IC PFC CONTROLLER 16SOIC

SG6903SZ

Manufacturer Part NumberSG6903SZ
DescriptionIC PFC CONTROLLER 16SOIC
ManufacturerFairchild Semiconductor
SG6903SZ datasheet
 


Specifications of SG6903SZ

Mounting TypeSurface MountPackage / Case16-SOIC (3.9mm Width)
Output Voltage1.5 V to 8 VSwitching Frequency65 KHz
Operating Temperature Range- 20 C to + 85 CMounting StyleSMD/SMT
Duty Cycle (max)83 %Lead Free Status / RoHS StatusLead free / RoHS Compliant
Voltage - Supply-Operating Temperature-
Frequency - Switching-Mode-
Current - Startup-  
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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 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
APPLICATIONS
Switching Power Suppliers with Active PFC
High-Power Adaptors
DESCRIPTION
The highly integrated SG6903 is specially designed
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
© System General Corp.
Version 1.0.1 (IAO33.0061.B0)
Product Specification
The
patented
interleave-switching
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.
For PFC stage, the proprietary multi-vector control
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.
For the flyback PWM, the synchronized slope
compensation ensures the stability of the current loop
under continuous-conduction-mode operation. Built-in
line-voltage
compensation
output-power limit. Hiccup operation during output
overloading is also guaranteed.
In addition, SG6903 provides complete protection
functions such as brownout protection and RI pin
open/short.
- 1 -
www.sg.com.tw • www.fairchildsemi.com
SG6903
feature
maintains
constant
September 28, 2007

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 ...