SMD IR3220S (3.9mm Width) SOIC-20

FULLY PROTECTED H-BRIDGE FOR D.C. MOTOR


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 operational
and fully protected H-bridge control actuator with forward,
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 Hbridge
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, Hbridge
logic control, soft-start sequence and over-current / overtemperature
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 programmed
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 architecture
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, overtemperature
& 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.