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參數(shù)資料
| 型號(hào)： | UC2871DWTR |
| 英文描述： | Intelligent quad (2x5A/2x2.5A ) low-side switch |
| 中文描述： | 諧振模式開(kāi)關(guān)電源控制器 |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大?。?/td> | 490K |
| 代理商： | UC2871DWTR |
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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| UC2871DWTRG4 | 制造商:Texas Instruments 功能描述:FLUORESCENT LAMP DRVR 20V 18SOIC - Tape and Reel |
| UC2871N | 功能描述:顯示驅(qū)動(dòng)器和控制器 Resonant Fluorescent Lamp Driver RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| UC2871NG4 | 功能描述:顯示驅(qū)動(dòng)器和控制器 Resonant Fluorescent Lamp Driver RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| UC2871Q | 功能描述:顯示驅(qū)動(dòng)器和控制器 Resonant Fluorescent Lamp Driver RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| UC2871QG3 | 功能描述:顯示驅(qū)動(dòng)器和控制器 Resonant Fluorescent Lamp Driver RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
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