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dc-dc converter control circuits MC34063A features output switch current in excess of 1.5a 2% reference accuracy low quiescent current:2.5ma(typ.) operating from 3v to 40v frequency operation to 100khz active current limiting moisture sensitivity level 3 MC34063Ag is halogen free products application battery chargers nics / switches / hubs adsl modems negative voltage power supplies ordering information description the MC34063A series is a monolithic control circuit delivering the main functions for dc-dc voltage converting. the device contains an intermal temperature compensated reference, comparator, duty cycle controlled oscillator with an active current limit circuit driver and high current output switch. output voltage is adjustable through two external resistors with a 2% reference accuracy. employing a minimum number of external components the MC34063A devices series is designed for step-down, step-up and voltage-lnverting applications. may. 2009 - rev. 1.2 htc device package MC34063Ad MC34063Agd ? 1 ? dip-8 MC34063An sop-8 8 sop/ 8 dip pin configulation comparator inverting input switch emitter timing capacitor ground ipk sense vcc driver collector switch collector 1 2 3 4 8 7 6 5 sop-8 pkg dip-8 pkg
dc-dc converter control circuits MC34063A block diagram thermal data parameter unit thermal resistance junction-ambient ( * ) max ( * ) this value depends from thermal design of pcb on which the device is mounted. absolute maximum ratings parameter value unit power supply voltage comparator input voltage range switch collector voltage switch emitter voltage (vswc=40v) switch collector to emitter voltage driver collector voltage driver collector current switch current power dissipation at t amb =25 (for plastic package ) (for soic package ) operating ambient temperature range storage temperature range absolute maximum rating are those values beyond which damage to the device may occur. functional operation under these condition is not implied. may. 2009 - rev. 1.2 htc t op t stg symbol v ce v dc i dc i sw v cc v ir v swc 100 ? 1.25 w v -0.3 to 40 v ? 2 ? 40 v 0.625 symbol dip-8 sop-8 r thi-amb 100 160 /w -30 to +125 -40 to +150 40 v 40 v 50 v swe p tot 1.5 a 40 v ipk oscillator s r 8 3 6 4 5 7 2 1 q + vcc driver collector ipk sense switch emitter switch collector gn d - 1.25v reference regulator comparator lnverting input comparator q2 q1 timing capacitor
dc-dc converter control circuits MC34063A electrical characteristics (refer to the test circuits, v cc =5v, t a =t low to t high , unless otherwise specified, see note 2) oscillator frequency v pin5 = 0 v ,c t = 1nf ,t a = 25 o c charge current v cc = 5 to 40v ,t a = 25 o c discharge current v cc = 5 to 40v ,t a = 25 o c discharge to charge current ratio pin 7= v cc ,t a = 25 o c current limit sense voltage i chg = i dischg ,t a = 25 o c output switch saturation voltage, i sw = 1a ,pins 1,8 connected darlington connection saturation voltage i sw = 1a ,r pin8 = 82 ? to v cc , forced ~ 20 dc current gain i sw = 1a, v ce = 5v, t a = 25 o c collector off-state current v ce = 40v comparator threshold voltage t a = 25 o c t a = t low to t high threshold voltage line regulation v cc = 3 to 40v input bias current v in = 0v total device supply current v cc = 5 to 40v, c t =1 ? pin7= v cc ,v pin5 >v th , pin2=gnd remaining pins open for MC34063A notes: 1) maximum package power dissipation limit must be observed. 2) t low = '-30 , t high = '+125 3) if darlington configuration is not used, care must be taken to avoid deep saturation of output switch. the resulting switch-off time may be adversely affected. in a darlington configuration the following output driver condition is suggested: forced of output current switch= i coutput /(i cdriver -1 ? * ) 10 * current less due to a built in 1k ? antileakage resistor. may. 2009 - rev. 1.2 htc typ. max. uni t khz symbol parameter ? f osc 24 33 42 test conditions min. ? i chg 24 35 42 i dischg 140 220 260 v ipk(sense) 250 300 350 ? i dischg /i chg 5.2 6.5 7.5 uni t v ce(sat) 1.0 1.3 v symbol parameter test conditions min. 0.45 0.7 typ. max. 0.01 100 v h fe 50 75 v ce(sat) ? symbol parameter test conditions min. typ. max. uni t i c(off) v th 1.225 1.25 1.275 15 v 1.21 1.29 v test conditions min. ? i ib -5 -400 ? reg line typ. max. uni t i cc 1.4 4 ? symbol parameter ? 3 ?
dc-dc converter control circuits MC34063A typical electrical characteristics emitter follower configuration output saturation output switch on-off time vs oscillator voltage vs emitter current timing capacitor common emitter configuration output switch darlington configuration collector emitter saturation voltage vs collector current saturation voltage (v ce ( sat ) ) vs temperature power collector emitter ssturation voltage current limit sense voltage voltage (v i p k ) vs (v ce(sat) ) vs temperature temperature may. 2009 - rev. 1.2 htc ? 4 ? i e (?) 400 800 1.45 v ce (sat) 0 1200 (v) 1.40 1.50 1.55 1.65 1.60 1.70 1.75 0 400 800 1200 1 c (?) v ce (sat) (v) 1.0 0.8 0.6 0.4 0.2 darlington connection v cc =5v pin7=v cc pins2,3,5=gnd t a =25 forced =20 v cc =5v pin1,7,8=v cc pins3,5=gnd t a =25 v ce (sat) 350 550 500 450 400 600 80 40 0 t j () 120 -40 v cc =5v i c =1a v cc =5v i c =1a t on t off (?) 200 150 100 50 0.01 0 0.1 1 c t (?) v cc =5v pin7=v cc pin5=gnd t a =25 (?) v ce (sat) (?) 1000 950 900 850 800 -40 750 0 40 80 120 t j () v ipk (?) 270 280 290 300 310 320 -40 0 40 80 120 t j () MC34063A v cc =5v i chg = i dischg 0 t on t off
dc-dc converter control circuits MC34063A typical electrical characteristics (continued) reference voltage vs temperature bias current vs temperature supply current vs temperature supply current vs input voltage may. 2009 - rev. 1.2 htc ? 5 ? vref (v) 1.240 1.245 1.250 1.255 1.260 1.265 -40 0 40 80 120 t j () v cc =5v i cc (?) 0 1 2 3 4 5 -40 0 40 80 120 t j () v cc =5v c t =1? 1.5 2.0 2.5 3.0 3.5 4.0 0 10 20 40 v in (v) t j = 25 c t = 1? i bias 0 6 8 10 -40 0 40 80 120 t j () v cc =5v c ii to gnd (?) 2 4 (?) 30 i cc
dc-dc converter control circuits MC34063A typical application circuit step-up converter drc swc ipk swe vcc tc v in cii gnd v out 12v 25v/175 ? MC34063A step-down converter drc swc ipk swe vcc tc v in cii gnd 25v MC34063A v out 5v/0.5a may. 2009 - rev. 1.2 htc ? 6 ? c 2 100? + r 1 c 3 1.5? r 3 r sc r 2 d 1 byv10-40 c 1 330? + l 1 8 7 6 5 1 2 3 4 180 0.22 2.2k 44k 170h c 2 100? + r 1 c 3 470? r sc r 2 byv10-40 d 1 c 1 470? + 220h l 8 7 6 5 1 2 3 4 0.33 1.2k 3.5k
dc-dc converter control circuits MC34063A step-up with external npn switch v out v in voltage inverting converter drc swc ipk swe vcc tc v in cii gnd 4.5v to 5v MC34063A v out -12v /100 ? may. 2009 - rev. 1.2 htc ? 7 ? c 2 100? + r 2 c 3 1.5? r 3 r 1 d 1 byv10-40 c 1 1000? + l 1 8 7 6 5 1 2 3 4 0.22 8.2k 953 - + r sc + 1 2 3 4 5 6 7 8 q2 q1 comparator ipk oscillator 1.25v reference regulator 90h s q r
dc-dc converter control circuits MC34063A step-down with external npn switch v out v in step-down with external pnp switch v out v in may. 2009 - rev. 1.2 htc ? 8 ? - + r sc + 2 3 4 5 6 q2 q1 comparator ipk oscillator 1.25v reference regulator 1 8 7 - + r sc + 2 3 4 5 6 7 8 q2 q1 comparator ipk oscillator 1.25v reference regulator 1 s q r s q r
dc-dc converter control circuits MC34063A voltage inverting with external npn switch v out v in voltage inverting with external pnp saturated switch v out v in may. 2009 - rev. 1.2 htc ? 9 ? - + r sc 5 6 7 8 q2 q1 comparator ipk oscillator 1.25v reference regulator 1 + - + r sc q2 q1 comparator ipk oscillator 1.25v reference regulator + s q r s q r 2 3 4 8 7 6 5 4 3 2 1
dc-dc converter control circuits MC34063A dual output voltage +12v gnd -12v v in higher output power, higher input voltage +v out -v out v in may. 2009 - rev. 1.2 htc ? 10 ? r sc 5 q2 q1 comparator ipk oscillator 1.25v reference regulator + + 6 7 8 1 2 3 4 s q r r sc 2 3 4 6 ipk oscillator 1.25v reference regulator 7 7 1 8 5 + + isolated from input s q r comparator - + - +
dc-dc converter control circuits MC34063A design formula table v in(min) - v sat v in(min) - v sat v in + v sat f min f min f min v in(min) - v sat v in(min) -v sat -v out v in(min) - v sat i pk(switch) i pk(switch) i pk(switch) i pk(switch) (t on + t off ) v ripple(pp) 8v ripple(pp) v ripple(pp) terms and definitions v sat - saturation voltage of the output switch. v f - forward voltage drop of the output rectifier. the following power supply characteristics must be chosen: v in - nominal input voltage. v out - desired output voltage. i out - desired output current. f min - minimum desired output switching frequency at the selected values of v in and i o . v ripple(p-p) ? desired peack-to-peack output ripple voltage. in practice the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout. the ripple voltage should be kept to a low value since it will directly affect the line and load regulation. may. 2009 - rev. 1.2 htc ? 11 ? voltage-inverting v out + v f |v out | + v f calculation step-up step-down c o v out + v f - v in(min) 1 r sc c t 0.3 / i pk(switch) () x t on(max) 9 11 t off l (min) () x t on(max) 4.0 x 10 -5 t on 4.0 x 10 -5 t on t on ) () + 1 t off 2i out(max) 2i out(max) ( t on ) x t on(max) ( + 1 i out t on 9 i out t on t on /t off (t on /t off )max 2i out(max) i pk(switch) 4.0 x 10 -5 t on 0.3 / i pk(switch) 0.3 / i pk(switch)

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