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SD42351ND Datasheet(PDF) 3 Page - Silan Microelectronics Joint-stock |
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SD42351ND Datasheet(HTML) 3 Page - Silan Microelectronics Joint-stock |
3 / 4 page SD42351 PIN CONFIGURATION PIN DESCRIPTION Pin No. Pin Name I/O Pin Description 1 VOUT O LED Current Output. 2 GND -- Ground . 3 VDD I Power Supply. FUNCTION DESCRIPTION The SD42351 is a low dropout current regulator rated for constant LED sink current. The low quiescent current and low dropout voltage is achieved by advanced Bi-CMOS process. Its main function is to stabilize the current passing, other than the LED voltage. Traditional LED drivers are Voltage regulator IC, which will affect the brightness because of different forward voltages, although the LEDs are in the same structure. SD42351 controls the brightness of the LED by controlling the current passing by the LED, which eliminates the limitation of traditional voltage regulator IC. The device consists of Voltage Reference, Error Amplifier, Power NMOS, Current Sense Resistance, LOGIC Enable and Over Temperature Protection Circuit. The resistance senses the output current and transform to the voltage, which compared with the reference voltage. The error is amplified, controls the Power NMOS, so that the output current is regulated. Inrush current (over 1 A) in traditional LED drivers is eliminated by the initial current limit circuit, thus constant sink current in the LED is maintained. TYPICAL APPLICATION CIRCUIT Note:The circuit and parameters are reference only, please set the parameters of the real application circuit based on the real test . HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.5 2008.03.13 Http: //www.silan.com.cn Page 3 of 5 |
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