IP34063AD 데이터 시트보기 (PDF) - Semelab - > TT Electronics plc
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IP34063AD Datasheet PDF : 5 Pages
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IP35063
IP33063
IP34063
VSAT
VF
Calculation
tON
tOFF
(tON + tOFF)MAX
CT
Ipk(switch)
RSC
L(MIN)
CO
DESIGN FORMULA TABLE
Step–Down
VOUT + VF
VIN(MAX) - VSAT - VOUT
1
fMIN
4 x 10-5 tON
2 IOUT(MAX)
0.33 / Ipk(switch)
VIN(MAX) - VSAT - VOUT
Ipk(switch)
tON(MAX)
Ipk(switch) (tON + tOFF)
8 Vripple(p–p)
KEY
— Saturation voltage of the output switch.
— Forward voltage drop of the ringback rectifier.
Step–Up
VOUT + VF - VIN(MIN)
VIN(MIN) - VSAT
1
fMIN
4 x 10-5 tON
2 IOUT(MAX)
tON + tOFF
tOFF
0.33 / Ipk(switch)
VIN(MIN) - VSAT
Ipk(switch)
tON(MAX)
IOUT tON
Vripple
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
( )R2
—
Desired output voltage, VOUT = 1.25
1+
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 capacitors 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.
Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
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