- 您現(xiàn)在的位置：買賣IC網(wǎng) > Datasheet目錄38 > FAN4800ASNY (Fairchild Semiconductor)IC CTLR COMBO PFC/PWM 16-DIP Datasheet資料下載
參數(shù)資料
| 型號： | FAN4800ASNY |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 860K |
| 描述： | IC CTLR COMBO PFC/PWM 16-DIP |
| 標準包裝： | 30 |
| 模式： | 平均電流 |
| 頻率 - 開關(guān)： | 240kHz ~ 268kHz |
| 電流 - 啟動： | 30µA |
| 電源電壓： | 11 V ~ 26 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(yīng)商設(shè)備封裝： | 16-DIP |
| 包裝： | 管件 |
?2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN4800AS/CS/01S/02S " Rev. 1.0.2
16
PWM Control (RAMP)
When the PWM section is used in current mode, RAMP
is generally used as the sampling point for a voltage,
representing the current in the primary of the PWMs
output transformer. The voltage is derived either from a
current-sensing resistor or a current transformer. In
voltage mode, RAMP is the input for a ramp voltage
generated by a second set of timing components (R
RAMP
,
C
RAMP
) that have a minimum value of 0V and a peak
value of approximately 6 V. In voltage mode,
feedforward from the PFC output bus is an excellent
way to derive the timing ramp for the PWM stage.
Generating V
DD
After turning on the FAN4800AS/CS/01S/02S at 11 V,
the operating voltage can vary from 9.3 V to 28 V. The
threshold voltage of the V
DD
OVP comparator is 28 V
and its hysteresis is 1 V. When V
DD
reaches 28 V,
OPFC is LOW and the PWM section is not disturbed.
There are two ways to generate V
DD
: use auxiliary
power supply around 15 V or use bootstrap winding to
self-bias the FAN4800AS/CS/01S/02S system. The
bootstrap winding can be taped from the PFC boost
choke or the transformer of the DC-to-DC stage.
Leading/Trailing Edge Modulation
Conventional PWM techniques employ trailing-edge
modulation, in which the switch turns on right after the
trailing edge of the system clock. The error amplifier
output is then compared with the modulating ramp up.
The effective duty cycle of the trailing-edge modulation
is determined during the on-time of the switch.
In the case of leading-edge modulation, the switch is
turned off exactly at the leading edge of the system
clock. When the modulating ramp reaches the level of
the error amplifier output voltage, the switch is turned
on. The effective duty-cycle of the leading-edge
modulation is determined during off-time of the switch.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FAN4800AUN | IC PWM/PFC CTLR COMBO 16-MDIP |
| FAN4800CUN | IC PWM/PFC CTLR COMBO 16-MDIP |
| FAN4802MY | IC PFC CTRLR AVERAGE CURR 16SOP |
| FAN4802SNY | IC CTLR PFC/PWM COMBO 16-PDIP |
| FAN6920MRMY | IC PWM CTLR PFC/QUASI-RES 16SOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN4800AU | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PFC/ PWM Controller Combination |
| FAN4800AUM | 功能描述:電流型 PWM 控制器 PFC + PWM Controller Combo 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 |
| FAN4800AUN | 功能描述:電流型 PWM 控制器 PFC + PWM Controller Combo 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 |
| 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(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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。