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Silan Microelectronics

SD42525ETR Datasheet Preview

SD42525ETR Datasheet

HIGH-EFFICIENCY HYSTERESIS LED DRIVER

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SD42525_Datasheet
32V/1A, HIGH-EFFICIENCY HYSTERESIS LED DRIVER WITH BUILT-IN
MOSFET
DESCRIPTION
SD42525 is a step-down constant current converter with
inductance current continuous-conduction mode, it is used for
driving LED or LEDs in series. The output current is adjustable
which is up to 1A in 6~32V input voltage range. LED whose
power is tens of watts can be driven by SD42525 with different
input voltages and peripheral elements. With built-in power
switch, average current of LED can be set through external
high-side current sensing. Analog dimming and wide range
PWM dimming are available through pin DIM and soft-start time
can be set by capacitor value which is connected between pin
DIM and ground.
It adopts two patent technologies: output current compensation
when input voltage varies and current limiting through
maximum duty factor when difference between input/output APPLICATIONS
voltages is small.
For SD42525, package of SOP-8-225, SOT-23-6L and SOT-
89-5L (no dimming) are available.
* Low-voltage LED spotlight, replacing
Halogen lamp
* Car-mounted LED lamp
FEATURES
* LED backup lamp
* LED signal lamp
* Few peripheral elements
* Built-in 36V power MOSFET
* Wide input voltage range: 6V~32V
* Maximum 1A output current
* Excellent output current accuracy: ±3%
* Multiplex pin DIM is used for chip switch, analog dimming
and PWM dimming.
* Soft start function
* LED open/short-circuit protection
* High efficiency up to 96%
* Output constant current which is adjustable
ORDERING INFORMATION
Part No.
SD42525
SD42525TR
SD42525ETR
SD42525KTR
Package
SOP-8-225-1.27
SOP-8-225-1.27
SOT-89-5L
SOT-23-6L
Marking
SD42525
SD42525
525E
525K
Material
Pb free
Pb free
Pb free
Pb free
Packing
Tube
Tape & Reel
Tape & Reel
Tape & Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2010.12.13
Page 1 of 12




Silan Microelectronics

SD42525ETR Datasheet Preview

SD42525ETR Datasheet

HIGH-EFFICIENCY HYSTERESIS LED DRIVER

No Preview Available !

BLOCK DIAGRAM
SD42525_Datasheet
ABSOLUTE MAXIMUM RATING (Tamb=25°C)
Characteristics
Supply Voltage
Switch Voltage
DIM voltage
SENSE voltage
Junction Temperature
Lead Temperature
Operating Temperature Range
Storage Temperature Range
Symbol
VIN
VSW
VDIM
VSENSE
Tj
TL
TOPR
TSTG
Ratings
-0.3 ~ +40
-1~VIN+1
-0.3 ~ +100
-0.3~VIN
150
260
-40~+85
-40~+125
Unit
V
V
V
V
°C
°C
°C
°C
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, VIN=12V, IOUT=700mA, Tamb=25°C)
Characteristics
Supply Voltage
Operating Current
Maximum
operating
frequency
Maximum Duty Cycle
Current sensing
Average sense voltage
Sense voltage hysteresis
Power MOSFET
Leakage current of power
MOSFET
Symbol
VIN
IIN
fosc
Dmax
VIN-VSENSE
VSENSE-hys
IL
Test Condition
VIN=6/40V, VDIM=6V
3LED, VIN=9.5V
12V input; 1 LED
VSW=36V
Min.
6
0.3
--
Typ.
0.5
96
Max.
32
0.8
800
96
Unit
V
mA
kHz
%
97 100 103 mV
±15 %
2 10 μA
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2010.12.13
Page 2 of 12


Part Number SD42525ETR
Description HIGH-EFFICIENCY HYSTERESIS LED DRIVER
Maker Silan Microelectronics
Total Page 12 Pages
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