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| 型号： | FL7930BM |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 17/23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 |
10. V IN -Absent Detection : To reduce power loss
caused by input voltage sensing resistors and to
optimize THD, the FL7930B omits AC input voltage
detection. Therefore, no information about AC input is
available from the internal controller. In many cases, the
V CC of PFC controller is supplied by an independent
power source like standby power. In this scheme, some
mismatch may exist. For example, when the electric
power is suddenly interrupted during two or three AC
line periods; V CC is still live during that time, but output
voltage drops because there is no input power source.
Consequently, the control loop tries to compensate for
the output voltage drop and V COMP reaches its
maximum. This lasts until AC input voltage is live again.
V OUT
V IN
V AUX
Though V IN is eliminated,
operation of controller is
normal due to the large
bypass capacitor.
When AC input voltage is live again, high V COMP allows
high switching current and more stress is put on the
MOSFET Gate
D MAX
f MIN
f MIN
D MIN
MOSFET and diode. To protect against this, FL7930B
checks if the input AC voltage exists. If input does not
exist, soft-start is reset and waits until AC input is live
again. Soft-start manages the turn-on time for smooth
operation when it detects AC input is applied again and
applies less voltage and current stress on startup.
V OUT
V IN
Though V IN is eliminated,
operation of controller is
NewV COMP
I DS
Figure 43.
Input Voltage Absent Detected
Smooth Soft-
Start
With V IN -Absent Circuit
t
normal due to the large
bypass capacitor.
11. Current Sense : The MOSFET current is sensed
using an external sensing resistor for over-current
V AUX
protection. If the CS pin voltage is higher than 0.8 V, the
over-current
protection comparator generates a
protection signal. An internal RC filter of 40 kΩ and 8 pF
is included to filter switching noise.
MOSFET Gate
f MIN
D MAX
12. Gate Driver Output : FL7930B contains a single
totem-pole output stage designed for a direct drive of
the power MOSFET. The drive output is capable of up
V COMP
I DS
Figure 42.
High Drain
Current!
Without V IN -Absent Circuit
t
to +500 / -800 mA peak current with a typical rise and
fall time of 50 ns with 1 nF load. The output voltage is
clamped to 13 V to protect the MOSFET gate even if the
V CC voltage is higher than 13 V.
? 2010 Fairchild Semiconductor Corporation
FL7930B ? Rev. 1.0.4
17
www.fairchildsemi.com
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| 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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