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參數(shù)資料
| 型號(hào)： | SG6901A |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | PFC / Flyback PWM Controller |
| 中文描述： | 功率因數(shù)校正/反激式PWM控制器 |
| 文件頁(yè)數(shù)： | 3/18頁(yè) |
| 文件大?。?/td> | 716K |
| 代理商： | SG6901A |
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Product Specification
PFC / Flyback PWM Controller
PIN DESCRIPTIONS
SG6901A
System General Corp.
Version 1.0.1 (IAO33.0062.B0)
- 3 -
www.sg.com.tw www.fairchildsemi.com
September 26, 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 VRMS voltage drops below a threshold.
Reference setting. One resistor connected between RI and ground 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 equal to 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 SG6901A is disabled.
RI
2
Oscillator Setting
OTP
3
Over Temperature
Protection
IEA
4
Output for PFC
Current Amplifier
Inverting Input for
PFC Current
Amplifier
Non-inverting Input
for PFC Current
Amplifier
Peak Current Limit
Setting for PFC
This is the output of the PFC current amplifier. The signal from this pin is compared with
an internal sawtooth and determines the pulse width for PFC gate drive.
IPFC
5
The inverting input of the PFC current amplifier. Proper external compensation circuits
result in excellent input power factor via average-current-mode control.
IMP
6
The non-inverting input of the PFC current amplifier and the output of multiplier. Proper
external compensation circuits will result in excellent input power factor via
average-current-mode control.
ISENS
E
7
The peak-current setting for PFC.
FBPW
M
8
PWM Feedback
Input
The control input for voltage-loop feedback of PWM stage. It is internally pulled high
through a 6.5k
Ω
resistance. Usually an external opto-coupler from secondary feedback
circuit is connected to this pin.
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 startup, the SS pin will charge an external capacitor with a 50μA
(RI=24K
Ω
)
constant current source. The voltage on FBPWM will be clamped by SS during startup. In
the event of a protection condition occurring and/or PWM being disabled, the SS pin will
be quickly discharged.
IPWM
9
PWM Current
Sense
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 17V to protect the MOSFET
.
Power ground.
The totem-pole output drive for the PFC MOSFET. This pin is internally clamped under
17V 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 has high impedance whenever the V
RMS
voltage is lower than a threshold.
GND
13
Ground
OPFC
14
PFC Gate Drive
VDD
15
Supply
RANGE
16
PFC Output
Voltage Control
OVP
17
PFC Over-Voltage
Input
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.
FBPFC
18
Voltage Feedback
Input for PFC
Error Amplifier
Output for PFC
Voltage Feedback
Loop
Input AC Current
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.
VEA
19
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.
IAC
20
This input is used to provide current reference for the multiplier.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SG6901ASZ | PFC / Flyback PWM Controller |
| SG6902 | Green-Mode PFC / Flyback-PWM Controller |
| SG6902SZ | Green-Mode PFC / Flyback-PWM Controller |
| SG6961 | Power Factor Controller |
| SG6961DZ | Power Factor Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SG6901ASZ | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 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(kāi)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 |
| SG6902 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green-Mode PFC / Flyback-PWM Controller |
| SG6902SZ | 功能描述:開(kāi)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(kāi)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(kāi)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(kāi)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 |
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