sg6961_783 | Amplifier | Capacitor

 Documents

 39 views
of 14
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Description
June 2010 © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com SG6961 ã Rev. 1.3.2 S G 6 9 6 1 — C r i t i c a l C o n d u c t i o n M o d e P F C C o n t r o l l e r SG6961 Critical Conduction Mode PFC Controller Features Boundary Mode PFC Controller Low Input Current THD Controlled On-Time PWM Zero-Current Detection Cycle-by-cycle Current Limiting Leading-Edge Blanking Instead of RC Filtering Low Startup Current: 10µA (Typical) Lo
Share
Tags
Transcript
  June 2010 © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com SG6961 ã Rev. 1.3.2  S  G 6  9  6 1 —  C r i   t  i   c al   C  on d  u c t  i   onM o d  eP F  C  C  on t  r  ol  l   er  SG6961 Critical Conduction Mode PFC Controller Features    Boundary Mode PFC Controller    Low Input Current THD    Controlled On-Time PWM    Zero-Current Detection    Cycle-by-cycle Current Limiting    Leading-Edge Blanking Instead of RC Filtering    Low Startup Current: 10µA (Typical)    Low Operating Current: 4.5mA (Typical)    Feedback Open-Loop Protection    Programmable Maximum On-Time    Output Over-Voltage Clamping Protection    Clamped Gate Output Voltage 16.5V Applications    Electric Lamp Ballasts     AC-DC Switching Mode Power Converter    Open-Frame Power Supplies and Power Adapters Description The SG6961 is an 8-pin boundary mode PFC controller IC intended for controlling PFC pre-regulators. The SG6961 provides a controlled on-time to regulate the output DC voltage and achieve natural power factor correction. The maximum on-time of the external switch is programmable to ensure safe operation during AC brownouts. An innovative multi-vector error amplifier is built in to provide rapid transient response and precise output voltage clamping. A built-in circuit disables the controller if the output feedback loop is opened. The startup current is lower than 20µA and the operating current is under 4.5mA. The supply voltage can be up to 20V, maximizing application flexibility. Ordering Information Part Number Operating Temperature Range Package Packing Method SG6961SZ -30°C to +85°C 8-Pin Small Outline Package (SOP) Tape & Reel SG6961DZ -30°C to +85°C 8-Pin Dual Inline Package (DIP) Tube SG6961SY -30°C to +85°C 8-Pin Small Outline Package (SOP) Tape & Reel   © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com SG6961 ã Rev. 1.3.2 2  S  G 6  9  6 1 —  C r i   t  i   c al   C  on d  u c t  i   onM o d  eP F  C  C  on t  r  ol  l   er  Application Circuit ZCD MOT GND CS GD INV COMP VCC SG6961 VAC Vo   Figure 1. Typical Application Block Diagram Figure 2. Block Diagram   © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com SG6961 ã Rev. 1.3.2 3  S  G 6  9  6 1 —  C r i   t  i   c al   C  on d  u c t  i   onM o d  eP F  C  C  on t  r  ol  l   er   Marking Information ※  Marking for SG6961SZ (pb-free) ※  Marking for SG6961DZ (pb-free) ※  Marking for SG6961SY (Green-Compound) Figure 3. Top Mark : Fairchild Logo Z: Plant Code X: Year Code Y: Week Code TT: Die Run Code T: Package Type (S = SOP) P: Y =   Green Compound M: Manufacturing Flow Code  T- D=DIP, S=SOP P- Z=Lead Free + ROHS Compatible Null=Regular Package XXXXXXXX- Wafer Lot Y: Year; WW: Week V: Assembly Location   © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com SG6961 ã Rev. 1.3.2 4  S  G 6  9  6 1 —  C r i   t  i   c al   C  on d  u c t  i   onM o d  eP F  C  C  on t  r  ol  l   er   Pin Configuration Figure 4. Pin Configuration Pin Definitions Pin # Name Description 1 INV Inverting Input of the Error Amplifier  . INV is connected to the converter output via a resistive divider. This pin is also used for over-voltage clamping and open-loop feedback protection.   2 COMP The Output of the Error Amplifier  . To create a precise clamping protection, a compensation network between this pin and GND is suggested.   3 MOT Maximum On Time . A resistor from MOT to GND is used to determine the maximum on-time of the external power MOSFET. The maximum output power of the converter is a function of the maximum on time.   4 CS Current Sense . Input to the over-current protection comparator. When the sensed voltage across the sense resistor reaches the internal threshold (0.8V), the switch is turned off to activate cycle-by-cycle current limiting.   5 ZCD Zero Current Detection . This pin is connected to an auxiliary winding via a resistor to detect the zero crossing of the switch current. When the zero crossing is detected, a new switching cycle is started. If it is connected to GND, the device is disabled. 6 GND Ground . The power ground and signal ground. Placing a 0.1µF decoupling capacitor between VCC and GND is recommended.   7 GD Driver Output . Totem-pole driver output to drive the external power MOSFET. The clamped gate output voltage is 16.5V.   8 VCC Power Supply . Driver and control circuit supply voltage.
Related Search
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks