ACPL-331J-000E 查看數據表（PDF） - Avago Technologies

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ACPL-331J-000E

1.5 Amp Output Current IGBT Gate Driver Optocoupler with Integrated (VCE) Desaturation Detection, UVLO, Fault Status Feedback and Active Miller Clamping

Avago Technologies 

Application Information

Product Overview Description

The ACPL-331J is a highly integrated power control

device that incorporates all the necessary components

for a complete, isolated IGBT / MOSFET gate drive circuit

with fault protection and feedback into one SO-16

package. Active Miller clamp function eliminates the need

of negative gate drive in most application and allows the

use of simple bootstrap supply for high side driver. An

optically isolated power output stage drives IGBTs with

power ratings of up to 100 A and 1200 V. A high speed

internal optical link minimizes the propagation delays

between the microcontroller and the IGBT while allowing

the two systems to operate at very large common mode

voltage differences that are common in industrial motor

drives and other power switching applications. An output

IC provides local protection for the IGBT to prevent

damage during over current, and a second optical link

provides a fully isolated fault status feedback signal for

the microcontroller. A built in “watchdog” circuit, UVLO

monitors the power stage supply voltage to prevent IGBT

caused by insufficient gate drive voltages. This integrated

IGBT gate driver is designed to increase the performance

and reliability of a motor drive without the cost, size, and

complexity of a discrete design.

Two light emitting diodes and two integrated circuits

housed in the same SO-16 package provide the input

control circuitry, the output power stage, and two optical

channels. The output Detector IC is designed manufac-

tured on a high voltage BiCMOS/Power DMOS process.

The forward optical signal path, as indicated by LED1,

transmits the gate control signal. The return optical signal

path, as indicated by LED2, transmits the fault status

feedback signal.

Under normal operation, the LED1 directly controls the

IGBT gate through the isolated output detector IC, and

LED2 remains off. When an IGBT fault is detected, the

output detector IC immediately begins a “soft” shutdown

sequence, reducing the IGBT current to zero in a con-

trolled manner to avoid potential IGBT damage from

inductive over voltages. Simultaneously, this fault status

is transmitted back to the input via LED2, where the fault

latch disables the gate control input and the active low

fault output alerts the microcontroller.

During power-up, the Under Voltage Lockout (UVLO)

feature prevents the application of insufficient gate

voltage to the IGBT, by forcing the ACPL-331J’s output

low. Once the output is in the high state, the DESAT (VCE)

detection feature of the ACPL-331J provides IGBT pro-

tection. Thus, UVLO and DESAT work in conjunction to

provide constant IGBT protection.

6, 7

D

ANODE

R

5, 8

I

CATHODE

V

LED1

E

R

2

VCC1

3

FAULT

SHIELD

LED2

UVLO

DESAT

VCLAMP

13

VCC2

11

VOUT

DESAT

14

9, 12

VEE

10

VCLAMP

VE

16

1, 4

VS

SHIELD

Figure 32. Block Diagram of ACPL-331J

15

VLED

Recommended Application Circuit

The ACPL-331J has an LED input gate control, and an

open collector fault output suitable for wired ‘OR’ ap-

plications. The recommended application circuit shown

in Figure 33 illustrates a typical gate drive implementa-

tion using the ACPL-331J. The following describes about

driving IGBT. However, it is also applicable to MOSFET.

Depending upon the MOSFET or IGBT gate threshold re-

quirements, designers may want to adjust the VCC supply

voltage (Recommended VCC = 17.5V for IGBT and 12.5V

for MOSFET).

The two supply bypass capacitors (0.1 µF) provide the

large transient currents necessary during a switching

transition. Because of the transient nature of the charging

currents, a low current (5mA) power supply suffices. The

desaturation diode DDESAT 600V/1200V fast recovery type,

trr below 75ns (e.g. ERA34-10) and capacitor CBLANK are

necessary external components for the fault detection

circuitry. The gate resistor RG serves to limit gate charge

current and controls the IGBT collector voltage rise

and fall times. The open collector fault output has a

passive pull-up resistor RF (2.1 kW) and a 330 pF filtering

capacitor, CF. A 47 kW pull down resistor RPULL-DOWN on

VOUT provides a predictable high level output voltage

(VOH). In this application, the IGBT gate driver will shut

down when a fault is detected and fault reset by next

cycle of IGBT turn on. Application notes are mentioned at

the end of this datasheet.

18

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