Datasheet > Q24T25015-NCA0G

Q24T25015-NCA0G

更新时间： 2024-01-01 06:21:04

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Q24T25015-NCA0G 数据手册

Q24T25015 DC-DC Converter Data Sheet

18-36 VDC Input; 1.5 VDC @ 25A Output

VIN

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.

ON/OFF

STATE

OFF

Time

t₀

Comments

ON/OFF pin is ON; system front end power is toggled

on, V_INto converter begins to rise.

t₁

t₂

t₃

V_INcrosses Under-Voltage Lockout protection circuit

threshold; converter enabled.

Converter begins to respond to turn-on command

(converter turn-on delay).

V^OUT

Converter V_OUTreaches 100% of nominal value.

For this example, the total converter start-up time (t₃- t₁) is typically

2.5 ms.

t1 t2

Fig. 7: Start-up scenario #1.

VIN

Scenario #2: Initial Start-up Using ON/OFF Pin

With V_INpreviously powered, converter started via ON/OFF pin.

See Figure 8.

Time

t₀

t₁

Comments

V_INPUTat nominal value.

Arbitrary time when ON/OFF pin is enabled (converter

enabled).

ON/OFF

STATE

OFF

t₂

t₃

End of converter turn-on delay.

Converter V_OUTreaches 100% of nominal value.

For this example, the total converter start-up time (t₃- t₁) is typically

2.5 ms.

VOUT

Scenario #3: Turn-off and Restart Using ON/OFF Pin

With V_INpreviously powered, converter is disabled and then

enabled via ON/OFF pin. See Figure 9.

t1 t2

Time

Comments

t₀

t₁

V_INand V_OUTare at nominal values; ON/OFF pin ON.

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.

Fig. 8: Start-up scenario #2.

VIN

t₂

If (t₂- t₁) ≤ 100 ms, external action of ON/OFF pin

is locked out by start-up inhibit timer.

If (t₂- t₁) > 100 ms, ON/OFF pin action is internally

enabled.

100 ms

ON/OFF

STATE

OFF

t₃

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.

t₄

t₅

End of converter turn-on delay.

Converter V_OUTreaches 100% of nominal value.

V^OUT

For the condition, (t₂- t₁) ≤ 100 ms, the total converter start-up

time (t₅- t₂) is typically 102.5 ms. For (t₂- t₁) > 100 ms, start-up will

be typically 2.5 ms after release of ON/OFF pin.

t3 t4

Fig. 9: Start-up scenario #3.

MCD10220 Rev. 1.0, 26-Aug-10

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