IR3221 データシートの表示（PDF） - International Rectifier

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IR3221

FULLY PROTECTED H-BRIDGE for DC MOTOR

International Rectifier 

IR3221

Permanent Switching Operation

(Without external RC time constant)

+5V

Additional Schottky diodes

have to be implemented if

the I.C temperature appears

too high.

Micro Vcc

Controller

Direction &

Braking

A over-voltage protection

may be needed depending

on the power supply wire

Speed

Gnd

length

0V

Additional

Schottky diodes

In1

In2

IR 3221

ss

Star Connection

Over-voltage

protection

+Bat

DC Motor

-Bat

Note: SS pin ( through a resistor ) can either drive the PWM duty cycle of the inner 20 kHz oscillator or force the

switching frequency ( 5V external clock signal ).

IN 1(2)

Vcc

90%

Vcc - 5 V

M1 (2)

10%

Td on

dV/dt on

Tr 1

Tr 2

Figure 3 - Switching times definition (turn-on)

IN1(2)

90%

M1(2)

dV/dt off

10%

Td off

Tf

Figure 4 - Switching times definition (turn-off)

6

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