ZXLD1350ET5 Diodes Inc, ZXLD1350ET5 Datasheet - Page 14

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ZXLD1350ET5

Manufacturer Part Number
ZXLD1350ET5
Description
IC, LED DRIVER, BUCK, TSOT-23-5
Manufacturer
Diodes Inc
Datasheet

Specifications of ZXLD1350ET5

Led Driver Application
Automotive Lighting, Illuminated Signs
No. Of Outputs
1
Output Current
350mA
Output Voltage
30V
Input Voltage
7V To 30V
Dimming Control Type
PWM / DC
Topology
Buck
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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0
ZXLD1350
Document number: DS33468 Rev. 8 - 2
Application Information (Continued)
Low frequency PWM mode
When the ADJ pin is driven with a low frequency PWM signal (eg 100Hz), with a high level voltage V
zero, the output of the internal low pass filter will swing between 0V and V
below its turn-off threshold (200mV nom) when the ADJ pin is low. This will cause the output current to be switched on and off
at the PWM frequency, resulting in an average output current I
frequency PWM operating waveforms).
The average value of output current in this mode is given by:
I
This mode is preferable if optimum LED 'whiteness' is required. It will also provide the widest possible dimming range
(approx. 100:1) and higher efficiency at the expense of greater output ripple.
Note that the low pass filter introduces a small error in the output duty cycle due to the difference between the start-up and
shut-down times. This time difference is a result of the 200mV shutdown threshold and the rise and fall times at the output of
the filter. To minimize this error, the PWM duty cycle should be as low as possible consistent with avoiding flicker in the LED.
OUTavg
0.1D
PWM
/R
S
for D
PWM
>0 01
Figure 2. Low frequency PWM operating waveforms
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14 of 22
OUTavg
30V 350mA LED DRIVER with AEC-Q100
proportional to the PWM duty cycle. (See Figure 2 - Low
ADJ
, causing the input to the shutdown circuit to fall
Diodes Incorporated
A Product Line of
ADJ
and a low level of
© Diodes Incorporated
ZXLD1350
March 2011

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