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Q24S15050-NS00 Datasheet, PDF (9/14 Pages) Power-One – Q24S15050 DC-DC Converter Data Sheet 18-36 VDC Input; 5 VDC @ 15A Output
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Q24S15050 DC-DC Converter Data Sheet
18-36 VDC Input; 5 VDC @ 15A Output
Start-up Information (using negative ON/OFF)
VIN
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure 7.
Time
t0
Comments
ON/OFF pin is ON; system front end power is toggled
ON/OFF
STATE
OFF
on, VIN to converter begins to rise.
t1
VIN crosses Under-Voltage Lockout protection circuit
ON
threshold; converter enabled.
t2
Converter begins to respond to turn-on command (con-
VOUT
verter turn-on delay).
t3
Converter VOUT reaches 100% of nominal value.
For this example, the total converter start-up time (t3- t1) is typically
2.5 ms.
t
t0 t1 t2
t3
Fig. 7: Start-up scenario #1.
Scenario #2: Initial Start-up Using ON/OFF Pin
VIN
With VIN previously powered, converter started via ON/OFF pin.
See Figure 8.
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
2.5 ms.
ON/OFF
STATE OFF
ON
VOUT
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With VIN previously powered, converter is disabled and then en-
abled via ON/OFF pin. See Figure 9.
Time
Comments
t
t0 t1 t2
t3
t0
VIN and VOUT are at nominal values; ON/OFF pin ON.
Fig. 8: Start-up scenario #2.
t1
ON/OFF pin arbitrarily disabled; converter output falls
VIN
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.
ON/OFF
STATE OFF
100 ms
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 8.
ON
t4
End of converter turn-on delay.
t5
Converter VOUT reaches 100% of nominal value.
VOUT
For the condition, (t2- t1) ≤ 100 ms, the total converter start-up
time (t5- t2) is typically 102.5 ms. For (t2- t1) > 100 ms, start-up will
be typically 2.5 ms after release of ON/OFF pin.
t
t0
t1 t2
t3 t4
t5
Fig. 9: Start-up scenario #3.
JUN 01, 2003 revised to NOV 22, 2006
Page 9 of 14
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