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SQM48T/S20 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 20A Outputs
V IN
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 F.
Time Comments
ON/OFF
STATE
OFF
t 0
t 1
t 2
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 (converter turn-on delay).
V OUT
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 3 ms.
t 0
t 1 t 2
t 3
t
Fig. F: 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 G.
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 3 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 H.
V IN
ON/OFF
STATE OFF
ON
V OUT
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
V IN
t 0 t 1 t 2 t 3
Fig. G: Start-up scenario #2.
t
timer.
If (t 2 - t 1 ) > 100 ms , ON/OFF pin action is
internally enabled.
ON/OFF
STATE OFF
100 ms
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 G.
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 103 ms. For (t 2 - t 1 ) > 100 ms ,
V OUT
start-up will be typically 3 ms after release of ON/OFF pin.
t 0
t 1
t 2
t 3 t 4
t 5
t
Fig. H: Start-up scenario #3.
MCD10208 Rev. 1.0, 08-Jul-10
Page 7 of 33
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