the msk 4201 is a complete h-bridge hybrid to be used for dc brushed motor control or class d switchmode amplifier. all of the drive/control circtuitry 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 drive circuitry will provide proper deadtime/shoot-through 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 msk 4201 is packaged in a space efficient isolated 8 pin to-3 that can be directly connected to a heatsink. 4707 dey road liverpool, n.y. 13088 (315) 701-6751 m.s.kennedy corp. equivalent schematic typical applications pin-out information 5 6 7 8 gnd input motor a rsense 1 2 3 4 v+ motor b vcc disable iso 9001 certified by desc mil-prf-38534 certified 28 volt 5 amp mosfet h-bridge pwm motor driver/amplifier features: low cost complete h-bridge 28 volt, 5 amp capability, 75 volt maximum rating self-contained smart lowside/highside drive circuitry internal deadtime generation, shoot-through protection output disable/shutdown capability isolated case allows direct heatsinking four quadrant operation, torque control capability available fully screened to mil-h-38534 description: 4201 rev. b 6/00 1
output characteristics vds(on) voltage (each mosfet) instantaneous forward voltage, each mosfet (intrinsic diode) reverse recovery time (intrinsic diode) leakage current, each mosfet logic supply characteristics quiescent logic current input signals characteristics threshold voltage switching characteristics turn-on propagation delay (includes deadtime) turn-off propagation delay rise-time fall-time dead-time i d =2a i s =2a v+=75v v+=70v v+=75v v cc =12v (non-switching) v cc =12v v+=28v, v cc =12v, i c =2a 75v 16v 5a 37a gnd-2v min. to v+ max. 2.6c/w high voltage supply logic supply continuous output current peak output current output voltage range thermal resistance (output switches) 1 2 3 1 2 3 - 1 2 3 1 2 3 1,2,3 4 4 4 4 - absolute maximum ratings v+ v cc i out i pk v out q jc -65c to +150c 300c -25c to +85c -55c to +125c +175c msk 4201b msk 4201 parameter test conditions electrical specifications units min. - - - - - - - - - - - - - 0.8 - - - - - typ. 0.55 - - 0.95 - - - 1.0 - - 11 - - 1.5 160 85 36 170 100 max. 1.0 - - 1.2 - - 240 10 - - 15 - - 2.7 - - - - - min. - - - - - - - - - - - - - 0.8 - - - - - 1 2 3 4 5 notes: 4 4 4 4 4 max. 0.8 1.2 0.60 1.1 0.95 1.25 240 5 10 5 15 15 15 2.7 tbd tbd tbd tbd - typ. 0.55 0.90 0.36 0.95 0.85 1.0 - 1.0 2.0 0.5 11 11 11 1.5 160 85 36 170 100 30 30 30 30 30 v v v v v v ns ua ua ua ma ma ma v ns ns ns ns ns storage temperature range lead temperature range (10 seconds) case operating temperature MSK4201 MSK4201b junction temperature t st t ld t c t j 1 1 group a subgroup 5 3 2 guaranteed by design but not tested. typical parameters are representative of actual device performance but are for reference only. industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise specified. military grade devices ("b" suffix) shall be 100% tested to subgroups 1,2,3 and 4. subgroups 5 and 6 testing available upon request. subgroup 1,4 t a =t c = +25c 2 t a =t c = +125c 3 t a =t c = -55c all ratings: tc= +25c unless otherwise specified 1 2 rev. b 6/00
application notes msk 4201 pin description 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. motor a - is the output pin for one half of the bridge. when the pwm input is high, this output will be pulled up to v+. 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 on the hybrid as possible. motor b - is the output pin for the other half of the bridge. when the pwm input is low, this output will be pulled up to v+. rsense - this is the common connection for the bot- tom of the bridge. this can have a sense resistor con- nection to the v+ return ground for current limit sens- ing, or can be connected directly to ground. the maxi- mum 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 provid- ing the pwm signal to modulate the output switches. the duty cycle can be between 0% (dc low) and 100% (dc high). see typical system operation notes. disable input - is a ttl compatible input for provid- ing a shutdown signal to the hybrid for disabling all four switches in the bridge regardless of the pwm in- put level. a digital 1 disables, a digital 0 enables. rev. b 6/00 3
this is a diagram of a typical application of the msk 4201. the design vcc voltage is +12 volts and should have a good lo w esr bypass capacitor such as a tantalum. 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% d uty cycle (continuous ttl high) will mean full voltage to the motor in the other direction. a 50% duty cycle will hold the motor a t 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 im portant to make the high current traces as wide as possible to keep inductance down. the storage capacitor connected to the v+ and the hybrid should be large enough to provide the high energy pulse without the voltage sagging too far. the storage capacitor shou ld 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 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 to rque 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 net work to suppress any positive spikes above 75v and negative spikes below -2v with respect to pin 5 (gnd) of the hybrid. typical system operation 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 rev. b 6/00 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 MSK4201 MSK4201b industrial military-mil-h-38534 ordering information all dimensions are .01 inches unless otherwise labeled 5
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