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參數(shù)資料
| 型號： | FAN7554 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Versatile PWM Controller |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大?。?/td> | 1006K |
| 代理商： | FAN7554 |
FAN7554
11
Gate Driver
The gate drive circuit has the totem-pole output configuration. The output has 1A peak current and 200mA average current
drive ability.
ON/OFF Control
The FAN7554 is able to use the feedback pin for ON/OFF control by placing NPN transistor between the cathode of the
KA431 and ground as shown in figure 19. When the transistor turns on, the current flows through the photo diode and
saturates the photo transistor. As a result, the feedback voltage is dropped to zero. When the feedback voltage is below 0.3V,
the soft start voltage starts to discharge by connecting the internal resistor 1k
in parallel with the external capacitor Cs. When
the soft start voltage becomes less than 1.5V, all the blocks in the FAN7554 are turned off , with the exceptions of the UVLO
block and ON/OFF control block. The operation current is about 200uA. So the stand-by power is reduced and SMPS
efficiency is improved. When the feedback voltage exceeds 0.3V, the FAN7554 normally operates by turning on Vref block.
Figure 17
-
B . Delayed Shutdown & Feedback Waveform
t
Vfb
Slope (dv/dt) = 5uA / Cfb
3V
6V
Shutdown start point
t2
t1
Figure 18. Gate Drive Circuit
DRAIN
FAN7554
6
7
Clock
Shutdown
Q
OUT
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PDF描述 |
|---|---|
| FAN7556 | Voltage Mode PWM Controller |
| FAN7556M | SMPS Controller |
| FAN7556MX | SMPS Controller |
| FAN7563 | Lithium-Ion Charger Controller |
| FAN7564 | Lithium-Ion Charger Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN7554_03 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Versatile PWM Controller |
| FAN7554D | 功能描述:DC/DC 開關(guān)控制器 PWM Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| FAN7554D_Q | 功能描述:電流型 PWM 控制器 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 |
| FAN7554DTF | 功能描述:DC/DC 開關(guān)控制器 PWM Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| FAN7554DTF_Q | 功能描述:電流型 PWM 控制器 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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