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SQE48T40018 DC-DC Converter
36-75 VDC Input; 1.8 VDC @ 40 A Output
Data Sheet
V IN
Startup Information (using negative ON/OFF)
Scenario #1: Initial Startup From Bulk Supply
ON/OFF function enabled, converter started via application
of V IN . See Figure E.
Time Comments
ON/OFF
STATE
OFF
t 0
t 1
ON/OFF pin is ON; system front-end power is
toggled on, V IN to converter begins to rise.
V IN crosses undervoltage Lockout protection
circuit threshold; converter enabled.
V OUT
ON
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 startup time (t 3 - t 1 ) is
typically 3 ms.
t 0
t 1 t 2
t 3
Fig. E: Startup scenario #1.
t
Scenario #2: Initial Startup Using ON/OFF Pin
With V IN previously powered, converter started via
ON/OFF pin. See Figure F.
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 Converter V OUT reaches 100% of nominal value.
For this example, the total converter startup time (t 3 - t 1 ) is
typically 3 ms.
Scenario #3: Turn-off and Restart Using ON/OFF Pin
V OUT
ON
With V IN previously powered, converter is disabled and
then enabled via ON/OFF pin. See Figure G.
t 0
t 1 t 2
t 3
t
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
(200 ms typical) is initiated, and ON/OFF pin
action is internally inhibited.
V IN
Fig. F: Startup scenario #2.
t 2
ON/OFF pin is externally re-enabled.
If (t 2 - t 1 ) ≤ 200 ms , external action of
ON/OFF pin is locked out by startup inhibit
ON/OFF
STATE OFF
200 ms
timer.
If (t 2 - t 1 ) > 200 ms , ON/OFF pin action is
internally enabled.
ON
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
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 ) ≤ 200 ms , the total converter
startup time (t 5 - t 2 ) is typically 203 ms. For (t 2 - t 1 ) > 200 ms ,
startup will be typically 3 ms after release of ON/OFF pin.
ZD-01744 Rev 1.1.1, 23-Feb-10
www.power-one.com
t 0
t 1 t 2 t 3 t 4 t 5
Fig. G: Startup scenario #3.
Page 8 of 13
t
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