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参数资料
| 型号： | SG6901ASZ |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 16/19页 |
| 文件大小： | 714K |
| 描述： | IC PFC CTLR AVERAGE CURR 20SOIC |
| 标准包装： | 1 |
| 模式： | 平均电流 |
| 频率 - 开关： | 65kHz |
| 电流 - 启动： | 10µA |
| 电源电压： | 12 V ~ 20 V |
| 工作温度： | -30°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 标准包装 |
| 其它名称： | SG6901ASZDKR |
?2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
SG6901A " Rev. 1.0.2
16
To achieve good power factor, the voltage for V
RMS
and
V
EA
should be kept as constant as possible, according
to Equation 5. Good RC filtering for V
RMS
and narrow
bandwidth (lower than the line frequency) for voltage
loop are suggested for better input current shaping.
The transconductance error amplifier has output
impedance ZO and a capacitor C
EA
(1礔 ~ 10礔)
should be connected to ground. This establishes a
dominant pole f1 for the voltage loop:
EA
O
1
C
Z
2
1
f
?/DIV>
?/DIV>
=
?/DIV>
(5)
The average total input power can be expressed as:
AC
EA
2
RMS
EA
AC
RMS
2
RMS
EA
AC
RMS
MO
RMS
(rms)
IN
(rms)
IN
R
V
2
V
V
R
Vin
V
V
V
I
V
I
V
I
V
Pin
?/DIV>
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
(6)
From Equation 6, V
EA
, the output of the voltage error
amplifier, controls the total input power and the power
delivered to the load.
Figure 26. 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.
0 shows the block diagram of the multi-vector error
amplifier. When the variation of the feedback voltage
exceeds ?% of the reference voltage, the
transconductance error amplifier adjusts its output
impedance to increase the loop response.
Figure 27. 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
OVPPFC, the OPFC is disabled. THE OPFC is not
enabled again until the OVP voltage falls below
OVPPFC.
Cycle-by-Cycle Current Limiting
SG6901A provides cycle-by-cycle current limiting for
both PFC and PWM stages. Figure 28 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 28.
The amplitude of the constant current, I
p
, is determined
by the internal current reference according to:
I
P
R
1.2V
2
I
?/DIV>
=
(8)
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相关代理商/技术参数 |
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|---|---|
| SG6902 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green-Mode PFC / Flyback-PWM Controller |
| SG6902SZ | 功能描述:开关变换器、稳压器与控制器 Grn Mode PFC/Flyback PWM Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SG6903SZ | 功能描述:开关变换器、稳压器与控制器 Highly-Integrated Grn Mode PWM Cntrl RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SG6905 | 制造商:FAIRCHILD 制造商全称: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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