Datasheet SA50 Datasheet (Apex)

H/BRIDGE MOTOR DRIVER/AMPLIFIER

MICROTECHNOLOGY

HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX [phone]

FEA TURES

• 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: 97%

• FOUR QUADRANT OPERATION, TORQUE
CONTROL CAPABILITY

• INTERNAL PWM GENERATION

APPLICATIONS

• BRUSH TYPE MOTOR CONTROL

• CLASS D SWITCHMODE AMPLIFIER

• REACTIVE LOADS

• MAGNETIC COILS (MRI)

• ACTIVE MAGNETIC BEARING

• VIBRATION CANCELLING

SA50

TYPICAL APPLICATION

Vcc

AUDIO

INPUT

SA50

+V

S

DESCRIPTION

The SA50 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 volt­ages. All of the drive/control circuitry for the lowside and
highside 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/direction, or audio signal for
switchmode audio amplification. The SA50 is packaged in a
space efficient isolated 8-pin TO-3 that can be directly con­nected to a heatsink.

+V

BLOCK DIAGRAM

V

CC

(+12V)

45KHz

PWM

GENERATOR

INPUT

GND

H-BRIDGE

CIRCUITRY

DRIVE

RSENSE B

S

(LOAD)

BA

RSENSE A

(CURRENT)

GND

Vcc

ANALOG

INPUT

GND

SA50

EXTERNAL CONNECTIONS

+V

S

3

A OUT

RSENSE A

4

TOP VIEW

5

6

Vcc

GND

+V

B OUT

2

7

S

DC MOTOR

RSENSE B

1

8

INPUT

SPEAKER

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SA50

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +V
OUTPUT CURRENT, peak 7A
LOGIC SUPPLY VOLTAGE, Vcc 16V
POWER DISSIPATION, internal 120W
TEMPERATURE, pin solder - 10s 300°C
TEMPERATURE, junction
TEMPERATURE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –65 to +125°C
INPUT VOLTAGE +1 to Vcc – 1.5 Vdc

S

3

80V

1

150°C

SPECIFICATIONS

PARAMETER TEST CONDITIONS
INPUT

ANALOG INPUT VOLTAGES Vcc = 12V

MOTOR A, B = 50% Duty Cycle 6 Vdc
MOTOR A = 100% Duty Cycle High 8 Vdc
MOTOR B = 100% Duty Cycle High 4 Vdc

OUTPUT

Vds (ON) VOLTAGE, each MOSFET Ids = 5A 1.25 1.8 Vdc
TOTAL Ron, both MOSFETs 0.5 Ω
EFFICIENCY, 5A OUTPUT +VS = 80V 97 %
SWITCHING FREQUENCY 40 45 50 Khz
CURRENT, continuous 5 A
CURRENT, peak t = 100 msec 7 A
SWITCHING CHARACTERISTICS

RISE TIME 36 54 nS
FALL TIME 170 250 nS
DEAD TIME 100 nS

4

+VS = 28V, Vcc = 12V, Ic =2A

2

MI N TYP MAX UNITS

POWER SUPPLY

+VS VOLTAGE +VS Current = Load Current 80 Vdc
Vcc VOLTAGE 9 12 16 Vdc
Vcc CURRENT Vcc = 12Vdc 15 20 mA

THERMAL

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

NOTES: 1. Each of the two active output transistors can dissipate 60W.

CAUTION

3

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.

The SA50 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 SA50 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 SA50. A well laid out PC board with

low impedance copper ground plane is necessary for the
SA50 to function properly. The Apex EK-SA50 evaluation

board is recommended for fast and easy breadboarding of
circuits using the SA50.

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: [phone]

TYPICAL PERFORMANCE
GRAPHS

SA50

60

POWER DERATING

50

INPUT CURRENT VS TEMP

1.05

0.95

0.85

40

30

20

0.75

0.65

0.55

0.45

10

EACH OUTPUT TRANSISTOR

0

INTERNAL POWER DISSIPATION, (W)

CASE TEMPERATURE, T (°C)

EFFICIENCY VS TEMP @ 80V EFFICIENCY VS TEMP @ 20V

100

99

I

98
97

I

OUT

96
95

EFFICIENCY, (%)

94

= 1A, V

OUT

= 5A, V

75

S

= 80V

1000 25 50 125

= 80V

S

C

93
92

–60 180–20 20 60 100 140

JUNCTION TEMPERATURE (°C)

PWM BIAS CURRENT, (µA)

0.35

0.25
–40 120

–20 0 20 40 60 80 100 4 5

CASE TEMPERATURE, (°C)

100

95

I

OUT

= 1A, V

90
85

I

OUT

= 5A, V

80
75

EFFICIENCY, (%)

70
65

–60 180

–20 20 60 100 140

JUNCTION TEMPERATURE (°C)

S

= 20V

= 20V

S

EFFICIENCY CONTOURS

80

(V)

S

70
60
50

97%

95%

40
30

20

SUPPLY VOLTAGE, V

10

0

123

90%

80%

70%

LOAD CURRENT, (A)

EFFICIENCY VS LOAD CURRENT

100

V

= 80V

V

V

S

S

V

= 60V

S

= 40V

S

= 20V

97

94

91

EFFICIENCY, (%)

88

85

12345

LOAD CURRENT, (A)

OUTPUT RESISTANCE DRIFT

2.5

2

1.5

1

0.5

0
–60 180–20 20 60 100 140

OUTPUT RESISTANCE, (NORMALIZED)

JUNCTION TEMPERATURE (°C)

VOLTAGE DROP (BOTH MOSFETS)

5

CASE TEMPERATURE

4

3

2

VOLTAGE DROP, (V)

1

0

051234

85°C

110°C

60°C

35°C

OUTPUT CURRENT, (A)

H-BRIDGE FET CAPACITANCE

500

400

300

200

100

DRAIN-TO-SOURCE CAP, (pF)

0

1 2 5 10 20 50 100
DRAIN-TO-SOURCE VOLTAGE, (V)

QUIESCENT CURRET VS PWM FREQ

15

14

13

12

11

QUIESCENT CURRENT, (mA)

10

0

200

400 600

PWM FREQUENCY (Hz)

QUIESCENT CURRENT VS VOLTAGE

14.0

12.0

10.0

8.0

6.0

4.0

QUIESCENT CURRENT, (mA)

2.0
8 9 10 11 13 1512 14

Vcc VOLTAGE (V)

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SA50

OPERATING

CONSIDERATIONS

GENERAL

Helpful information about power supplies, heatsinking and
mounting can be found in the “General Operating Consider­ations” section of the Apex data book. For information on the
package outline, heatsinks, and mounting hardware see the
“Package Outlines” and “Accessories” section of the data
book. Also see Application Note 30 on “PWM Basics.”

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

- is the higher voltage H-bridge supply. The MOSFETS

S

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. 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 V
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.

RESENSE B - This is the connection for the bottom of the B

half bridge. This can have a sense resistor connection to the
V

return ground for current limit sensing, or can be connected

S

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.

TYPICAL SYSTEM OPERATION

+V

+V

S

3

S

4

2

5
1

RIN

Rf

SNUBBER NETWORK

100Ω

2W

1000pF

200V

+12V

MOTOR

SENSE

RESISTORS

0.1Ω

RDIVIDE
RDIVIDE

RIN

and negative spikes

S

+12V

6

GND

Vcc

MOTOR A

SA50

8

INPUT

MOTOR B

7

GND

RSENSE A
RSENSE B

NO OUTPUT
SWITCHING
CURRENT

CURRENT CONTROL

22µF

R

R

+12V

ANALOG
INPUT

S

This is a diagram of a typical application of the SA50. The
design Vcc voltage is +12 volts and should have a good low
ESR bypass capacitor such as a tantalum electrolytic. 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 V

and the hybrid GND should be large enough to provide

S

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 V

return should not be carrying any motor current. The

S

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 +V
below –2V with respect to pin 7 (GND).

MYLAR

(VCC÷2)

6.8µF
100V
POLY

RDIVIDE = 2X Rf

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.

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: [phone]

SA50U REV. D JANUARY 1998 © 1998 Apex Microtechnology Corp.