apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 features ? single supply operation ? wide supply range 16-100v ? 20a continuous output ? programmable current limit ? shutdown control ? hermetic package ? 2 in 2 footprint applications ? brush type motor control ? peltier control ? reactive loads ? magnetic coils (mri) ? active magnetic bearing ? vibration cancelling description the SA01 ampli?er is a pulse width modulation ampli?er that can supply 2kw to the load. the full bridge output ampli?er can be operated from a single power supply over a wide range of voltages. an error ampli?er is included which can provide gain for the velocity control loop in brush type motor control applications. current limit is programmable by a single resistor. a shutdown input turns off all four drivers of the h bridge output. a precision reference output is provided for use in offsetting the error ampli?er. the error ampli?er can then be scaled for standard input signals. the ampli?er is protected from shorts to supply or ground. the h bridge output mosfets are protected from thermal overloads by directly sensing the temperature of the die. the 10-pin hermetic power package occupies only 2 square inches of board space and is isolated. block diagram typical application ????? ??? ??? ???? ??? ?????? ??????? ??????? ????? ??? ???????? ??????? ? ? ? ? ? ? ? ? ?? ?? ? ????? ????? ? ????? ????? ?????? ? ???????????? ?????? ??? ??? ??? ????????????????????????????????????????????????????????? ???????????????????????????????????????????????? ??? ??? ?????? ??? ??? ????? ?????? ????? ? ????? ?? ? ????? ? ? ? ? ? ?? ? ? ? ? ? ? ? ????? ? ?? ? ????? ? ????? ? ?????? ? ?????? ??? ???? ???? ?? external connections ?? ??? ?? ? ?? ??? ??? ???? ??? ??? ? ? ??? ????? ?????? ? ????? ? ????? ? ?????? ? ?????? ? ??? ? ??? ???? ? ? ? ? ? ? ? ? ? ?? ?? ?? ???? ???? ?? ???? motor driver with tach feedback ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ???????????????????????????????? ???? ???? ??? ??? ? ???????? 10-pin power dip package style de
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 2 absolute maximum ratings specifications absolute maximum ratings supply voltage, +v s 100v output current, peak 30a power dissipation, internal 185w 1 temperature, pin solder - 10s 300c temperature, junction 2 150c temperature, storage C65 to +150c operating temperature range, case C55 to +125c shutdown voltage 10v reference load current 10ma error amp input 0 to +12v SA01 specifications parameter test conditions 2 min typ max units error amp offset voltage 10 mv bias current 5 a offset current 1 a common mode voltage range 4 +2 +8 v common mode rejection, dc 4 75 db slew rate 15 v/s open loop gain 4 75 db gain bandwidth product 2 mhz output total r on .25 ? efficiency, 10a output v s = 100v 97 % switching frequency 35.3 42 48.7 khz current, continuous 4 20 a current, peak 4 30 a reference voltage i ref = 5ma 7.46 7.50 7.54 v voltage vs. temp 4 full temperature range 50 ppm/c output current 5 ma load regulation 4 20 50 ppm/ma line regulation 1 ppm/v power supply voltage full temperature range 16 50 100 v current i out = 0, i ref = 0 76 90 ma current, shutdown i ref = 0 25 ma shutdown trip point .18 .22 v input current 100 na thermal 2 resistance, junction to case full temp range, for each transistor 1.0 c/w resistance, junction to air full temperature range 12 c/w temperature range, case meets full range speci?cations C25 +85 c the SA01 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. caution notes: 1. each of the two active output transistors can dissipate 125w, however the n-channel will be about 1/3 of the total dissipated power. internal connection resistance is .05?. 2. unless otherwise noted: t c = 25c. 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.
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 3 SA01 typical performance graphs ??? ??? ??? ??? ??? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???????????????????? ??????????????? ? ????? ??? ???? ??? ????? ??? ??? ?? ??? ??? ?????????????????????? ?? ? ??????????????????? ???????????? ????????????????? ? ? ? ? ??? ?? ?? ? ? ? ? ?? ?? ?? ?? ?? ?? ??????????????????????????????????? ? ? ? ? ? ? ??????????????????????? ??? ???? ?????????????????????????? ? ?? ??? ??????????????????? ? ?????? ? ?? ?? ????????????????????????? ???????????????????? ? ?? ?? ? ?? ??? ??? ?? ??? ??????????????????????????? ?? ????????????????? ???? ???????????????????????????? ?? ?? ?? ??? ??? ??? ??? ? ?? ?? ?? ??? ??? ??? ??? ?? ?? ?? ??? ???? ?? ? ?? ??? ??? ?? ??? ???? ?? ????????????????? ??????????????????????????????? ???? ??? ??? ? ?????????????????????? ? ????????????????????????????????? ? ?? ?????????????????? ?? ???? ? ?????????????? ? ? ????????????????? ?????????????????? ?????????????? ? ?? ??? ??? ?? ?? ?? ?? ? ? ? ? ??? ?? ??? ?? ??? ?? ????????????????????????????? ??????????????????????? ? ????? ?? ??? ??? ?? ?? ??? ?? ?????????????????????????? ??? ? ?? ?? ??? ? ??????????????????? ? ?????? ??????????????????? ? ?????? ?? ?? ?? ??????????????????????? ?????????????????????????? ?????? ?????? ?????? ?????? ?????? ?????????????????????????? ? ? ??????????????????? ? ?????????? ???????????? ?? ? ?? ? ??????????????????????? ??? ????? ????????????????? ???? ???? ????????????? ? ????????? ????????? ? ???? ?? ??? ????????? ???????????? ????? ????????? ? ? ??????? ???????????????????? ? ? ?????? ? ? ?????? ? ? ?????? ? ? ?????? ? ? ???????? ???? ?????????????????????? ??????????????? ???????????????? ??????????????? ???????????????
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 4 SA01 operating considerations 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 ?lter design; heat sink selection; apexs complete application notes library; technical seminar work - book; and evaluation kits. current limit the current limit function sets a peak limit on current ?ow in pin 8 (isense). this limits load current and also limits current in the event of a short of either output to +vs. this circuit can trip anytime during the conduction period and will hold the output transistors off for the remainder of that conduction period. for proper operation the current limit sense resistor must be connected as shown in the external connection diagram. it is recommended that the resistor be a non-inductive type. load current ?ows in pin 8. no current ?ows in pin 10 (shut - down/?lter) so no error will be introduced by the length of the connection to pin 10. however, the voltage at pin 10 is compared to gnd (pin 4) and an error could be introduced if the grounded end of r limit is not directly tied to pin 4. good circuit board layout practice would be to connect r limit directly between pins 8 and 4. switching noise spikes will invariably be found at pin 8. the amplitude and duration will be load dependent. the noise spikes could trip the current limit threshold which is only 200 mv. r filter and c filter should be adjusted so as to reduce the switching noise well below 200 mv to prevent false current limiting. the sum of the dc level plus the noise peak will de - termine the current limiting value. suggested starting values are c filter = .01f, r filter = 5k. the required value of r limit may be calculated by: r limit = .2 v / i limit where r limit is the required resistor value, and i limit is the maximum desired current. shutdown the shutdown circuitry makes use of the internal current limiting circuitry. the two functions may be externally combined as shown below in figure 1. r limit will normally be a very low value resistor and can be considered zero for this application. r sd and r filter form a voltage divider for the shutdown signal. after a suitable noise ?lter is designed for the current limit adjust the value of r sd to give 317 mv of shutdown signal at pin 10 when the shutdown signal is high. this means pin 10 will reach the 200 mv trip point in about one time constant with low output current and less time as output current increases. the voltage at pin 10 is referenced to pin 4 (gnd). c filter will ?lter both the current limit noise spikes and the shutdown signal. shutdown and current limit operate on each cycle of the internal switching rate. as long as the shutdown signal is high the output will be disabled. protection circuits there are two conditions which will latch all the output transis - tors off. the ?rst of these conditions is activation of the high side current limit. speci?cally, current in pin 7 (+v s ) is monitored. the dc trip level is about 35a and response time about 5us. as actual currents increase the response time decreases. the external fault generally associated with this condition is shorting one of the outputs to ground. however, a load fault can also activate this high side current limit if the current rise time is less than the response time of the ?lter discussed under current limit. the second of these conditions is activation of any of the four output transistor over-temperature sensors at about 165c. ambient temperature, air ?ow, ampli?er mounting problems and all the previously mentioned high current faults contribute to junction temperature. when either of these pro - tection circuits are activated, the root fault must be corrected and power cycled to restore normal operation. dead time there is a dead time between the on and off of each out - put. the dead time removes the possibility of a momentary conduction path through the upper and lower transistors of each half bridge output during the switching interval. during the dead time all output transistors are off. noise or ?yback may be observed at the outputs during this time due to the high impedance of the outputs in the off state. this will vary with the nature of the load. error amplifier the internal error ampli?er is an operational ampli?er. for highest loop accuracy it is best to con?gure the op amp as an integrator (see figure 2). feedback can be adjusted with appropriate poles and zeroes to properly compensate the velocity loop for optimum stability. the op amp is operated from a single supply voltage gener - ated internally. the non-inverting input of the op amp does not have a common mode range which includes ground. r2 and r7 are used with the reference voltage provided at pin 5 to bias the non-inverting input to +5 volts, which is approximately half of the voltage supplied internally to the op amp. similarly, r1 and the parallel combination of r5 r6 are selected to bias the inverting input also at +5 volts. resistors r1 r2 must be matched. likewise the parallel combination of r5 r6 must be matched with r7. the source impedances of the tach and the signal source may affect the matching and should be considered in the design. ?? ? ??????????? ? ????? ? ?????? ? ????? ? ?????? ? ?? ???????? ?????? ????????? ??????? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??????? ??? ??? ? ? ? ? ??????? ?????? ????????? ???? this data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. all speci?cations are subject to change without notice. SA01u rev f september 2002 ? 2002 apex microtechnology corp.
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