P r o d u c
c
t
t
I
I
n n o
o
v
v
a
a
t
t
i
i
o
o
n
n
F
F r o m
rom
odu
nn
SA57
SA57
DESCRIPTION
The SA57 is a fully integrated switching amplifier de-
signed primarily to drive DC brush motors. Two inde-
pendent 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 Fig-
ure 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 con-
trol and complementary DMOS output power devices
on the same IC. Use of P-channel high side FETs en-
ables 60V operation without bootstrap or charge pump
circuitry.
The Power Quad surface mount package balances ex-
cellent thermal performance with the advantages of a
low profile surface mount package.
Switching Amplifier
FEATURES
♦ Low cost intelligent switching amplifier
♦ 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
FIgURE . BLOCK DIAgRAm
V
S
+
V
DD
Vs 1
Vs 2
SC
TEMP
I
LIM
/D IS 1
I1
I2
Fault
Logic
I1'
I2'
V
DD
V
DD
D IS 2
1t
1b
PWM
Signals
2t
2b
SGND
Gate
Control
P ha se 1
I1'
I2'
O ut 1
O ut 2
Control
Logic
P ha se 2
SA57 Switching Amplifier
PGND 1
GND
PGND 2
SA57U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2008
(All Rights Reserved)
OCT 2008
APEX − SA57UREVA
SA57
Product Innovation From
. ChARACTERISTICS AND SPECIFICATIONS
NOTES:
1. (All Min/Max characteristics and specifications are guaranteed over the Specified Operating Condi-
tions. Typical performance characteristics and specifications are derived from measurements taken
at typical supply voltages and T
C
= 25°C).
Parameter
SUPPLY VOLTAGE
SUPPLY VOLTAGE
LOGIC INPUT VOLTAGE
OUTPUT CURRENT, peak, 10ms
2
POWER DISSIPATION, avg, 25ºC
2
TEMPERATURE, junction
3
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE, case
I
OUT
P
D
T
J
T
STG
T
A
−55
−40
V
S
V
DD
(-0.5)
ABSOLUTE mAxImUm RATINgS
Symbol
min
max
60
5.5
(V
DD
+0.5)
17
100
150
125
125
Units
V
V
V
A
W
°C
°C
°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 specified current rating or a junction temperature of 150°C.
SPECIFICATIONS
Parameter
LOgIC
INPUT LOW
INPUT HIGH
OUTPUT LOW
OUTPUT HIGH
OUTPUT CURRENT
(SC, Temp, I
LIM
/DIS1)
POWER SUPPLY
V
S
V
S
UNDERVOLTAGE
LOCKOUT, (UVLO)
V
DD
SUPPLY CURRENT, V
S
SUPPLY CURRENT, V
DD
20 kHz (One phase
switching at 50% duty
cycle) , V
S
=50V, V
DD
=5V
20 kHz (One phase
switching at 50% duty
cycle) , V
S
=50V, V
DD
=5V
4.5
25
UVLO
50
9
5.5
30
*
*
60
*
55
*
*
*
V
V
V
mA
3.7
50
1.8
0.3
*
*
1
*
*
*
V
V
V
V
mA
Test Conditions
2
SA57
min
Typ
max
min
SA57A
Typ
max
Units
5
6
*
*
mA
*
The specification of SA57A is identical to the specification for SA57 in applicable column to the left.
2
SA57U
Product Innovation From
SA57
SPECIFICATIONS, continued
Parameter
CURRENT LImIT
CURRENT LIMIT
THRESHOLD (Vth)
Vth
HYSTERESIS
OUTPUT
CURRENT, CONTINUOUS
RISING DELAY, TD (RISE)
FALLING DELAY, TD (FALL)
DISABLE DELAY, TD (DIS)
ENABLE DELAY, TD (DIS)
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
Full temperature range
Meets Specifications
-25
135
40
1.25
1.5
85
-40
*
*
*
*
125
ºC
ºC
ºC/W
ºC
25ºC Case Temperature
See Figure 10
See Figure 10
See Figure 10
See Figure 10
See Figure 11
See Figure 11
5A Load
5A Load
5
270
270
200
200
50
50
300
250
750
750
8
*
*
*
*
*
*
300
250
600
600
A
ns
ns
ns
ns
ns
ns
mΩ
mΩ
3.95
100
*
*
V
mV
Test Conditions
2
SA57
min
Typ
max
min
SA57A
Typ
max
Units
FIgURE 2. 64-PIN QFP, PACKAgE STYLE hQ
SA57U
SA57
V
S
SUPPLY CURRENT
V
S
SUPPLY CURRENT (mA)
Product Innovation From
25
V
S
SUPPLY CURRENT (mA)
20
15
10
5
0
10
180
160
120
100
80
60
40
20
0
0
140
V
S
SUPPLY CURRENT
10
LOAD CURRENT (A)
CURRENT SENSE
125°C
25°C
1
ONE PHASE SWITCHING
FREQUENCY = 20kHz
50% DUTY CYCLE
20
30
40
50
V
S
SUPPLY VOLTAGE (V)
60
ONE PHASE SWITCHING @
50% DUTY CYCLE; V
S
=50V
50
100 150 200 250 300
FREQUENCY (kHz)
0.1
0.01
0.1
1
SENSE CURRENT (mA)
10
8
V
DD
SUPPLY CURRENT (mA)
7.5
7
6.5
6
5.5
5
4.5
4
10
V
DD
SUPPLY CURRENT
V
DD
SUPPLY CURRENT (mA)
ONE PHASE SWITCHING
FREQUENCY = 20kHz
50% DUTY CYCLE
5
4.9
4.8
4.7
4.6
4.5
0
V
DD
SUPPLY CURRENT
POWER DISSIPATION, P
D
120
100
80
60
40
20
0
-40
POWER DERATING
SA57A
125°C
25°C
SA57
ONE PHASE SWITCHING @
50% DUTY CYCLE; V
S
=50V
50
100 150 200 250 300
FREQUENCY (kHz)
0.8
0.75
(N-Channel)
0.7
0.65
0.6
0.55
V
S
=11
0.5
V
S
=13
0.45
V
S
=15
0.4
0.35
V
S
=17
0.3
0.25
0.2
V
S
>22
0.15
0 1 2 3 4 5 6 7 8 9 10
I
OUT
,(A)
ON RESISTANCE - BOTTOM FET
20
30
40
50
V
S
SUPPLY VOLTAGE (V)
60
0.8
0.75
(P-Channel)
0.7
0.65
0.6
V
S
=11
0.55
V
S
=13
0.5
0.45
V
S
=15
0.4
0.35
0.3
V
S
>17
0.25
0.2
0.15
0 1 2 3 4 5 6 7 8 9 10
I
OUT
,(A)
ON RESISTANCE - TOP FET
0
40
80
120
CASE TEMPERATURE, T
C
RDS(on),(Ω)
RDS(on),(Ω)
DIODE FORWARD VOLTAGE - BOTTOM FET
5
4
(N-Channel)
5
4
CURRENT (A)
3
2
1
DIODE FORWARD VOLTAGE - TOP FET
(P-Channel)
CURRENT (A)
3
2
1
0
0.5
0.7
0.9
1.1
1.3
FORWARD VOLTAGE (V)
1.5
0
0.5
0.7
0.9
1.1
1.3
FORWARD VOLTAGE (V)
1.5
4
SA57U
Product Innovation From
SA57
FIgURE . ExTERNAL CONNECTIONS
PGND 1
PGND 1
PGND 1
PGND 1
OUT 2
OUT 2
OUT 1
35
OUT 1
34
OUT 1
33
32
31
30
29
28
27
V
S
2
V
S
2
V
S
2
V
S
2
NC
NC
NC
NC
NC
NC
NC
36
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
OUT 2
NC
PGND 2
PGND 2
PGND 2
HS
53
54
55
56
57
58
37
NC
V
S
1
V
S
1
V
S
1
NC
HS
HS
NC
2b
NC
2t
NC
59
60
61
62
63
10
12
13
14
15
16
17
18
19
11
64
1
2
3
4
5
6
7
8
9
26
25
24
23
22
20
21
HS
TEMP
NC
DIS2
NC
I1
I2
I
LIM
/DIS1
SC
SGND
SGND
SGND
SGND
1t
V
DD
NC
NC
NC
NC
NC
NC
NC
1b
NC
NC
TABLE . PIN DESCRIPTIONS
29,30,31
51,52,53
55,56,57
3
61
63
1
7
Pin #
V
S
(phase 1)
OUT 2
PGND (phase 2)
SC
2b
2t
I2
I
LIM
/DIS1
Pin Name
Power
Power Output
Power
Logic Output
Logic Input
Logic Input
Analog Output
High Voltage Supply (8.5-60V) supplies phase 1 only
Half Bridge 2 Power Output
High Current GND Return Path for Power Output 2
Indication of a short of an output to supply, GND or another phase
Logic high commands 2 phase lower FET to turn on
Logic high commands 2 phase upper FET to turn on
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
Logic Input/Output
all outputs in a high impedance state and logic low disables the
cycle-by-cycle current limit function.
Signal Type
Simplified Pin Description
SA57U
NC
5
Microchip MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
