SG6901ASZ

Manufacturer Part NumberSG6901ASZ
DescriptionIC PFC CTRLR AVERAGE CURR 20SOIC
ManufacturerFairchild Semiconductor
SG6901ASZ datasheet
 


Specifications of SG6901ASZ

ModeAverage CurrentFrequency - Switching65kHz
Current - Startup10µAVoltage - Supply12 V ~ 20 V
Operating Temperature-30°C ~ 85°CMounting TypeSurface Mount
Package / Case20-SOIC (7.5mm Width)Output Voltage1.5 V to 8 V
Switching Frequency65 KHzOperating Temperature Range- 30 C to + 85 C
Mounting StyleSMD/SMTDuty Cycle (max)98 %
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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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

SG6901ASZ Summary of contents

  • Page 1

    ... 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 ...

  • 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

    ... A large capacitor value results in a narrow bandwidth and improves the power factor. 20 IAC This input is used to provide current reference for the multiplier. © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 I voltage is lower than a threshold. RMS KΩ ...

  • 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 ...

  • 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

    ... 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 ...

  • Page 9

    ... Maximum Source Current 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 ...

  • 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 68 67 ...

  • Page 12

    ... 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 -40 ...

  • Page 13

    ... Figure 19. PWM Open-Loop Protection Voltage Falling Time (t ) vs. 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 ...

  • 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

    ... PFC and flyback as a second stage, the output voltage of PFC is usually designed around 250V at low line and 390V at high line. This can © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 improve the efficiency at low-line input. The RANGE pin (open-drain structure) is used for the two-level output voltage setting ...

  • Page 16

    ... When the variation of the feedback voltage ± 5% exceeds of the reference transconductance error amplifier adjusts its output impedance to increase the loop response. Figure 27. Multi-Vector Error Amplifier © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 The average total input power can be expressed as: and RMS = Pin V IN ...

  • Page 17

    ... Figure 29. Peak Current Control Loop © 2008 Fairchild Semiconductor Corporation SG6901A • Rev. 1.0.2 Limited Power Control Every time the output of the power supply is shorted or overloaded, the FBPWM voltage increases. If the FBPWM voltage is higher than a designed threshold, FBOPEN-LOOP (4 ...

  • Page 18

    ... Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. 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’ ...

  • Page 19

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