CIRRUS SA50CE

SA50CE
SA50CE
P r o SA50CE
d u c t IInnnnoovvaa t i o n FFr roomm
H-Bridge Motor Driver/Amplifiers
FEATURES
• LOW COST COMPLETE H-BRIDGE
• SELF-CONTAINED SMART LOWSIDE/HIGHSIDE DRIVE
CIRCUITRY
• SINGLE ENDED SUPPLY OPERATION
• WIDE SUPPLY RANGE: UP TO 80V
• 5A CONTINUOUS OUTPUT
• HERMETIC SEALED PACKAGE
• HIGH EFFICIENCY: 95% TYPICAL
• FOUR QUADRANT OPERATION, TORQUE CONTROL CAPABILITY
• INTERNAL PWM GENERATION
8-pin TO-3
PACKAGE STYLE CE
TYPICAL APPLICATIONs
APPLICATIONS
+VS
• BRUSH TYPE MOTOR CONTROL
• CLASS D SWITCHMODE AMPLIFIER
• REACTIVE LOADS
• MAGNETIC COILS (MRI)
• ACTIVE MAGNETIC BEARING
• VIBRATION CANCELLING
Vcc
AUDIO
INPUT
SA50CE
SPEAKER
DESCRIPTION
The SA50CE is a pulse width modulation amplifier that can
continuously supply 5A to the load. The full bridge amplifier
can be operated over a wide range of supply voltages. All of
the drive/control circuitry for the lowside and high side switches
are internal to the hybrid. The PWM circuitry is internal as well,
leaving the user to only provide an analog signal for the motor speed and direction, or audio signal for switchmode audio
amplification. The SA50CE is packaged in a space efficient
isolated 8-pin TO-3 that can be directly connected to a heatsink.
GND
+VS
Vcc
ANALOG
INPUT
BLOCK DIAGRAM
SA50CE
DC MOTOR
+VS
GND
EXTERNAL CONNECTIONS
(LOAD)
B
A
+VS
3
VCC
(+12V)
45KHz
PWM
GENERATOR
INPUT
B OUT
2
1
A OUT
4
RSENSE A
5
RSENSE B
TOP VIEW
H-BRIDGE
DRIVE
CIRCUITRY
RSENSE A
RSENSE B
(CURRENT)
6
Vcc
8
7
INPUT
GND
GND
SA50CEU
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 20091
APEX − SA50CEUREVB
SA50CE
P r o d u c t I n n o v a t i o nF r o m
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS
OUTPUT CURRENT, peak
LOGIC SUPPLY VOLTAGE, Vcc
POWER DISSIPATION, internal
TEMPERATURE, pin solder - 10s
TEMPERATURE, junction3
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
INPUT VOLTAGE
80V5
7A
16V
72W1
300°C
175°C
–65 to +150°C
–65 to +125°C
+1V to Vcc – 1.5 Vdc
SPECIFICATIONS
PARAMETER
TEST CONDITIONS2
INPUT
ANALOG INPUT VOLTAGES
MOTOR A, B = 50% Duty Cycle
MOTOR A = 100% Duty Cycle High6
MOTOR B = 100% Duty Cycle High6
OUTPUT
Vds (ON) VOLTAGE, each MOSFET
TOTAL Ron, both MOSFETs
EFFICIENCY, 5A OUTPUT
SWITCHING FREQUENCY
CURRENT, continuous
CURRENT, peak
SWITCHING CHARACTERISTICS4
RISE TIME
FALL TIME
DEAD TIME
POWER SUPPLY
+VS VOLTAGE5
Vcc VOLTAGE
Vcc CURRENT
MIN
TYP
MAX
UNITS
VCC /2
2VCC /3
VCC /3
V
V
V
1.0
0.4
95
45
1.3
50
Vdc
Ω
%
kHz
A
A
36
170
100
54
250
ns
ns
ns
Vcc = 12Vdc
12
20
80
15
30
V
V
mA
Full temp range, for each transistor
Full temperature range
2.0
30
+85
°C/W
°C/W
°C
Vcc = 9.5V to 15V
Ids = 5A
+VS = 80V
40
5
7
t = 100 m-sec
+VS = 28V, Vcc = 12V, Ic =2A
+VS I = Load I
THERMAL
RESISTANCE, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
9.5
3
–40
NOTES: 1. Each of the two active output transistors can dissipate 36W. This is an output FET rating only; normal operation at worst case
conditions and maximum duty cycle only causes 19 watts internal heat generation in each active output FET. Use 40 watts
maximum to size heatsink.
2. Unless otherwise noted: TC = 25°C, Vcc = 12Vdc.
3. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF. For guidance, refer to the heatsink data sheet.
4. Guaranteed but not tested.
5. Derate linearly to 70V at – 40°C from TC = +25°C.
CAUTION
The SA50CE is constructed from MOSFET transistors. ESD handling procedures must be observed.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850°C to avoid generating toxic fumes.
WARNING—AMPLIFIER PROTECTION
The SA50CE contains an internal logic chip that turns on
and turns off output MOSFET drivers at a certain sequence.
Noises or oscillation caused by external wiring inductance,
lack of proper power supply bypass capacitors, ground, supply and local internal loops, may be fed back to this logic chip
and cause it to turn on one or more MOSFET drivers at the
wrong time, thus destroying the SA50CE. A well laid out PC
2
board with low impedance copper ground plane and excellent
bypassing is necessary for the SA50CE to function properly.
A low ESR high frequency bypass capacitor, such as a 0.1 µf
100V X7R ceramic, or better, should be mounted as close to
the Vs and ground pins as possible to avoid radiation of high
frequency transients on the power supply wiring. The Apex
Precision Power EK-SA50CE evaluation board is recommended
for fast and easy breadboarding of circuits using the SA50CE.
SA50CEU
SA50CE
P r o d u c t I n n o v a t i o nF r o m
INPUT CURRENT VS TEMP
POWER DERATING
SINGLE FET POWER CAPABILITY
35
30
25
20
15 MAXIMUM INTERNAL
POWER @ 5A, 80V
10
5
0
-50 -25 0 25 50 75 100 125 150 175
TEMPERATURE, °C
100
0.95
98
0.85
96
0.75
0.65
0.55
0.45
DRAIN-TO-SOURCE CAP, (pF)
OUTPUT RESISTANCE, (NORMALIZED)
1.5
1
0.5
0
–60
–20
20
60 100 140 180
JUNCTION TEMPERATURE (°C)
IO = 5A
0
90% DUTY CYCLE
L/R > 75µ-sec
10 20 30 40 50 60 70 80
SUPPLY VOLTAGE, VS (V)
EFFICIENCY vs. LOAD CURRENT
100
98
400
300
200
VS = 8
0V
VS =
60V
96
94
V =
S
40V
92
V
S
90
88
100
0
IO = 4A
88
84
500
2
IO = 3A
90
0.25
–40 –20 0 20 40 60 80 100 120
CASE TEMPERATURE, (°C)
H-BRIDGE FET CAPACITANCE
IO = 2A
92
86
OUTPUT RESISTANCE DRIFT
2.5
IO = 1A
94
0.35
EFFICIENCY, (%)
POWER, WATTS
40
INPUT BIAS CURRENT, (µA)
45
EFFICIENCY vs. POWER SUPPLY VOLTAGE
1.05
EFFICIENCY, (%)
50
2
5
10 20
50 100
DRAIN-TO-SOURCE VOLTAGE, (V)
0V
90% DUTY CYCLE
L/R > 75µ-sec
96
1
=2
1
2
3
4
LOAD CURRENT, (A)
5
VOLTAGE DROP (V), BOTH FETs
17
=
4
J
3
TJ
=
TJ
2
C
5°
T
VOLTAGE DROP, (V)
5°
C
5
12
5°C
=7
T J=
C
25°
1
0
0
SA50CEU
1
2
3
4
OUTPUT CURRENT, (A)
5
3
SA50CE
P r o d u c t I n n o v a t i o nF r o m
GENERAL
TYPICAL SYSTEM OPERATION
Please read Application Note 30 on "PWM Basics".
Refer to Application Note 1 "General Operating Considerations" for helpful information regarding power
supplies, heat sinking and mounting. Visit www.Cirrus.
com for design tools that help automate pwm filter design and heat sink selection. The "Application Notes"
and "Technical Seminar" sections contain a wealth of
information on specific types of applications. Information
on package outlines, heat sinks, mounting hardware
and other accessories are located in the "Packages and
Accessories" section. Evaluation Kits are available for
most Apex Precision Power product models, consult
the "Evaluation Kit" section for details. For the most
current version of all Apex Precision Power product
data sheets, visit www.Cirrus.com.
6
VCC - is the low voltage supply for powering internal
logic and drivers for the lowside and highside
MOSFETS. The supplies for the highside drivers
are derived from this voltage.
VS - is the higher voltage H-bridge supply. The MOSFETS obtain the output current from this supply
pin. Proper by-passing to GND with sufficient
capacitance to suppress any voltage transients,
and to ensure removing any drooping during
switching, should be done as close to the pins
on the hybrid as possible.
A OUT - is the output pin for one half of the bridge. Increasing the input voltage causes increasing duty cycle at
this output.
B OUT - is the output pin for the other half of the bridge.
Decreasing the input voltage causes increasing duty
cycles at this point.
RSENSE A - This is the connection for the bottom of the A
half bridge. This can have a sense resistor connected
to the VS return ground for current limit sensing, or can
be connected directly to ground. The maximum voltage
on this pin is ±2 volts with respect to GND.
GND - is the return connection for the input logic and VCC.
RSENSE B - This is the connection for the bottom of the B
half bridge. This can have a sense resistor connection
to the VS return ground for current limit sensing, or can
be connected directly to ground. The maximum voltage
on this pin is ±2 volts with respect to GND.
INPUT - is an analog input for controlling the PWM pulse width
of the bridge. A voltage higher than VCC /2 will produce
greater than 50% duty cycle pulses out of A OUT. A
voltage lower than VCC /2 will produce greater than 50%
duty cycle pulses out of B OUT.
4
+VS
Vcc
MOTOR A
22μF
3
SNUBBER NETWORK
4
SA50CE
8
7
INPUT
MOTOR B
2
MOTOR
100Ω
2W
1000pF
200V
MYLAR
GND
RSENSE A
RSENSE B
5
1
6.8μF
100V
POLY
SENSE
RESISTORS
0.1Ω
R
R
PIN DESCRIPTION
+VS
+12V
GND
NO OUTPUT
SWITCHING
CURRENT
+12V
RIN
+12V
RDIVIDE
(VCC÷2)
RDIVIDE
ANALOG
INPUT
Rf
RDIVIDE = 2X Rf
RIN
CURRENT CONTROL
This is a diagram of a typical application of the SA50CE.
The design Vcc voltage is +12 volts. VCC is internally bypassed
with a good low ESR ceramic capacitor. A higher ESR bulk
capacitor, such as a tantalum electrolytic, may be used externally in parallel. The analog input can be an analog speed
control voltage from a potentiometer, other analog circuitry or
by microprocessor and a D/A converter. This analog input gets
pulled by the current control circuitry in the proper direction
to reduce the current flow in the bridge if it gets too high. The
gain of the current control amplifier will have to be set to obtain
the proper amount of current limiting required by the system.
Current sensing is done in this case by a 0.1Ω sense resistor
to sense the current from both legs of the bridge separately. It
is important to make the high current traces as big as possible
to keep inductance down. The storage capacitor connected to
the VS and the hybrid GND should be large enough to provide
the high energy pulse without the voltage sagging too far. A
low ESR capacitor will be required. Mount capacitor as close
to the hybrid as possible. The connection between GND and
the VS return should not be carrying any motor current. The
sense resistor signal is common mode filtered as necessary
to feed the limiting circuitry. This application will allow full four
quadrant torque control for a closed loop servo system.
A snubber network is usually required, due to the inductance
in the power loop. It is important to design the snubber network
to suppress any positive spikes above +VS and negative spikes
below –2V with respect to pin 7 (GND).
SA50CEU
P r o d u c t I n n o v a t i o nF r o m
SA50CE
Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
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SA50CEU
5