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AP3708NMTR-G1 Datasheet(PDF) 8 Page - BCD Semiconductor Manufacturing Limited |
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AP3708NMTR-G1 Datasheet(HTML) 8 Page - BCD Semiconductor Manufacturing Limited |
8 / 13 page PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3708N Preliminary Datasheet 8 BCD Semiconductor Manufacturing Limited Apr. 2009 Rev. 2. 1 Operation Description Figure 10 illustrates a simplified flyback converter controlled by AP3708N. Constant Primary Peak Current The primary current ip(t) is sensed by a current sense resistor RCS as shown in Figure 10. The current rises up linearly at a rate of: As illustrated in Figure 11, when the current ip(t) rises up to Ipk, the switch Q1 turns off. The constant peak current is given by: The energy stored in the magnetizing inductance LM each cycle is therefore: So the power transferring from the input to the output is given by: where fSW is the switching frequency. When the peak current Ipk is constant, the output power depends on the switching frequency fSW. Constant Voltage Operation The AP3708N captures the auxiliary winding feedback voltage at FB pin and operates in constant- voltage (CV) mode to regulate the output voltage. Assuming the secondary winding is master, the auxiliary winding is slave during the D1 on-time. The auxiliary voltage is given by: Figure 10. Simplified Flyback Converter Controlled by AP3708N M L t vg dt t dip ) ( ) ( = ......(1) Ip 0A See equation 2 Figure 11. Primary Current Waveform Rcs Vcs Ipk = ......(2) 2 2 1 Ipk L Eg M × × = SW M f Ipk L P × × × = 2 2 1 ......(4) () Vd Vo N N V S AUX AUX + × = ......(5) ......(3) + C1 + Co V O D1 Rcs Q1 OUT FB CS GND AP3708N Ns N AUX Np Io Vs V AUX Ip v in L M CMP C2 |
Similar Part No. - AP3708NMTR-G1 |
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Similar Description - AP3708NMTR-G1 |
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