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参数资料
| 型号： | FL7930BM |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/23页 |
| 文件大小： | 0K |
| 描述： | IC PFC CTLR FLYBACK/BOUND 8SOICN |
| 标准包装： | 95 |
| 类型： | 镇流器控制器 |
| 频率： | 250kHz ~ 350kHz |
| 电流 - 电源： | 2.5mA |
| 电源电压： | 13 V ~ 20 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOP |
| 包装： | 管件 |
Applications Information
1. Startup : Normally, supply voltage (V CC ) of a PFC
V OUTPFC
block is fed from the additional power supply, which can
be called standby power. Without this standby power,
2 nd OVP
high
2.885V
auxiliary winding for zero current detection can be used
as a supply source. Once the supply voltage of the PFC
block exceeds 12 V, internal operation is enabled until
2.885
OVP
disable
disable
2.5
2.675
2.675V/2.5V
2
OVP
the voltage drops to 8.5 V. If V CC exceeds V Z , 20 mA
current is sinking from V CC .
INV Open
0.35
0.45
0.45V/0.35V
V IN
PFC
PFC Inductor
V OUT
PFC
2.5V
INV
1
Aux. Winding
3
COMP
FL7930B Rev. 00
External V CC circuit
when no standby power exists.
Figure 24.
Circuit Around INV Pin
V OUTPFC
390V DC
413V
390V
V REF
2.5V REF
V CC ’
H:open
8
V CC
V BIAS
internal
bias
reset
-
+
V Z
70V
55V
V TH(S/S) 20mA
V INV
8.5
12
2.50V
2.65V
2.50V
2.24V
1.64V
Figure 23.
Startup Circuit
0.45V
0.35V
V CC
15V
2. INV Block : Scaled-down voltage from the output is
the input for the INV pin. Many functions are embedded
based on the INV pin: transconductance amplifier,
2.0V
I OUTCOMP
output OVP comparator, and disable comparator.
For the output voltage control, a transconductance
amplifier is used instead of the conventional voltage
Disable
Current Sourcing
I sinking
Current Sourcing
amplifier. The transconductance amplifier (voltage-
controlled current source) aids the implementation of
the OVP and disable functions. The output current of
OVP
V CC <2V, internal logic is not alive.
- Internal signals are unknown.
t
the amplifier changes according to the voltage
difference of the inverting and non-inverting input of
the amplifier. To cancel down the line input voltage
Figure 25.
Timing Chart for INV Block
effect on power factor correction, the effective control
3.
OVP Pin :
Over-Voltage
Protection (OVP) is
response of the PFC block should be slower than the
line frequency and this conflicts with the transient
response of the controller. Two-pole one-zero type
compensation can meet both requirements.
The OVP comparator shuts down the output drive block
when the voltage of the INV pin is higher than 2.675 V
and there is 0.175 V hysteresis. The disable comparator
disables operation when the voltage of the inverting input
is lower than 0.35 V and there is 100 mV hysteresis. An
external small-signal MOSFET can be used to disable the
IC, as shown in Figure 24. The IC operating current
decreases to reduce power consumption if the IC is
disabled. Figure 25 is the timing chart of the internal
circuit near the INV pin when rated PFC output voltage is
390 V DC and V CC supply voltage is 15 V.
? 2010 Fairchild Semiconductor Corporation
FL7930B ? Rev. 1.0.4
12
embedded by the information at the INV pin. That
information comes from the output through the voltage
dividing resistors. To scale down from a high voltage to
a low one, high resistance is normally used with low
resistance. If the resistor of high resistance gets
damaged and resistance is changed to high, though INV
pin information is normal, output voltage exceeds its
rated output. If this occurs, the output electrolytic
capacitor may be damaged. To prevent such a
catastrophe additional OVP pin is assigned to double-
check output voltage. Additional OVP may be called
“second” OVP, while INV pin OVP is called “first” OVP.
Since the two OVP conditions are quite different, the
protection recovering mode is different.
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FL7930BMX | 功能描述:功率因数校正 IC PFC Controller for Lighting; 2nd OVP RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| FL7930BMX_G | 制造商:Fairchild Semiconductor Corporation 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述:IC PFC CTLR FLYBACK/BOUND 8SOIC |
| FL7930CM | 功能描述:功率因数校正 IC PFC Controller for Lighting; PFC Ready RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| FL7930CMX | 功能描述:功率因数校正 IC Single Stage Flyback PFC Controller RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| FL7930CMX_G | 制造商:Fairchild Semiconductor Corporation 功能描述:IC PFC CTLR FLYBACK/BOUND 8SOIC |
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