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- Application Note : DCDC Converters (Switching Regulators)
- LED High-speed Dimming Control
Application Note : DCDC Converters (Switching Regulators)
LED High-speed Dimming Control
The LED brightness is set by the current through the LEDs, it can be controlled by the Duty of a PWM signal applied to the CE pin.
The current through the LEDs can be calculated by the following formula.
ILED = Hduty × VFB / R1
Following product with high-speed dimming control can be used in the PWM signal range between 200 Hz to 300 kHz.
When controlling the LED brightness with a PWM signal of 20 kHz or less; The variation of the inductor current might cause audible sounds, please use a PWM signal in the high frequency area to avoid this.
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- PWM Control and VFM Control
- Internal or External Output Transistors
- Output Voltage Setting
- Diode Rectifier and Synchronous Rectifier
- Undervoltage Lockout (UVLO) Function
- Soft-Start Function
- Externally Programmable Maximum Duty Cycle
- Externally Adjustable Phase Compensation
- Overvoltage Protection (OVP)
- Overcurrent Protection
- Sequence Control
- Shutdown Function
- LED High-speed Dimming Control
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