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QD48T033050 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3VDC @ 15A and 5.0VDC @ 10A Outputs
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 5.
V IN
Time Comments
t 0 ON/OFF pin is ON; system front end power is toggled
on, V IN to converter begins to rise.
t 1 V IN crosses Under-Voltage Lockout protection circuit
threshold; converter enabled.
ON/OFF
STATE
OFF
ON
t 2 Converter begins to respond to turn-on command (con-
verter turn-on delay).
t 3 Output voltage V OUT 1 reaches 100% of nominal value.
t 4 Output voltage V OUT 2 reaches 100% of nominal value.
For this example, the total converter start-up time (t 4 - t 1 ) is typically
4 ms.
V OUT 2
V OUT 1
t 0
t 1 t 2
t 3
t 4
V OUT 2
V OUT 1
Fig. 5: Start-up scenario #1.
Scenario #2: Initial Start-up Using ON/OFF Pin
With V IN previously powered, converter started via ON/OFF pin.
See Figure 6.
Time Comments
V IN
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 Output voltage V OUT 1 reaches 100% of nominal value.
t 4 Output voltage V OUT 2 reaches 100% of nominal value.
For this example, the total converter start-up time (t 4 - t 1 ) is typi-
cally 4 ms.
V OUT 2
V OUT 1
ON
V OUT 2
V OUT 1
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With V IN previously powered, converter is disabled and then en-
abled via ON/OFF pin. See Figure 7.
Time Comments
t 0 V IN and V OUT are at nominal values; ON/OFF pin ON.
t 1 ON/OFF pin arbitrarily disabled; converter outputs fall
to zero; turn-on inhibit delay period (100 ms typical) is
initiated, and ON/OFF pin action is internally inhibited.
V IN
t 0 t 1 t 2 t 3 t 4
Fig. 6: 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.
ON/OFF
STATE OFF
100 ms
If (t 2 - t 1 ) > 100 ms , ON/OFF pin action is internally
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 6.
t 4 End of converter turn-on delay.
t 5 Output voltage V OUT 1 reaches 100% of nominal value.
t 6 Output voltage V OUT 2 reaches 100% of nominal value.
For the condition, (t 2 - t 1 ) ≤ 100 ms , the total converter start-up
time (t 6 - t 2 ) is typically 104 ms. For (t 2 - t 1 ) > 100 ms , start-up time
will be typically 4 ms after release of ON/OFF pin.
V OUT 2
V OUT 1
t 0
ON
t 1
t 2 t 3 t 4 t 5 t 6
Fig. 7: Start-up scenario #3.
V OUT 2
V OUT 1
MCD10083 Rev. 1.0, 24-Sep-08
Page 8 of 16
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