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International Rectifier Electronic Components Datasheet

IR3220S Datasheet

FULLY PROTECTED H-BRIDGE

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Data Sheet No.PD60180-C
IR3220S
FULLY PROTECTED H-BRIDGE FOR D.C. MOTOR
www.DataSheet4U.com The IR3220S is a fully protected dual high side switch I.C that
integrates an H–bridge motor controller with two very efficient
high side MOSFETs in a single 20-pin package. The IR3220S
combines with the two low side IRF7484Q MOSFETs as few as
10 external passive components to provide a complete, fully op-
erational and fully protected H-bridge control actuator with for-
ward, reverse, braking and non-braking modes without the need
of a micro-controller.
Functional Description
The high side switches provide the direction capability and the H-
bridge protection. The low side MOSFETs bring the flexibility by
offering the high frequency switching ability. Therefore, crude
start-up of the motor is avoided and replaced by a smooth and
stress-less speed ramp-up.
The IR3220S features shoot-through protection for each leg, H-
bridge logic control, soft-start sequence and over-current / over-
temperature shutdown protections. Two input signals (IN1 & IN2)
select the operating modes while the PWM soft-start sequence
cycles the corresponding active low side MOSFET in order to
limit the motor in-rush current. The soft-start sequence is pro-
grammed by an RC time constant and reset itself automatically.
Thanks to the inner PWM oscillator, the IR3220S can also be
the final stage of an overall torque or speed loop. If needed, an
external clock may force the H-bridge switching operation. This
can be combined with low frequency PWM operation through
the IN1(2) inputs.
The IR3220S is a Co-pack IPS product offering very low Rds(on)
and a high level of functionality and protection. Its open architec-
ture and programmability helps the designer to optimize each
motor drive upon the application requirements at a very low cost.
For automotive actuators, the motor is kept shorted even during
the low consumption sleep mode. Shoot-through protection, over-
temperature & over-current shutdowns, self-adaptive dead-time
and PWM circuitries are described in details in the AN 1032
Application Note. A general purpose method to help rating the
soft-start sequence as well as layout and thermal considerations
are also covered. Finally, a 6A DC motor actuator with a PCB
size down to 1 Inch² is suggested in the document.
Features
Programmable PWM In-rush
Current Limitation (e.g 18A)
6 A Continuous Current Capability
without Heat Sink (2 x 13 m)
Over-Temperature (165 °C) and
Over-Current (30A) Protections
20 kHz PWM Oscillator Embedded
Low & High Frequency Switching
Operation (self adaptive dead-time)
Easy Speed / Torque Control
(analog duty cycle input)
Braking / Non-Braking Modes
Sleep Mode (braking) for
Automotive Actuator
Packages
8-Lead SOIC
IRF7484Q
20-Lead SOIC
(wide body)
www.irf.com
1


International Rectifier Electronic Components Datasheet

IR3220S Datasheet

FULLY PROTECTED H-BRIDGE

No Preview Available !

IR3220S
Functional Block Diagram (see AN-1032 for a detailed description of each block)
www.DataSheet4U.com
VCC
IN 1
Soft Start duty cycle
SS Vrc
0.5k 1k
+
5.5 V Ref.
-
Oscillator
10 mA
Gnd
H Bridge logic control
& status feedback
40 V Active Clamp
40 V Active Clamp
S S reset
VCC
IN 2
DG
Shoot-through
protection
Over current
shutdown
Over temp.
protection
Over current
shutdown
Shoot-through
protection
G1
50
Low Side
Driver
Low Side
Driver
50
M1 M2
Gnd
G2
Thanks to the self-adaptive dead-time circuitry, the low side MOSFET of each leg is driven in the opposite
phase of the high side one without any conflict. Thus, the single IN1 signal turns on the leg M1 (and IN2, the
output M2). Consequently, when both IN1 and IN2 are low, the quiescent state of the H-bridge is the Braking
Mode (the two low side MOSFETs on). The over-temperature circuitry and the two over-current protections
(one per leg) protect the IC and flag the DG pin. The thermal shutdown also covers the body diode over-
heating. Fault conditions are reset by cycling the corresponding IN1(2) input. Each leg appears independent
so that the PWM soft-start management is greatly simplified and makes the 20kHz oscillator block almost a
separate function. The positive input of the PWM comparator is accessible on the SS pin. An external analog
voltage or a RC network can either drive the duty cycle. It has to be said that a clock signal (< 20 kHz) applied
on this input will directly drive the low side MOSFETs. A 5V voltage source is embedded in the I.C ( switched
off while in the sleep mode ) so that no additional power supply is needed for the soft-start RC time constant.
Its capacitor is discharged through the ‘’ SS reset ‘’ circuitry every time IN1 equals IN2. Thus, the soft-start
sequence is ready to operate whichever the formerly braking mode was.
2 WWW.IRF.COM


Part Number IR3220S
Description FULLY PROTECTED H-BRIDGE
Maker International Rectifier
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IR3220S Datasheet PDF






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