4707 dey road liverpool, n.y. 13088 (315) 701-6751 m.s.kennedy corp. iso 9001 certified by dscc 4202rh 70 volt 10 amp rad-hard h-bridge pwm motor driver/amplifier mil-prf-38534 qualified certified to class k features: user adjustable pwm frequency 70 volt, 10 amp capability self-contained smart lowside/highside drive circuitry internal pwm generation, shoot-through protection isolated case allows direct heatsinking on board 5volt rad-hard regulator available fully screened to mil-prf-38534 class k and class h total dose rated to 100k rad logic level high side enable control logic level disable input typical applications rev. a 5/00 1 description: the msk 4202rh is a radiation hardened complete h-bridge hybrid intended for use in dc brushed motor control applications or class d switchmode amplification in space or other severe operating environments. the design will exhibit high resistance to single event effects (see), single event gate rupture (segr), total dose up to 100k rad and neutron tolerance for military applications. all of the drive/control circuitry for the lowside and highside switches are internal to the hybrid, as well as a +5v linear regulator. 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 4202rh is packaged in a space efficient isolated 18 pin power package available in three lead form configurations that can be directly connected to a heatsink. equivalent schematic
rev. a 5/00 1 2 3 4 5 6 notes: v cc = 12v , v+=28v , r sense a,b=ground, ct=n/c, dis=ov, hen=n/c unless otherwise specified guaranteed by design but not tested. typical parameters are representative of actual device performance but are for reference only. devices shall be 100% tested to subgroups 1,2,3,4, and 7. subgroup 5 and 6 testing available upon request. subgroup 1,4,7 t a =t c = +25c 2,5 t a =t c = +125c 3,6 t a = t c = -55c industrial grade devices shall be 100% tested at 25c only. the internal on resistance is for the die only. this should be used for thermal calculations only. 30 30 30 30 30 electrical specifications output characteristics vds(on) voltage (each mosfet) instantaneous forward voltage, each mosfet (intrinsic diode) rds (on) each mosfet leakage current, each mosfet pwm frequency vcc supply characteristics quiescent current +5v out output duty cycle switching characteristics rise-time fall-time dead-time logic control inputs dis input hen input i d =10a i s =10a id =10a tc =125c v+=70v ct=n/c ct=300pf to gnd v in =2.5v i out =0ma i out =100ma v in =2.5v dc both outputs r l =1k a to b r l =1k a to b r l =1k a to b input voltage lo input voltage hi input current (high or low) input voltage lo input voltage hi input current (high or low) 1 2 3 1 2 3 - 1 2 3 4,5,6 4,5,6 1,2,3 1,2,3 1,2,3 4,5,6 - - - 1,2,3 1,2,3 1,2,3 1,2,3 1,2,3 1,2,3 v v v v v v w ua ua ua khz kh z ma v v % ns ns ns v v ua v v ua parameter units max. 1.0 2.0 1.0 1.8 1.9 1.8 0.1 50 500 50 50 tbd tbd 5.1 5.25 60 tbd tbd - 0.8 - 250 0.8 - 250 typ. 0.5 1.0 0.2 tbd tbd tbd 0.075 25 100 25 45 20 20 5.0 5.0 50 75 350 100 - - 100 - - 100 msk 4202rh 3 min. - - - - - - - - - - 40 tbd - 4.9 4.75 40 - - - - 2.0 - - 2.0 - 4 group a subgroup test conditions 2 1 2 2 7 7 - - verify verify - - p/f p/f output a=100% duty cycle high output b = 0% duty cycle low output a=0% duty cycle low output b = 100% duty cycle high v in =5v v in =ov 6 2 22 2 2 2
application notes msk 4202rh pin descriptions rev. a 5/00 3 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. the +5v regulator also gets its supply voltage from this pin. v+ - is the high 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 suffi- cient 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. output a - is the output pin for one half of the bridge. increasing the input voltage causes increasing duty cycles at this output. output b - is the output pin for the other 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 con- nected 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 con- nected directly to ground. the maximum voltage on this pin is 2 volts with respect to gnd. 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. input - is an analog input for controlling the pwm pulse width of the bridge. a voltage higher than 2.5v will pro- duce greater than 50% duty cycle pulses out of output a. a voltage lower than 2.5v will produce greater than 50% duty cycle pulses out of output b. dis - is the connection for disabling all 4 output switches. dis high overrides all other inputs. when taken low, ev- erything functions normally. an internal pullup to vcc will keep dis high if left unconnected. this pin should be grounded if not used. gnd - is the return connection for the input logic and vcc. +5v out- is the output of the internal linear regulator. this pin should be bypassed to gnd using a 4.7f tanta- lum capacitor and a 0.1f ceramic capacitor . this pin can supply up to 500ma of output current for powering other external circuitry, depending on case temperature and input voltage. ct- is a connection to the internal ramp generator. an external capacitor can be connected from this pin to gnd to lower the pwm frequency. the following chart is use- ful to determine a capacitor for a lower pwm frequency. ct (pf) tbd tbd tbd tbd tbd tbd tbd pwm frequency 1kh z 10kh z 15kh z 20kh z 25kh z 35kh z 40kh z absolute maximum ratings 70v 16v 10a 23a gnd-2v min. to v+ max. 500ma 5.5v ov to tbd v+ v cc i out i pk v out i out v in v in -65c to +150c 300c -55c to +125c +175c 2.0c/w 12c/w t st t ld t c t j q jc high voltage supply logic supply continuous output current peak output current output voltage range (+5v regulator) input voltage logic input voltage storage temperature range lead temperature range (10 seconds) case operating temperature junction temperature thermal resistance (output f ets ) (+5vout regulator)
this is a diagram of a typical application of the msk 4202rh. the design vcc voltage is +12 volts and should have a good low esr bypass capacitor such as a tantalum. 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 t he 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 hybrid 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 capacitor as close to hybrid as possible. the connection b etween 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 clo sed 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 70v and negative spikes below -2v with respect to ground. typical system operation rev.a 5/00 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. 8170 thompson rd., cicero, new york 13039-9393 tel. (315) 699-9201 fax (315) 699-8023 rev.a 5/00 5 all dimensions are 0.01 inches unless otherwise labeled ordering information msk4202 h rh u the above example is a military grade class h hybrid with leads bent up. lead configurations s= straight; u= bent up; d= bent down radiation hardened screening blank= industrial; h= mil-prf-38534 class h k= mil-prf-38534 class k general part number
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