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AP3440ABN122 データシート(PDF) 10 Page - Asahi Kasei Microsystems

部品番号 AP3440ABN122
部品情報  High-Accurate Step-Down DC-DC Converter with 4.5A MOSFET
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メーカー  AKM [Asahi Kasei Microsystems]
ホームページ  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

AP3440ABN122 データシート(HTML) 10 Page - Asahi Kasei Microsystems

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[AP3440]
016008997-E-00
2016/10
- 10 -
11.5 Over Voltage Protection (OVP)
The output voltage Vout is limited so as not to rise drastically from the setting value.
Protections
About on Product Function
Condition
Action
OVP
(Over Voltage Protection)
Vout
≥ 134% (typ)
High-side P-ch Power MOSFET = OFF
Low-side N-ch Power MOSFET = ON
11.6 Under Voltage Lockout (UVLO)
The AP3440 stops operation when the input voltage drops to a level that is out of operational range.
Protections
About on Product Function
Condition
Action
UVLO
(Under Voltage Lockout)
VIN
≤ 4.1V
DCDC internal circuit is powered off.
High-side P-ch Power MOSFET = OFF
Low-side N-ch Power MOSFET = OFF
11.7 Over Current Protection (OCL: Over Current Limit)
Current of high-side P-ch power MOSFET is monitored and limited so that the output current does not
become too high.
Protections
About on Product Function
Condition
Action
OCL
(Over Current Limit)
Current of High-side P-ch
power MOSFET
≥7.85A
High-side P-ch Power MOSFET = OFF
Low-side N-ch Power MOSFET = ON
The AP3440 changes OCL level to 75% when OCL is detected 2 cycles continuously. In case that Vout
decreases farther, the AP3440 goes into hiccup mode.
Figure 8. OCL vs Vout
The AP3440 starts hiccup operation that repeats ON and OFF if over current statement is kept for 6
cycles while the output voltage is less than half of the setting value. This counter will be reset if one of
the 6 cycles does not meet the over current condition. In the OFF period of hiccup operation, the
soft-start capacitor is discharged by 1.5uA to reduce the voltage at the SS pin.
[V]
[A]
Io_ave
1/2Vout
6.5A
3.9A
Pulse by Pulse
Hiccup Mode
5.89A
7.85A


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