apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 features ? igbt outputs ? wide supply range16-450v ? 20a to 100c case ? 3 protection circuits ? synchronized or external oscillator ? flexible frequency control applications ? motors ? reactive loads ? magnetic bearings ? large piezo elements ? off-line drivers ? c-d weld controller description the SA08 is a pulse width modulation ampli?er that can supply 9kw to the load. an internal oscillator requires no external components. the clock input stage divides the oscil - lator frequency by two, which provides the switching frequency of 22.5 khz. the oscillator may also be used to synchronize multiple ampli?ers. current sensing is provided for each half of the bridge giving amplitude and direction data. a shutdown input turns off all four drivers of the h-bridge output. a high side current limit and the programmable low side current limit protect the ampli?er from shorts to supply or ground in addition to load shorts. the h-bridge output igbts are protected from thermal overloads by directly sensing the temperature of the die. the 12-pin hermetic mo-127 power package occupies only 3 square inches of board space. block diagram and typical application motor torque control external connections ??? ???? ?????? ??????? ???? ???? ??? ????????? ???????? ????? ??? ??? ? ? ????? ????????? ? ? ? ? ? ? ?? ?? ?? ? ? ? ??? ???? ???????????????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????? ?????????????????????????????????????? ???????????????????????????????????????????????????????? ?????????? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ????????????????????????????????? ???? ?? ? ????? ????? ????????? ????????? ????????? ?????? ?????? ????? ??? ?????? ??????? ?????? ??????? ???? ???? ??? ?? ?? ???????? ??????? ?????? ??????? ??? ??? ?? ?? ?? ????? ????? ? ? ??? ??????? ????? ? ? ? ?? ? ? ? ? ?? ?? ? ? 12-pin power dip package style cr
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 2 parameter test conditions 2 min typ max units clock (clk) clk out, high level 4 i out 1ma 4.8 5.3 v clk out, low level 4 i out 1ma 0 .4 v clk in, low level 4 0 .9 v clk in, high level 4 3.7 5.4 v frequency 44.10 45.00 46.90 khz analog input (+pwm) center voltage 5 v p-p voltage 0/100% modulation 4 v flag flag, high level 10 v flag, low level 0 v output total drop i = 20a 5.4 v efficiency, 20a output v s = 380v 98 % switching frequency osc in 2 22.05 22.50 22.95 khz current, continuous 4 100c case 20 a current, peak 4 28 a power supply voltage, v s full temperature range 16 5 240 450 v voltage, v cc full temperature range 14 15 16 v current, v cc i out = 0 80 ma current, v cc, shutdown 50 ma current, v s no load 90 ma i lim /shutdown trip point 90 110 mv input current 100 na thermal 3 resistance, junction to case full temperature range, for each die 1 c/w resistance, junction to air full temperature range 12 c/w temperature range, case meets full range speci?cations C25 +85 c absolute maximum ratings specifications SA08 absolute maximum ratings supply voltage, +v s 450v supply voltage, v cc 16v power dissipation, internal 1 250w temperature, pin solder - 10s 300c temperature, junction 2 150c temperature, storage C65 to +150c operating temperature range, case C55 to +125c input voltage, +pwm 0 to +11v input voltage, i lim 0 to +10v the SA08 is constructed from static sensitive components. 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. 2. unless otherwise noted: t c = 25c, v s , v cc at typical speci?cation. 3. long term operation at the maximum junction temperature will result in reduced product life. derate internal power dis - sipation to achieve high mttf. for guidance, refer to the heatsink data sheet. 4. guaranteed but not tested. 5. if 100% duty cycle is not required v s(min) = 0v. specifications
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 3 typical performance graphs SA08 ??? ??? ? ?? ?? ?? ??? ??? ?? ?? ?? ?? ??? ??? ??? ??? ?? ???? ?? ?? ?? ??? ????????????? ?? ?? ??? ????????????????????????? ?????????????????????? ?????????????????????????? ?????????????????????????? ??????????????? ? ?? ?? ?? ?? ??? ????????????????? ? ? ? ? ? ????????????????????? ????????????????????????????????????? ????? ????? ????????????????? ????????? ???????????? ?????? ????????? ???????? ????????? ??? ?????????????????????? ????????????????????????? ????????????????????????? ??? ? ?? ?? ?? ??? ??? ???? ???? ???? ???? ??? ????? ????? ????? ????? ????????????????????? ????????????????????????????????? ??? ??????????????????????????????? ????????????? ???????????????????? ?? ?? ?? ??? ??? ?? ?? ?? ?? ??????????????? ?? ??? ??? ??? ??? ??? ? ? ??? ??? ??? ??? ??? ?? ?? ?? ?? ??????????????????????? ???????????????????? ?? ? ?? ??? ?????????????????????? ? ?????????????? ?? ?? ??? ?? ?? ?? ??? ??? ??????????????????????????????? ???????????????????????????? ??????? ?? ?? ?? ?? ??? ?? ?? ??? ??? ??? ??????????????????????? ? ?? ???????????????????????????? ?? ?? ?? ?? ?? ????????????????????????? ???????????????????????????????????? ???????????????????????????????????? ??? ?? ?? ?? ??????????? ????????????????? ? ? ? ?? ?? ?? ????????????????????? ? ? ? ? ? ?????????????????? ??????????????????????? ????? ?????????? ????????? ???? ???????????????? ?? ? ? ? ?? ??
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 4 adjusted so as to reduce the switch - ing noise well below 100 mv to prevent false current limit - ing. the sum of the dc level plus the noise peak will de - termine the current limiting value. as in most switching circuits it may be difficult to deter - mine the true noise amplitude without careful attention to grounding of the oscilloscope probe. use the shortest possible ground lead for the probe and connect exactly at the gnd terminal of the ampli?er. suggested starting values are c filter = .1uf, r filter = 5k . the required value of r limit in voltage mode may be cal - culated by: r limit = .1 v / i limit where r limit is the required resistor value, and i limit is the maximum desired current. in current mode the required value of each r limit is 2 times this value since the sense voltage is divided down by 2 (see figure b). if r shdn is used it will further divide down the sense voltage. the shutdown divider network will also have an effect on the ?ltering circuit. bypassing adequate bypassing of the power supplies is required for proper operation. failure to do so can cause erratic and low ef?ciency operation as well as excessive ringing at the out - puts. the vs supply should be bypassed with at least a 1f ceramic capacitor in parallel with another low esr capacitor of at least 10f per amp of output current. capacitor types rated for switching applications are the only types that should be considered. the bypass capacitors must be physically connected directly to the power supply pins. even one inch of lead length will cause excessive ringing at the outputs. this is due to the very fast switching times and the inductance of the lead connection. the bypassing requirements of the vcc supply are less stringent, but still necessary. a .1f to .47f ceramic capacitor connected directly to the vcc pin will suf?ce. startup conditions the high side of the igbt output bridge circuit is driven by bootstrap circuit and charge pump arrangement. in order for the circuit to produce a 100% duty cycle inde?nitely the low side of each half bridge circuit must have previously been in the on condition. this means, in turn, that if the input signal to the SA08 at startup is demanding a 100% duty cycle, the output may not follow the command and may be in a tri-state condition. the ramp signal must cross the input signal at some point to correctly determine the output state. after the ramp crosses the input signal level one time, the output state will be correct thereafter. operating considerations SA08 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. clock circuit and ramp generator the clock frequency is internally set to a frequency of ap - proximately 45khz. the clk out pin will normally be tied to the clk in pin. the clock is divided by two and applied to an rc network which produces a ramp signal. an external clock signal can be applied to the clk in pin for synchronization purposes, but must be 45 khz +/- 2%. flag output whenever the SA08 has detected a fault condition, the ?ag output is set high (10v). when the programmable low side cur - rent limit is exceeded, the flag output will be set high. the flag output will be reset low on the next clock cycle. this re?ects the pulse-by-pulse current limiting feature. when the internally-set high side current limit is tripped or the thermal limit is reached, the flag output is latched high. see pro - tection circuits below. protection circuits a ?xed internal current limit senses the high side current. should either of the outputs be shorted to ground the high side current limit will latch off the output transistors. the temperature of the output transistors is also monitored. should a fault con - dition raise the temperature of the output transistors to 165c the thermal protection circuit latch off the output transistors. the latched condition can be cleared by either recycling the v cc power or by toggling the i limit/shdn input with a 10v pulse. see figures a and b. the outputs will remain off as long as the shutdown pulse is high (10v). current limit there are two load current sensing pins, i sense a and i sense b. the two pins can be shorted in the voltage mode connection but both must be used in the current mode connec - tion (see ?gures a and b). it is recommended that r limit resistors be non-inductive. load current ?ows in the i sense pins. to avoid errors due to lead lengths connect the i limit/shdn pin directly to the r limit resistors (through the ?lter network and shutdown divider resis - tor) and connect the r limit resistors directly to the gnd pin. s w i t c h i n g n o i s e spikes will invariably be found at the i sense pins. the noise spikes could trip the current limit threshold which is only 100 mv. r filter and c filter should be ????????? ????????? ???????????? ? ??????? ? ??????? ? ?????? ?????? ???????? ?????? ?? ???????????????????????????? ?????????????????????? ????? ????????? ????????? ???????????? ? ??????? ? ??????? ?????? ????? ???????? ?????? ?? ?? ???????????????????????????? ?????????????????????? ? ?????? ? ?????? 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. SA08u rev d october 2004 ? 2004 apex microtechnology corp.
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