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參數資料
| 型號： | FAN4800AUN |
| 廠商： | Fairchild Semiconductor |
| 文件頁數： | 13/19頁 |
| 文件大小： | 1414K |
| 描述： | IC PWM/PFC CTLR COMBO 16-MDIP |
| 標準包裝： | 1,800 |
| 模式： | 平均電流 |
| 頻率 - 開關： | 240kHz ~ 268kHz |
| 電流 - 啟動： | 30µA |
| 電源電壓： | 11 V ~ 22 V |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 16-MDIP |
| 包裝： | 管件 |
?2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN4800AU/CU " Rev. 1.0.1
13
Functional Description
Oscillator
The internal oscillator frequency is determined by the
timing resistor and capacitor on the RT/CT pins as
shown in Figure 25. The frequency of the internal
oscillator is given:
T
T
T
O SC
C
C
R
360
56
.
0
1
+
?/DIV>
?/DIV>
=
(1)
Because the PWM stage generally uses a forward
converter, it is necessary to limit the maximum duty
cycle at 50%. To have a small tolerance of the
maximum duty cycle, a frequency divider with toggle
flip-flops is used, as illustrated in Figure 25. The
operation frequency of PFC and PWM stage is 1/4 of
oscillator frequency. (For FAN4800CU, the operation
frequencies for PFC and PWM stages are 1/4 and 1/2
of oscillator frequency, respectively).
The dead time for the PFC gate drive signal is
determined by:
T
D E A D
C
3 6 0
=
(2)
The dead time should be smaller than 2% of the
switching period to minimize line current distortion
around the line zero crossing.
RT /C T
V
RE F
O S C
T Q
T -F F
T
Q
O P W M (F A N 4 8 0 0 C U )
O P F C , O P W M
T -F F
Figure 25. Oscillator Configuration
R T / C T
O P F C
O P W M
O P W M ( F A N 4 8 0 0 C U )
P F C D e a d - T i m e
Figure 26. Timing Diagram
I
D
I
D S
V
G . P F C
V
G .P W M
V
G . P F C
V
G . P W M
I
D S
I
D
Figure 27. Interleaved Leading / Trailing
Edge Modulation
Figure 27 shows the interleaved leading / trailing edge
modulation, where the turn-off of the PFC drive signal is
synchronized to the turn-on of the PWM drive signal.
This technique allows the PFC output diode current to
flow directly into the downstream DC/DC converter,
minimizing the current ripple of PFC output capacitor.
Gain Modulator
Gain modulator is the key block for the PFC stage
because it provides the reference to the current control
error amplifier for the input current shaping, as shown in
Figure 28. The output current of the gain modulator is a
function of V
EA
, I
AC,
and V
RMS
. The gain of the gain
modulator is given as a ratio between I
MO
and I
AC
with a
given V
RMS
when V
EA
is saturated to HIGH. The gain is
inversely proportional to V
RMS
2
, as shown in Figure 29,
to implement line feed-forward. This automatically
adjusts the reference of current control error amplifier
according to the line voltage, such that the input power
of PFC converter is not changed with line voltage (as
shown in Figure 30).
IS E N S E
IA C
V R M S
V E A
=
?/DIV>
?nbsp -
= ?/DIV>
-
2
( 0
. 6
)
.
M O A
C
E
A
A
C
M
A
X
G
I
K
V
I
V V
IE A
R M
R
M
G a in
M o d u la to r
R R M S 1
R R M S 2
R
R M S 3
C R M S 1
C
R M S 2
R
I A C
I A C
V
I N
I
L
x
2
k
Figure 28. Gain Modulator Block
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相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN4800C | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PFC/PWM Controller Combination |
| FAN4800CMY | 功能描述:電流型 PWM 控制器 PWM/PFC, Avg Curr 30uA SU, 2.6mA Op RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| FAN4800CNY | 功能描述:電流型 PWM 控制器 PWM/PFC, Avg Curr 30uA SU, 2.6mA Op RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| FAN4800CS | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PFC/PWM Controller Combination |
| FAN4800CSMY | 功能描述:電流型 PWM 控制器 PFC/PWM Controller Combination RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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