CIRRUS LOGIC SA57 Service Manual

SA57

P r o d u c t I n n o v a t i o n F r o m

Switching Amplifier

SA57

P r o d u c t I n n o v a t i o n F r o m

SA57 Switching Amplifier

V s 1

P G N D 1

Gate

Control

PWM

Signals

O u t 1

O u t 2

P G N D 2

T E M P

GND

V s 2

VS+

I

LIM

/D IS1

S C

D IS 2

S G N D

P has e 1

P has e 2

Control

Logic

V

DD

I1' I2'

I1'

I2'

Fault

Logic

I1
I2

1t
1b

2t

2b

V

DD

V

DD

FEATURES

♦ Low cost intelligent switching amplier
♦ Directly connects to most embedded Micro

controllers and Digital Signal Controllers

♦ Integrated gate driver logic with dead-time

generation and shoot-through prevention

♦ Wide power supply range (8.5V to 60V)
♦ Over 15A peak output current per phase
♦ 5A continuous output current per phase
8A continuous for A-Grade (SA57A)
♦ Independent current sensing for each output
♦ User programmable cycle-by-cycle current

limit protection

♦ Over-current and over-temperature warning

signals

APPLICATIONS

♦ Bidirectional DC brush motors
♦ 2 unidirectional DC brush motors
♦ 2 independent solenoid actuators
♦ Stepper motors

DESCRIPTION

The SA57 is a fully integrated switching amplier de-

-

signed primarily to drive DC brush motors. Two inde­pendent half bridges provide over 15 amperes peak
output current under microcontroller or DSC control.
Thermal and short circuit monitoring is provided, which
generates fault signals for the microcontroller to take
appropriate action. A block diagram is provided in Fig­ure 1.

Additionally, cycle-by-cycle current limit offers user
programmable hardware protection independent of the
microcontroller. Output current is measured using an
innovative low loss technique. The SA57 is built using
a multi-technology process allowing CMOS logic con­trol and complementary DMOS output power devices
on the same IC. Use of P-channel high side FETs en­ables 60V operation without bootstrap or charge pump
circuitry.

The Power Quad surface mount package balances ex­cellent thermal performance with the advantages of a

low prole surface mount package.

FIGURE 1. BLOCK DIAGRAM

SA57U 1

http://www.cirrus.com

Copyright © Cirrus Logic, Inc. 2008

(All Rights Reserved)

OCT 2008



SA57

P r o d u c t I n n o v a t i o n F r o m

1. CHARACTERISTICS AND SPECIFICATIONS

NOTES:

1. (All Min/Max characteristics and specications are guaranteed over the Specied Operating Condi­tions. Typical performance characteristics and specications are derived from measurements taken

at typical supply voltages and TC = 25°C).

ABSOLUTE MAXIMUM RATINGS

Parameter Symbol Min Max Units

SUPPLY VOLTAGE V

SUPPLY VOLTAGE V

S

DD

LOGIC INPUT VOLTAGE (-0.5) (VDD+0.5) V

OUTPUT CURRENT, peak, 10ms

POWER DISSIPATION, avg, 25ºC

TEMPERATURE, junction

3

TEMPERATURE RANGE, storage T

OPERATING TEMPERATURE, case T

2

I

OUT

2

P

D

T

J

STG

A

−55 125 °C

−40 125 °C

2. Long term operation at elevated temperature will result in reduced product life. De-rate internal power
dissipation to achieve high MTBF.

3. Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any

set of conditions, do not exceed the specied current rating or a junction temperature of 150°C.

SPECIFICATIONS

60 V

5.5 V

17 A

100 W

150 °C

Parameter Test Conditions

2

Min

SA57 SA57A

Typ Max Min Typ Max

Units

LOGIC

INPUT LOW 1 * V

INPUT HIGH 1.8 * V

OUTPUT LOW 0.3 * V

OUTPUT HIGH 3.7 * V

OUTPUT CURRENT

(SC, Temp, I

/DIS1)

LIM

50 * mA

POWER SUPPLY

V

S

VS UNDERVOLTAGE

LOCKOUT, (UVLO)

V

DD

UVLO 50 60 55 V

9 * * V

4.5 5.5 * * V

20 kHz (One phase

SUPPLY CURRENT, V

S

switching at 50% duty

cycle) , VS=50V, VDD=5V

25 30 * * mA

20 kHz (One phase

SUPPLY CURRENT, V

DD

switching at 50% duty

cycle) , VS=50V, VDD=5V

5 6 * * mA

* The specication of SA57A is identical to the specication for SA57 in applicable column to the left.

2 SA57U

P r o d u c t I n n o v a t i o n F r o m

SPECIFICATIONS, continued

SA57

Parameter Test Conditions

CURRENT LIMIT

CURRENT LIMIT
THRESHOLD (V

Vth HYSTERESIS 100 * mV

OUTPUT

CURRENT, CONTINUOUS

RISING DELAY, TD (RISE)

FALLING DELAY, TD (FALL)

DISABLE DELAY, TD (DIS)

ENABLE DELAY, TD (DIS) See Figure 10 200 * ns

RISE TIME, T (RISE)

FALL TIME, T (FALL)

ON RESISTANCE

SOURCING (P-CHANNEL)

ON RESISTANCE

SINKING (N-CHANNEL)

THERMAL

THERMAL WARNING

THERMAL WARNING
HYSTERESIS

RESISTANCE, junction to
case

TEMPERATURE RANGE,

case

th)

25ºC Case Temperature 5 8 A

See Figure 10 270 * ns

See Figure 10 270 * ns

See Figure 10 200 * ns

See Figure 11 50 * ns

See Figure 11 50 * ns

5A Load 300 750 300 600 mΩ

5A Load 250 750 250 600 mΩ

Full temperature range 1.25 1.5 * * ºC/W

Meets Specications -25 85 -40 125 ºC

2

Min

SA57 SA57A

Typ Max Min Typ Max

3.95 * V

135 * ºC

40 * ºC

Units

FIGURE 2. 64-PIN QFP, PACKAGE STYLE HQ

SA57U 3

SA57

P r o d u c t I n n o v a t i o n F r o m

DIODE FORWARD VOLTAGE - TOP FET

(P-Channel)

0

1

2

3

4

5

FORWARD VOLTAGE (V)

CURRENT (A)

0.5 1.51.31.10.90.7

DIODE FORWARD VOLTAGE - BOTTOM FET

(N-Channel)

0

1

2

3

4

5

FORWARD VOLTAGE (V)

CURRENT (A)

0.5 1.51.31.10.90.7

ON RESISTANCE - TOP FET

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

0.6

0.65

0.7

0.75

0.8

I

OUT

,(A)

RDS(on),(Ω)

VS=11

VS=13

VS=15

VS>17

100 987654321

(P-Channel)

ON RESISTANCE - BOTTOM FET

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

0.6

0.65

0.7

0.75

0.8

10

I

OUT

,(A)

RDS(on),(Ω)

VS=11

VS=13

VS=15

VS=17

VS>22

0 987654321

(N-Channel)

POWER DERATING

0

20

40

60

80

100

120

CASE TEMPERATURE, T

C

POWER DISSIPATION, P

D

SA57

SA57A

-40 12080400

VDD SUPPLY CURRENT

4.5

4.6

4.7

4.8

4.9

5

0 50 100 150 200 250 300

FREQUENCY (kHz)

V

DD

SUPPLY CURRENT (mA)

ONE PHASE SWITCHING @
50% DUTY CYCLE; VS=50V

VDD SUPPLY CURRENT

4

4.5

5

5.5

6

6.5

7

7.5

8

10 20 30 40 50 60

VS SUPPLY VOLTAGE (V)

V

DD

SUPPLY CURRENT (mA)

ONE PHASE SWITCHING
FREQUENCY = 20kHz
50% DUTY CYCLE

25°C

125°C

CURRENT SENSE

0.1

1

10

0.01 0.1 1 10
SENSE CURRENT (mA)

LOAD CURRENT (A)

VS SUPPLY CURRENT

20

40

60

80

100

120

140

160

180

0 50 100 150 200 250 300

FREQUENCY (kHz)

V

S

SUPPLY CURRENT (mA)

ONE PHASE SWITCHING @
50% DUTY CYCLE; VS=50V

0

VS SUPPLY CURRENT

0

5

10

15

20

25

VS SUPPLY VOLTAGE (V)

V

S

SUPPLY CURRENT (mA)

125°C

25°C

ONE PHASE SWITCHING
FREQUENCY = 20kHz
50% DUTY CYCLE

10 20 30 40 50 60

4 SA57U

P r o d u c t I n n o v a t i o n F r o m

FIGURE 3. EXTERNAL CONNECTIONS

53

54

55

56

57

58

59

60

61

62

63

64

32

31

30

29

28

27

26

25

24

23

22

21

1

2

3

4

5

6

7

8

9

1011121314151617181920

52515049484746454443424140393837363534

33

OUT 2

OUT 2NCV

S

2

V

S

2

V

S

2

V

S

2

NCNCNCNCNC

PGND 1

PGND 1

PGND 1

PGND 1NCOUT 1

OUT 1

OUT 1

I2

NCSCNC

SGND

NC

I

LIM

/DIS1

NC

SGNDNCSGNDNCSGND

NC1bNC1tNC

V

DD

NC

OUT 2

NC

PGND 2

PGND 2

PGND 2

HS

HS

NC

2b

NC

2t

NC

NC

VS 1

VS 1

VS 1

NC

HS

HS

TEMP

NC

DIS2

NC

I1

SA57

TABLE 1. PIN DESCRIPTIONS

Pin # Pin Name Signal Type 

29,30,31 VS (phase 1) Power High Voltage Supply (8.5-60V) supplies phase 1 only
51,52,53 OUT 2 Power Output Half Bridge 2 Power Output

55,56,57 PGND (phase 2) Power High Current GND Return Path for Power Output 2
3 SC Logic Output Indication of a short of an output to supply, GND or another phase
61 2b Logic Input Logic high commands 2 phase lower FET to turn on
63 2t Logic Input Logic high commands 2 phase upper FET to turn on
1 I2 Analog Output

7 I

/DIS1 Logic Input/Output

LIM

Phase 2 current sense output

As an output, logic high indicates cycle-by-cycle current limit, and
logic low indicates normal operation. As an input, logic high places
all outputs in a high impedance state and logic low disables the
cycle-by-cycle current limit function.

SA57U 5