FAN102 datasheet(7/21 Pages) FAIRCHILD

No de pièce	FAN102

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

Download	21 Pages

Scroll/Zoom	100%

Fabricant	FAIRCHILD [Fairchild Semiconductor]

Site Internet	http://www.fairchildsemi.com

Logo

7 / 21 page

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

Numéro de pièce similaire - FAN102

Fabricant	No de pièce	Fiches technique	Description
Fairchild Semiconductor	FAN102	959Kb / 14P	Primary-Side-Control PWM Controller
	FAN102	974Kb / 16P	Primary-Side-Control PWM Controller
	FAN102MY	959Kb / 14P	Primary-Side-Control PWM Controller
	FAN102MY	974Kb / 16P	Primary-Side-Control PWM Controller
	FAN102	974Kb / 16P	Primary-Side-Control PWM Controller

More results

Description similaire - FAN102

Fabricant	No de pièce	Fiches technique	Description
Fairchild Semiconductor	FAN103	667Kb / 16P	Primary-Side-Regulation PWM Controller (PWM-PSR)
ON Semiconductor	FL663	406Kb / 15P	Primary-Side-Regulation PWM Controller June 2015 Rev. 1.0
Fairchild Semiconductor	FAN103	952Kb / 16P	Primary-Side-Regulation PWM Controller
List of Unclassifed Man...	DP2525	490Kb / 11P	Low Cost Primary Side Regulation(PSR) PWM Power Switch Rev.2.0
ON Semiconductor	FL7740	657Kb / 16P	Constant-Voltage Primary-Side-Regulation PWM Controller April 2017 - Rev. P0
	FL6630	453Kb / 14P	Single-Stage Primary-Side-Regulation PWM Controller May 2015 Rev. 1.0
	FL7740	344Kb / 14P	Constant-Voltage Primary-Side-Regulation PWM Controller February 2018 - Rev. 3
	FL7734	380Kb / 14P	Single-Stage Primary-Side-Regulation PWM Controller November 2014 Rev. 1.0
	FL7730	896Kb / 15P	Single-Stage Primary-Side-Regulation PWM Controller October 2012 Rev. 1.0.8
	FAN1080M6X	415Kb / 19P	Offline Primary-Side-Regulation (PSR) Quasi-Resonant Valley Switch Controller June, 2019 ??Rev. 2

More results

FAN102 Fiches technique(PDF) 7 Page - Fairchild Semiconductor

FAN102 Fiches technique(HTML) 7 Page - Fairchild Semiconductor

Numéro de pièce similaire - FAN102

Description similaire - FAN102

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Fiches technique Télécharger

Lien URL