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UC1871-12 датащи(PDF) 5 Page - Texas Instruments |
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UC1871-12 датащи(HTML) 5 Page - Texas Instruments |
5 / 14 page 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 µA. 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 |
Аналогичный номер детали - UC1871-12 |
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Аналогичное описание - UC1871-12 |
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