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参数资料
| 型号： | FL7930CM |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.5 A POWER FACTOR CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | MS-012AA, SOP-8 |
| 文件页数： | 9/20页 |
| 文件大小： | 1290K |
| 代理商： | FL7930CM |
2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL7930 Rev. 1.0.0
17
FL7930
—
Single-Stage
Flyback
and
Bou
ndary-Mode
PFC
Controller
for
Lighting
Figure 44. Circuit of THD Optimizer
Figure 45. Effect of THD Optimizer
By THD optimizer, turn-on time over one AC line period
is proportionally changed, depending on input voltage.
Near the zero cross, lengthened turn-on time improves
THD performance.
11. Input Voltage Absent Detection
: To save power
loss caused by input voltage-sensing resistors and to
optimize THD, FL7930 omits AC input voltage detection.
Therefore, no information about AC input is available
from the internal controller. In many cases, the VCC 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; VCC is still alive 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 VCOMP reaches its
maximum. This lasts until AC input voltage is live again.
When AC input voltage is live again, high VCOMP allows
high switching current and more stress is put on the
MOSFET and diode. To protect against this, FL7930
internally 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,
which applies less voltage and current stress on startup.
Figure 46. Operation without Input Voltage
Absent Circuit
Figure 47. Operation with Input Voltage
Absent Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| FL793-F8 | 制造商:BACO Controls Inc 功能描述: |
| FL7B5BH | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Ball-Grid-Array Thin Film Low-Pass Filter |
| FL7KM12A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:TRANSISTOR | MOSFET | N-CHANNEL | 600V V(BR)DSS | 7A I(D) | TO-220FN |
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