Diodes ZXLD1356/ ZXLD1356Q - Manual (Page 2)

ZXLD1356/ ZXLD1356Q
Document number: DS33470 Rev. 4 - 2
2 of 29
www.diodes.com
October 2012
© Diodes Incorporated
ZXLD1356/ ZXLD1356Q
A Product Line of
Diodes Incorporated
Typical Applications Circuit
V IN I SENSE LX
GND
ZXLD1356 ADJ
V
IN
(24V) Rs
0.36V
4.7µF C1
GND
100nF
D1
L1
Pin Descriptions
Pin
Name
Pin
Number Function
TSOT25 V-DFN3030-6
LX 1 1 Drain of NDMOS switch
GND 2 2, 5 Ground (0V)
ADJ 3 3
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
)
•
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
4 4
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)
V IN
5 6
Input voltage (6V to 60V). Decouple to ground with 4.7µF of higher X7R ceramic capacitor close
to device
Pad — Pad
Exposed pad (EP) - connected to device substrate.
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.