6-30V LED Drive, PT4115, PWM Tuning View larger

6-30V LED Drive, PT4115, PWM Tuning


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LEDs need constant current, for example normal LED has 350mA constant current, but 3.0-3.6V varying voltage, this board do this kind of work.

IC Features:

  • Simple few peripheral parts
  • Wide input voltage range: 6V to 30V
  • Up to 1.2A output current,
  • Single pin on/off and brightness control using DC voltage or PWM
  • Up to 1MHz switching frequency
  • Typical 5% output current accuracy
  • Inherent open-circuit LED protection
  • High efficiency (up to 97%)

Current setup: LED current is set through a sense resistor. The output current I is equal to 0.1/Rs. If want ~300mA, chose a 0.33 ohm resistor. If you want 350mA, choose a 0.27ohm resistor.


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