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QM48S40033 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3 VDC @ 40A Output
Start-up Information (using negative ON/OFF)
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via application of V IN .
See Figure E.
V IN
ON/OFF
Time
t 0
t 1
t 2
Comments
ON/OFF pin is ON; system front end power is toggled
on, V IN to converter begins to rise.
V IN crosses Under-Voltage Lockout protection circuit
threshold; converter enabled.
Converter begins to respond to turn-on command (con-
verter turn-on delay).
STATE
V OUT
OFF
ON
t 3 Converter V OUT reaches 100% of nominal value.
For this example, the total converter start-up time (t 3 - t 1 ) is typically
4 ms.
t 0
t 1 t 2
t 3
t
Fig. E: Start-up scenario #1.
V IN
Scenario #2: Initial Start-up Using ON/OFF Pin
With V IN previously powered, converter started via ON/OFF pin.
See Figure F.
Time
Comments
t 0
t 1
V INPUT at nominal value.
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
ON/OFF
STATE OFF
t 2 End of converter turn-on delay.
t 3 Converter V OUT reaches 100% of nominal value.
For this example, the total converter start-up time (t 3 - t 1 ) is typically
4 ms.
Scenario #3: Turn-off and Restart Using ON/OFF Pin
V OUT
ON
With V IN previously powered, converter is disabled and then en-
abled via ON/OFF pin. See Figure G.
t 0
t 1 t 2
t 3
t
Time
t 0
t 1
Comments
V IN and V OUT are at nominal values; ON/OFF pin ON.
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.
V IN
Fig. F: Start-up scenario #2.
t 2
ON/OFF pin is externally re-enabled.
If (t 2 - t 1 ) ≤ 100 ms , external action of ON/OFF pin
is locked out by start-up inhibit timer.
If (t 2 - t 1 ) > 100 ms , ON/OFF pin action is internally
ON/OFF
STATE OFF
100 ms
enabled.
t 3
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.
V OUT
ON
t 4 End of converter turn-on delay.
t 5 Converter V OUT reaches 100% of nominal value.
For the condition, (t 2 - t 1 ) ≤ 100 ms , the total converter start-up
time (t 5 - t 2 ) is typically 104 ms. For (t 2 - t 1 ) > 100 ms , start-up will
be typically 4 ms after release of ON/OFF pin.
t 0
t 1 t 2 t 3 t 4 t 5
Fig. G: Start-up scenario #3.
t
FEB 10, 2004 revised to NOV 13, 2006
Page 8 of 13
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