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SQ48 Datasheet(PDF) 8 Page - Bel Fuse Inc.

Part # SQ48
Description  Industry-standard quarter-brick pinout
PDF  66 Pages
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Manufacturer  BEL [Bel Fuse Inc.]
Direct Link  http://www.belfuse.com
Logo BEL - Bel Fuse Inc.

SQ48 Datasheet(HTML) 8 Page - Bel Fuse Inc.

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© 2015 Bel Power Solutions, inc.
866.513.2839
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belpowersolutions.com
BCD.00637_AA
Fig. F: Startup scenario #1
Scenario #1: Initial Startup From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure F.
Time
Comments
t0
ON/OFF pin is ON; system front-end power is toggled
on, VIN to converter begins to rise.
t1
VIN crosses undervoltage Lockout protection circuit
threshold; converter enabled.
t2
Converter begins to respond to turn-on command
(converter turn-on delay).
t3
Converter VOUT reaches 100% of nominal value.
For this example, the total converter startup time (t3- t1) is typically
4 ms.
Fig. G: Startup scenario #2.
Scenario #2: Initial Startup Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure G.
Time
Comments
t0
VINPUT at nominal value.
t1
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
t2
End of converter turn-on delay.
t3
Converter VOUT reaches 100% of nominal value.
For this example, the total converter startup time (t3- t1) is typically
4 ms.
Fig. H: Startup scenario #3.
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With VIN previously powered, converter is disabled and then
enabled via ON/OFF pin. See Figure H.
Time
Comments
t0
VIN and VOUT are at nominal values; ON/OFF pin ON.
t1
ON/OFF pin arbitrarily disabled; converter output falls
to zero; turn-on inhibit delay period (100 ms typical) is
initiated, and ON/OFF pin action is internally inhibited.
t2
ON/OFF pin is externally re-enabled.
If (t2- t1)
≤ 100 ms, external action of ON/OFF pin
is locked out by startup inhibit timer.
If (t2- t1) > 100 ms, ON/OFF pin action is internally
enabled.
t3
Turn-on inhibit delay period ends. If ON/OFF pin is
ON, converter begins turn-on; if off, converter awaits
ON/OFF pin ON signal; see Figure G.
t4
End of converter turn-on delay.
t5
Converter VOUT reaches 100% of nominal value.
For the condition, (t2- t1)
≤ 100 ms, the total converter startup time
(t5- t2) is typically 104 ms. For (t2- t1) > 100 ms, startup will be
typically 4 ms after release of ON/OFF pin.



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