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PDF SG6932 Data sheet ( Hoja de datos )
| Número de pieza | SG6932 | |
| Descripción | PFC / Forward PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
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www.DataSheet4U.com
May 2008
SG6932
PFC / Forward PWM Controller
Features
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
Applications
Switch-mode Power Supplies with Active PFC
Servo-system Power Supplies
PC-ATX Power Supplies
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 proprietary interleave-switching feature
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 operation during output overloading is
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.
Ordering Information
Part
Number
SG6932DZ
SG6932SZ
Operating Temperature
Range
-40°C to +85°C
-40°C to +85°C
Package
16-pin Dual In-Line Package (DIP)
16-pin Small Outline Package (SOP)
Packing
Eco Status Method
RoHS
Tube
RoHS
Tape & Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2007 Fairchild Semiconductor Corporation
SG6932 • Rev. 1.1.3
www.fairchildsemi.com
1 page  
Pin Definitions
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Pin # Name Description
1 VRMS Line-Voltage Detection. The pin is used for PFC multiplier and brownout protection.
Oscillator Setting. One resistor connected between RI and ground determines the switching
2
RI
frequency. A resistor with resistance between 12 ~ 47kΩ is recommended. The switching
frequency is equal to [1560 / RI]kHz, where RI is in kΩ. For example, if RI is 24kΩ, the
switching frequency is 65kHz.
3
IEA
Output of PFC Current Amplifier. The signal from this pin is compared with an internal
sawtooth to determine the pulsewidth for PFC gate drive.
4
IPFC
Inverting Input of PFC Current Amplifier. Proper external compensation circuits result in
excellent input power factor via average-current-mode control.
5
IMP
Non-inverting Input of PFC Current Amplifier and Output of Multiplier. Proper external
compensation circuits result in excellent input power factor via average-current-mode control.
6 ISENSE Peak Current Limit Setting for PFC.
PWM Feedback Input. The control input for voltage-loop feedback of PWM stage. It is
7 FBPWM internally pulled HIGH through a 6.5kΩ resistor. An external opto-coupler from the secondary
feedback circuit is usually connected to this pin.
PWM Current Sense. The current sense input for the PWM stage. Via a current sense
8 IPWM resistor, this pin provides the control input for peak-current-mode control and cycle-by-cycle
current limiting.
9
OPWM
PWM Gate Drive. The totem-pole output drive for PWM MOSFET. This pin is internally
clamped under 18V to protect the MOSFET.
10 GND Ground. The power ground.
11
OPFC
PFC Gate Drive. The totem-pole output drive for the PFC MOSFET. This pin is internally
clamped under 18V to protect the MOSFET.
12
VDD
Supply. The power supply pin. The threshold voltages for start-up and turn-off are 14V and
10V, respectively. The operating current is lower than 10mA.
PWM Soft-Start. During startup, the SS pin charges an external capacitor with a 50µA
13
SS
constant current source. The voltage on FBPWM is clamped by SS during startup. In the event
of a protection condition occurring and/or PWM being disabled, the SS pin is quickly
discharged. The voltage of SS pin can be used to select 50% or 65% maximum duty cycle.
14
FBPFC
Voltage Feedback Input for PFC. The feedback input for PFC voltage loop. The inverting
input of PFC error amplifier. This pin is connected to the PFC output through a divider network.
Error Amplifier Output for PFC Voltage Feedback Loop. A compensation network (usually a
15 VEA capacitor) is connected between this pin and ground. A large capacitor value results in a
narrow bandwidth and improves the power factor.
16
IAC
Input AC Current. For normal operation, this input is used to provide current reference for the
multiplier. The suggested maximum IAC is 360µA.
© 2007 Fairchild Semiconductor Corporation
SG6932 • Rev. 1.1.3
5
www.fairchildsemi.com
5 Page 
Typical Characteristics (Continued)
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3.30
3.29
3.28
3.27
3.26
3.25
3.24
3.23
3.22
3.21
3.20
-40℃ -25℃ -10℃ 5℃ 20℃ 35℃ 50℃ 65℃ 80℃ 95℃ 110℃ 125℃
Temperature (℃)
Figure 11. PFC Over-voltage Protection
vs. Temperature
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
-40℃ -25℃ -10℃
5℃
20℃ 35℃ 50℃ 65℃ 80℃ 95℃ 110℃ 125℃
Temperature (℃)
Figure 12. PWM Frequency (fOSC)
vs. Temperature
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
-40℃ -25℃ -10℃ 5℃ 20℃ 35℃ 50℃ 65℃ 80℃ 95℃ 110℃ 125℃
Temperature (℃)
Figure 13. Rising Time vs. Temperature
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
-40℃ -25℃ -10℃ 5℃ 20℃ 35℃ 50℃ 65℃ 80℃ 95℃ 110℃ 125℃
Temperature (℃)
Figure 14. Falling 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℃ 50℃ 65℃ 80℃ 95℃ 110℃ 125℃
Temperature (℃)
Figure 15. Reference Voltage vs. Temperature
50.0
49.5
49.0
48.5
48.0
47.5
47.0
46.5
46.0
-40℃ -25℃ -10℃ 5℃ 20℃ 35℃ 50℃ 65℃ 80℃ 95℃ 110℃ 125℃
Temperature (℃)
Figure 16. Maximum Duty Cycle (SS=5V)
vs. Temperature
© 2007 Fairchild Semiconductor Corporation
SG6932 • Rev. 1.1.3
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SG6932.PDF ] | |
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