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ISO 9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
75 VOLT 8 AMP MOSFET H-BRIDGE PWM MOTOR DRIVER/AMPLIFIER
4220
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
FEATURES:
Low Cost Complete H-Bridge 8 Amp Capability, 75 Volt Maximum Rating Self-contained Smart Lowside/Highside Drive Circuitry Internal PWM Generation, Shoot-through Protection Isolated Case Allows Direct Heatsinking Four Quadrant Operation, Torque Control Capability Logic Level Disable Input Logic Level High Side Enable Input for Special Modulation or Function
DESCRIPTION:
The MSK 4220 is a complete H-Bridge circuit to be used for DC brushed motor control or Class D switchmode amplification. All of the drive/control circuitry for the lowside and highside switches are internal to the circuit. 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 MSK 4220 is constructed on a space efficient ceramic coated insulated metal substrate that can be directly connected to a heatsink.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
1 2 3 4 5 6 7 8 9
1
PIN-OUT INFORMATION
HEN Disable N/C Input Ground Ground N/C Vcc Output A 18 17 16 15 14 13 12 11 10 Output B Output B Rsense B Rsense B V+ V+ Rsense A Rsense A Output A
Rev. D 6/00
ABSOLUTE MAXIMUM RATINGS

TC TJ
-25C to +125C +150C

ELECTRICAL SPECIFICATIONS
Parameter OUTPUT CHARACTERISTICS VDS(ON) Voltage
1
All Ratings: Tc= +25C Unless Otherwise Specified
Test Conditions 2 MSK 4220 Min. 40 9 Typ. 1.7 2.0 1.0 45 20 12 6 4 8 72 340 100 Max. 2.5 2.5 280 25 50 25 16 0.8 -135 0.8 -270 108 500 Units
Each MOSFET ID=10A Intrinsic Diode Each MOSFET V+=70V
3
Instantaneous Forward Voltage 1 Reverse Recovery Time 1 Leakage Current PWM Frequency Vcc SUPPLY CHARACTERISTICS Quiescent Bias Current Vcc Voltage Range 1 INPUT SIGNAL CHARACTERISTICS Analog Input Voltage Analog Input Voltage Analog Input Voltage LOGIC CONTROL INPUTS 1
1 1
Each MOSFET IS=10A Intrinsic Diode 3
Analog Input=6VDC
Output A,B=50% Duty Cycle Output A=100% Duty Cycle High Output B=100% Duty Cycle High Input Voltage LO
2.7 2.7 -
Disable Input
Input Voltage HI Input Current (DISABLE=0V) Input Voltage LO
HEN Input SWITCHING CHARACTERISTICS 1 Rise-Time Fall-Time Dead-Time
Input Voltage HI Input Current (HEN=0V) RL=100
NOTES:
1 2 3 Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only. Vcc=+12V unless otherwise specified. Measure using a 300S pulse with a 2% Duty Cycle.
2
Rev. D 6/00

V+ VCC IOUT IPK VOUT JC
High Voltage Supply 75V Logic Supply 16V Continuous Output Current 8A Peak Output Current 14A Output Voltage Range GND-2V min. To V+ max. Thermal Resistance 5.3C/W (Output Switches)
TST TLD
Storage Temperature Range Lead Temperature Range (10 Seconds) Case Operating Temperature MSK4220 Junction Temperature
-65C to +150C 300C
V V nS uA KHz mA V V V V V V uA V V uA nS nS nS
APPLICATION NOTES MSK 4220 PIN DESCRIPTIONS
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 obtain the drive current from this supply pin. The voltage on this pin is limited 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 of the module as possible. OUTPUT A - Is the output pin for one half of the bridge. Decreasing the input voltage causes increasing duty cycles at this output. OUTPUT B - Is the output pin for the other half of the bridge. Increasing the input voltage causes increasing duty cycles at this output. RSENSE A - Is the connection for the bottom of the A half bridge. This can have a sense resistor connection 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. RSENSE B - 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 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. INPUT - Is an analog input for controlling the PWM pulse width of the bridge. A voltage lower than Vcc/2 will produce greater than 50% duty cycle pulses out of OUTPUT A. A voltage higher than Vcc/2 will produce greater than 50% duty cycle pulses out of OUTPUT B. DISABLE - Is the connection for disabling all 4 output switches. DISABLE high overrides all other inputs. When taken low, everything functions normally. An internal pullup to Vcc will keep DISABLE high if left unconnected. HEN - Is the connection for enabling the high side output switches. When taken low, HEN overrides other inputs and the high side switches remain off. When HEN is high everything functions normally. An internal pullup to Vcc will keep HEN high if left unconnected.
3
TYPICAL SYSTEM OPERATION
This is a diagram of a typical application of the MSK 4220. 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 ohm sense resistor to sense 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 module should be large enough to provide the high energy pulse without the voltage sagging too far. A low ESR ceramic capacitor or large polypropylene capacitor will be required. Mount the capacitor as close to the module as possible. The connection between GND and the V+ 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 75V and negative spikes below -2V with respect to ground. Rev. D 6/00
IN
TYPICAL PERFORMANCE CURVES
4
Rev. D 6/00
MECHANICAL SPECIFICATIONS
ESD Triangle Indicates Pin 1.
TORQUE SPECIFICATION: 3 TO 5 IN/LBS. NOTE: ALL DIMENSIONS ARE 0.010 UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
Part Number MSK4220 Screening Level Industrial
4707 Dey Road, Liverpool, New York 13088 Phone (315) 701-6751 FAX (315) 701-6752 www.mskennedy.com
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make changes to its products or specifications without notice, however, and assumes no liability for the use of its products.
M.S. Kennedy Corp.
5
Rev. D 6/00

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