sg6901asz-f116

Manufacturer Part Numbersg6901asz-f116
DescriptionPfc/flyback-pwm Controller
ManufacturerFairchild Semiconductor
sg6901asz-f116 datasheet
 
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PFC / Flyback PWM Controller
FEATURES OVERVIEW
Interleaved PFC/PWM switching
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
Over-temperature protection (OTP)
APPLICATIONS
Switching Power Supplies with Active PFC and
Standby Power
High-Power Adaptors
DESCRIPTION
The highly integrated SG6901A is designed for power
supplies with boost PFC and flyback PWM. It requires
Typical Application
© System General Corp.
Version 1.0.1 (IAO33.0062.B0)
very few external components to achieve versatile
protections. It is available in a 20-pin SOP package.
The patented interleave-switching feature synchronizes
the PFC and PWM stages and reduces switching noise.
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 SG6901A shuts off PFC to
prevent extra-high voltage on output. Programmable
two-level output voltage control reduces 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, SG6901A provides protection functions, such
as brownout and RI pin open/short protection.
- 1 -
www.sg.com.tw • www.fairchildsemi.com
Product Specification
SG6901A
maintains
constant
September 26, 2007

sg6901asz-f116 Summary of contents

  • Page 1

    PFC / Flyback PWM Controller FEATURES OVERVIEW Interleaved PFC/PWM switching 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 ...

  • Page 2

    ... PFC / Flyback PWM Controller MARKING DIAGRAMS T: S=SOP P : SG6901A TP XXXXXXXX: Wafer Lot XXXXXXXXYWWV Y: Year; WW: Week V: Assembly Location ORDERING INFORMATION Part Number Pb-Free SG6901ASZ © System General Corp. Version 1.0.1 (IAO33.0062.B0) PIN CONFIGURATION Z=Lead Free Null=regular package Package 20-pin SOP - 2 - Product Specification SG6901A www.sg.com.tw • www.fairchildsemi.com ...

  • Page 3

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

  • Page 4

    PFC / Flyback PWM Controller BLOCK DIAGRAM © System General Corp. Version 1.0.1 (IAO33.0062.B0 www.sg.com.tw • www.fairchildsemi.com Product Specification SG6901A September 26, 2007 ...

  • Page 5

    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 ...

  • Page 6

    PFC / Flyback PWM Controller VRMS for UVP and RANGE Symbol Parameter RMS AC Voltage Under-Voltage Protection V RMS-UVP-1 Threshold (with t delay) UVP V Recovery Level on V RMS-UVP-2 RMS When UVP Occurs, Interval from PFC Off to t ...

  • Page 7

    PFC / Flyback PWM Controller Peak Current Limit Symbol Parameter I Constant Current Output P Peak Current Limit Threshold Voltage V PK Cycle-by-Cycle Limit (V SENSE t Propagation Delay PD-PFC t Leading-Edge Blanking Time LEB-PFC Multiplier Symbol Parameter I Input ...

  • Page 8

    PFC / Flyback PWM Controller PWM-Current Sense Symbol Parameter t Propagation Delay to Output PD-PWM V Peak Current Limit Threshold Voltage1 LIMIT-1 V Peak Current Limit Threshold Voltage2 LIMIT-2 t Leading-Edge Blanking Time LEB-PWM Slope Compensation △V SLOPE PWM Output ...

  • Page 9

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

  • Page 10

    PFC / Flyback PWM Controller Hig resho ANGE arator (V Tem p eratur e 2.00 1.98 1.96 1.94 1.92 1.90 -40 -25 - Tem ...

  • Page 11

    PFC / Flyback PWM Controller Maximum Duty C ycle ( Temperature -40 -25 - Temperature ( ) ℃ Open Loop P rotection ...

  • Page 12

    PFC / Flyback PWM Controller F alling Time ( Temperature 110 -40 -25 - Temperature ( ) ℃ PWM Maximum Duty C ycle (DC Y ...

  • Page 13

    PFC / Flyback PWM Controller OPERATION DESCRIPTION SG6901A is a highly integrated PFC/PWM combination controller. Many functions and protections are built in to provide a compact design. The following sections describe the operation and function. Switching Frequency and Current Sources ...

  • Page 14

    PFC / Flyback PWM Controller Interleave Switching The SG6901A uses interleaved switching to synchronize the PFC and flyback stages, which reduces switching noise and spreads the EMI emissions. Figure 3 shows off-time inserted between the turn-off of the ...

  • Page 15

    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 ...

  • Page 16

    PFC / Flyback PWM Controller FIG Controlled Current Limiting RMS The peak current of the I is given by (V SENSE × 0. ------------------ SENSE_peak R S Flyback PWM and ...

  • Page 17

    PFC / Flyback PWM Controller PACKAGE INFORMATION 20 PINS – PLASTIC SOP ( Dimensions: Millimeter Symbol Min. A 2.362 A1 0.101 A2 2.260 12.598 E 7.391 e H 10.007 L 0.406 F y ...

  • Page 18

    PFC / Flyback PWM Controller © System General Corp. Version 1.0.1 (IAO33.0062.B0 www.sg.com.tw • www.fairchildsemi.com Product Specification SG6901A September 26, 2007 ...