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UC1872 Datasheet(PDF) 5 Page - Texas Instruments |
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UC1872 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 11 page 5 UC1872 UC2872 UC3872 Figure 1. Typical application. UDG-93018-2 A unique protection feature incorporated in the UC3872 is the Open Lamp Detect circuit. An open lamp interrupts the current feedback loop and causes very high second- ary 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 amplifier’s 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 a battery. During shut- down, the IC typically draws less than 1 µA. The UC3872, operating from 4.5V to 24V, is compatible with almost all battery voltages used in portable computers and auto- motive applications. Undervoltage lockout circuitry dis- ables operation until sufficient supply voltage is available, and a 1% voltage reference insures accurate operation. APPLICATION INFORMATION (cont.) |
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Descripción similar - UC1872_09 |
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