NCP1653_09 datasheet(17/19 Pages) ONSEMI

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NCP1653, NCP1653A

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APPENDIX I – SUMMARY OF EQUATIONS IN NCP1653 BOOST PFC

Description

Follower Boost Mode

Constant Output Voltage Mode

Boost Converter

Vout

Vin

t1 ) t2

T * t1

Same as Follower Boost Mode

³ Vout*Vin

Vout

t1 ) t2 +

Input Current Averaged by

Filter Capacitor

Iin + IL * 50

Same as Follower Boost Mode

Nominal Output Voltage (IFB

= 200 mA)

Vout(nom) + IFBRFB ) VFB1

[ IFBRFB + 200 mA @ RFB

Same as Follower Boost Mode

Feedback Pin Voltage VFB1

Please refer to Figure 11.

Same as Follower Boost Mode

Output Voltage

Vin t Vout t 192 mA @ RFB

192 mA @ RFB t Vout t 200 mA @ RFB

Inductor Current

Peak−Peak Ripple

DIL(pk * pk) t 2 @ IL * 50

Same as Follower Boost Mode

Control Current

Icontrol + Icontrol(max) +

Iref

+ 100 mA

Icontrol +

Icontrol(max)

0.04

1 *

Vout

RFBIref

and Icontrol t Icontrol(max) + 100 mA

Switching Frequency

f + 67 or 100 kHz

Same as Follower Boost Mode

Minimum Inductor for CCM

L u L(CRM) +

Vout * Vin

Vout

Vin

DIL(pk * pk)

Same as Follower Boost Mode

Input Impedance

Zin +

RMRCSVacVout

RSR vacIrefVref

Zin +

RM RCS Vac Vout

2RS R vac Icontrol Vref

Input Power

Pin +

RS R vac Iref Vref

RM RCS

Vac

Vout

Pin +

2RSR vacVref

RMRCS

IcontrolVac

Vout

Output Power

Pout + hPin +

hRS R vac Iref Vref

RM RCS

Vac

Vout

Pout +

h2RS R vac Vref

RM RCS

Icontrol Vac

Vout

Maximum Input Power when

Icontrol = 100 mA

Pin(max) + Pin +

RS R vac Iref Vref

RM RCS

Vac

Vout

Circuit will enter follower boost region when

maximum power is reached.

Current Limit

IL(OCP) +

RCS

@ 200 mA

Same as Follower Boost Mode

Power Limit

IL @ VAC t

RCS

Rvac ) 12 kW

@ 3nA2

Same as Follower Boost Mode

Output Overvoltage

Vout(OVP) + 107% @ Vout(nom)

[ 214 mA @ RFB

Same as Follower Boost Mode

Output Undervoltage

Vout(UVP * on) + 8% @ Vout(nom)

[ 16 mA @ RFB

Vout(UVP * off) + 12% @ Vout(nom)

[ 24 mA @ RFB

Same as Follower Boost Mode

Input Voltage Sense Pin

Resistor Rvac

Rvac u 938 kWand R vac +

Rvac ) 12 kW

Same as Follower Boost Mode

PWM Comparator

Reference Voltage

Vref + 2.62 V

Same as Follower Boost Mode

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