NCP3066MNTXG datasheet(9/20 Pages) ONSEMI

Part #	NCP3066MNTXG

Description	Up to 1.5 A Constant Current Switching Regulator for LEDs with ON/OFF Function

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP3066, NCV3066

http://onsemi.com

9

APPLICATIONS

Figures 15 through 24 show the simplicity and flexibility

of the NCP3066. Two main converter topologies are

demonstrated with actual test data shown below each of the

circuit diagrams. The demo boards have an input for a digital

dimming signal. You can provide a PWM signal to change

the average output current and reduce the LED brightness.

Figure 14 gives the relevant design equations for the key

parameters. Additionally, a complete application design aid

for the NCP3066 can be found at www.onsemi.com.

Parameter

Step−Down

Step−Up

ton

toff

Vout ) VF

Vin * VSWCE * Vout

Vout ) VF * Vin

Vin * VSWCE

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

Ipk (Switch)

IL(avg) )

DIL

2

IL(avg) )

DIL

2

RSC

0.20

Ipk (Switch)

0.20

Ipk (Switch)

L

Vin * VSWCE * Vout

DIL

ton

Vin * VSWCE

DIL

ton

Vripple(pp)

DIL

1

8 f CO

2

) (ESR)2

ton Iout

CO

) DIL

ESR

Iout

Vref

Rs

Vref

Rs

9. VSWCE − Darlington Switch Collector to Emitter Voltage Drop, refer to Figures 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 14. Design Equations

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.

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