A8180
AiT Semiconductor Inc.
www.ait-ic.com
LED LIGHTING DRIVER
HIGH BRIGHTNESS LED DRIVER WITH INTERNAL SWITCH
PIN DESCRIPTION
Top View
Pin #
Symbol
LX
Function
1
2
Drain of NDMOS switch
Ground (0V)
GND
Multi-function On/Off and brightness control pin:
• Leave floating for normal operation.
• Drive to voltage below 0.2V to turn off output current
• Drive with DC voltage (0.3V < VADJ < 1.2V) to adjust output current from
25% to 100% of IOUTnom. If the ADJ voltage is larger than 1.2V, the output
3
ADJ
current is IOUTnom
.
• Drive with PWM signal from open-collector or open-drain transistor, to
adjust output current.
• Connect a capacitor from this pin to ground to activate soft-start.
(soft-start time is approx.0.06ms/nF)
Connect resistor RS from this pin to VIN to define nominal average output
current IOUTnom=0.1/RS
4
5
ISENSE
Input voltage (6V to 32V). Decouple to ground with 4.7uF or higher X7R
ceramic capacitor close to device
VIN
REV3.0
- APR 2010 RELEASED, JAN 2017 UPDATED -
- 2 -
AITSEMI [ AiT Semiconductor ]
