APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
FEATURES
LOW COST COMPLETE H-BRIDGE
SELF-CONTAINED SMART LOWSIDE/HIGHSIDE DRIVE
CIRCUITRY
SINGLE SUPPLY OPERATION
WIDE SUPPLY RANGE: UP TO 80V
5A CONTINUOUS OUTPUT
HERMETIC SEALED PACKAGE
HIGH EFFICIENCY: 95%
FOUR QUADRANT OPERATION, TORQUE
CONTROL CAPABILITY
APPLICATIONS
BRUSH TYPE MOTOR CONTROL
CLASS D SWITCHMODE AMPLIFIER
REACTIVE LOADS
MAGNETIC COILS (MRI)
ACTIVE MAGNETIC BEARING
VIBRATION CANCELLING
DESCRIPTION
The SA51 is a pulse width modulation amplifier that can
supply 5A continuous current to the load. The full bridge
amplifier can be operated over a wide range of supply volt-
ages. All of the drive/control circuitry for the lowside and
highside switches are internal to the hybrid. The user provides
a TTL compatible PWM signal for simultaneous amplitude and
direction control in four quadrant mode. The internal circuitry
will provide proper deadtime protection for each half bridge. All
N-channel FETs mean the best efficiency for the size, both in
terms of on-resistance and switching capability. For an idle/
sleep mode or for fault protection, a TTL compatible disable pin
is provided so as to shut down all four transistors. The SA51
is packaged in a space efficient isolated 8-pin TO-3 that can be
directly connected to a heatsink.
BLOCK DIAGRAM
TYPICAL APPLICATION
EXTERNAL CONNECTIONS
TOP VIEW
1
2
3
4
5
6
7
8
INPUT
A OUT
GND
DISABLE
VCC
RSENSE
B OUT
+V
S
+V
S
(LOAD)
(CURRENT)
H-BRIDGE
DRIVE
CIRCUITRY
RSENSE
GND
(PWM) INPUT
V
CC
(+12V)
B
A
DISABLE
H T T P : / / W W W . A P E X M I C R O T E C H . C O M ( 8 0 0 ) 5 4 6 - A P E X ( 8 0 0 ) 5 4 6 - 2 7 3 9
M I C R O T E C H N O L O G Y
H/BRIDGE MOTOR DRIVER/AMPLIFIER
SA51
Vcc
PWM
INPUT
+V
S
+V
S
SPEAKER
GND
SA51
SA51
DC MOTOR
DISABLE
INPUT
PWM
INPUT
GND
DISABLE
INPUT
Vcc
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
80V
5
OUTPUT CURRENT, peak
7A
LOGIC SUPPLY VOLTAGE, Vcc
16V
POWER DISSIPATION, internal
120W
1
TEMPERATURE, pin solder - 10s
300
C
TEMPERATURE, junction
3
150
C
TEMPERATURE, storage
65 to +150
C
OPERATING TEMPERATURE RANGE, case
65 to +125
C
INPUT VOLTAGE, INPUT
0 to Vcc
INPUT VOLTAGE, DIS
0 to Vcc
SA51
SPECIFICATIONS
PARAMETER
TEST CONDITIONS
2
MIN
TYP
MAX
UNITS
INPUT
PWM PULSE LOW VOLTAGE
0
0.6
Vdc
PWM PULSE HIGH VOLTAGE
3.6
5.0
Vdc
PWM FREQUENCY
45
500
KHz
DISABLE ON
3.6
V
CC
Vdc
DISABLE OFF
0
0.6
Vdc
OUTPUT
Vds (ON) VOLTAGE, each MOSFET
Ids = 5A
1.25
1.8
Vdc
TOTAL Ron, both MOSFETs
0.5
EFFICIENCY, 5A OUTPUT
+V
S
= 80V
95
%
CURRENT, continuous
5
A
CURRENT, peak
T = 100ms
7
A
SWITCHING CHARACTERISTICS
4
+V
S
= 28V, Vcc = 12V, Ic =2A
RISE TIME
36
54
nS
FALL TIME
170
250
nS
DEAD TIME
100
nS
POWER SUPPLY
+V
S
VOLTAGE
5
+V
S
Current = Load Current
80
Vdc
Vcc VOLTAGE
9.5
12
15
Vdc
Vcc CURRENT
Vcc = 12Vdc
11
18
mA
THERMAL
3
RESISTANCE, junction to case
Full temp range, for each transistor
2.0
C/W
RESISTANCE, junction to air
Full temperature range
30
C/W
TEMPERATURE RANGE, case
25
+85
C
The SA51 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.
CAUTION
NOTES: 1. Each of the two active output transistors can dissipate 60W.
2. Unless otherwise noted: T
C
= 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 to 70V below T
C
= +25
C.
WARNING--AMPLIFIER PROTECTION
The SA51 contains an internal logic chip that turns on and
turns off output MOSFET drivers at a certain sequence. Noise
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 SA51. A well laid out PC board with low
impedance copper ground plane is necessary for the
SA51 to function properly. The Apex EK-SA51 evaluation
board is recommended for fast and easy breadboarding of
circuits using the SA51.
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
TYPICAL PERFORMANCE
GRAPHS
SA51
Typical performance curves with Vcc = 12V, PWM at 45kHZ and case temperature at 25
C, unless otherwise specified.
40
120
0.25
0.35
0.45
0.75
0.85
0.95
1.05
INPUT CURRENT VS TEMP
0.55
0.65
1
2
3
LOAD CURRENT, (A)
EFFICIENCY CONTOURS
SUPPLY VOLTAGE, V
S
(V)
60
70
80
20
0
20
40 60
80 100
4
5
PWM BIAS CURRENT, (
A)
0
10
20
30
40
50
CASE TEMPERATURE, (
C)
EFFICIENCY, (%)
LOAD CURRENT, (A)
85
EFFICIENCY VS LOAD CURRENT
9
10
11
12
14
16
13
15
1
2
3
4
5
88
91
94
97
100
INTERNAL POWER DISSIPATION, (W)
POWER DERATING
0
30
60
50
40
10
20
75
CASE TEMPERATURE, T (
C)
100
0
25
50
125
C
Vcc VOLTAGE (V)
2.0
4.0
6.0
8.0
12.0
10.0
14.0
Vcc CURRENT VS VOLTAGE
Vcc CURRENT, (mA)
95%
97%
90%
80%
70%
V
S
= 80V
V
S
= 40V
V
S
= 20V
V
S
= 60V
EACH OUTPUT TRANSISTOR
1
2
5
10
20
50
100
0
100
200
300
400
500
H-BRIDGE FET CAPACITANCE
DRAIN-TO-SOURCE CAP, (pF)
DRAIN-TO-SOURCE VOLTAGE, (V)
JUNCTION TEMPERATURE (
C)
60
180
20
20
60
100
140
OUTPUT RESISTANCE DRIFT
OUTPUT RESISTANCE, (NORMALIZED)
0
0.5
1
1.5
2
2.5
0
PWM FREQUENCY (kHz)
10
Vcc CURRENT VS PWM FREQ
Vcc CURRENT, (mA)
14
15
200
11
12
13
400
600
OUTPUT CURRENT, (A)
0
5
1
2
3
4
0
1
2
3
4
5
VOLTAGE DROP (BOTH MOSFETS)
VOLTAGE DROP, (V)
CASE TEMPERATURE
110
C
85
C
35
C
60
C
Vcc=12V
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
SA51U REV. F JUNE 2002
2002 Apex Microtechnology Corp.
OPERATING
CONSIDERATIONS
SA51
GENERAL
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.apexmicrotech.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 hard-
ware and other accessories are located in the "Packages and
Accessories" section. Evaluation Kits are available for most
Apex product models, consult the "Evaluation Kit" section for
details. For the most current version of all Apex product data
sheets, visit www.apexmicrotech.com.
PIN DESCRIPTION
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.
V
S
- is the higher voltage H-bridge supply. The MOSFETS
obtain the output current from this supply pin. The voltage on
this pin is limited to +80V by the drive IC. The MOSFETS are
rated at 100 volts. 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. When the
PWM input is high, this output will be pulled up to Vs.
B OUT - is the output pin for the other half of the bridge.
When the PWM input is low, this output will be pulled up to Vs.
RSENSE - This is the common connection for the bottom of
the 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.
PWM INPUT - is a TTL compatible input pin for providing the
PWM signal to modulate the output switches. The duty cycle
can be between 0% (DC low) and 100% (DC high).
DISABLE INPUT - is a TTL compatible input for providing a
shutdown signal to the hybrid for disabling all four switches in
the bridge regardless of the PWM input level. A digital 1
disables, a digital 0 enables.
TYPICAL SYSTEM OPERATION
Below is a diagram of a typical application of the SA51. The
design Vcc voltage is +12 volts and should have a low ESR
bypass capacitor such as a tantalum electrolytic. The PWM
and DISABLE signals are typically provided by some type of
microprocessor control. The PWM signal will be a TTL signal
with a pulse frequency required by the system, and pulse duty
cycles according to the required direction/speed. A 0% duty
cycle (continuous TTL low) will mean full voltage to the motor
in one direction. A 100% duty cycle (continuous TTL high) will
mean full voltage to the motor in the other direction. A 50% duty
cycle will hold the motor at 0 RPM.
Current sensing is done in this case by a 0.1 ohm sense
resistor to sense current from either leg of the bridge. It is
important to make the high current traces as wide 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. The
storage capacitor should be a low ESR ceramic capacitor or
large polypropylene capacitor. 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 for the microprocessor. 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 +V
S
and negative spikes
below -2V with respect to Pin 5 (GND) of the hybrid.
SA51
+12V
Vcc
+V
S
+V
S
RSENSE
SENSE
RESISTOR
0.1
270
270
1000pF
200V
100
2W
SNUBBER NETWORK
6.8
F
100V
POLY
4700pF
MYLAR
GND
GND
MICRO-
CONTROLLER
CURRENT
SENSE
AMP
A/D CONV.
PWM
INPUT
DISABLE
INPUT
NO OUTPUT
SWITCHING
CURRENT
IF LONG LENGTH,
TWISTED PAIR
DIGITAL
CURRENT
INFORMATION
MOTOR A
1
3
4
5
MOTOR B
MOTOR
8
2
7
6
22
F
V+ RETURN
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