PQ60033SMX15 Datasheet, PDF (14/15 Pages) SynQor Worldwide Headquarters – Output current limit and short circuit protection

Technical
Specification
PQ60033SMx15
Figure F shows three turn-on scenarios, where a Startup Inhibit
Period is initiated at t₀, t₁, and t₂:
Before time t₀, when the input voltage is below the UVLO
threshold, the unit is disabled by the Input Under-Voltage Lockout
feature. When the input voltage rises above the UVLO threshold,
the Input Under-Voltage Lockout is released, and a Startup Inhibit
Period is initiated. At the end of this delay, the ON/OFF pin is
evaluated, and since it is active, the unit turns on.
At time t₁, the unit is disabled by the ON/OFF pin, and it cannot
be enabled again until the Startup Inhibit Period has elapsed.
When the ON/OFF pin goes high after t₂, the Startup Inhibit
Period has elapsed, and the output turns on within the typical
Turn-On Time.
V_in
Under-Voltage
Lockout
Turn-On
Threshold
ON/OFF
(neg logic)
ON
V_out
2ms
(typical power-up
inhibit period)
t
0
OFF ON
200ms
t
1
Figure F: Startup Inhibit Period (turn-on time not to scale)
OFF
200ms
t
2
ON
35ms (typical
turn on time)
t
Product # PQ60033SMx15
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Doc.# 005-0005163 Rev. C
06/28/11
Page 14