SG6901

Manufacturer Part NumberSG6901
DescriptionThe highly integrated SG6901A is designed for power supplies with boost PFC and flyback PWM
ManufacturerFairchild Semiconductor
SG6901 datasheet
 
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SG6901A
CCM PFC/Flyback PWM Combination Controller
Features
Interleaved PFC/PWM Switching
Low Startup 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
Protections
PFC and PWM Feedback Open-Loop Protection
Cycle-by-Cycle Current Limiting for PFC/PWM
Slope Compensation for PWM
H/L Line Over-Power Compensation for PWM
Brownout Protection
Over-Temperature Protection (OTP)
Applications
Switching Power Supplies with Active PFC and
Standby Power
High-Power Adaptors
Ordering Information
Operating
Part Number
Temperature Range
SG6901ASZ
-30°C to +85°C
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
SG6901A • Rev. 1.0.2
Description
The highly integrated SG6901A is designed for power
supplies with boost PFC and flyback PWM. It requires
very few external components to achieve versatile
protections. It is available in a 20-pin SOP package.
A proprietary 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.
For
the
flyback
PWM,
compensation ensures the stability of the current loop
under continuous-conduction-mode operation. Built-in
line-voltage compensation maintains constant 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.
Eco
Package
Status
, Small Outline Integrated
20-Lead
Circuit (SOIC), JEDEC
RoHS
MS013, .300 inch, Wide Body
February 2009
the
synchronized
slope
Packing
Method
Tape & Reel
www.fairchildsemi.com

SG6901 Summary of contents

  • Page 1

    ... 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. For the ...

  • Page 2

    ... Application Circuit © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 Figure 1. Typical Application 2 www.fairchildsemi.com ...

  • Page 3

    ... Block Diagram © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 Figure 2. Block Diagram 3 www.fairchildsemi.com ...

  • Page 4

    ... Marking Information Pin Configuration © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 T- S=SOP P- Z=Lead Free Null=regular package XXXXXXXX- Wafer Lot Y: Year; WW: Week V: Assembly Location Figure 3. Top Mark Figure 4. Pin Configuration 4 www.fairchildsemi.com ...

  • Page 5

    ... The impedance of the NTC thermistor 3 OTP decreases whenever the temperature increases. Once the voltage of the OTP pin drops below the OTP threshold, the SG6901A is disabled. PFC current amplifier output. The signal from this pin is compared with an internal sawtooth 4 IEA to determine the pulse width for PFC gate drive ...

  • Page 6

    ... Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol T Operating Ambient Temperature A © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 Parameter < 50℃ A Human Body Model, JESD22-A114 Machine Model, JESD22-A115 Parameter 6 Min ...

  • Page 7

    ... Threshold for RANGE RMS-L RMS Comparator t Range-Enable Delay Time RANGE V Output Low Voltage of RANGE Pin OL I Output High Leakage Current of OH RANGE Pin © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 Conditions 0V < V < DD-ON V =15V; OPFC, DD OPWM Open; R OVP DD R =24KΩ > ...

  • Page 8

    ... Unit Gain Bandwidth CMRR Common Mode Rejection Ratio V Output High Voltage OUT-HIGH V Output Low Voltage OUT-LOW Reference Current Source MR1 MR2 I Maximum Source Current L I Maximum Sink Current H © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 Conditions Min. Typ. 2.95 3.00 60 110 3.20 3. 3.10 3.15 0.5 2.75 2.85 6.5 1.5 2 ...

  • Page 9

    ... FB FB PWM Open-Loop Protection Voltage OPEN-LOOP PWM Open-Loop Protection Delay t OPEN-PWM Time t Interval of PWM Open-Loop OPEN-PWM- Protection Reset Hiccup © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 Conditions R =24KΩ =1.05V RMS SENSE V =3V RMS Multiplier Linear Range R =24KΩ ...

  • Page 10

    ... OTP-ON V OTP Threshold Voltage OTP-OFF t OTP Debounce Time OTP SOFT START SECTION Constant Current Output I SS for Soft-Start R Discharge R D DSON © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 Conditions Min. V =15V, OPWM<= RANGE=Open 0.65 RANGE=Ground 0.60 270 =△ /T) △V S SLOPE ...

  • Page 11

    ... Temperature (°C) Figure 7. Operating Current Start Threshold Voltage (V 13.0 12.6 12.2 11.8 11.4 11.0 -40 -25 - Temperature (°C) Figure 9. V Turn-On Threshold Voltage DD © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 ) vs. Temperature 11.0 10.6 10.2 9.8 9.4 9 110 125 Figure vs. Temperature ...

  • Page 12

    ... Temperature (°C) Figure 13. Low V Threshold for RANGE Comparator RMS PFC Over-Voltage Protection (OVP 3.30 3.28 3.26 3.24 3.22 3.20 -40 -25 - Temperature (°C) Figure 15. PFC OVP Threshold Voltage © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 ) vs. Temperature RMS-H 3.05 3.03 3.01 2.99 2.97 2. 110 125 - RMS-L 120 104 88 ...

  • Page 13

    ... Temperature F-PWM 110 -40 -25 - Temperature (°C) Figure 21. OPWM Falling Time © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 ) vs. Temperature Peak Current Limit Threshold Voltage 1 (V MAX 0.75 0.73 0.71 0.69 0.67 0.65 - 110 125 Figure 18. Peak Current Limit Threshold Voltage ) vs ...

  • Page 14

    ... Typical Performance Characteristics OTP Threshold Voltage (V 1.25 1.23 1.21 1.19 1.17 1.15 -40 -25 - Temperature (°C) Figure 23. V OTPurn Threshold Voltage DD © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 ) vs. Temperature OTP-OFF 110 125 14 www.fairchildsemi.com ...

  • Page 15

    ... VRMS pin. The VRMS voltage is used for the PFC multiplier, brownout protection, and range control. For brownout protection, SG6901A is disabled with a 195ms delay if the voltage VRMS drops below 0.8V. For PFC multiplier and range control, refer to the PFC Operation section below for details ...

  • Page 16

    ... OVPPFC. voltage, the Cycle-by-Cycle Current Limiting SG6901A provides cycle-by-cycle current limiting for both PFC and PWM stages. Figure 28 shows the peak current limit for the PFC stage. The PFC gate drive is terminated once the voltage on the ISENSE pin goes ...

  • Page 17

    ... FBPWM is clamped by the SS voltage during startup. In the event of a protected condition and/or PWM is disabled, the SS pin quickly discharges. Gate Driver SG6901A output stage is a fast totem-pole gate driver. The output driver is clamped by an internal 18V Zener diode to protect the external power MOSFET. 17 ...

  • Page 18

    ... Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 13.00 12.60 A 11.43 ...

  • Page 19

    ... Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 19 www.fairchildsemi.com ...