datasheet: pdf - Farnell

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MC34063A/E Voltage Inverting Converter Printed Demoboard Test Condition (V OUT = -12V) Test Conditions Value (Typ.) Unit Line Regulation VIN = 4.5 to 6 V, IO = 100 mA 15 mV Load Regulation VIN =5V, IO =10to100mA 20 mV Output Ripple VIN =5V, IO = 100 mA 230 mV Efficiency VIN =5V, IO = 100 mA 58 % ISC VIN =5V, RLOAD =0.1Ω 0.9 A 8/16 PIN 1 = V OUT PIN 2 = GND PIN 3 = GND PIN 4 = V IN
Calculation Parameter Step-Up (Discontinuous mode) MC34063A/E NOTES: 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, |V OUT | = 1.25(1+R 2 /R 1 ) I OUT = Desired output current f MIN = Minimum desired output switching frequency at the selected values of V IN and I O V RIPPLE = Desired peak to peak output ripple voltage. In practice, the calculated capacitor value will and 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. Step-Up With External NPN Switch Step-Down (Continuous mode) Voltage Inverting (Discontinuous mode) ton/toff (ton +toff) max 1/fmin 1/fmin 1/fmin CT 4.5x10-5ton 4.5x10-5ton 4.5x10-5 VOUT + VF – VIN( min) ------------------------------------------------------- VIN( min) – Vsat VOUT + VF ----------------------------------------------------------- VIN( min) – Vsat – VOUT VOUT + VF ------------------------------ VIN – Vsat ton IPK(switch) 2Iout(max)[(ton/toff)+1] 2Iout(max) 2Iout(max)[(ton/toff)+1] RSC 0.3/IPK(switch) 0.3/IPK(switch) 0.3/IPK(switch) CO Ioutton ------------------------------- Vripple( p – p) IPK( switch) ( ton + toff) ----------------------------------------------------- 8Vripple( p – p) Ioutton ------------------------------- Vripple( p – p) L (min) VIN( min) – Vsat -------------------------------------- × t I on( min) PK( switch) VIN( min) – Vsat – Vout ------------------------------------------------------- × t I on( min) PK( switch) VIN( min) – Vsat -------------------------------------- × t I on( min) PK( switch) 9/16
Page 1 and 2: ■ OUTPUT SWITCH CURRENT IN EXCESS
Page 3 and 4: ORDERING CODES (*) The "A" version
Page 5 and 6: Figure 5 : Power Collector Emitter
Page 7: Step-Down Converter Printed Demoboa
Page 11 and 12: Voltage Inverting With External NPN
Page 13 and 14: DIM. Plastic DIP-8 MECHANICAL DATA
Page 15 and 16: DIM. Tape & Reel SO-8 MECHANICAL DA

datasheet: pdf - Farnell

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