HCPL-316J datasheet(2/33 Pages) AVAGO

2 / 33 page

Desat Condition

Pin 6

UVLO

Detected on

(FAULT)

VIN+

VIN-

(VCC2 - VE)

Pin 14

Output

VOUT

Active

Low

Yes

Low

High

Low

High

Low

Not Active

High

Typical Fault Protected IGBT Gate Drive Circuit

The HCPL-316J is an easy-to-use, intelligent gate driver

which makes IGBT VCE fault protection compact, afford-

able, and easy-to-implement. Features such as user con-

figurable inputs, integrated VCE detection, under volt-

Figure 1. Typical desaturation protected gate drive circuit, noninverting.

Output Control

The outputs (VOUT and FAULT) of the HCPL-316J are con-

trolled by the combination of VIN, UVLO and a detected

IGBT Desat condition. As indicated in the below table, the

HCPL-316J can be configured as inverting or non-invert-

ing using the VIN+ or VIN- inputs respectively. When an in-

verting configuration is desired, VIN+ must be held high

and VIN- toggled. When a non-inverting configuration is

desired, VIN- must be held low and VIN+ toggled. Once

UVLO is not active (VCC2 - VE > VUVLO), VOUT is allowed to

go high, and the DESAT (pin 14) detection feature of the

HCPL-316J will be the primary source of IGBT protection.

UVLO is needed to ensure DESAT is functional. Once VU-

VLO+ > 11.6 V, DESAT will remain functional until VUVLO- <

12.4 V. Thus, the DESAT detection and UVLO features of

the HCPL-316J work in conjunction to ensure constant

IGBT protection.

* THESE COMPONENTS ARE ONLY REQUIRED WHEN NEGATIVE GATE DRIVE IS IMPLEMENTED.

Description of Operation during Fault Condition

1. DESAT terminal monitors the IGBTVCEvoltagethrough

DDESAT.

2. When the voltage on the DESAT terminal exceeds

7 volts, the IGBT gate voltage (VOUT) is slowly

lowered.

3. FAULT output goes low, notifying the microcontroller

of the fault condition.

4. Microcontroller takes appropriate action.

–

CBLANK

DDESAT

RPULL-DOWN

VLED2+

DESAT

VCC2

VOUT

VEE

VIN+

VIN-

VCC1

GND1

RESET

FAULT

VLED1+

VLED1-

HCPL-316J

–

µC

–

VCE

–

100

Ω

age lockout (UVLO),“soft”IGBT turn-off and isolated fault

feedback provide maximum design flexibility and circuit

protection.

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