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PDF SD42524 Data sheet ( Hoja de datos )
| Número de pieza | SD42524 | |
| Descripción | 1A High Power LED Driver | |
| Fabricantes | Silan | |
| Logotipo |  |
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SD42524
1A High Power LED Driver with 6～36V Input
DESCRIPTION
The SD42524 is a step-down PWM control LED driver with a built-in
power MOSFET. It achieves 1A continuous output current in 6~36V
input voltage range. It provides thermal shutdown circuit, current limit
circuit and PWM dimming circuit.
The SD42524 adopts current mode control which provides fast
transient response and simple loop stabilization design. It has high
efficiency up to more than 96%, and has excellent constant current
characteristic when the input/output voltage changed, with the
excellent current accuracy within ±1%
FEATURES
* 6-36V input voltage range
* Maximum 1A output current
* 0.40Ω built-in power MOSFET
* Integrate Jitter function
* Thermal compensation
* PWM dimming function
* 280kHz fixed frequency
* Excellent constant current accuracy ±1%
* High efficiency up to 96%
* Thermal shutdown
* Cycle-by-cycle over current protection
APPLICATIONS
* MR16 LED spotlight
* LED illuminance
* LED street lamp
ORDERING INFORMATION
Part No.
SD42524
Package
SOP-8-225-1.27
Marking
SD42524
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1 2009.06.26
Page 1 of 11
1 page  
www.DataSheet4U.com
5. Thermal compensation and linear dimming function
SD42524
SD42524 has linear dimming and thermal compensation functions.
Linear dimming function: Set the output current by adjust the ratio of R1 and R2. The relation between voltage
on pin ADJ and output current Iout is shown below:
VA DJ
≥ 1.22V
,
Iout
=
0.088
Rs
0.1V < VADJ < 1.22V ,
Iout
=
0.088
Rs
×
VADJ
1.22
Thermal compensation function: the application circuit is shown above, use NTC resistor to take place of R2 for
thermal compensation. In normal temperature, the voltage on R2 is higher than 1.22V, and 100% current is
delivered to output; when LED temperature detected by R2 is higher than the setting value Tth, the voltage on
R2 is lower than 1.22V, and output current will decrease following the rising temperature. Connect NTC R2 with
other resistor in series to get different LED falling curves under different current.
If thermal compensation and linear dimming are not used, connect ADJ to VDD.
The relation between LED output current and temperature
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1 2009.06.26
Page 5 of 11
5 Page 
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Attachment
Revision History
Data
2009.05.19
2009.06.26
REV
1.0
1.1
Description
Original
Modify the “FUNCTION DESCRIPTION”
SD42524
Page
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1 2009.06.26
Page 11 of 11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SD42524.PDF ] | |
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