IR3553 datasheet(17/22 Pages) IRF

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November 29, 2012 | FINAL DATASHEET

IR3553

40A Integrated PowIRstage®

INPUT CAPACITORS CVIN

At least two 10uF 1206 ceramic capacitors and one 0.1uF

0402 ceramic capacitor are recommended for decoupling

the VIN to PGND connection. The 0.1uF 0402 capacitor

should be on the same side of the PCB as the IR3553 and

next to the VIN and PGND pins. Adding additional

capacitance and use of capacitors with lower ESR and

mounted with low inductance routing will improve

efficiency and reduce overall system noise, especially in

single‐phase designs or during high current operation.

BOOTSTRAP CAPACITOR CBOOST

A minimum of 0.22uF 0402 capacitor is required for the

bootstrap circuit. A high temperature 0.22uF or greater

value 0402 capacitor is recommended. It should be

mounted on the same side of the PCB as the IR3553 and as

close as possible to the BOOST pin. A low inductance

routing of the SW pin connection to the other terminal of

the bootstrap capacitor is strongly recommended.

VCC DECOUPLING CAPACITOR CVCC

A 0.1uF to 1uF ceramic decoupling capacitor is required at

the VCC pin. It should be mounted on the same side of the

PCB as the IR3553 and as close as possible to the VCC and

PGND (pin 4). Low inductance routing between the VCC

capacitor and the IR3553 pins is strongly recommended.

BODY‐BRAKING® FEATURE

The BBRK# pin should be pulled up to VCC if the feature is

not used by the PWM controller. Use of a small value

resistor or a direct connection to VCC is recommended.

MOUNTING OF HEAT SINKS

Care should be taken in the mounting of heat sinks so as

not to short‐circuit nearby components. The VCC and

Bootstrap capacitors are typically mounted on the same

side of the PCB as the IR3553. The mounting height of

these capacitors must be considered when selecting their

package sizes.

HIGH OUTPUT VOLTAGE DESIGN

CONSIDERATIONS

The IR3553 is capable of creating output voltages above

the 3.3V recommended maximum output voltage as there

are no restrictions inside the IR3553 on the duty cycle

applied to the PWM pin. However if the current sense

feature is required, the common mode range of the

current sense amplifier inputs must be considered. A

violation of the current sense input common mode range

may cause unexpected IR3553 behavior. Also the output

current rating of the device will be reduced as the duty

cycle increases. In very high duty cycle applications

sufficient time must be provided for replenishment of the

Bootstrap capacitor for the control MOSFET drive.

LAYOUT EXAMPLE

Contact International Rectifier for a layout example

suitable for your specific application.

IR3553 Datasheet(PDF) 17 Page - International Rectifier

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