ZXLD1356ET5TA Diodes Zetex, ZXLD1356ET5TA Datasheet - Page 20

• Manufacturer Part Number: ZXLD1356ET5TA
• Description: IC LED DRIVR WHITE BCKLGT TSOT-5
• Manufacturer: Diodes Zetex
• Type: Backlight, White LEDr

Specifications of ZXLD1356ET5TA

• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Type - Secondary: High Brightness LED (HBLED), White LED
• Frequency: 500kHz
• Voltage - Supply: 6 V ~ 60 V
• Voltage - Output: 60V
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 550mA
• Internal Switch(s): Yes
• Efficiency: 97%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ZXLD1356ET5TR

Application Information
Shutdown Mode
Taking the ADJ pin to a voltage below 0.2V for more than approximately 100µs will turn off the output and supply current to a low
standby level of 65µA nominal.
Note that the ADJ pin is not a logic input. Taking the ADJ pin to a voltage above V
100% nominal average value. (See page 17 graphs for details).
Soft-start
An external capacitor from the ADJ pin to ground will provide a soft-start delay, by increasing the time taken for the voltage on
this pin to rise to the turn-on threshold and by slowing down the rate of rise of the control voltage at the input of the comparator.
Adding capacitance increases this delay by approximately 0.2ms/nF. The graph below shows the variation of soft-start time for
different values of capacitor.
Actual operating waveforms [V
Soft-start operation. LX voltage (Ch2) and Output current (Ch3) using a 22nF external capacitor on the ADJ pin.
ZXLD1356
Document number: DS33470 Rev. 3 - 2
16
14
12
10
-2
8
6
4
2
0
(Continued)
0
IN
=60V, R
Soft Start Time vs Capacitance from ADJ pin to Ground
20
S
=0.36V, L=68µH, 22nF on ADJ]
40
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Capacitance (nf)
60
80
Diodes Incorporated
REF
A Product Line of
100
will increase output current above the
120
© Diodes Incorporated
ZXLD1356
December 2010