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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
8-PIN TO-3 PACKAGE STYLE CE TYPICAL APPLICATION

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 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.
BLOCK DIAGRAM

EXTERNAL CONNECTIONS

APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
SA50
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 120W1 300C 150C -65 to +150C -65 to +125C +1 to Vcc - 1.5 Vdc
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER INPUT ANALOG INPUT VOLTAGES MOTOR A, B = 50% Duty Cycle MOTOR A = 100% Duty Cycle High MOTOR B = 100% Duty Cycle High 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 THERMAL3 RESISTANCE, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case TEST CONDITIONS2 Vcc = 12V 6 8 4 Ids = 5A +VS = 80V t = 100 msec +VS = 28V, Vcc = 12V, Ic =2A 40 5 7 1.25 0.5 95 45 1.8 50 Vdc Vdc Vdc Vdc % Khz A A nS nS nS Vdc Vdc mA C/W C/W C MIN TYP MAX UNITS
36 170 100
54 250
+VS Current = Load Current Vcc = 12Vdc Full temp range, for each transistor Full temperature range
9.5
12 15 2.0 30
80 15 20
-25
+85
NOTES: 1. Each of the two active output transistors can dissipate 60W. 2. Unless otherwise noted: TC = 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 TC = +25C.
CAUTION
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.
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
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SA50

TYPICAL PERFORMANCE GRAPHS

APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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OPERATING CONSIDERATIONS
SA50
TYPICAL SYSTEM OPERATION

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 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. VS - 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 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. RESENSE 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.

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 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).
This data sheet has been carefully checked and is believed to be reliable, SHANNON ROAD * is assumed ARIZONA 85741 * USA * APPLICATIONS are subject 1 (800) 546-2739 APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH however, no responsibility TUCSON, for possible inaccuracies or omissions. All specificationsHOTLINE: to change without notice.
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SA50U REV. F JUNE 2002
(c) 2002 Apex Microtechnology Corp.

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