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參數(shù)資料
| 型號： | SG6902 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Green-Mode PFC / Flyback-PWM Controller |
| 中文描述： | 綠色模式PFC /反激式，PWM控制器 |
| 文件頁數(shù)： | 3/22頁 |
| 文件大?。?/td> | 863K |
| 代理商： | SG6902 |
Product Specification
Green-Mode PFC / Flyback-PWM Controller
PIN DESCIRPTIONS
SG6902
System General Corp.
Version 1.3.1 (IAO33.0022.B3)
- 3 -
www.sg.com.tw www.fairchildsemi.com
September, 2007
Name
Pin No.
Type
Function
VRMS
1
Line Voltage Detection
Line voltage detection. The pin is used for PFC multiplier, RANGE control of PFC
output voltage, and brownout protection. For brownout protection, the controller is
disabled after a delay time when the V
RMS
voltage drops below a threshold.
Reference setting. One resistor connected between RI and AGND determines the
switching frequency. The switching frequency is equal to [1560 / RI] kHz, where RI is
in k
Ω
. For example, if R
I
is 24k
Ω
, the switching frequency is 65kHz.
This pin supplies an over-temperature protection signal. A constant current is output
from this pin. An external NTC thermistor must be connected from this pin to ground.
The impedance of the NTC thermistor decreases whenever the temperature
increases. Once the voltage of the OTP pin drops below the OTP threshold, the
SG6902 is disabled.
RI
2
Oscillator Setting
OTP
3
Over-Temperature Protection
IEA
4
Output for PFC Current
Amplifier
This is the output of the PFC current error amplifier. The signal from this pin is
compared with an internal sawtooth and determines the pulse width for PFC gate
drive.
The inverting input of the PFC current error amplifier. Proper external compensation
circuits result in excellent input power factor via average-current-mode control.
The non-inverting input of the PFC current amplifier and also the output of multiplier.
Proper external compensation circuits will result in excellent input power factor via
average-current-mode control.
IPFC
5
Inverting Input for PFC
Current Amplifier
IMP
6
Non-Inverting Input for PFC
Current Amplifier
ISENSE
7
Peak Current Limit Setting for
PFC
The peak-current setting for PFC.
FBPWM
8
PWM Feedback Input
The control input for voltage-loop feedback of PWM stage. It is internally pulled high
through a resistor. An external opto-coupler from secondary feedback circuit is
usually connected to this pin.
IPWM
9
PWM Current Sense
The current-sense input for the flyback PWM. Via a current sense resistor, this pin
provides the control input for peak-current-mode control and cycle-by-cycle current
limiting.
Signal ground.
During start-up, the SS pin charges an external capacitor with a 50μA (R
I
=24k
Ω
)
constant-current source. The voltage on FBPWM is clamped by SS during start-up. In
the event of a protection condition occurring and/or PWM being disabled, the SS pin
quickly discharges.
AGND
10
Ground
SS
11
PWM Soft-Start
OPWM
12
PWM Gate Drive
The totem-pole output drive for the flyback PWM MOSFET. This pin is internally
clamped under 18V to protect the MOSFET
.
Power ground.
The totem-pole output drive for the PFC MOSFET. This pin is internally clamped
under 18V to protect the MOSFET
.
The power supply pin.
Two-level output voltage setting for PFC. The PFC output voltage at low line can be
reduced to improve efficiency. The RANGE pin is of high impedance while the V
RMS
voltage is lower than a threshold.
The PFC stage over-voltage input. The comparator disables the PFC output driver if
the voltage at this input exceeds a threshold. This pin can be connected to FBPFC or
it can be connected to the PFC boost output through a divider network.
GND
13
Ground
OPFC
14
PFC Gate Drive
VDD
15
Supply
RANGE
16
PFC Output Voltage Control
OVP
17
PFC Over-Voltage Input
FBPFC
18
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.
The error amplifier output for PFC voltage feedback loop. A compensation network
(usually a capacitor) is connected between this pin and ground. A large capacitor
value results in a narrow bandwidth and improves the power factor.
Before start-up, this input is used to provide start-up current for V
DD
. For normal
operation, this input is used to provide current reference for the multiplier.
VEA
19
Error Amplifier Output for
PFC Voltage Feedback Loop
IAC
20
Input AC Current
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SG6902SZ | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Grn Mode PFC/Flyback PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SG6903SZ | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Highly-Integrated Grn Mode PWM Cntrl RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SG6905 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green mode PFC/Flyback-PWM Controller |
| SG6905SY | 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG6905SZ | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Grn Mode PFC/Forward PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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