HA16120FP HITACHI [Hitachi Semiconductor], HA16120FP Datasheet - Page 12

• Manufacturer Part Number: HA16120FP
• Description: Switching Regulator for Chopper Type DC/DC Converter
• Manufacturer: HITACHI [Hitachi Semiconductor]

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 V
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.
12
IN
Totem-pole output circuit
exceeds the gate breakdown voltage of the power MOS FET additional protective measures should
Figure 4.1 Connection of Output Stage to Power MOS FET
circuit
Bias
Figure 4.3 Driving a Bipolar Power Transistor
Figure 4.2 Gate Protection by Zener Diodes
GND
GND
OUT
OUT
Example: N-channel power MOSFET
P.GND
V
V
Base discharging resistor
V
IN
IN
IN
Example: NPN power transistor
Base current
limiting resistor
R
OUT
G
D
Gate protection
resistor
Z
R
To C
G
L
V
V
Example:
P-channel power MOSFET
O
O
V
O