0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C

Transcription

1 FEATUE OPEATING FOM TO 0 Low tandby Current Current Limitting Output witch Current to 0.A Output altage Adjustable Operation Frequency up to 0KHz (CT=00pF) Precision % eference OP/ DIP PIN Configulation OP PKG DIP PKG witch Collector Drive Collector witch Emitter Ipk ense Application Battery Chargers NICs / witches / Hubs ADL Modems Negative oltage Power upplies Timing Capacitor Ground cc Comparator Input ODEING INFOMATION Device Package MC0CD OP MC0CN DIP DECIPTION The MC0C is a monolithic switching regulator control circuit containing the primary funtion required for DCDC converters. This device consists of internal temperature compenssated reference, voltage, cotr duty cycle oscillator with active current. The device is specifically designed to be used in tep tepup and oltageinverting applications with a minimum number of external components. The MC0C is the enhanced version of MC0A with the ability to work in higher frequen The 0C is available in pcakages : OP and DIP. Jan. 00ev.0

2 BLOCK DIAGAM Drive Collector s witch Collector Ipk ense witch Emitter Timing Capacitor cc Comparator Comparator lnverting input. eference egulator GND ABOLUTE MAXIMUM ATING (NOTE ) YMBOL cc ir WC WE CE dc I dc I sw PD PΘJA PD PΘJA TJ T stg PAAMETE ALUE UNIT Power upply oltage Comparator input oltage ange witch Collector oltage witch Emitter oltage (WC=0) witch Collector to Emitter oltage Driver Collector oltage Driver Collector Current (NOTE ) witch Current 0 0. to ma A OP Package DIP Package Power Dissipation at T amb = Power Dissipation at T amb =. 0. W W Thermal esistance Thermal esistance 00 0 /W /W Operating Juntion Temperature ange torage Temperature ange 0 to 0 to 0 Absolute Maximum ating are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Jan. 00ev.0

3 ELECTICAL CHAACTEITIC( efer to the test circuits, CC =, T a = 0 to OCILLATO YMBOL PAAMETE TET CONDITION MIN. TYP. MAX. UNIT F OC Frequency pin = 0,C T = 00pF,T a = o KHz I chg Charge Current CC = to 0,T a = o C 0 μa I dischg Discharge Current CC = to 0,T a = o C μa I dischg /I chg Discharge to Charge Current atio Pin = CC,T a = o C... ipk(sense) Current Limit ense oltage I chg = I dischg,t a = o C m OUTPUT WITCH (NOTE ) YMBOL PAAMETE TET CONDITION MIN. TYP. MAX. UNIT aturation oltage,. CE(sat) I W = A,Pins, connected Darlington connection I W = A, pin = Ω to CC, CE(sat) aturation oltage (NOTE ) Forced β ~ 0 h DC Current Gain I W = A, CE =, T a = o FE C 0 I C(off) Collector Offtate Current CE = μa COMPAATO YMBOL PAAMETE TET CONDITION MIN. TYP. MAX. UNIT th Threshold oltage T a = o C... T a = T LOW to T HIGH..9 eg line Threshold oltage Line egulation CC = to 0. m I IB Input Bias Current IN = na TOTAL DEICE YMBOL PAAMETE TET CONDITION MIN. CC = to 0, C T =nf I CC upply Current Pin= CC, pin > th, Pin=GND emaining pins open for MC0C TYP. MAX. UNIT. ma Notes: tresses greater than those listed under "Absolute Maximum atings" may cause permanent damage to the devic These are stress retings only, and functional operation of the device at these or any other conditions beyond thos indicated under "ecommended Operating Conditions" is not implied. Exposure to "Absolute Maximum atings" f extended periods may affect device reliability. Maximum package power dissipation limits must be observed. Low duty cycle pulse technique are used during test to maintain juntion temperature as close to ambient Temperature as possible. If the output switch is driven into hard saturation (nondarlington configuration) at low switch currents ( 00mA) and high driver currents ( 0mA), it may take up to.0μs for it to come out of saturation. This condition will shorten the off time at frequencies 0kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. Jan. 00ev.0

4 TYPICAL PEFOMANCE CHAACTEITIC Jan. 00ev.0

5 TYPICAL APPLICATION CICUIT tepup Converter L 0Ω sc 0.Ω DC WC Ipk WE cc TC IN CII GND C OUT C 00pF /ma 00 μf 0μH MC0C D IN9.KΩ KΩ C 0μF tepdown Converter DC WC Ipk WE cc TC IN CII GND sc 0.Ω C 00 μf MC0C C 0pF IN9 D L 0μH.KΩ.KΩ C OUT /0.A 0 μf Jan. 00ev.0

6 tepup With External NPN witch OUT sc IN. eference egulator oltage Inverting Converter DC WC Ipk WE cc TC IN CII GND. to 0.Ω C 00 μf MC0C C. nf L 0μH D BY00.KΩ 9Ω C 000μF OUT /00 ma Jan. 00ev.0

7 tepdown With External NPN witch sc OUT IN. eference egulator tepdown With External PNP witch OUT sc IN. eference egulator Jan. 00ev.0

8 oltage Inverting With External NPN witch sc OUT IN. eference egulator oltage Inverting With External PNP aturated witch OUT sc IN. eference egulator Jan. 00ev.0

9 Dual Output oltage GND sc IN. eference egulator Higher Output Power, Higher Input oltage Isolated from input OUT OUT IN sc. eference egulator Jan. 00ev.0 9