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SA306
SA306
DESCRIPTION
3 Phase Switching Amplifier
FEATURES
♦ Low cost 3 phase 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 (SA306A)
♦ Independent current sensing for each output
♦ User programmable cycle-by-cycle current
limit protection
♦ Over-current and over-temperature warning
signals
The SA306 is a fully integrated switching amplifier
designed primarily to drive three-phase Brushless
DC (BLDC) motors. Three independent half bridges
provide over 15 amperes peak output current under
microcontroller or DSC control. Thermal and short cir-
cuit monitoring is provided, which generates fault sig-
nals 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 SA306 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.
APPLICATIONS
♦ 3 phase brushless DC motors
♦ Multiple DC brush motors
♦ 3 independent solenoid actuators
FIgURE . BLOCK DIAgRAm
V
S
+
V
DD
V s (p ha se A )
V s (p ha se B & C )
SC
TEMP
I
LIM
/D IS 1
Ia
Ib
Ic
Fault
Logic
Ia '
Ib '
Ic'
V
DD
V
DD
V
DD
D IS 2
At
Ab
Gate
Control
P ha se A
Ia '
Ib '
Ic'
PWM
Signals
Bt
Bb
Control
Logic
A
P ha se B
B
C
O ut A
O ut B
O ut C
Ct
Cb
SGND
P ha se C
SA306 Switching Amplifier
P G N D (A & B )
GND
P G N D (C )
SA306U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2008
(All Rights Reserved)
DEC 2008
APEX − SA306UREVB
SA306
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
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
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.
SA306
min
Typ
max
1
1.8
0.3
3.7
50
*
*
*
*
Test Conditions
2
SA306A
min
Typ
max
*
Units
V
V
V
V
mA
UVLO
50
9
60
*
5.5
*
*
55
*
*
*
V
V
V
mA
4.5
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
25
30
5
6
*
*
mA
*
The specification of SA306A is identical to the specification for SA306 in applicable column to the left.
2
SA306U
Product Innovation From
SA306
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
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
Test Conditions
2
SA306
min
Typ
3.95
100
8
270
270
200
200
50
50
300
250
750
750
SA306A
max
min
Typ
*
*
max
Units
V
mV
A
*
*
*
*
*
*
300
250
600
600
ns
ns
ns
ns
ns
ns
mΩ
mΩ
135
40
1.25
1.5
85
-40
*
*
*
*
125
ºC
ºC
ºC/W
ºC
FIgURE 2. 64-PIN QFP, PACKAgE STYLE hQ
SA306U
3
SA306
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
SA306A
125°C
25°C
SA306
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
SA306U
Product Innovation From
SA306
FIgURE 3. ExTERNAL CONNECTIONS
PGND A & B
PGND A & B
PGND A & B
PGND A & B
V
S
B & C
V
S
B & C
V
S
B & C
V
S
B & C
OUT C
OUT C
OUT B
OUT B
OUT B
OUT A
35
OUT A
34
OUT A
33
32
31
30
29
28
27
NC
NC
NC
NC
36
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
OUT C
NC
PGND C
PGND C
PGND C
HS
53
54
55
56
57
58
37
NC
V
S
A
V
S
A
V
S
A
NC
HS
HS
NC
Cb
NC
Ct
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
Ia
Bt
I
LIM
/DIS1
Bb
SC
SGND
Ab
At
Ic
Ib
V
DD
NC
NC
NC
NC
NC
NC
NC
NC
NC
TABLE . PIN DESCRIPTIONS
29,30,31
51,52,53
55,56,57
3
61
63
1
5
7
Pin #
V
S
(phase A)
OUT C
PGND (phase C)
SC
Cb
Ct
Ic
Ib
I
LIM
/DIS1
Pin Name
Power
Power Output
Power
Logic Output
Logic Input
Logic Input
Analog Output
Analog Output
High Voltage Supply (8.5-60V) supplies phase A only
Half Bridge C Power Output
High Current GND Return Path for Power Output C
Indication of a short of an output to supply, GND or another phase
Logic high commands C phase lower FET to turn on
Logic high commands C phase upper FET to turn on
Phase C current sense output
Phase B 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
SA306U
NC
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