A7630
DC-DC CONVERTER BOOST (STEP-UP)
1.2MHz, 28V STEP-UP LED DRIVER
AiT Semiconductor Inc.
www.ait-ic.com
PWM BRIGHTNESS DIMMING CONTROL at EN PIN
When EN pin is forced a PWM signal with frequency higher than 20kHz, the chip is in dimming mode. The
internal circuit changes the feedback voltage according to the duty cycle of the PWM signal. The feedback
voltage (VFB) is simply defined as below:
VFB=250mV x Duty Cycle (%)
To shut down the chip, one has to make the EN signal low, and keep its low state for more than 2.5ms.
PACKAGE INFORMATION
Dimension in SOT-26 (Unit: mm)
REV1.0
- FEB 2017 RELEASED -
- 6 -
AITSEMI [ AiT Semiconductor ]
