ACPL-P340-500E Просмотр технического описания (PDF) - Avago Technologies

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ACPL-P340-500E

1.0 Amp Output Current IGBT Gate Drive Optocoupler with Rail-to-Rail Output Voltage in Stretched SO6

Avago Technologies 

Application Information

Product Overview Description

The ACPL-P340/W340 is an optically isolated power output

stage capable of driving IGBTs of up to 50 A and 1200 V.

Based on BCDMOS technology, this gate drive optocou-

pler delivers higher peak output current, better rail-to-rail

output voltage performance and two times faster speed

than the previous generation products.

The high peak output current and short propagation delay

are needed for fast IGBT switching to reduce dead time

and improve system overall efficiency. Rail-to-rail output

voltage ensures that the IGBT’s gate voltage is driven to

the optimum intended level with no power loss across

IGBT. This helps the designer lower the system power

which is suitable for bootstrap power supply operation.

It has very high CMR(common mode rejection) rating

which allows the microcontroller and the IGBT to operate

at very large common mode noise found in industrial

motor drives and other power switching applications. The

input is driven by direct LED current and has a hysteresis

that prevents output oscillation if insufficient LED driving

current is applied. This will eliminates the need of addi-

tional Schmitt trigger circuit at the input LED.

The stretched SO6 package which is up to 50% smaller

than conventional DIP package facilitates smaller more

compact design. These stretched packages are compliant

to many industrial safety standards such as IEC/EN/DIN EN

60747-5-2, UL 1577 and CSA.

Recommended Application Circuit

The recommended application circuit shown in Figure 22

illustrates a typical gate drive implementation using the

ACPL-P340. The following describes about driving IGBT.

However, it is also applicable to MOSFET. Designers will

need to adjust the VCC supply voltage, depending on the

MOSFET or IGBT gate threshold requirements (Recom-

mended VCC = 15 V for IGBT and 12 V for MOSFET).

The supply bypass capacitors (1 F) provide the large

transient currents necessary during a switching transition.

Because of the transient nature of the charging currents, a

low current (3.0 mA) power supply will be enough to power

the device. The split resistors (in the ratio of 1.5:1) across

the LED will provide a high CMR response by providing a

balanced resistance network across the LED.

The gate resistor RG serves to limit gate charge current

and controls the IGBT collector voltage rise and fall times.

In PC board design, care should be taken to avoid routing

the IGBT collector or emitter traces close to the ACPL-P340

input as this can result in unwanted coupling of transient

signals into ACPL-P340 and degrade performance.

R

ANODE

1

NC

+_

2

R CATHODE

3

VCC

6

VCC = 15 V

VOUT

1 MF

+_

Rg

5

Q1

VEE

VEE = 5 V +_

4

Q2

Figure 22. Recommended application circuit with split resistors LED drive

+ HVDC

+

V_CE

3-HVDC

AC

+

V_CE

-HVDC

14

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