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A Product Line of
Diodes Incorporated
ZXLD1366
Application Information (cont.)
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.
16
14
12
10
8
6
4
2
0
-2
0
20
40
60 80 100 120
CAPACITANCE (nF)
Soft-Start Time vs. Capacitance form ADJ to Ground
Actual Operating Waveforms [V IN = 60V, R S = 0.2 Ω , L = 68 μ H, 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. 8 - 2
19 of 30
www.diodes.com
October 2013
? Diodes Incorporated
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