MR4530 datasheet(19/43 Pages) SHINDENGEN

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Shindengen Electric MFG.CO.,LTD

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This chapter provides supplementary information for MR4000 Series power supply circuits. Use this information when

designing or evaluating MR4000 Series power supply circuits.

Supplementary design information: Contents

6. Supplementary design information

6.1.1 VCC control

(1) Increasing the damper resistance

(2) NC coil winding method

(3) Adding a dummy resistor

6.1.2 Ringing voltage at turn-off of main switching device

(1) Transformer leakage inductance

(2) Clamp circuit

6.1.3 Resonating capacitor

Selecting the resonating capacitor

(2) Capacity of resonating capacitor

6.1.4 Constants of components around Z/C pin in the circuit

(1) Partial resonance capacitor C114

(2) Partial resonance resistor R115

(3) Z/C pin current limiting resistor R116

6.1.5 Enhancing the peak surge current of VCC pin

6.1.6 Phase correction

(1) Insert C and R between the cathode and REF of the shunt

regulator.

(2) Insert C and R between the front of the secondary LC filter and

REF of the shunt regulator.

(3) Insert C and R between the rear of the secondary LC filter and

REF of the shunt regulator.

(4) Place the power supply side of the photocoupler in front of the

LC filter.

6.2 Noise reduction

6.2.1 Redesigning the transformer

6.2.2 Changing Y capacitor

6.2.3 Using a snubber circuit

6.2.4 Connecting a capacitor to a secondary diode in parallel

6.2.5 Capacitive coupling

6.2.6 Other measures

6.3 Supplemental information on surface mounting

6.3.1 Greasing

6.3.2 Screws

6.3.3 Radiation fin

6. Supplementary design information

MR4000 Series

Application Note

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