6-30V LED Drive, PT4115, PWM Tuning

Description

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.