HA16114FP View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

Manufacturer

HA16114FP

Switching Regulator for Chopper Type DC/DC Converter

Hitachi -> Renesas Electronics 

HA16114P/PJ/FP/FPJ, HA16120FP/FPJ

4. PWM Output Circuit and Power MOSFET Driving Method

These ICs have built-in totem-pole push-pull drive circuits that can drive a power MOS FET as shown in

figure 4.1. The power MOS FET can be driven directly through a gate protection resistor.

If VIN exceeds the gate breakdown voltage of the power MOS FET additional protective measures should

be taken, e.g. by adding Zener diodes as shown in figure 4.2.

To drive a bipolar power transistor, the base should be protected by voltage and current dividing resistors

as shown in figure 4.3.

VIN

Bias

circuit

Totem-pole output circuit

OUT

To CL

RG

Gate protection

resistor

P.GND

Example:

P-channel power MOSFET

VO

Figure 4.1 Connection of Output Stage to Power MOS FET

VIN

RG

VO

OUT

GND

DZ

Example: N-channel power MOSFET

Figure 4.2 Gate Protection by Zener Diodes

VIN

Base current

limiting resistor

VO

OUT

GND

Base discharging resistor

Example: NPN power transistor

Figure 4.3 Driving a Bipolar Power Transistor

12

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