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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
APPLICATIONS
* * * * * * BRUSH TYPE MOTOR CONTROL CLASS D SWITCHMODE AMPLIFIER REACTIVE LOADS MAGNETIC COILS (MRI) ACTIVE MAGNETIC BEARING VIBRATION CANCELLING
8-PIN TO-3 PACKAGE STYLE CE TYPICAL APPLICATION

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 voltages. 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

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
SA51
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, INPUT INPUT VOLTAGE, DIS TEST CONDITIONS2 MIN 0 3.6 45 3.6 0 Ids = 5A +VS = 80V T = 100ms +VS = 28V, Vcc = 12V, Ic =2A 5 7 36 170 100 54 250 1.25 0.5 95 TYP 80V5 7A 16V 120W1 300C 150C -65 to +150C -65 to +125C 0 to Vcc 0 to Vcc MAX 0.6 5.0 500 VCC 0.6 1.8 UNITS Vdc Vdc KHz Vdc Vdc Vdc % A A nS nS nS Vdc Vdc mA C/W C/W C
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER INPUT PWM PULSE LOW VOLTAGE PWM PULSE HIGH VOLTAGE PWM FREQUENCY DISABLE ON DISABLE OFF OUTPUT Vds (ON) VOLTAGE, each MOSFET TOTAL Ron, both MOSFETs EFFICIENCY, 5A OUTPUT 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
+VS Current = Load Current Vcc = 12Vdc Full temp range, for each transistor Full temperature range
9.5
12 11 2.0 30
80 15 18
-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 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 850C to avoid generating toxic fumes.
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 * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
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SA51
TYPICAL PERFORMANCE GRAPHS
Typical performance curves with Vcc = 12V, PWM at 45kHZ and case temperature at 25C, unless otherwise specified.

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
SA51
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.
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.
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 +VS and negative spikes below -2V with respect to Pin 5 (GND) of the hybrid.

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. 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).

This data sheet has been carefully checked and is believed to be reliable, SHANNON ROAD * is assumed ARIZONA 85741 omissions. All specifications are subject 1 (800) 546-2739 APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH however, no responsibility TUCSON, for possible inaccuracies*orUSA * APPLICATIONS HOTLINE:to change without notice.
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SA51U REV. F JUNE 2002
(c) 2002 Apex Microtechnology Corp.

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