DVD power supply circuit - power supply circuit - circuit diagram - Huaqiang Electronic Network
TOPSwitch-GX uses current mode feedback to achieve very low no-load power consumption. C16, R1 and Q2 provide a constant current to the TOPSwitch-GX control pin. R2 feeds the residual current of Q2 to the M pin. The increase in the feed current reduces the current limit of the TOPSwitch-GX. R11 sets the maximum current point of the device. R6, Q1 and C13 complete the slope compensation. The power supply operates at full frequency at heavy loads and medium loads, and reduces switching frequency at light loads. D9 and C10 rectify and filter the bias voltage. The TOPSwitch-GX frequency dithering function satisfies conducted EMI without the use of common-mode inductors, using only C1, C4, and L1 as EMI filters. D5 and C2 form a capacitor clamp circuit that absorbs leakage inductance energy during normal operation. Zener VR1 clamps this voltage to a safe value under abnormal and load transient conditions. After the clamp is applied, the reverse current flows through D5, and a part of the energy is returned. R5 limits reverse current and works with R7 to limit EMI by limiting drain ringing. Continuous mode operation allows for reduced primary and secondary peak currents to optimize cross regulation and load regulation by reducing voltage drift caused by leakage inductance.
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