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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： | 10/20页 |
| 文件大小： | 1290K |
| 代理商： | FL7930CM |
2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FL7930 Rev. 1.0.0
18
FL7930
—
Single-Stage
Flyback
and
Bou
ndary-Mode
PFC
Controller
for
Lighting
12. Current Sense
: The MOSFET current is sensed
using an external sensing resistor for the over-current
protection. If the CS pin voltage is higher than 0.8V, the
over-current
protection
comparator
generates
a
protection signal. An internal RC filter of 40k and 8pF
is included to filter switching noise.
13. Gate Driver Output
: FL7930 contains a single
totem-pole output stage designed for a direct drive of
the power MOSFET. The drive output is capable of up
to +500/-800mA peak current with a typical rise and fall
time of 50ns with 1nF load. The output voltage is
clamped to 13V to protect the MOSFET gate even if the
VCC voltage is higher than 13V.
14. PCB Layout
PFC block normally handles high switching current and
the voltage low-energy signal path can be affected by
the high-energy path. Cautious PCB layout is mandatory
for stable operation.
The gate drive path should be as short as possible.
The closed-loop that starts from the gate driver,
MOSFET gate, and MOSFET source to ground of
PFC controller is recommended as close as
possible. This is also the crossing point between
power ground and signal ground. Power ground
path from the bridge diode to the output bulk
capacitor should be short and wide. The sharing
position between power ground and signal ground
should be only at one position to avoid ground loop
noise. Signal path of PFC controller should be short
and wide for external components to contact.
PFC output voltage sensing resistor is normally
high to reduce current consumption. This path can
be affected by external noise. To reduce noise
possibility at the INV pin, a shorter path for output
sensing is recommended. If a shorter path is not
possible, place some dividing resistors between
PFC output and the INV pin — closer to the INV pin
is better. Relative high voltage close to the INV pin
can be helpful.
ZCD path is recommended close to auxiliary
winding from boost inductor and to the ZCD pin. If
that is difficult, place a small capacitor (below 50pF)
to reduce noise.
Switching current-sense path should not share with
any other path to avoid interference. Some
additional components may be needed to reduce
the noise level applied to the CS pin.
A stabilizing capacitor for VCC is recommended as
close as possible to the VCC and ground pins. If it is
difficult, place the SMD capacitor as close to the
corresponding pins as possible.
Figure 48. Recommended PCB Layout
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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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