- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄378722 > UCC1884 (Texas Instruments, Inc.) Frequency Foldback Current Mode PWM Controller PDF資料下載
參數(shù)資料
| 型號(hào)： | UCC1884 |
| 廠(chǎng)商： | Texas Instruments, Inc. |
| 英文描述： | Frequency Foldback Current Mode PWM Controller |
| 中文描述： | 頻率折返電流模式PWM控制器 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 267K |
| 代理商： | UCC1884 |
UCC1884
UCC2884
UCC3884
PRELIMINARY
SLUS160A - AUGUST 1999
FEATURES
Frequency Foldback Reduces
Operating Frequency Under Fault
Conditions
Accurate Programmable Volt-Second
Clamp
Programmable Maximum Duty Cycle
Clamp
Oscillator Synchronization
Overcurrent Protection
Shutdown with Full Soft Start
Wide Gain Bandwidth Amplifier
(GBW > 2.5MHz)
Current Mode Operation
Precision 5V Reference
Frequency Foldback Current Mode PWM Controller
BLOCK DIAGRAM
UDG-96026-1
DESCRIPTION
The UCC3884 is a high performance current mode PWM controller in-
tended for single ended switch mode power supplies. The chip implements
a frequency foldback scheme that decreases the oscillator frequency as
the output voltage falls below a programmed value. This technique de-
creases the average output current sourced into a low impedance load
which can occur during an output short circuit or overload condition. Ex-
cessive short circuit current is more prevalent in high frequency converters
where the propagation delay and switch turn-off time forces a minimum at-
tainable duty cycle. An accurate volt-second clamp limits the duty cycle
during line or load transient conditions which could otherwise saturate the
transformer. The volt-second clamp may also be used with an external
overvoltage protection circuit to handle fault conditions such as current
sense disconnect or current transformer saturation. The frequency
foldback, volt-second clamp, cycle-by-cycle current limit, and overcurrent
shutdown provide a rich set of protection features for use in peak current
mode pulse width modulators.
application
INFO
available
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UCC2884 | Frequency Foldback Current Mode PWM Controller |
| UCC1888 | Off-line Power Supply Controller |
| UCC2888 | Off-line Power Supply Controller |
| UCC1926 | 【 20A Integrated Current Sensor |
| UCC2807PWTR-3 | Programmable Maximum Duty Cycle PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC1884J | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Current-Mode SMPS Controller |
| UCC1884Q | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Industrial Control IC |
| UCC1885J | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Voltage-Mode SMPS Controller |
| UCC1888 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Off-line Power Supply Controller |
| UCC1888J | 制造商:Texas Instruments 功能描述:- Rail/Tube |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。