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A Product Line of
Diodes Incorporated
ZXLD1350
30V 350mA LED DRIVER with AEC-Q100
Block Diagram
R S
V IN
L1
D1
V IN
V IN
R1
Current sense circuit
I SENSE
LX
Voltage
regulator
5V
-
+
Shutdown
C1
circuit
Comparator
-
ADJ
+
MN
200k
4KHz
R2
Vref
1.25V
R3
GND
Figure 1. Block diagram – Pin Connection
Pin Description
Name
LX
GND
ADJ
I SENSE
V IN
Pin No.
1
2
3
4
5
Description
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
I OUTnom =0.1/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 25% to 200% (?) of I OUTnom
? Drive with PWM signal from open-collector or open-drain transistor, to adjust output current.
Adjustment range 25% to 100% of I OUTnom for f>10kHz and 1% to 100% of I OUTnom for f<500Hz
? Connect a capacitor from this pin to ground to increase soft-start time. (Default soft-start time=0.5ms.
Additional soft-start time is approx.0.5ms/nF)
Connect resistor R S from this to V IN to define nominal average output current I OUTnom =0.1/R S
(Note: R SMIN =0.27V with ADJ pin open circuit)
Input voltage (7V to 30V). Decouple to ground with 1μF of higher X7R ceramic capacitor close to
device
ZXLD1350
Document number: DS33468 Rev. 8 - 2
2 of 22
www.diodes.com
March 2011
? Diodes Incorporated
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