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2022-09-24 13:04:29
CR Auto Lamp Solution Strobe Application Solution Chip-PT4125 Controlling Current by Adjusting External Current Sampling Resistor
I. Main overview
PT4125 is a high-efficiency, high-precision switching step-down high-power
LED constant current drive control chip.
The PT4125 adopts a flat fixed frequency average current control mode with
Excellent load regulation and line regulation.
PT4125 can control large power by adjusting the external current sampling resistor.
The driving current of the LED lamp can be adjusted to make the brightness of the LED lamp reach the expected constant brightness.
PT4125 supports linear dimming, which can be dimmed through the CS terminal.
PT4125 integrates high and low brightness function, can select high brightness or low brightness through HL pin
light working mode.
PT4125 integrates VDD voltage regulator circuit and over-temperature protection circuit,
Reduced peripheral components and improved system reliability.
The PT4125 is packaged in SOT23-6.
Second, the main features
*_Wide input voltage range: 8V~150V
*_High efficiency: up to 93% support high and low brightness mode
*_Support linear dimming
*_CS voltage: 200mV
*_Fixed working frequency: 140KHz
*_Chip supply under-voltage protection (UVLO)
*_Over temperature automatic current adjustment function
*_Using SOT23-6 package three, application
*_LED car headlights
*_Bicycle, electric vehicle, motorcycle light
*_Flashlight
*_LED spotlight
*_High power LED lighting
*_LED backlight