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M51995AFP Datasheet(PDF) 33 Page - Renesas Technology Corp |
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M51995AFP Datasheet(HTML) 33 Page - Renesas Technology Corp |
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33 / 43 page  M51995AP/AFP REJ03D0835-0300 Rev.3.00 Jun 06, 2008 Page 31 of 40 2. Application circuit to make the OVP-reset time fast The reset time may becomes problem when the discharge time constant of CFIN • (R1 + R2) is long. Under such the circuit condition, it is recommended to discharge the CVCC forcedly and to make the VCC low value. This makes the OVP-reset time fast. + + To main transformer R1 VCC GND CVCC R2 CFIN The time constant of this part should be short M51995A Figure 27 Example Circuit Diagram to Make the OVP-Reset-Time Fast 3. OVP setting method using the induced third winding voltage on fly back system For the over voltage protection (OVP), the induced fly back type third winding voltage can be utilized, as the induced third winding voltage depends on the output voltage. Figure 28 shows one of the example circuit diagram. + Main transformer third winding VCC OVP GND CVCC 470 Ω M51995A Figure 28 OVP Setting Method Using the Induced Third Winding Voltage on Fly Back System |
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