AMS34063 データシートの表示（PDF） - Advanced Monolithic Systems Inc

部品番号

コンポーネント説明

メーカー

AMS34063

DC-TO-DC CONVERTER CONTROL CIRCUIT

Advanced Monolithic Systems Inc 

AMS34063

APPLICATION HINTS

Design Formula Table

Calculation

tON

tOFF

(tON + tOFF) MAX

CT

IPK(switch)

Step-Down

VOUT + VF

VIN(MIN) - VSAT - VOUT

1

fMIN

4 x 10-5tON

2IOUT(MAX)

RSC

L(MIN)

CO

0.33/IPK(switch)



VIN(MIN) − VSAT

IPK(switch)

−

VOUT

tON(MAX)

IPK(switch) (tON + tOFF)

8Vripple(P − P)

VSAT = Saturation voltage of the output switch.

VF = Forward voltage drop of the ringback rectifier.

Step-Up

VOUT + VF - VIN(MIN)

VIN(MIN) - VSAT

1

fMIN

4 x 10-5tON

2IOUT(MAX) tON + tOFF 

 tOFF 

0.33/IPK(switch)



VIN(MIN) − VSAT

IPK(switch)

tON(MAX

)

≈ IOUT tON

Vripple

Notes

The following power supply characteristics must be chosen:

VIN – Nominal input voltage. If this voltage is not constant, then use VIN(MAX) for step-down and VIN(MIN) for step-up converter.

VOUT – Desired output voltage,

VOUT =1.25 1 +



R2  .

R1 

IOUT - Desired output current.

fMIN - Minimum desired output switching frequency at the selected values for VIN and IO.

Vripple(P-P) – Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the

capacitor’s equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will

directly effect the line and load regulation.

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

Share Link: