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DC-DC Converter Control Circuits MC34063A OUTPUT SWITCH CURRENT IN EXCESS OF 1.5A 2% REFERENCE ACCURACY LOW QUIESCENT CURRENT:2.5mA(TYP.) OPERATING FROM 3V TO 40V REQUENCY OPERATION TO 100KHz ACTIVE CURRENT LIMITING 8 SOP/ 8 DIP PIN Configulation Switch 1 Collector Switch 2 Emitter Timing 3 Capacitor Ground 8 7 6 Drive Collector Ipk Sense Vcc Comparator 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. 4 5 - Input ORDERING INFORMATION Device MC34063AD MC34063AN Package 8 SOP 8 DIP BLOCK DIAGRAM Drive Collector 8 s R Q Q2 Q1 1 Switch Collector Ipk Sense 7 Ipk Oscillator 2 3 Switch Emitter Timing Capacitor Vcc 6 Comparator + Comparator lnverting input 1.25V Reference Regulator 4 GND 5 HTC 1 DC-DC Converter Control Circuits ABSOLUTE MAXIMUM RATINGS SYMBOL Vcc Vir VSWC VSWE VCE Vdc Idc Isw Ptot Top PARAMETER 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 Tamb=25(for Plastic Package ) (for SOIC Package ) Operating Ambient Temperature Range MC34063A VALUE 50 -0.3 to 40 40 40 40 40 100 1.5 1.25 0.625 0 to 70 UNIT V V V V V V A W Tstg Storage Temperature Range -40 to 150 Absolute Maximum Rating are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. THERMAL DATA SYMBOL PARAMETER Rthi-amb Thermal Resistance Junction-ambient (*) ( ) This Value depends from thermal design of PCB on which the device is mounted. * Max DIP-8 100 SO-8 160 UNIT /w CONNECTION DIAGRAM (top view) SWC SWE TC GND 4 5 SC11080 PIN CONNECTIONS PIN NO 1 2 3 4 5 6 7 8 SYMBOL SWC SWE TC GND CII Vcc IPK DRC NAME AND FUNCTION Switch Collector Switch Emitter Timing Capactor Ground Comparator lnverting lnput Voltage Supply IPK Sense Voltage Driver Collector 1 8 DRC IPK VCC CII HTC 2 DC-DC Converter Control Circuits MC34063A ELECTRICAL CHARACTERISTICS( Refer to the test circuits, VCC=5V, Ta=TLOW to THIGH, unless otherwise specified, see note 2) OSCILLATOR SYMBOL FOSC Ichg Idischg Idischg/Ichg Vipk(sense) PARAMETER Frequency Charge Current Discharge Current Discharge to Charge Current Ratio Current Limit Sense Voltage TEST CONDITIONS MIN. o Vpin5= 0 V ,CT= 1nF ,Ta= 25 C 24 o 24 VCC= 5 to 40V ,Ta= 25 C o 140 VCC= 5 to 40V ,Ta= 25 C o 5.2 Pin 7= VCC ,Ta= 25 C o 250 Ichg= Idischg ,Ta= 25 C TYP. 33 33 200 6.2 300 MAX. UNIT 42 KHz 42 260 7.5 350 OUTPUT SWITCH SYMBOL PARAMETER VCE(sat) Saturation Voltage, Darlington connection VCE(sat) Saturation Voltage hFE IC(off) DC Current Gain Collector Off-State Current TEST CONDITIONS ISW= 1A ,Pins 1,8 connected ISW= 1A ,Rpin8= 82 to VCC, Forced ~ 20 ISW= 1A, VCE= 5V, Ta= 25oC VCE= 40V MIN. TYP. 1 0.45 50 120 0.01 MAX. UNIT 1.3 V 0.7 V 100 COMPARATOR SYMBOL PARAMETER Vth Threshold Voltage Regline IIB Threshold Voltage Line Regulation Input Bias Current TEST CONDITIONS Ta= 25oC Ta= TLOW to THIGH VCC= 3 to 40V VIN= 0V MIN. TYP. 1.225 1.25 1.21 1 -5 MAX. UNIT 1.275 V 1.29 V 5 -400 TOTAL DEVICE SYMBOL PARAMETER ICC Supply Current TEST CONDITIONS MIN. VCC= 5 to 40V, CT=1 Pin7= VCC ,Vpin5>Vth, Pin2=GND Remaining pins open for MC34063A Ta= 25oC ,CT=1 ,Pin5= 0V for MC34063A TYP. 2.5 MAX. UNIT 4 VSTART-UP Start-up Voltage(note 4) 2.1 V Notes: 1) Maximum package power dissipation limit must be observed. 2) TLOW= 0oC, THIGH 70oC = 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: /(I -1* )10 Forced of output current switch= I COUTPUT CDRIVER * Current less due to a built in 1K antileakage resistor. 4) Start-up Voltage is the minimum Power Supply Voltage at which the internal oscillator begains to work. HTC 3 DC-DC Converter Control Circuits TYPICAL ELECTRICAL CHARACTERISTICS Emitter Follower Configuration Output Saturation Voltage vs Emitter Current VCE(sat) (V) 1.75 1.70 1.65 1.60 1.55 1.50 1.45 1.40 0 400 800 1200 IE() 0 0.01 0.1 1 100 VCC=5V Pin1,7,8=VCC Pins3,5=GND Ta=25 MC34063A Output Switch ON-OFF Time vs Oscillator Timing Capacitor Ton Toff () 200 150 VCC=5V Pin7=VCC Pin5=GND Ta=25 Ton 50 Toff CT() Common Emitter Configuration Output Switch Saturation Voltage vs Collector Current VCE(sat) (V) 1.0 0.8 0.6 0.4 0.2 0 0 400 800 1200 1C() VCC=5V Pin7=VCC Pins2,3,5=GND Ta=25 Forced =20 Darlington Connection Darlington Configuration Collector Emitter Saturation Voltage (VCE(sat) ) vs Temperature VCE(sat) () 1000 950 900 850 800 750 -40 VCC=5V IC=1A 0 40 80 120 TJ() Power Collector Emitter Ssturation Voltage (VCE(sat)) vs Temperature VCE(sat) () 600 VCC=5V 550 500 450 400 350 -40 Current Limit Sense Voltage Voltage (Vipk) vs Temperature Vipk () 320 MC34063A 310 300 290 VCC=5V 280 270 -40 IC=1A Ichg=Idischg 0 40 80 120 TJ() 0 40 80 120 TJ() HTC 4 DC-DC Converter Control Circuits TYPICAL ELECTRICAL CHARACTERISTICS (Continued) Reference Voltage vs Temperature Vref (V) 1.265 VCC=5V 1.260 1.255 1.250 1.245 1.240 -40 8 6 4 2 0 -40 MC34063A Bias Current vs Temperature IBias () 10 VCC=5V CII to GND 0 40 80 120 TJ() 0 40 80 120 TJ() Supply Current vs Temperature ICC () 5 4 3 2 1 0 -40 VCC=5V CT=1 Supply Current vs Input Voltage ICC () 4.0 3.5 3.0 2.5 2.0 1.5 TJ= 25 CT= 1 0 40 80 120 TJ() 0 10 20 30 40 Vin(V) HTC 5 DC-DC Converter Control Circuits TYPICAL APPLICATION CIRCUIT Step-Up Converter L1 170H MC34063A R3 180 8 1 DRC 7 SWC 2 Ipk Rsc 0.22 SWE TC GND 3 D1 BYV10-40 6 Vcc 5 VIN 12V C2 100 + CII 4 C3 1.5 VOUT 25V/175 MC34063A R1 R2 44K 2.2K + C1 330 Step-Down Converter 8 1 DRC Rsc 0.33 SWC 2 BYV10-40 7 Ipk 6 SWE TC GND 3 D1 Vcc 5 VIN 25V C2 100 + CII 4 L C3 470 220H MC34063A R1 R2 3.5K 1.2K + C1 470 VOUT 5V/0.5A HTC 6 DC-DC Converter Control Circuits Step-Up With External NPN Switch MC34063A 8 1 S Q VOUT + Q2 Q1 R 2 7 Rsc VIN 6 comparator Ipk Oscillator 3 + 5 1.25V Reference Regulator 4 Voltage Inverting Converter 8 1 DRC R3 0.22 SWC 2 7 L1 90H Ipk 6 SWE 3 Vcc 5 TC 4 D1 C3 1.5 BYV10-40 VIN 4.5V to 5V C2 100 + CII GND MC34063A R1 VOUT 953 R2 8.2K C1 + 1000 -12V /100 HTC 7 DC-DC Converter Control Circuits Step-Down With External NPN Switch MC34063A 8 1 S Q Q2 Q1 R 2 7 Rsc 6 Ipk Oscillator 3 VOUT + VIN comparator + 5 1.25V Reference Regulator 4 Step-Down With External PNP Switch 8 1 S Q Q2 Q1 R + 2 7 VOUT Rsc VIN 6 comparator Ipk Oscillator 3 + 5 1.25V Reference Regulator 4 HTC 8 DC-DC Converter Control Circuits Voltage Inverting With External NPN Switch MC34063A 8 1 S Q Q2 Q1 R 2 7 Rsc VIN 6 comparator Ipk Oscillator 3 VOUT + + 5 1.25V Reference Regulator 4 Voltage Inverting With External PNP Saturated Switch 8 1 S Q Q2 Q1 R VOUT + 2 7 Rsc VIN 6 comparator Ipk Oscillator 3 + 5 1.25V Reference Regulator 4 HTC 9 DC-DC Converter Control Circuits Dual Output Voltage MC34063A + +12V GND 8 1 + S Q Q2 Q1 -12V R 2 7 Rsc VIN 6 Ipk Oscillator 3 comparator 1.25V + 5 Reference Regulator 4 Higher Output Power, Higher Input Voltage + Isolated from input +VOUT -VOUT 8 1 S Q + R 2 7 VIN Rsc 6 comparator 1.25V Ipk Oscillator 3 + - Reference Regulator 4 5 HTC 10 |
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