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 4707 dey road liverpool, n.y. 13088 (315) 701-6751 m.s.kennedy corp. iso 9001 certified by dscc 75 volt 8 amp mosfet h-bridge pwm motor driver/amplifier 4222 features: low cost complete h-bridge 8 amp capability, 75 volt maximum rating self-contained smart lowside/highside drive circuitry internal 250khz 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 the msk 4222 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 250khz 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 4222 is constructed on a space efficient ceramic coated insulated metal substrate that can be directly connected to a heatsink. description: equivalent schematic typical applications pin-out information 1 2 3 4 5 6 7 8 9 hen disable n/c input ground ground n/c vcc output a rev. b 6/00 1
75v 16v 8a 14a gnd-2v min. to v+ max. 5.3c/w output characteristics vds(on) voltage instantaneous forward voltage reverse recovery time leakage current pwm frequency vcc supply characteristics quiescent bias current vcc voltage range input signal characteristics analog input voltage analog input voltage analog input voltage logic control inputs switching characteristics rise-time fall-time dead-time high voltage supply logic supply continuous output current peak output current output voltage range thermal resistance (output switches) absolute maximum ratings v+ v cc i out i pk v out q jc -65c to +150c 300c -25c to +125c +150c t st t ld t c t j disable input hen input each mosfet i d =10a each mosfet i s =10a intrinsic diode intrinsic diode each mosfet v+=70v analog input=6v dc output a,b=50% duty cycle output a=100% duty cycle high output b=100% duty cycle high input voltage lo input voltage hi input current (disable=0v) input voltage lo input voltage hi input current (hen=0v) r l =100 w parameter electrical specifications units v v ns ua khz ma v v v v v v ua v v ua ns ns ns all ratings: tc= +25c unless otherwise specified 1 1 1 1 1 max. 2.5 2.5 280 25 275 60 16 - - - 0.8 - -135 0.8 - -270 108 500 - msk 4222 typ. 1.7 2.0 - 1.0 250 43 12 6 4 8 - - - - - - 72 340 100 min. - - - - 225 - 9 - - - - 2.7 - - 2.7 - - - - test conditions 2 1 rev. b 6/00 2 1 1 3 3 storage temperature range lead temperature range (10 seconds) case operating temperature MSK4222 junction temperature 1 2 3 notes: 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.
application notes in 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. output b - is the output pin for the other half of the bridge. increasing the input voltage causes increasing duty cycles at this output. output a - is the output pin for one half of the bridge. decreasing 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 out- put 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. this is a diagram of a typical application of the MSK4222. 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 sepa- rately. 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 induc- tance in the power loop. it is important to design the snub- ber network to suppress any positive spikes above 75v and negative spikes below -2v with respect to ground. 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 volt- age transients, and to ensure removing any drooping during switching, should be done as close to the pins of the module as possible. msk 4222 pin descriptions typical system operation rev. b 6/00 3
typical performance curves rev. b 6/00 4
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. mechanical specifications m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com screening level part number MSK4222 industrial ordering information note: all dimensions are 0.010 unless otherwise labeled. torque specification: 3 to 5 in/lbs. esd triangle indicates pin 1. rev. b 6/00 5
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