ZXLD1356_10 DIODES [Diodes Incorporated], ZXLD1356_10 Datasheet - Page 6

• Manufacturer Part Number: ZXLD1356_10
• Description: 60V 550mA LED DRIVER with AEC-Q100
• Manufacturer: DIODES [Diodes Incorporated]

A Product Line of
Diodes Incorporated
ZXLD1356
Device Description
(Continued)
Switching thresholds
With V
= V
, the ratios of R1, R2 and R3 define an average V
switching threshold of 200mV (measured on the I
ADJ
REF
SENSE
SENSE
pin with respect to V
). The average output current I
is then defined by this voltage and R
according to:
IN
OUTnom
S
I
= 200mV/R
OUTnom
S
Nominal ripple current is ±30mV/R
S
Adjusting output current
The device contains a low pass filter between the ADJ pin and the threshold comparator and an internal current limiting resistor
(50kΩ nom) between ADJ and the internal reference voltage. This allows the ADJ pin to be overdriven with either DC or pulse
signals to change the V
switching threshold and adjust the output current.
SENSE
Details of the different modes of adjusting output current are given in the applications section.
Output shutdown
The output of the low pass filter drives the shutdown circuit. When the input voltage to this circuit falls below the threshold
(0.2V nom.), the internal regulator and the output switch are turned off. The voltage reference remains powered during
shutdown to provide the bias current for the shutdown circuit. Quiescent supply current during shutdown is nominally 60µA and
switch leakage is below 5µA.
6 of 29
ZXLD1356
December 2010
www.diodes.com
© Diodes Incorporated
Document number: DS33470 Rev. 3 - 2