IR3221 データシートの表示（PDF） - International Rectifier
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IR3221 Datasheet PDF : 10 Pages
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IR3221
Protection Characteristics
(High side switch protection)
Symbol
Tsd
Isd
T reset
Parameter
Over-temperature threshold
Over-current threshold
Minimum time to reset protections
Min. Typ. Max. Unit
- 165 -
°C
42 50 60
A
300 -
µS
Test Conditions
see fig. 2
see fig. 2
IN1=IN2 = 0 V
Note : The low side switches present sufficient cooling capability in order to have the whole H-bridge function
protected by the IR 3221 inner temperature sensor.
Truth Table
IN1
IN2 MODES
HS1
LSS1 HS2
LSS2 SS reset
L
L
L
H
L
H
H
L
H
L
H
H
Stand-by with braking - sleep mode **
forward rotation ( normal operation )
forward rotation ( protection triggered )
reverse rotation ( normal operation )
reverse rotation ( protection triggered )
Stand-by without braking
* During Soft-Start sequence, the low side part is switching.
OFF ON
OFF ON
ON
OFF ON* ON
OFF OFF
OFF
ON*
OFF
OFF
OFF
ON
OFF OFF ON* OFF
OFF
OFF
OFF
ON*
OFF
OFF
OFF
OFF
OFF
ON
** Protections are reset in this mode
Block Diagram
SS
VCC
IN 1
Soft Start duty cycle
+
-
Oscillator
10 mA
Gnd
H Bridge logic control
& status feedback
40 V Active Clamp
40 V Active Clamp
S S reset
VCC
IN 2
G1
4
Shoot-through
protection
Over current
shutdown
Over temp.
protection
Over current
shutdown
Low Side
Driver
M1
Low Side
Driver
M2
Shoot-through
protection
G2
Gnd
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