DRV591

SLOS389A – NOVEMBER 2001– REVISED MAY 2002

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4

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

AGND

2

Analog ground

AREF

5

O

Connect 1

µF capacitor to ground for AREF voltage filtering

AVDD

1

I

Analog power supply

COSC

4

I

Connect capacitor to ground to set oscillation frequency (220 pF for 500 kHz, 1 nF for 100 kHz) when the internal

oscillator is selected; connect clock signal when an external oscillator is used

FAULT0

10

O

Fault flag 0, low when active open drain output (see application information)

FAULT1

9

O

Fault flag 1, high when active open drain output (see application information)

FREQ

32

I

Selects 500 kHz switching frequency when a TTL logic low is applied to this terminal; selects 100 kHz switching

frequency when a TTL logic high is applied

IN–

7

I

Negative differential input

IN+

6

I

Positive differential input

INT/EXT

31

I

Selects the internal oscillator when a TTL logic high is applied to this terminal; selects the use of an external oscil-

lator when a TTL logic low is applied to this terminal

OUT–

14, 15,

16, 17

O

Negative bridge-tied load (BTL) output (4 pins)

OUT+

24, 25,

26, 27

O

Positive bridge-tied load (BTL) output (4 pins)

PGND

18, 19,

20, 21,

22, 23

High-current ground (6 pins)

PVDD

11, 12,

13, 28,

29, 30

I

High-current power supply (6 pins)

ROSC

3

I

Connect 120-k

Ω resistor to AGND to set oscillation frequency (either 500 kHz or 100 kHz). Not needed if an

external clock is used.

SHUTDOWN

8

I

Places the amplifier in shutdown mode when a TTL logic low is applied to this terminal; places the amplifier

in normal operation when a TTL logic high is applied