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A Product Line of
Diodes Incorporated
ZXLD1356/ ZXLD1356Q
Typical Applications Circuit
?
V IN (24V)
C1
4.7μF
D1
Rs
0.36V
L1
V IN
I SENSE
LX
100nF
ADJ
ZXLD1356
GND
GND
Pin Descriptions
Pin
Name
Pin
Number
TSOT25 V-DFN3030-6
Function
LX
GND
1
2
1
2, 5
Drain of NDMOS switch
Ground (0V)
Multi-function On/Off and brightness control pin:
?
Leave floating for normal operation.(V ADJ = V REF = 1.25V giving nominal average output
current
o I OUTnom = 0.2V/R S )
ADJ
3
3
?
Drive to voltage below 0.2V to turn off output current
?
?
Drive with DC voltage (0.3V<V ADJ <2.5V) to adjust output current from 24% to 200% of
I OUTnom
Connect a capacitor from this pin to ground to define soft-start time.
Soft-start time is approx.0.2ms/nF
I SENSE
V IN
4
5
4
6
Connect resistor R S from this to V IN to define nominal average output current I OUTnom = 0.2/R S
(Note: R SMIN =0.36V with ADJ pin open circuit)
Input voltage (6V to 60V). Decouple to ground with 4.7μF of higher X7R ceramic capacitor close
to device
Exposed pad (EP) - connected to device substrate.
Pad
—
Pad
To improve thermal impedance of package the EP must be connected to power ground but
should not be used as the 0V (GND) current path.
It can be left floating but must not be connected to any other voltage other than 0V.
ZXLD1356/ ZXLD1356Q
Document number: DS33470 Rev. 4 - 2
2 of 29
www.diodes.com
October 2012
? Diodes Incorporated
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