PBL 3776/1

4

Pin Description

DIP

Symbol

Description

1

PWR GND

1

"Power Ground" from output channel 1. Connected to the ground path (see application examples).

2

T1BL

Output, channel 1, B side lower transistor. The pin will sink current when phase is high.

3

T1BU

Output, channel 1, B side upper transistor. The pin will source current when phase is low.

4

T1AL

Output, channel 1, A side lower transistor. The pin will sink current when phase is low.

5

T1AU

Output, channel 1, A side upper transistor. The pin will source current when phase is high.

6

VBB1

Supply voltage for driving channel 1 outputs.

7

SGND

1

Sense ground channel 1. Logic ground reference and sense ground for the current control feedback-

loop.

8VR

1

Reference voltage, channel 1. Controls the comparator threshold voltage and hence the output

current.

9C

1

Comparator input channel 1. This input senses the instantaneous voltage across the sensing resistor,

filtered by the internal digital filter or an optional external RC network.

10

Phase

1

Controls the direction of channel 1 outputs T1AL, T1AU, T1BL and T1BU.

11

Dis

1

Disable input for channel 1. When HIGH, all four output transistors are turned off, which results in a

rapidly decreasing output current to zero.

12

RC

Clock oscillator RC pin. Connect a 12 kohm resistor to V

obtain the nominal switching frequency of 23.0 kHz and a digital filter blanking time of 1.0

µs.

13

Vcc

Logic voltage supply, nominally +5 V.

14

Dis

2

Disable input for channel 2. When HIGH, all four output transistors are turned off, which results in a

rapidly decreasing output current to zero.

15

Phase

2

Controls the direction of channel 2 outputs T2AL, T2AU, T2BL and T2BU.

16

C

2

Comparator input channel 2. This input senses the instantaneous voltage across the sensing resistor,

filtered by the internal digital filter or an optional external RC network.

17

VR

2

Reference voltage, channel 2. Controls the comparator threshold voltage and hence the output

current.

18

SGND

2

Sense ground channel 1. Logic ground reference and sense ground for the current control feedback-

loop.

19

VBB2

Supply voltage for driving channel 2 outputs.

20

T2AU

Output, channel 2, A side upper transistor. The pin will source current when phase is high.

21

T2AL

Output, channel 2, A side lower transistor. The pin will sink current when phase is low.

22

T2BU

Output, channel 2, B side upper transistor. The pin will source current when phase is low.

23

T2BL

Output, channel 2, B side lower transistor. The pin will sink current when phase is high.

24

PWR GND

2

"Power Ground" from output channel 2. Connected to the ground path (see application examples).

Figure 4. Pin configuration.

PWR GND

1

T1BL

T1BU

T1AL

T1AU

VBB1

SGND

1

VR

1

C

1

Phase

1

Dis

1

PWR GND

2

T2BL

RC

Vcc

Dis

2

T2AL

T2AU

VBB 2

SGND

2

VR

2

C

2

Phase

2

1

2

3

4

5

6

7

8

9

10

11

24

23

12

13

14

21

20

19

18

17

16

15

22

T2BU

PBL

3776/1