NCP3063B datasheet(9/16 Pages) ONSEMI

Part #	NCP3063B

Description	1.5 A, Step?뭊p/Down/Inverting Switching Regulators

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP3063, NCP3063B, NCV3063

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9

(See Notes 9, 10, 11)

Step−Down

Step−Up

Voltage−Inverting

ton

toff

Vout ) VF

Vin * VSWCE * Vout

Vout ) VF * Vin

Vin * VSWCE

|Vout| ) VF

Vin * VSWCE

ton

toff

f

ton

toff )

1

ton

toff

f

ton

toff )

1

ton

toff

f

ton

toff )

1

CT

CT +

381.6

@ 10*6

fosc

* 343 @ 10*12

IL(avg)

Iout

ton

toff

) 1

Iout

ton

toff

) 1

Ipk (Switch)

IL(avg) )

DIL

2

IL(avg) )

DIL

2

IL(avg) )

DIL

2

RSC

0.20

Ipk (Switch)

0.20

Ipk (Switch)

0.20

Ipk (Switch)

L

Vin * VSWCE * Vout

DIL

ton

Vin * VSWCE

DIL

ton

Vin * VSWCE

DIL

ton

Vripple(pp)

DIL

1

8 f CO

2

) (ESR)2

[

ton Iout

CO

) DIL @ ESR

[

ton Iout

CO

) DIL @ ESR

Vout

VTH

R2

R1

) 1

VTH

R2

R1

) 1

VTH

R2

R1

) 1

The Following Converter Characteristics Must Be Chosen:

Vin − Nominal operating input voltage.

Vout − Desired output voltage.

Iout − Desired output current.

DIL − Desired peak−to−peak inductor ripple current. For maximum output current it is suggested that DIL be chosen to be

less than 10% of the average inductor current IL(avg). This will help prevent Ipk (Switch) from reaching the current limit threshold

set by RSC. If the design goal is to use a minimum inductance value, let DIL = 2(IL(avg)). This will proportionally reduce

converter output current capability.

f − Maximum output switch frequency.

Vripple(pp) − Desired peak−to−peak output ripple voltage. For best performance the ripple voltage should be kept to a low

value since it will directly affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR)

electrolytic designed for switching regulator applications.

9. VSWCE − Darlington Switch Collector to Emitter Voltage Drop, refer to Figures 5, 6, 7 and 8.

10. VF − Output rectifier forward voltage drop. Typical value for 1N5819 Schottky barrier rectifier is 0.4 V.

11. The calculated ton/toff must not exceed the minimum guaranteed oscillator charge to discharge ratio.

Figure 13. Design Equations

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