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AP3440ABN122 データシート(PDF) 10 Page - Asahi Kasei Microsystems |
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AP3440ABN122 データシート(HTML) 10 Page - Asahi Kasei Microsystems |
10 / 17 page [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 |
同様の部品番号 - AP3440ABN122 |
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同様の説明 - AP3440ABN122 |
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