IRAM256-1067A

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© 2014 International Rectifier

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May 14, 2014

Typical Application Connection IRAM256-1067A

1. Electrolytic bus capacitors should be mounted as close to the module bus terminals as possible to reduce

ringing and EMI problems. Additional high frequency ceramic capacitor mounted close to the module pins will

further improve performance.

2. In order to provide good decoupling between VCC-VSS and VB1,2,3-VS1,2,3 terminals, the capacitors shown

connected between these terminals should be located very close to the module pins. Additional high frequency

capacitors, typically 0.1µF, are strongly recommended.

3. Value of the boot-strap capacitors depends upon the switching frequency. Their selection should be made

based on IR design tip DN 98-2a, application note AN-1044 or Figure 9. Bootstrap capacitor value must be

selected to limit the power dissipation of the internal resistor in series with the VCC. (see maximum ratings Table

on page 3).

4. After approx. 2ms the FAULT is reset. (see Dynamic Characteristics Table on page 5).

5. PWM generator must be disabled within Fault duration to guarantee shutdown of the system, overcurrent

condition must be cleared before resuming operation.

3-Phase AC

MOTOR

BOOT-STRAP

CAPACITORS

W

V

U

VDD (28)

ITRIP (16)

VSS (29)

100nF

CONTROLLER

V+

DC BUS

CAPACITORS

PHASE LEG

CURRENT

SENSE

VTH (27)

Enable

10m

CURRENT SENSING CAN USE A

SINGLE SENSE RESISTOR OR PHASE

LEG SENSING AS SHOWN

0.1m

15 V

FLT/EN (18)

V+ (13)

VRU (17)

VRV (19)

VRW (21)

HIN2 (22)

HIN1 (20)

HIN3 (23)

LIN1 (24)

LIN2 (25)

LIN3 (26)

VB3 (1)

VB2 (5)

VB1 (9)

W, VS3 (2)

V, VS2 (6)

U, VS1 (10)

5 V