FAN100 datasheet(7/21 Pages) FAIRCHILD

Part #	FAN100

Description	Design and Application of Primary-Side Regulation (PSR) PWM Controller

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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AN-6067

APPLICATION NOTE

www.fairchildsemi.com

Rev. 1.0.1 • 1/26/10

7

Frequency Hopping Operation

A frequency hopping function is built in to further improve

EMI system performance. The frequency hopping period is

no longer than 3ms and the PWM switching frequency range

is 42kHz +/- 2.6kHz.

+/- 2.6KHz

44.6KHz

Frequency Hopping Period

3mS

→

39.4KHz

Figure 15. Gate Signal with Frequency Hopping

CV / CC Regulation

Battery chargers are typically designed for two modes of

operation, constant-voltage charging and constant-current

charging. The basic charging characteristic is shown in

Figure 16. When the battery voltage is low, the charger

operates on a constant current charging. This is the main

method for charging batteries and most of the charging

energy is transferred into the batteries. When the battery

voltage reaches its end-of-charge voltage, the current begins

to taper-off. The charger then enters the constant voltage

method of charging. Finally, the charging current continues

to taper-off until reaching zero.

Vo(V)

Io(mA)

CV Regulation

Charging

Sequence

Figure 16. Basic Charging V-I Characteristic

As mentioned in the CV regulation region section, the V

COMV

modulates MOSFET’s on-time and PWM frequency to

provide enough power to the output load. As shown in

Figure 17, as the output load increases, V

COMV gradually

rises until the system shifts into the CC regulation region. At

the same time, V

COMV increases to 4.5V and the MOSEFT’s

on time is controlled by V

COMI. However, when power

system operates in the CC regulation region at a fixed

42kHz frequency, the MOSFET’s on-time is determined by

VCOMI to modulate the output current.

CV Regulation

CC Regulation

Charging Sequence

4.5V

Deep Green Mode

COMV

V

COMI

V

decreasing output impedance

Figure 17. CV/CC Regulation Charging Sequence

Temperature Compensation

The PSR controller has built-in temperature compensation

circuitry to provide constant reliable voltage regulation even

at a different ambient temperature. This internal positive

temperature coefficient (PTC) compensation current is used

to compensate for the temperature due to the forward-

voltage drop of the diode output. Without temperature

compensation, the output voltage is distinctly higher in high

temperatures than in lower temperature condition, as shown

in Figure 18.

o

V

o

I

high temp.

room temp.

after compensation at high temp.

Figure 18. Output V-I Curve with Temperature

Compensation

As shown in Figure 19, the accuracy value of R1 and R2

determines the voltage regulation amount. The suggested

deviation for R1 and R2 is a +/-1% tolerance.

Auxiliary

Winding

Vs

Temperature

Compensation

PTC

PSR

Controller

/

SH

Vref

Figure 19. Temperature Compensation

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