Diodes PAM2861 - Manual (Page 2)

PAM2861
Document number: DSxxxxx Rev. 1 - 1
2 of 12
www.diodes.com
July 2013
© Diodes Incorporated
PAM2861
A Product Line of
Diodes Incorporated
Typical Applications Circuit
Pin Descriptions
Pin
Number
Pin
Name
Function
1 LX Drain of NDMOS switch.
2 GND Ground (0V)
3 VSET
• 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 < VSET< 2.5V) to adjust output current from 12% to 100% of I
OUT
nom
• Drive with PWM signal from open-collector or open-drain transistor, to adjust output current. Adjustment range
1% to 100% of I
OUT
nom for f < 500Hz
• Connect a capacitor from this pin to ground to increase soft-start time.
(Default soft-start time = 0.1ms. Additional soft-start time is approx.1.5ms/1nF)
4 ISENSE
Connect resistor RS from this pin to VIN to define nominal average output current
I
OUT
nom = 0.1/Rs
5 VIN Input voltage (6V to 40V). Decouple to ground with 10 μF or higher X7R ceramic capacitor close to device.