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參數(shù)資料
| 型號： | FAN6920MRMY |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 19/24頁 |
| 文件大小： | 1490K |
| 描述： | IC PWM CTLR PFC/QUASI-RES 16SOP |
| 標準包裝： | 1 |
| 模式： | 臨界傳導（CRM） |
| 電流 - 啟動： | 20µA |
| 電源電壓： | 12 V ~ 25 V |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應商設(shè)備封裝： | 16-SOP |
| 包裝： | 標準包裝 |
| 其它名稱： | FAN6920MRMYDKR |
?2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6920MR " Rev. 1.0.8
19
PFC Burst Mode
To minimize the power dissipation at light-load
condition, the FAN6920MR PFC control enters burst-
mode operation. As the load decreases, the PWM
feedback voltage (V
FB
) decreases. When V
FB
< V
CTRL-
PFC-BM
for 100 ms, the device enters PFC burst mode,
the V
COMP
pulls high to V
COMP-H
, and PFC output voltage
increases. When the PFC feedback voltage on INV pin
(V
INV
) triggers the OVP threshold voltage (V
INV-OVP
),
V
COMP
pulls low to V
COMP-L
, the OPFC pin switching
stops and the PFC output voltages start to drop. Once
the V
INV
drops below the feedback comparator reference
voltage (V
REF
), V
COMP
pulls high to V
COMP-H
and OPFC
starts switching again. Burst-mode operation alternately
enables and disables switching of the power MOSFET
to reduce the switching loss at light-load condition.
P F C B urst M ode
V
CO M P -H
V
CO M P
E nter P F C B urst M ode
O PFC
V
INV
V
C O M P -L
N orm al
M
V
IN V -O V P
V
R E F
Figure 36. PFC Burst Mode Behavior
The V
COMP-H
is adjusted by the VIN pin voltage, as
shown in Figure 37. Since the VIN pin is connected to
rectified AC input line voltage through the resistive
divider, a higher line voltage generates a higher VIN pin
voltage. The V
COMP-H
decreases as VIN pin voltage
increases, limiting the PFC choke current at a higher
input voltage to reduce acoustic noise. If the V
COMP-H
is
below the PFC V
OZ
, the PFC automatically shuts down
at light load with high line voltage input condition.
0.7
0.9
1.1
1.3
1.5
1.7
1.9
2.1
2.3
1.2
1.7
2.2
2.7
3.2
3.7
4.2
V
V IN
(V )
V
OZ
Figure 37. V
COMP-H
Voltage vs. V
VIN
Voltage
Characteristic Curve
PWM Stage
HV Startup and Operating Current (HV Pin)
The HV pin is connected to the AC line through a
resistor (refer to Figure 1). With a built-in high-voltage
startup circuit, when AC voltage is applied to the power
system, FAN6920MR provides a high current to charge
the external V
DD
capacitor to speed up controllers
startup time and build up normal rated output voltage
within three seconds. To save power consumption, after
V
DD
voltage exceeds turn-on voltage and enters normal
operation; this high-voltage startup circuit is shut down
to avoid power loss from startup resistor.
Figure 38 shows the characteristic curve of V
DD
voltage
and operating current I
DD
. When V
DD
voltage is lower
than V
DD-PWM-OFF
, FAN6920MR stops all switching
operation and turns off unnecessary internal circuits to
reduce operating current. By doing so, the period from
V
DD-PWM-OFF
to V
DD-OFF
can be extended and the hiccup
mode frequency can be decreased to reduce the input
power in case of output short circuit. Figure 39 shows
the typical waveforms of V
DD
voltage and gate signal
with hiccup mode operation.
I
DD-OP
I
DD-PWM-OFF
I
DD-ST
V
DD
V
DD-OFF
V
DD-ON
V
DD-PWM-OFF
I
DD
Figure 38. V
DD
vs. I
DD-OP
Characteristic Curve
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| FAN6921 | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN6921AMLMY | 功能描述:電流型 PWM 控制器 PFC/Quasi-Resonant PWM Controller RoHS:否 制造商:Texas Instruments 開關(guān)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(shù)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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| FAN6921MLMY | 功能描述:電流型 PWM 控制器 Critical Mode PFC Quasi-Resant PWM cnt RoHS:否 制造商:Texas Instruments 開關(guān)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(shù)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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