2

Interface

Buffer

1

2

6

7

8

Opto Coupler

Control

Input

180



Figure 1: VLA507/VLA513 Block Diagram

Circuit Explanation: The BG2C is a basic two channel gate driver designed around the recommended

application circuits for the Powerex VLA507 and VLA513 hybrid IGBT gate drivers in combination with either

VLA106-15242 or VLA106-24242 isolated DC to DC converters.

A functional block diagram of the VLA507/513 hybrid gate drivers is shown for reference in Figure 1.

These gate drivers are optimized for use with Powerex NFH series and CM**DUS-12F IGBT modules. The

drivers use a high speed open collector type opto-coupler to provide 2500VRMS isolation of control signals. The

output stage is designed to provide high current gate drive with the appropriate on and off-state bias voltages for

large IGBT modules.

For additional detailed information on the characteristics and operation of these gate

drivers please refer to the individual device data sheets.

Figure 2 shows a block diagram of the VLA106-15242 and VLA106-24242 hybrid DC to DC converters.

These two devices are identical except that VLA106-15242 is designed to operate from a 15 VDC input and the

VLA106-24242 is designed to operate from a 24 VDC input. These DC to DC converters use a transformer to

provide 2500VRMS isolation for gate drive power. The

converter’s regulated 24VDC output is split using a

resistor and zener diode to provide +15.8V and -8.2V for the hybrid gate driver.

For additional detailed

information on the operation of the hybrid DC to DC converters please see the individual device data sheets.

Component Selection:

Designation

Typical Value

Description

Example: Mfg./PN

Z1, Z2, Z3, Z4

16V, 1W

Gate Voltage Surge Protection

1N4745

C1, C2, C3, C4, C5

390

F, 35V

Power supply filter

– Electrolytic, low Impedance Panasonic EEU-FC1V391S

CN1, CN2**

MTA .100”

Input and gate connections

AMP 640457-6

** Recommended mating connector AMP CST-100 Housing P/N 770602-6 with crimp contact 770666-2.

Figure 2: VLA106-15242, VLA106-24242

Block Diagram

Voltage Regulator

Current Limiter

10

11

8

3

2

1

3.3K

Com

24V

9

+

-

CN1

IN2

GND

IN1

CN2

G1

E1

G2

E2

C3

C4

Figure 3: BG2C Schematic and Component Selection

+

C2

Z1

Z2

C1

+

+

VLA507/VLA513

1

VLA106-15242/VLA106-24242

2

5

8

C5

Z4

Z3

+

+

11

8

3

1

VLA106-15242/VLA106-24242

VLA507/VLA513

1 2

5

8

1

3

8

11