Q24T30015-PAAP
| Model | Q24T30015-PAAP |
| Description | DC-DC Regulated Power Supply Module, 1 Output, 45W, Hybrid, QUARTER BRICK PACKAGE-8 |
| PDF file | Total 14 pages (File size: 252K) |
| Chip Manufacturer | BEL |
Q24T30015 DC-DC Converter Data Sheet
18-36 VDC Input; 1.5 VDC @ 30A 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 7.
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.
t
2
Converter begins to respond to turn-on command
(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
2.5 ms.
Scenario #2: Initial Start-up Using ON/OFF Pin
With V
IN
previously powered, converter started via ON/OFF pin.
See Figure 8.
Time
Comments
t
0
V
INPUT
at nominal value.
t
1
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
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
2.5 ms.
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With V
IN
previously powered, converter is disabled and then
enabled via ON/OFF pin. See Figure 9.
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 output falls
to zero; turn-on inhibit delay period (100 ms typical) is
initiated, and ON/OFF pin action is internally inhibited.
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
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 8.
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 102.5 ms. For
(t
2
- t
1
) > 100 ms,
start-up will
be typically 2.5 ms after release of ON/OFF pin.
V
IN
ON/OFF
STATE
OFF
ON
V
OUT
t
0
t
1
t
2
t
3
t
Fig. 7:
Start-up scenario #1.
V
IN
ON/OFF
STATE OFF
ON
V
OUT
t
0
t
1
t
2
t
3
t
Fig. 8:
Start-up scenario #2.
V
IN
ON/OFF
STATE OFF
100 ms
ON
V
OUT
t
0
t
1
t
2
t
3
t
4
t
5
t
Fig. 9:
Start-up scenario #3.
MCD10224 Rev. 1.0, 07-Sep-10
Page 9 of 14
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