SG6903SZ Fairchild Semiconductor, SG6903SZ Datasheet

SG6903SZ

Manufacturer Part Number

SG6903SZ

Description

IC PFC CONTROLLER 16SOIC

Manufacturer

Fairchild Semiconductor

Datasheet

1.SG6903SZ.pdf (19 pages)

Specifications of SG6903SZ

Mounting Type

Surface Mount

Package / Case

16-SOIC (3.9mm Width)

Output Voltage

1.5 V to 8 V

Switching Frequency

65 KHz

Operating Temperature Range

- 20 C to + 85 C

Mounting Style

SMD/SMT

Duty Cycle (max)

83 %

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Supply

Operating Temperature

Frequency - Switching

Mode

Current - Startup

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Current page: 1 of 19
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Green Mode PFC/Flyback-PWM Controller

FEATURES OVERVIEW

APPLICATIONS

Switching Power Suppliers with Active PFC

High-Power Adaptors

DESCRIPTION

for power supplies consist of boost PFC and flyback

PWM. It requires very few external components to

achieve green-mode operation and versatile protections. It

is available in 16-pin SOP packages.

TYPICAL APPLICATION

Version 1.0.1 (IAO33.0061.B0)

Interleaved PFC/PWM switching

Green-mode PFC and PWM operation

No switching of PFC at light loads for best power

saving

Low start-up and operating current

Innovative switching-charge multiplier-divider

Multi-vector control for improved PFC output

transient response

Average-current-mode Control for PFC

Programmable two-level PFC output voltage

PFC over-voltage and under-voltage protections

PFC and PWM feedback open-loop protection

Cycle-by-cycle current limiting for PFC/PWM

Slope compensation for PWM

Constant power limit for PWM

Brownout protection

The highly integrated SG6903 is specially designed

- 1 -

synchronizes the PFC and PWM stages and reduces

switching noise. At light loads, the switching frequency is

continuously decreased to reduce power consumption. If

output loading is further reduced, the PFC stage is turned

off to further reduce power consumption.

scheme provides a fast transient response in a

low-bandwidth PFC loop, in which the overshoot and

undershoot of the PFC voltage are clamped. If the

feedback loop is broken, the SG6903 will shut off PFC to

prevent extra-high voltage on output. Programmable

two-level output voltage control will reduce the PFC

output voltage at low line input to increase the efficiency

of the power supply.

compensation ensures the stability of the current loop

under continuous-conduction-mode operation. Built-in

line-voltage

output-power limit. Hiccup operation during output

overloading is also guaranteed.

functions such as brownout protection and RI pin

open/short.

The

For PFC stage, the proprietary multi-vector control

For the flyback PWM, the synchronized slope

In addition, SG6903 provides complete protection

patented

www.sg.com.tw • www.fairchildsemi.com

compensation

interleave-switching

Product Specification

maintains

September 28, 2007

SG6903

constant

feature

Related parts for SG6903SZ

SG6903SZ Summary of contents

Page 1

Green Mode PFC/Flyback-PWM Controller FEATURES OVERVIEW Interleaved PFC/PWM switching Green-mode PFC and PWM operation No switching of PFC at light loads for best power saving Low start-up and operating current Innovative switching-charge multiplier-divider Multi-vector control for improved PFC output transient ...

Page 2

... Green Mode PFC/Flyback-PWM Controller MARKING DIAGRAMS SOP =Lead Free SG6903 TP Null=regular package XXXXXXXX: Wafer Lot XXXXXXXXYWWV Y: Year; WW: Week V: Assembly Location ORDERING INFORMATION Part Number Pb-Free Package SG6903SZ 16-pin SOP © System General Corp. Version 1.0.1 (IAO33.0061.B0) Product Specification PIN CONFIGURATION VRMS IEA 3 14 ...

Page 3

Green Mode PFC/Flyback-PWM Controller PIN DESCRIPTIONS Name Pin No. Type Line-Voltage VRMS 1 Detection RI 2 Oscillator Setting Output for PFC IEA 3 Current Amplifier Inverting Input for IPFC 4 PFC Current Amplifier Non-inverting Input for IMP 5 PFC Current ...

Page 4

Green Mode PFC/Flyback-PWM Controller BLOCK DIAGRAM © System General Corp. Version 1.0.1 (IAO33.0061.B0) Product Specification - 4 - www.sg.com.tw • www.fairchildsemi.com SG6903 September 28, 2007 ...

Page 5

Green Mode PFC/Flyback-PWM Controller ABSOLUTE MAXIMUM RATINGS Symbol Parameter V DC Supply Voltage* VDD I Input AC Current AC V OPWM, OPFC, IAC High V Others Low P Power Dissipation At T < 50° Operating Junction Temperature ...

Page 6

Green Mode PFC/Flyback-PWM Controller Oscillator & Green-Mode Operation Symbol Parameter F PWM Frequency OSC F Minimum Frequency in Burst Mode OSC-MINFREQ RI RI Pin Resistance Range RI Pin Open Protection RI OPEN If RI> SG6903 will turn off ...

Page 7

Green Mode PFC/Flyback-PWM Controller Current Error Amplifier Symbol Parameter V Input Offset Voltage ((-) > (+)) OFFSET A Open-loop Gain I BW Unit Gain Bandwidth CMRR Common-mode Rejection Ratio V Output High Voltage OUT-HIGH V Output Low Voltage OUT-LOW I ...

Page 8

Green Mode PFC/Flyback-PWM Controller PWM Stage FBPWM Symbol Parameter Current Comparator Attenuation v-PWM Z Input Impedance FB I Maximum Source Current FB FB PWM Open Loop Protection voltage OPEN-LOOP t PWM Open Loop Protection Delay Time OPEN-PWM ...

Page 9

Green Mode PFC/Flyback-PWM Controller TYPICAL CHARACTERISTICS S tart-Up C urrent ( Temperature -40 -25 - Temperature ( ) Operating C urrent ( ...

Page 10

Green Mode PFC/Flyback-PWM Controller P WM Frequency ( Temperature -40 -25 - Temperature ( ) ℃ Minimum Frequency ( ...

Page 11

Green Mode PFC/Flyback-PWM Controller Ris ing Time ( Temperature 120 104 -40 -25 - Temperature ( ) ℃ F alling Time ( Temperature F ...

Page 12

Green Mode PFC/Flyback-PWM Controller Peak C urrent Limit Threshold Voltage 2 (V Temperature 0.70 0.68 0.66 0.64 0.62 0.60 -40 -25 - Temperature ( ) Ris ing Time ( Temperature 120 ...

Page 13

Green Mode PFC/Flyback-PWM Controller OPERATION DESCRIPTION SG6903 is a highly integrated PFC/PWM combo controller. Lots functions and protections are built in to provide a possible compact design. The following description will describe the operation and function in detail to give ...

Page 14

Green Mode PFC/Flyback-PWM Controller PFC Output Voltage Control (RANGE) For a universal input (90 ~ 264Vac) power supply applying active boost PFC and Flyback as a second stage, the output voltage of PFC is usually designed around 250V at low ...

Page 15

Green Mode PFC/Flyback-PWM Controller According to Equation (5), the minimum value of R2 and maximum of Rs can be determined since I should not exceed the specified maximum value. There are different concerns in determining the value of the sense ...

Page 16

Green Mode PFC/Flyback-PWM Controller Multi-vector Error Amplifier Although the PFC stage has a low bandwidth voltage loop for better input power factor, the innovative Multi-Vector Error Amplifier provides a fast transient response to clamp the overshoot and undershoot of the ...

Page 17

Green Mode PFC/Flyback-PWM Controller Limited Power Control Every time when the output of power supply is shorted or over loaded, the FBPWM voltage will increase. If the FBPWM voltage is higher than a designed threshold, FB (4.5V), for longer than ...

Page 18

Green Mode PFC/Flyback-PWM Controller PACKAGE INFORMATION 16 PINS – PLASTIC SOP ( DIMENSION: Millimeter Symbol Min. A 1.346 A1 0.101 A2 1.244 9.804 E 3.810 e H 5.791 L 0.406 F y ...

Page 19

Green Mode PFC/Flyback-PWM Controller © System General Corp. Version 1.0.1 (IAO33.0061.B0) Product Specification - 19 - www.sg.com.tw • www.fairchildsemi.com SG6903 September 28, 2007 ...

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