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Scenario #2: Initial Startup Using ON/OFF Pin
With V IN previously powered, converter started via ON/OFF pin. See Figure F.
Time
t 0
t 1
t 2
t 3
Comments
V INPUT at nominal value.
Arbitrary time when ON/OFF pin is enabled (converter enabled).
End of converter turn-on delay.
Converter V OUT reaches 100% of nominal value.
For this example, the total converter startup time (t 3 - t 1 ) is typically 3 ms.
Fig. F: Startup scenario #2.
V IN
ON/OFF
STATE OFF
ON
V OUT
t 0
t 1 t 2
t 3
t
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 G.
Time
t 0
t 1
t 2
t 3
t 4
t 5
Comments
V IN and V OUT are at nominal values; ON/OFF pin ON.
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.
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
timer.
If (t 2 - t 1 ) > 200 ms , ON/OFF pin action is internally 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 F.
End of converter turn-on delay.
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.
Fig. G: Startup scenario #3.
V IN
ON/OFF
STATE
OFF
200 ms
ON
V OUT
t 0
t 1
t 2
t 3 t 4
t 5
t
SQE48T40015 DC-DC Converter
8
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