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參數資料
| 型號： | FAN4803 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 8-Pin PFC and PWM Controller Combo |
| 中文描述： | 8引腳PFC和PWM組合控制器 |
| 文件頁數： | 7/12頁 |
| 文件大?。?/td> | 103K |
| 代理商： | FAN4803 |
PRODUCT SPECIFICATION
FAN4803
REV. 1.2.3 11/2/04
7
Internal Voltage Ramp
The internal ramp current source is programmed by way of
the VEAO pin voltage. Figure 7 displays the internal ramp
current vs. the VEAO voltage. This current source is used to
develop the internal ramp by charging the internal 30pF +12/
–10% capacitor. See Figures 10 and 11. The frequency of the
internal programming ramp is set internally to 67kHz.
PFC Current Sense Filtering
In DCM, the input current wave shaping technique used by
the FAN4803 could cause the input current to run away.
In order for this technique to be able to operate properly
under DCM, the programming ramp must meet the boost
inductor current down-slope at zero amps. Assuming the
programming ramp is zero under light load, the OFF-time
will be terminated once the inductor current reaches zero.
R
f
×
C
COMP
COMP
1
(3)
(4)
2
× π ×
R
Hz
×
1
nF
k
COMP
1
628
×
30
.
16
330
C
f
R
ZERO
COMP
2
× π
×
×
10
C
Hz
×
k
μ
F
ZERO
1
628
×
3
.
330
016
.
=
=
=
=
=
=
Figure 4. Voltage Control Loop
FAN4803
FAN4803
IVEAO
34
μ
A
IOUT
VO
220
μ
F
RLOAD
667
330k
11.3M
0.15
μ
F
15nF
POWER
STAGE
COMPENSATION
VEAO
VEAO +
–
Figure 5. Voltage Loop Gain
60
40
20
0
–
20
–
40
–
60
G
FREQUENCY (Hz)
0.1
10
1000
1
100
Power Stage
Overall Gain
Compensation
Network Gain
Figure 6. Voltage Loop Phase
0
50
100
150
200
P
o
)
FREQUENCY (Hz)
0.1
1
10
1000
100
Power Stage
Overall
Compensation
Network
Figure 7. Internal Ramp Current vs. VEAO
50
40
30
20
10
0
I
μ
A
VEAO (V)
0
2
7
5
1
3
6
4
FF @
–
55
o
C
TYP @
–
55
o
C
TYP @ 155
o
C
SS @ 155
o
C
TYP @ ROOM TEMP
相關PDF資料 |
PDF描述 |
|---|---|
| FAN4810 | Power Factor Correction Controller |
| FAN4810M | Power Factor Correction Controller |
| FAN4810MX | Power Factor Correction Controller |
| FAN4810N | Terminal Block RoHS Compliant: Yes |
| FAN4822 | ZVS Average Current PFC Controller |
相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN4803CP1 | 功能描述:功率因數校正 IC PFC/PWM Controller Combo RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| FAN4803CP-1 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:8-Pin PFC and PWM Controller Combo |
| FAN4803CP1_Q | 功能描述:功率因數校正 IC PFC/PWM Controller Combo RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| FAN4803CP2 | 功能描述:功率因數校正 IC PFC/PWM Controller Combo RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| FAN4803CP-2 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:8-Pin PFC and PWM Controller Combo |
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