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A Product Line of
Diodes Incorporated
ZXLD1352
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 :
?
V ADJ
PWM
0V
ADJ
ZXLD1352
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
ZXLD1352
GND
GND
This scheme uses the 50k resistor between the ADJ pin and the internal voltage reference as a pull-up resistor for the external
transistor eg MMBT3904.
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
ZXLD1352
GND
If the NMOS transistor within the microcontroller has high Gate / Drain capacitance, this arrangement can inject a negative spike
into ADJ input of the ZXLD1352 and cause erratic operation but the addition of a Schottky clamp diode (eg Diodes Inc.
SD103CWS) to ground and inclusion of a series resistor (3.3k) will prevent this. See the section on PWM dimming for more
details of the various modes of control using high frequency and low frequency PWM signals.
ZXLD1352
Document number: DS33469 Rev. 3 - 2
13 of 21
www.diodes.com
December 2010
? Diodes Incorporated
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