Q48T20050-NBB0 POWER ONE, Q48T20050-NBB0 Datasheet - Page 10

• Manufacturer Part Number: Q48T20050-NBB0
• Manufacturer: POWER ONE
• Type: Step Downr

Specifications of Q48T20050-NBB0

• Number Of Outputs: 1
• Output Current: 20A
• Input Voltage: 48V
• Output Voltage: 5V
• Screening Level: Industrial
• Product Length (mm): 36.83mm
• Product Height (mm): 6.52mm
• Product Depth (mm): 58.42mm
• Mounting Style: Through Hole
• Pin Count: 8
• Package / Case: Quarter-Brick
• Lead Free Status / Rohs Status: Not Compliant

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
See Figure 7.
For this example, the total converter start-up time (t
3 ms.
Scenario #2: Initial Start-up Using ON/OFF Pin
With V
See Figure 8.
For this example, the total converter start-up time (t
3 ms.
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With V
abled via ON/OFF pin. See Figure 9.
For the condition, (t
time (t
be typically 3 ms after release of ON/OFF pin.
NOV 07, 2003 revised to NOV 20, 2006
Time
Time
Time
t
t
t
t
t
t
t
t
t
t
t
t
t
t
0
1
2
3
4
5
0
1
2
3
0
1
2
3
5
IN
IN
- t
previously powered, converter started via ON/OFF pin.
previously powered, converter is disabled and then en-
2
) is typically 103 ms. For (t
V
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.
ON/OFF pin is externally re-enabled.
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.
End of converter turn-on delay.
Converter V
ON/OFF pin is ON; system front end power is toggled
on, V
V
threshold; converter enabled.
Converter begins to respond to turn-on command (con-
verter turn-on delay).
Converter V
V
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
End of converter turn-on delay.
Converter V
IN
IN
INPUT
and V
crosses Under-Voltage Lockout protection circuit
If (t
is locked out by start-up inhibit timer.
If (t
enabled.
IN
at nominal value.
to converter begins to rise.
2
2
2
- t
- t
- t
OUT
1
1
1
) ≤ 100 ms, external action of ON/OFF pin
) > 100 ms, ON/OFF pin action is internally
OUT
) ≤ 100 ms, the total converter start-up
OUT
OUT
are at nominal values; ON/OFF pin ON.
reaches 100% of nominal value.
reaches 100% of nominal value.
reaches 100% of nominal value.
Comments
Comments
Comments
2
- t
Q48T20050 and Q48S20050 DC-DC Converter Data Sheet
1
) > 100 ms, start-up will
3
3
- t
- t
1
1
) is typically
) is typically
Page 10 of 15
IN
.
36-75 VDC Input; 5.0 VDC @ 20A Output
ON/OFF
ON/OFF
ON/OFF
STATE
STATE
STATE OFF
V
V
V
OUT
OUT
OUT
V
V
V
IN
IN
IN
t
t
0
0
OFF
OFF
ON
ON
ON
t
1
t
2
t
t
3
1
Fig. 7: Start-up scenario #1.
Fig. 8: Start-up scenario #2.
Fig. 9: Start-up scenario #3.
t
0
t
2
t
1
100 ms
t
2
t
3
t
3
t
4
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t
5
t
t
t