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參數(shù)資料
| 型號： | UC3874DWTR-1 |
| 英文描述： | Triple 3-input NAND gate |
| 中文描述： | 電流模式開關(guān)電源控制器 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 490K |
| 代理商： | UC3874DWTR-1 |
A unique protection feature incorporated in the UC3871
is the Open Lamp Detect circuit. An open lamp interrupts
the current feedback loop and causes very high secon-
dary voltage. Operation in this mode will usually break-
down the transformer’s insulation, causing permanent
damage to the converter. The open lamp detect circuit,
shown in Figure 3 senses the lamp current feedback sig-
nal at the error amplifiers input, and shuts down the out-
puts if insufficient signal is present. Soft-start circuitry
limits initial turn-on currents and blanks the open lamp
detect signal.
Other features are included to minimize external circuitry
requirements. A logic level enable pin shuts down the IC,
allowing direct connection to the battery. During shut-
down, the IC typically draws less than 1
μ
A. The UC3871,
operating from 4.5V to 20V, is compatible with almost all
battery voltages used in portable computers. Under-volt-
age lockout circuitry disables operation until sufficient
supply voltage is available, and a 1% voltage reference
insures accurate operation. Both inputs to the LCD sup-
ply error amplifier are uncommitted, allowing positive or
negative supply loop closure without additional circuitry.
The LCD supply modulator also incorporates cycle-by-
cycle current limiting for added protection.
Figure 3
UC1871
UC2871
UC3871
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD.
MERRIMACK, NH 03054
TEL. (603) 424-2410
FAX (603) 424-3460
APPLICATION INFORMATION (cont.)
Figure 2
UC1871 Open Lamp Detect Circuitry
UC3871 Oscillator Section
5
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UC3874DWTR-2 | Current-Mode SMPS Controller |
| UC3874QTR-1 | 3 to 8 line decoder (inverting) |
| UC3874QTR-2 | 3 to 8 line decoder (inverting) |
| UC3875DWP | Hex Schmitt inverter |
| UC3875N | Quad 2 channel multiplexer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3874DWTR-1G4 | 功能描述:DC/DC 開關(guān)控制器 Hi Eff Synch Step down Buck Cntrlr 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 |
| UC3874DWTR-2G4 | 制造商:Texas Instruments 功能描述:HIGH EFFICIENCY, SYNCHRONOUS, STEP-DOWN (BUCK) CONTROLLER - Tape and Reel |
| UC3874N-1 | 功能描述:DC/DC 開關(guān)控制器 Hi Eff Synch Step down Buck Cntrlr 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 |
| UC3874N-1G4 | 功能描述:DC/DC 開關(guān)控制器 Hi Eff Synch Step down Buck Cntrlr 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 |
| UC3874N-2 | 功能描述:DC/DC 開關(guān)控制器 Hi Eff Synch Step down Buck Cntrlr 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 |
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