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PDF SD42522 Data sheet ( Hoja de datos )
| Número de pieza | SD42522 | |
| Descripción | 1A High Power LED Driver | |
| Fabricantes | Silan | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SD42522 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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1A High Power LED Driver with 6～36V Input
DESCRIPTION
The SD42522 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.
The SD42522 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
* 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.
www.DataSheet4U.com
SD42522
SD42522TR
Package
SOP-8-225-1.27
SOP-8-225-1.27
Marking
SD42522
SD42522
Material
Pb free
Pb free
Package Type
Tube
Tape & Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2009.07.06
Page 1 of 8
1 page  
COMPONENTS SELECTION
1. Input Capacitor Selection
The input capacitor provides the pulse current when the power MOSFET is on, and charge the capacitor when
the power MOSFET is off, thus to keep the stability of the input voltage. The input capacitor is recommended to
be more than 10μF, which can reduce the peak current drawn from input source and the switch noise. The input
capacitor should be near to the input pin in real routing.
2. Output Capacitance Selection
Parallel connecting a capacitor between the two ends of LED can reduce the output voltage ripple accordingly
reduce the ripple current of LED, while this capacitor will not effect the operating frequency and efficiency, but the
start time will be longer by reducing the rising speed of the voltage on LED. The larger the output capacitor is, the
smaller the current ripple on LED is. It is recommend use the capacitor of 2.2μF or larger.
3. Inductance Selection
The inductance is used to keep the output current constant, the bigger the inductance is, the smaller the output
current ripple is; while the bigger the physical size is, the bigger the series-wound resistor is. The selected
effective current (RMS current rating)of inductance current should be bigger than the maximum output current,
and the saturation current should be 30% bigger than maximum output current. In order to improve the efficiency,
the series-wound resistor (DCR) of inductance should be smaller than 0.2Ω.
The relation between inductance and ripple:
L
=
VOUT
*
VIN − VOUT
VIN * f * ΔI
Where: L: Inductance value
F: Oscillator frequency
ΔI is ripple current
www.DataShWeehte4nU.sceomlect inductance, you should consider the combination of various factors to select suitable inductance.
4. Diode Selection
SD42522 is a non-synchronous step-down adjuster, so the diode should provide continuous current when the
power MOSFET is off. Because the forward voltage of Schottky diode is small, and the reverse continuous
current time is short, so it is usually used for continuous current. During the power MOSFET is conducting, the
diode will withstand high voltage, so the reverse voltage of selected diode should be bigger than the input voltage.
The average current through the diode is ID:
ID = (1− D) * ILED
ILED is the current of LED
When the input voltage is high with a small duty, ID increases, so the selected maximum continuous current
diode should be bigger than the output current.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2009.07.06
Page 5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SD42522.PDF ] | |
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