MR4530 datasheet(25/43 Pages) SHINDENGEN

25 / 43 page

Shindengen Electric MFG.CO.,LTD

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

At the design stage, keep in mind the following aspects of the

constants for the components around the Z/C pin (Pin 1) in the

circuit.

MR4000

D112

PH141

C114

R115

Fig. 6.7 Circuit around Z/C pin

(1) Partial resonance capacitor C114

The capacity of C114 capacitor should be around 100 pF. Since the Z/C pin (Pin 1) is susceptible to noise, the

capacity should not be lower.

(2) Partial resonance resistor R115

Keep in mind the following when determining the value for R115:

5mA

115



and

5mA

115





The absolute maximum rating for the Z/C pin (Pin 1) is ±5 mA.

Current flowing to the pin cannot exceed this level. (Vin represents

the input capacitor voltage when the maximum input voltage is

applied.)

Determine R115 so that the main switching device is turned on at

the trough of its partial resonance.

(3) Z/C pin current limiting resistor R116

If requirements 1) and 2) of Section (2) above cannot be met

simultaneously, add R116 as shown in Fig. 6.9. R116 should be

around 10 kΩ.

R115 is used to set the partial resonance trough of the main switching

device. Set in the same way as described in Section (2) above.

Large

Small

R115

Trough

Fig. 6.8 Adjusting the resonance trough

MR4000

D112

PH141

C114

R115

R116

Fig. 6.9 Addition of R116

6. Supplementary design information

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