MC34063E 데이터 시트보기 (PDF) - STMicroelectronics

부품명

상세내역

제조사

MC34063E

DC-DC CONVERTER CONTROL CIRCUITS

STMicroelectronics 

MC34063A/E

Calculation

Parameter

Step-Up

(Discontinuos mode)

Step-Down

(Continuos mode)

Voltage Inverting

(Discontinuos mode)

ton/toff

Vout + VF − Vin(min)

Vin(min) − Vsat

Vout + VF

Vin(min) − Vsat− Vout

| Vout| + VF

Vin − Vsat

(ton + toff)max

CT

1/fmin

4.5x10-5ton

1/fmin

4.5x10-5ton

1/fmin

4.5x10-5ton

IPK(switch)

2Iout(max)[(ton/toff)+1]

2Iout(max)

2Iout(max)[(ton/toff)+1]

RSC

CO

0.3/IPK(switch)

≅

Iout ton

Vripple (p−p)

0.3/IPK(switch)

IPK (switch) (ton + toff )

8Vripple (p−p)

0.3/IPK(switch)

≅

Iout ton

Vripp le (p−p)

L(min)

Vin(min) − Vsat

IPK (switch)

ton

(max)

Vin(min) − Vsat −

IPK (switch)

Vo u t

ton

(m a x)

Vin(min) −

IPK (swit

Vsat

c h)

ton

(ma

x

)

NOTES:

Vsat = Saturation voltage of the output switch

VF = Foward voltage drop of the output rectifier

THE FOLLOWING POWER SUPPLY CHARACTERISTICS MUST BE CHOSEN:

Vin = Nominal input voltage

Vout = Desired output voltage, |Vout| = 1.25(1+R2/R1)

Iout = Desired output current

fmin = Minimum desired output switching frequency at the selected values of Vin and Io

Vripple = Desired peak to peak output ripple voltage. In practice, the calculaed 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

9/15

Share Link: