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AP3101MTR-E1 Datasheet(PDF) 9 Page - BCD Semiconductor Manufacturing Limited |
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AP3101MTR-E1 Datasheet(HTML) 9 Page - BCD Semiconductor Manufacturing Limited |
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9 / 14 page  GREEN MODE PWM CONTROLLER AP3101 Preliminary Datasheet 9 Apr. 2007 Rev. 1. 3 BCD Semiconductor Manufacturing Limited Typical Performance Characteristics (Continued) Figure 10. Skip Level vs. Ambient Temperature Figure 11. Oscillator Frequency vs. Timing Resistor -40 -20 0 2040 6080 100 120 1.14 1.16 1.18 1.20 1.22 1.24 1.26 Ambient Temperature ( oC) 12 15 18 21 24 27 30 33 36 39 42 30 45 60 75 90 105 120 135 Timing Resistor (kΩ) Operation Description The AP3101 is specially designed for off-line AC-DC adapter and battery charger applications. It offers the designer a cost effective solution with minimal external components. Oscillator The oscillation frequency is programmed by the value of resistor R1 connected from pin RI to ground. The resistor will make a constant current source to deter- mine the oscillation frequency by charging and dis- charging an internal capacitor. The oscillation frequency can be expressed as: The recommended oscillation frequency is 50 to 100 kHz. Start-up Current and Operating Current The typical start-up current is only 30 µA. With such a low start-up current, the start-up resistor may have a very high resistance value even in 85V line voltage; however, higher resistance will cause longer start-up time. So we must select a proper start-up resistor and a proper VCC hold-up capacitor. Operating current is lowered to 3mA. It can reduce the requirement of VCC hold-up capacitor value and the power loss in AP3101. Under-Voltage Lockout (UVLO) An UVLO comparator is included in AP3101 to detect the voltage on the VCC pin. It ensures AP3101 to draw adequate energy from hold-up capacitor during power on. The turn-on threshold is 16V and the turn- off threshold is 10V. Current Sense Comparator and PWM Latch AP3101 operates as a current mode controller, the output switch conduction is initiated by every oscilla- tor cycle and terminated when the peak inductor cur- rent reaches the threshold level established by the FB pin. The inductor current signal is converted to a volt- age signal by inserting a referenced sense resistor RS ) ( ) ( 1 1690 kHz k R f Ω ≈ |
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