APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
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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
INTERNAL PWM GENERATION
APPLICATIONS
BRUSH TYPE MOTOR CONTROL
CLASS D SWITCHMODE AMPLIFIER
REACTIVE LOADS
MAGNETIC COILS (MRI)
ACTIVE MAGNETIC BEARING
VIBRATION CANCELLING
DESCRIPTION
The SA50 is a pulse width modulation amplifier that can sup-
ply 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 amplifica-
tion. The SA50 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
8-PIN TO-3
PACKAGE STYLE CE
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
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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
300C
TEMPERATURE, junction
3
150C
TEMPERATURE, storage
65 to +150C
OPERATING TEMPERATURE RANGE, case
65 to +125C
INPUT VOLTAGE
+1 to Vcc 1.5 Vdc
SA50
SPECIFICATIONS
PARAMETER
TEST CONDITIONS
2
MIN
TYP
MAX
UNITS
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
EFFICIENCY, 5A OUTPUT
+V
S
= 80V
95
%
SWITCHING FREQUENCY
40
45
50
Khz
CURRENT, continuous
5
A
CURRENT, peak
t = 100 msec
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
15
20
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 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 850C to avoid generating toxic fumes.
CAUTION
NOTES: 1. Each of the two active output transistors can dissipate 60W.
2. Unless otherwise noted: T
C
= 25C, 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
= +25C.
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: 1 (800) 546-2739
4
OPERATING
CONSIDERATIONS
SA50
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 applica-
tions. 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 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. 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
S
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
S
return ground for current limit sensing, or can be con-
nected 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
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 0.1 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
S
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 V
S
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 +V
S
and negative spikes
below 2V with respect to pin 7 (GND).
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.
SA50U REV. F JUNE 2002 2002 Apex Microtechnology Corp.
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