MS1003SH datasheet(31/41 Pages) SHINDENGEN

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MS1003SH･MS1004SH

Application Note Ver.2.2

SHINDENGEN ELECTRIC MFG. CO. , LTD

31/41

5.5.4 Design of VG pin

(1) Basic circuit

The VG pin outputs switching signals. It can be used when

the main switching device is a voltage-driven element.

The diagram to the right shows the basic circuit

configuration. The initial design values should be 10 Ω for

the gate resistor R102 and 33 kΩ for the resistor R101

between the gate and the source.

(2) Circuit requiring a drive circuit

The main switching device driving performance of

the MS100x series is specified under “Soft drive” of

“Electric/thermal characteristics” in the

specification. A circuit for enhancing the driving

performance is required between the VG pin and the

main SW device as shown to the right if the main

switching device cannot be driven directly by the

VG pin in the basic circuit (1).

Refer to the diagram to the right to determine

constants.

Use the gate total charge quantity Qg of the main switching device as a guide for determining whether a

driving circuit is required.

Qg of main SW device > 20 nC to 25 nC

Driving circuit required

QG of main SW device < 20 nC

No driving circuit required

(3) Handling high power

Design the drive circuit as shown below if a power supply circuit requires more than one main switching

device. The diagram illustrates an example of a circuit using two main SW devices. For configurations

involving three main SW devices, connect the devices in parallel based on the example. Use the

constants shown in the diagram as initial design values and evaluate to determine optimal constants.

R102

100Ω

R306

10kΩ

R104

R304

100Ω

R305

10Ω

Q302

Q303

Q101

MS1003SH

MS1004SH

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