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| 型號： | UCC3888N |
| 英文描述： | 5 V supervisor with battery switchover |
| 中文描述： | 電壓模式開關(guān)電源控制器 |
| 文件頁數(shù)： | 8/19頁 |
| 文件大小： | 296K |
| 代理商： | UCC3888N |
SLUS458C AUGUST 2001 REVISED SEPTEMBER 2003
8
www.ti.com
APPLICATION INFORMATION
oscillator synchronization
The UCC38C4x oscillator has the same synchronization characteristics as the original bipolar devices. Thus,
the information in the Application Note U100A
, UC3842/3/4/5 Provides Low-Cost Current-Mode Contro
l, (TI
Literature No. SLUA143) still applies. The application note describes how a small resistor from the timing
capacitor-to-ground can offer an insertion point for synchronization to an external clock, (see Figures 2 and 3).
Figure 2 shows how the UCC38C42 can be synchronized to an external clock source. This allows precise
control of frequency and dead time with a digital pulse train.
UDG01069
8
4
VREF
RT/ CT
UCC38C42
PWM
RT
CT
24
SYNCHRONIZATION
CIRCUIT INPUT
Figure 2. Oscillator Synchronization Circuit
ON
.
LOW
LOW
HIGH
ON
.
OFF
.
CLOCK
INPUT
PWM
OUT
UPPER THRESHOLD
LOWER THRESHOLD
OUTPUT A
COMBINED
UPPER THRESHOLD
LOWER THRESHOLD
V
CT
V
CT
(ANALOG)
V
SYNC
(DIGITAL)
UDG01070
Figure 3. Synchronization to an External Clock
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC3888NG4 | 功能描述:電壓模式 PWM 控制器 Off-line Power Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC3889 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Off-line Power Supply Controller |
| UCC3889D | 功能描述:電壓模式 PWM 控制器 Off-Line Cntlr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC3889DG4 | 功能描述:電壓模式 PWM 控制器 Off-line Power Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC3889DTR | 功能描述:電壓模式 PWM 控制器 Off-line Power Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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