- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378722 > UCC2884 (Texas Instruments, Inc.) Frequency Foldback Current Mode PWM Controller PDF資料下載
參數(shù)資料
| 型號： | UCC2884 |
| 廠商： | 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 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 267K |
| 代理商： | UCC2884 |
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 |
|---|---|
| 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 |
| UCC2807PW-3 | Programmable Maximum Duty Cycle PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC2884D | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| UCC2885D | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| UCC28880D | 功能描述:Converter Offline Buck, Buck-Boost, Flyback Topology 62kHz 7-SOIC 制造商:texas instruments 系列:- 包裝:管件 零件狀態(tài):有效 輸出隔離:非隔離 內(nèi)部開關(guān):是 電壓 - 擊穿:700V 拓撲:降壓，降壓-升壓，反激式 電壓 - 啟動:3.9V 電壓 - 電源（Vcc/Vdd）:3.6 V ~ 5 V 占空比:55% 頻率 - 開關(guān):62kHz 功率（W）:- 故障保護:限流，過載，超溫，短路 控制特性:- 工作溫度:-40°C ~ 105°C（TA） 封裝/外殼:8-SOIC（0.154"，3.90mm 寬）7 引線 供應商器件封裝:7-SOIC 安裝類型:表面貼裝 標準包裝:75 |
| UCC28880DR | 功能描述:Converter Offline Buck, Buck-Boost, Flyback Topology 62kHz 7-SOIC 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 輸出隔離:非隔離 內(nèi)部開關(guān):是 電壓 - 擊穿:700V 拓撲:降壓，降壓-升壓，反激式 電壓 - 啟動:3.9V 電壓 - 電源（Vcc/Vdd）:3.6 V ~ 5 V 占空比:55% 頻率 - 開關(guān):62kHz 功率（W）:- 故障保護:限流，過載，超溫，短路 控制特性:- 工作溫度:-40°C ~ 105°C（TA） 封裝/外殼:8-SOIC（0.154"，3.90mm 寬）7 引線 供應商器件封裝:7-SOIC 安裝類型:表面貼裝 標準包裝:1 |
| UCC28880EVM-615 | 功能描述:UCC28880 - AC/DC, Non-Isolated 1, Non-Isolated Outputs Evaluation Board 制造商:texas instruments 系列:- 零件狀態(tài):有效 主要用途:AC/DC，非隔離式 輸出和類型:1，非隔離 功率 - 輸出:1.25W 電壓 - 輸出:12.5V 或 -12.5V 電流 - 輸出:100mA 電壓 - 輸入:85 ~ 265 VAC 穩(wěn)壓器拓撲:- 頻率 - 開關(guān):- 板類型:完全填充 所含物品:板 使用的 IC/零件:UCC28880 標準包裝:1 |
發(fā)布緊急采購，3分鐘左右您將得到回復。