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SQ24 Datasheet(PDF) 8 Page - Bel Fuse Inc.

Part # SQ24
Description  Available in through-hole and SM packages
PDF  51 Pages
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Manufacturer  BEL [Bel Fuse Inc.]
Direct Link  http://www.belfuse.com
Logo BEL - Bel Fuse Inc.

SQ24 Datasheet(HTML) 8 Page - Bel Fuse Inc.

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SQ24 Series
tech.support@psbel.com
4.8 START-UP INFORMATION (USING NEGATIVE ON/OFF)
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure E.
Time
Comments
t0
ON/OFF pin is ON; system front end power is toggled
on, VIN to converter begins to rise.
t1
VIN crosses Under-Voltage 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 start-up time (t3- t1) is typically
4 ms.
Fig. E: Start-up scenario #1
Scenario #2: Initial Start-up Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure F.
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 start-up time (t3- t1) is
typically 4 ms.
Fig. F: Start-up scenario #2.
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 G.
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 start-up 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 F. 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 start-up time
(t5- t2) is typically 104 ms. For (t2- t1) > 100 ms, start-up will be
typically 4 ms after release of ON/OFF pin.
Fig. G: Start-up scenario #3
VIN
ON/OFF
STATE
VOUT
t
t0
t1 t2
t3
ON
OFF
ON/OFF
STATE
VOUT
t0
t1 t2
t3
ON
OFF
VIN
t
ON/OFF
STATE
OFF
ON
V OUT
t2
t1
t5
V IN
t
t4
t3
100 ms



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