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AP3440ABN111 датащи(PDF) 8 Page - Asahi Kasei Microsystems

номер детали AP3440ABN111
подробное описание детали  High-Accurate Step-Down DC-DC Converter with 4.5A MOSFET
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производитель  AKM [Asahi Kasei Microsystems]
домашняя страница  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

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[AP3440]
016008997-E-00
2016/10
- 8 -
10. Timing Chart
Figure 6. Timing Chart
The AP3440 begin start-up in Soft-Start mode when “H” signal is input to the EN pin while the VIN pin is
4.1V or more. Soft-start operation is controlled by over current and voltage limitations. Each of
thresholds change according to the conditions shown below and return to OCL and OVP threshold
values at Normal Operation after Soft-Start is completed.
During Soft-Start
Normal Operation
Over Current
Limit (OCL)
threshold
SS Pin Voltage < 0.6V: OCL (7.85Atyp) × 1/2
OCL (7.85Atyp)
SS Pin Voltage
≥ 0.6V: OCL (7.85Atyp) × SS voltage/1.2V
Over Voltage
Protection(OVP)
threshold
SS Pin Voltage: Vout/1.2V
OVP (Vout×134%typ)
An open drain Nch-MOSFET of the PG pin(hereinafter called as PG_MOS) is turned off when 10ms is
passed after VOUT became a level within power-good range following soft-start completion. The
PG_MOS is turned on if VOUT is out of the power-good range for more than 2us continuously. PG_MOS
is turned off in 10ms after VOUT is returned into power-good range again.
Vout Discharge
VIN
EN
3V
SS
OCL
OVP
OCL×100%
Vout×134%
VO1,VO2
PG
10ms
+4.67%
-4.41%
2us
0%
OCL×50%
0%
Vout×100%
3V
10ms
2us
10ms
threshold
threshold
signal


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