ACPL-W340-500E Просмотр технического описания (PDF) - Avago Technologies

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ACPL-W340-500E

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

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Rail-to-Rail Output

Figure 23 shows a typical gate driver’s high current output

stage with 3 bipolar transistors in darlington configuration.

During the output high transition, the output voltage rises

rapidly to within 3 diode drops of VCC. To ensure the VOUT

is at VCC in order to achieve IGBT rated VCE(ON) voltage. The

level of VCC will be need to be raised to beyond VCC+3(VBE)

to account for the diode drops. And to limit the output

voltage to VCC, a pull-down resistor, RPULL-DOWN between

the output and VEE is recommended to sink a static current

while the output is high.

ACPL-P340 uses a power PMOS to deliver the large current

and pull it to VCC to achieve rail-to-rail output voltage

as shown in Figure 24. This ensures that the IGBT’s gate

voltage is driven to the optimum intended level with no

power loss across IGBT even when an unstable power

supply is used.

ANODE 1

NC 2

CATHODE 3

NC 4

8 VCC

7 VOUT

RG

6

RPULL-DOWN

5 VEE

Figure 23. Typical gate driver with output stage in darlington configuration

ANODE 1

NC 2

CATHODE 3

6 VCC

5 VOUT

4 VEE

Figure 24. ACPL-P340/W340 with PMOS and NMOS output stage for rail-to-rail output voltage

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