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參數(shù)資料
| 型號： | SG6901ASZ |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PFC / Flyback PWM Controller |
| 中文描述： | POWER FACTOR CONTROLLER, 68 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 0.300 INCH, ROHS COMPLIANT, MS-013AC, SOP-20 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大小： | 716K |
| 代理商： | SG6901ASZ |
Product Specification
PFC / Flyback PWM Controller
SG6901A
System General Corp.
Version 1.0.1 (IAO33.0062.B0)
- 15 -
www.sg.com.tw www.fairchildsemi.com
September 26, 2007
FIG.4 Average-Current-Mode Control Loop
Multi-Vector Error Amplifier
Although the PFC stage has a low bandwidth voltage loop
for better input power factor, the innovative multi-vector
error amplifier provides a fast transient response to clamp
the overshoot and undershoot of the PFC output voltage.
Figure 5 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.
FIG. 5 Multi-Vector Error Amplifier
PFC Over-Voltage Protection
Using a voltage divider from the output of PFC to the
OVP pin, the PFC output voltage can be safely protected.
Once the voltage on the OVP pin is over OVP
PFC
, the
OPFC is disabled. THE OPFC is not enabled again until
the OVP voltage falls below OVP
PFC
.
Cycle-by-Cycle Current Limiting
SG6901A provides cycle-by-cycle current limiting for
both PFC and PWM stages. Figure 6 shows the peak
current limit for the PFC stage. The PFC gate drive is
terminated once the voltage on the ISENSE pin goes
below V
PK
.
The voltage of V
RMS
determines the voltage of V
PK
. The
relationship between V
PK
and V
RMS
is shown in Figure 6.
The amplitude of the constant current, I
P
, is determined by
the internal current reference according to the equation:
I
P
R
1.2V
2
=
I
×
---------------------
(8)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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: |
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