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A Product Line of
Diodes Incorporated
ZXLD1350
30V 350mA LED DRIVER with AEC-Q100
Application Information (Continued)
Output Current Adjustment by PWM Control
Directly driving ADJ input
A Pulse Width Modulated (PWM) signal with duty cycle D PWM can be applied to the ADJ pin, as shown below, to adjust the
output current to a value above or below the nominal average value set by resistor R S :
PWM
V ADJ
0V
ADJ
ZXLD1350
GND
GND
Driving the ADJ input via open collector transistor
The recommended method of driving the ADJ pin and controlling the amplitude of the PWM waveform is to use a small NPN
switching transistor as shown below:
PWM
ADJ
ZXLD1350
GND
GND
This scheme uses the 200k resistor between the ADJ pin and the internal voltage reference as a pull-up resistor for the
external transistor.
Driving the ADJ input from a microcontroller
Another possibility is to drive the device from the open drain output of a microcontroller. The diagram below shows one
method of doing this:
MCU
10k
ADJ
ZXLD1350
GND
The diode and resistor suppress possible high amplitude negative spikes on the ADJ input resulting from the drain-source
capacitance of the FET. Negative spikes at the input to the device should be avoided as they may cause errors in output
current, or erratic device operation.
PWM dimming can be further split into high frequency and low frequency PWM dimming and how the device responds to
these.
ZXLD1350
Document number: DS33468 Rev. 8 - 2
13 of 22
www.diodes.com
March 2011
? Diodes Incorporated
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