SG6932 Fairchild Semiconductor, SG6932 Datasheet

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SG6932

Manufacturer Part Number
SG6932
Description
The highly integrated SG6932 is designed for power supplies with boost PFC and forward PWM
Manufacturer
Fairchild Semiconductor
Datasheet
© 2007 Fairchild Semiconductor Corporation
SG6932 • Rev. 1.1.3
SG6932
PFC / Forward PWM Controller
Features
Applications
Ordering Information
SG6932DZ
SG6932SZ
Number
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
Part
Interleaved PFC/PWM Switching
Low Operating Current
Innovative Switching-Charge Multiplier-divider
Multi-vector Control for Improved PFC Output
Transient Response
Average Current Mode for Input-current Shaping
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
Selectable PWM Maximum Duty Cycle: 50%, 65%
Brownout Protection
Power-on Sequence Control and Soft-start
Switch-mode Power Supplies with Active PFC
Servo-system Power Supplies
PC-ATX Power Supplies
Operating Temperature
-40°C to +85°C
-40°C to +85°C
Range
16-pin Dual In-Line Package (DIP)
16-pin Small Outline Package (SOP)
Package
Description
The highly integrated SG6932 is designed for power
supplies with boost PFC and forward PWM. It requires
very few external components to achieve versatile
protections and compensation. It is available in 16-pin
DIP and SOP packages.
The
synchronizes the PFC and PWM stages and reduces
switching noise. At light load, the switching frequency is
continuously decreased to 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, SG6932 shuts off to prevent
extra-high voltage on output.
For the forward PWM stage, the synchronized slope
compensation ensures the stability of the current loop
under continuous-conduction-mode (CCM) operation.
Hiccup
guaranteed. The soft-start and programmable maximum
duty cycle ensure safe operation.
SG6932 provides complete protection functions, such
as brownout protection and RI open/short latch off.
proprietary
operation
during
interleave-switching
Eco Status
RoHS
RoHS
output
overloading
May 2008
www.fairchildsemi.com
Tape & Reel
Packing
Method
Tube
feature
is

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SG6932 Summary of contents

Page 1

... PFC loop; in which the overshoot and undershoot of the PFC voltage are clamped. If the feedback loop is broken, SG6932 shuts off to prevent extra-high voltage on output. For the forward PWM stage, the synchronized slope compensation ensures the stability of the current loop under continuous-conduction-mode (CCM) operation ...

Page 2

... Application Diagram © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 Figure 1. Typical Application 2 www.fairchildsemi.com ...

Page 3

... Block Diagram © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 Figure 2. Function Block Diagram 3 www.fairchildsemi.com ...

Page 4

... Marking Information SG6932TP XXXXXXXXYWWV Pin Configuration © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 T: D=DIP, S=SOP P : XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location Figure 3. Top Mark VRMS IEA 3 14 IPFC IMP 12 6 ISENSE 11 FBPWM 7 10 IPWM 8 9 Figure 4. Pin Configuration (Top View) ...

Page 5

... Input AC Current. For normal operation, this input is used to provide current reference for the 16 IAC multiplier. The suggested maximum I © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 ]kHz, where kΩ. For example 360µA. ...

Page 6

... The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter T Operating Ambient Temperature A © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 Parameter <50°C) A DIP SOP Min. -40 6 Min ...

Page 7

... I Maximum Source Current FBPFC-L I Maximum Sink Current FBPFC-H UVP PFC Feedback Under-Voltage Protection VFB V Voltage Level on FBPFC to Disable OPWM OFF-FBPFC © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 Conditions V – 0.16V 15V; OPFC OPWM open DD OVP1 R =24kΩ =24kΩ ...

Page 8

... V Z-PFC (Clamp) V Output Voltage Low OL-PFC V Output Voltage High OH-PFC t Rising Time R-PFC t Falling Time F-PFC DC Maximum Duty Cycle MAX © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 (Continued) Conditions EA V =0~1. =24kΩ =20+I •0. =24kΩ =1.05V ...

Page 9

... Constant Current Output for I SS Soft-Start V Voltage of SS for 50% Maximum Duty Cycle DC-MAX-50% V Voltage of SS for 65% Maximum Duty Cycle DC-MAX-65% R Discharge Resistance D © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 (Continued) Conditions R =24kΩ =24kΩ =15V, OPWM DD Drops to 9V =△V (t /t) △ ...

Page 10

... Temperature (℃) Figure 7. Start Threshold Voltage (V vs. Temperature 70.0 60.0 50.0 40.0 30.0 20.0 10.0 0.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 FB Voltage (V) Figure 9. Duty Cycle vs. FB Voltage © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 11.0 10.8 10.6 10.4 10.2 10.0 9.8 9.6 9.4 9.2 9.0 -40℃ 50℃ 65℃ 80℃ 95℃ 110℃ 125℃ Figure 6. Minimum Operation Voltage (V ) vs. Temperature 10 ...

Page 11

... Temperature (℃) Figure 13. Rising Time vs. Temperature 3.05 3.04 3.03 3.02 3.01 3.00 2.99 2.98 2.97 2.96 2.95 -40℃ -25℃ -10℃ 5℃ 20℃ 35℃ Temperature (℃) Figure 15. Reference Voltage vs. Temperature © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 (Continued) 68.0 67.5 67.0 66.5 66.0 65.5 65.0 64.5 64.0 63.5 63.0 62.5 62.0 50℃ 65℃ 80℃ 95℃ 110℃ 125℃ 100.0 90.0 80.0 70.0 60.0 50 ...

Page 12

... Temperature (℃) Figure 21. PWM Open-Loop Protection Delay Time vs. Temperature Figure 23. Peak Current Limit Threshold Voltage vs. Temperature © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 (Continued) 120.0 110.0 100.0 90.0 80.0 70.0 60.0 50.0 40.0 30.0 50℃ 65℃ 80℃ 95℃ ...

Page 13

... PFC loop; in which the overshoot and undershoot of the PFC voltage are clamped. If the feedback loop; is broken, the SG6932 shuts off PFC to prevent extra- high voltage on output. For the forward PWM, the synchronized slope compensation ensures the stability of the current loop under continuous-mode operation ...

Page 14

... Figure 28 shows the block diagram of the multi-vector error amplifier. When the variation of the feedback voltage exceeds ±5% of the reference voltage, the transconductance error amplifier adjusts its output impedance to increase the loop response opened, SG6932 shuts off immediately to prevent extra-high voltage on the output capacitor. S (4) and ...

Page 15

... V the over-voltage threshold. RI Pin Open / Short Protection. The RI pin is used to set the switching frequency and internal current reference. The PFC and PWM stages of SG6932 are disabled whenever the RI pin is short or open. 15 cycle. The positively sloped ramp is s-comp 0 ...

Page 16

... PCB Layout SG6932 has a single ground pin, which prevents high sink currents in the output being returned separately. Good high-frequency or RF layout practices should be followed. Avoid long PCB traces and component leads. Locate decoupling capacitors near the SG6932. A resistor (5 ~ 20Ω) is recommended, connected in series from the output to the gate of the MOSFET ...

Page 17

... Reference Circuit © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 Figure 33. Reference Circuit 17 www.fairchildsemi.com ...

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/ © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 A 19.68 18. ...

Page 19

... 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/ © 2007 Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 Figure 35. 16-Pin Small Outline Package (SOIC) 19 www.fairchildsemi.com ...

Page 20

... Fairchild Semiconductor Corporation SG6932 • Rev. 1.1.3 20 www.fairchildsemi.com ...

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