general description the SP7500 incorporate on a single monolithic chip all the f unctions required in the construction of a pulse-w idth- modulation control circuit. designed primarily for power supply control ,these devices offer the systems engineer the flexibility to tailor the power supply control circuitry to hos applicat ion. the SP7500 contains an error amplifier , anon-chip adjustable oscillator ,a dead- time control comparator ,pulse-steeri ng control flip-flop ,a 5-volt, 1% precision r egulator , and output-control circuits. the error amplifier exhibits a common-mode voltage range from -0.3 volts to vcc -2 volts .the dead time control comparator has a fixed offset that provides approximately 5% deed time when externally altered. the on-chip oscillator may be bypassed by terminating rt (pin 6) to the reference output and prov iding a sawtooth input to ct (pin 5) ,or it may be used to drive the common circuits in synchronous multiple-rail power supplies . the uncommitted output transistors provide either common circuits in synchronous power supplier. the uncommitted output transistors provid e either common-emitter or emitter-follower output capability .each device provides for push-pull or single-ended output operation, which may be selected through the output - control function . the architecture of these devices prohibits t he possibility of either output being pulsed tw ice during push-pull operation. features ? complete pwm power control circuitry . ? uncommitted outputs for 200 ma sink or source current ? output control selects singel-ended or push-pull operation ? internal circuitry prohibits double pulse at either output ? variable dead-time provides control over total range internal ? regulator provides a stable 5-v reference supply ,1% ? circuit architectureallows easy synchronization ? package outline: dip16 SP7500 1 of 8 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
block diagram absolute maximum ratings over operating free-air temerature range (unless otherwise) rating value unit supply voltage ,vcc 42 v amplifier input voltage vcc+0.3 collector output voltage 41 collector output current 250 ma operating free-air tem perature range 0 to 70 c storage temperature range -65 to 150 lead temperature 1,6 mm from case for 10 seconds 260 SP7500 2 of 8 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
recommended operating conditions parameter value unit min max supply voltage ,vcc 7 40 v amplifier input voltage,vi -0.3 vcc-2 collector output voltage,vo 40 collector output current(each transistor) 200 ma current into feedback terminal 0.3 timing capacitor ,ct 0.0047 10 f timing resistor ,rt 1.8 500 k ? oscillator frequency 1 200 khz operating free-air temperature ,ta 0 70 c electrical characteristics over operating free-air temerature range, vcc=15v,f=10khz (unless otherwise noted) parameter test conditions value unit min typ** max output voltage(vref) io=1ma 4.9 5 5.1 v io=1ma,ta=25 c**** 4.95 5 5.05 line regulation vcc=7v to 40v 2 25 mv load regulation io=1ma to 10ma 1 15 short-circuit output current*** vref=0 10 35 50 ma oscillator section (see figure 1) parameter test conditions* value unit min typ** max frequency ct=0.01 f,rt=12k ? ,ta=25 c 9.2 10 10.8 khz frequency ct=0.01 f,rt=12k ? 9.0 - 12 frequency change with temperature ***** ct=0.01 f,rt=12k ? ta=min to max 2 SP7500 3 of 8 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
amplifier section (see figure 2) parameter test conditions* value unit min typ** max input offset voltage vo(pin 3)=2.5v 2 10 mv input offset current vo(pin 3)=2.5v 25 250 na input blas current vo(pin 3)=2.5v 0.2 1 a common-mode input voltage range vcc=7v to 40v -0.3 to vcc-2 v open-loop voltage amplification vo=3v,rl=2k ? , 70 95 db unity-gain bandwidth 650 khz output section parameter test conditions* value unit min typ** max collector off-state current vce=40v,ccc=40v 2 100 a emitter off-state current vcc=vc=40v,ve=0 -100 collector-emitter saturation voltage collector-emitter ve=0,ic=200ma 1.1 1.3 v emitter-follower vc=15v,ie=-200ma 1.5 2.5 output control input current vi=vref 3.5 ma dead -time control - section(see figure1) parameter test conditions* value unit min typ** max input bias current (pin 4) vi=0 to 5.25v -2 -10 a maximum duty cycle, each output vi(pin 4)=0,o.c.=vref 45 % input threshold voltage (pin 4) zero duty cycle 3 3.3 maximum duty cycle 0 v p m comparator section(see figure 1) parameter test conditions* value unit min typ** max input threshold voltage(pin 3) zero duty cycle 4 4.5 v input sink current (pin 3) v(pin 3)=0.7v 0.3 0.7 ma SP7500 4 of 8 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
total device parameter test conditions* value unit min typ** max standby supply current pin 6 at vref vcc=15v 6 10 ma switching characteristics, ta= 25 c parameter test conditions value unit min typ** max output voltage rise time common-emitter configuration, see figure 3 100 200 ns output voltage fall time 25 100 output voltage rise time emitter-follower configuration. see figure 4 100 200 output voltage fall time 25 100 *for conditions shown as min or ma x, use the appropriate va lue specified under recommend ed operating conditions. **all typical values except for parameter changes with temperature are at ta=25 c ***duration of the short-circui t should not exceed one second ****this is guaranteed where the marking code on the package surface is a *****temperature coefficient of timing capacito r and timing resistor not taken into account. parameter measurement information SP7500 5 of 8 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
figure 1. operational test circuit and waveforms figure 2.amplifier characteristics SP7500 6 of 8 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
figure 3. common - emitter configuration SP7500 7 of 8 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
typical application ordering information orderi ng num ber package m ar k ing SP7500 dip-16 SP7500 SP7500 8 of 8 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
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