ACE714

High Efficiency Low Noise PFM Step-up DC/DC Converter

VER 1.2

5

Application Information

Dimming Control

1. Using a PWM Signal to CE Pin

When adding the PWM signal to CE pin, the ACE714 is turned on or off by the PWM signal, so the

LEDs operate at either zero or full current. The average LED current increase proportionally with the duty

cycle of the PWM signal. The frequency range of the PWM signal is from 1 kHz to 300KHz.

2. Using a DC Voltage

From the Figure 2, we can add a DC voltage to FB pin, we adjust the LED current by changing the DC

voltage, which control the brightness, DC voltage range is from 0V to 2V.