PIN FUNCTIONS

Pin #

Name

Description

1, 36

PWR_GND

Ground connection (1). They also conduct heat from die to printed circuit

copper.

2, 17

PH_1, PH_2

These TTL compatible logic inputs set the direction of current flow through

the load. A high level causes current to flow from OUTPUT A to OUTPUT B.

Logic input of the internal DAC (1). The output voltage of the DAC is a

percentage of the Vref voltage applied according to the thruth table of page 7

See pin 3

5

OUT1A

Bridge output connection (1)

6

DISABLE

Disables the bridges for additional safety during switching. When not

connected the bridges are enabled

7

TRI_cap

Triangular wave generation circuit capacitor. The value of this capacitor

defines the output switching frequency

Supply Voltage Input for logic circuitry

9

GND

Power Ground connection of the internal charge pump circuit

10

Charge pump oscillator output

11

Input for external charge pump capacitor

12

Overvoltage input for driving of the upper DMOS

13, 31

Supply voltage input for output stage. They are shorted internally

14

OUT2A

Bridge output connection (2)

15

Logic input of the internal DAC (2). The output voltage of the DAC is a

percentage of the VRef voltage applied according to the truth table of page 7

16

See pin 15

18, 19

PWR_GND

Ground connection. They also conduct heat from die to printed circuit copper

20, 35

SENSE2, SENSE1

Negative input of the transconductance input amplifier (2, 1)

21

OUT2B

Bridge output connection and positive input of the tranconductance (2)

22

See pin 15

23

See pin 15

24

EA_OUT_2

Error amplifier output (2)

25

EA_IN_2

Negative input of error amplifier (2)

26, 28

Reference voltages for the internal DACs, determining the output current

value. Output current also depends on the logic inputs of the DAC and on

the sensing resistor value

27

SIG_GND

Signal ground connection

29

EA_IN_1

Negative input of error amplifier (1)

30

EA_OUT_1

Error amplifier output (1)

32

See pin 3

33

See pin 3

34

OUT1B

Bridge output connection and positive input of the tranconductance (1)

Note: The number in parenthesis shows the relevant Power Bridge of the circuit. Pins 18, 19, 1 and 36 are connected together.

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