ZXLD1366_10 DIODES [Diodes Incorporated], ZXLD1366_10 Datasheet - Page 20

• Manufacturer Part Number: ZXLD1366_10
• Description: HIGH ACCURACY 1A, 60V LED DRIVER WITH INTERNAL SWITCH
• Manufacturer: DIODES [Diodes Incorporated]

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 VREF will increase output current above
the 100% nominal average value. (See page 18 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 [VIN=60V, RS=0.2V, L=68μH, 22nF on ADJ]
Soft-start operation. LX voltage (CH2) and Output current (CH3) using a 22nF external capacitor on the ADJ pin.
ZXLD1366
Document number: DS31992 Rev. 5 - 2
16
14
12
10
-2
8
6
4
2
0
0
Soft Start Time vs Capacitance from ADJ pin to Ground
20
40
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Capacitance (nf)
60
80
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© Diodes Incorporated
ZXLD1366
June 2010