42511
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SD42511
1A WHITE LED DRIVER WITH PWM DIMMING CONTROLLER
DESCRIPTION
The SD42511 is a step-down PWM control LED driver with a built-in
internal power MOSFET. It achieves 1A continuous output current over
a wide input supply range. It provides thermal shutdown circuit, current
limiting circuit and PWM dimming circuit.
SD42511 adopts current mode control. Current mode operation
provides fast transient response and simple loop stabilization design.
SD42511 has high efficiency up to more than 90%, and has excellent
constant current characteristic when the input/output voltage changed,
with the excellent current accuracy within ±1%. With the high input
voltage of up to 25V and built-in slope compensation, it can drive 6
LEDs.
FEATURES
* Maximum 1A output current
* 0.25Ω built-in power MOSFET
* PWM dimming function
* 280KHz fixed frequency
* Excellent constant current accuracy ±1%
* High efficiency up to 90%
* Thermal shutdown
* Cycle-by-cycle over current protection
* 6-25V input voltage range
* Drive LED string
ORDERING INFORMATION
Device
SD42511
Package
SOP-8-225-1.27
APPLICATIONS
* Power LED driver
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2008.03.13
Page 1 of 9



SD42511
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SD42511
ABSOLUTE MAXIMUM RATING
Characteristics
Supply Voltage
Switch Voltage
Boost Voltage
Feedback Voltage
PWM Voltage
Comp Voltage
LED Voltage
Junction Temperature
Lead Temperature
Storage Temperature
Input Voltage
Operating Temperature
Symbol
VIN
VSW
VBS
VFB
VPWM
VCOMP
VLED
Tj
TL
TSTG
VIN
TOPR
Ratings
28
-1~VIN+1
VSW+6
-0.3~VIN
-0.3~6
-0.3~6
-0.3~VIN
150
260
-65~150
5~25
-40~125
Unit
V
V
V
V
V
V
V
°C
°C
°C
V
°C
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, VIN=12V, Tamb=25°C)
Characteristics
Operating Current
Upper Switch Leakage
Current Limit
Maximum Duty Cycle
Oscillator Frequency
PWM Dimming Threshold
Voltage
PWM pull-down current
PWM pull-up current
COMP Clamp Voltage
Switch Transistor on Resistance
Symbol
IIN
IL
ILIM
Dmax
fosc
VPWMTH
IPWM1
IPWM1
VCOMP
RONH
Test Condition
VFB3.5V
VSW=0V
VFB=0V
VPWM=5V
VPWM=0V
Open without load
Min.
1.3
--
250
1.2
1.9
--
Typ.
2.0
0
1.6
93
280
1.5
50
60
2.2
0.25
Max.
2.3
10
2.0
--
310
1.8
60
70
2.5
--
Unit
mA
μA
A
%
kHz
V
μA
μA
V
Ω
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2008.03.13
Page 2 of 9







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