Datenblatt-Suchmaschine für elektronische Bauteile |
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UC2854N Datenblatt(PDF) 6 Page - Texas Instruments |
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UC2854N Datenblatt(HTML) 6 Page - Texas Instruments |
6 / 13 page TYPICAL CHARACTERISTICS at TA = TJ = 25 oC (cont.) UC1854 UC2854 UC3854 IAC, µA Mult Out µA 0 100 200 300 400 500 600 0 100 200 300 400 500 VRMS=1.5V VA Out=1.25V VA Out=2.5V VA Out=3.5V IAC, µA Mult Out µA 0 50 100 150 200 250 0 100 200 300 400 500 VRMS=3V VA Out=1.25V VA Out=2V VA Out=3V VA Out=5V IAC, µA Mult Out, µA 0 20 40 60 80 100 120 140 0 100 200 300 400 500 VRMS=5V VA Out=5V VA Out=1.5V VA Out=3V IAC, µA Mult Out µA 0 20 40 60 80 100 120 140 160 0 100 200 300 400 500 VRMS=4V VA Out=1.25V VA Out=2V VA Out=3V VA Out=4V VA Out=5V Multiplier Output vs Multiplier Inputs with Mult Out=0V APPLICATIONS INFORMATION A 250W PREREGULATOR The circuit of Figure 1 shows a typical application of the UC3854 as a preregulator with high power factor and effi- ciency. The assembly consists of two distinct parts, the control circuit centering on the UC3854 and the power section. The power section is a "boost" converter, with the induc- tor operating in the continuous mode. In this mode, the duty cycle is dependent on the ratio between input and output voltages; also, the input current has low switching frequency ripple, which means that the line noise is low. Furthermore, the output voltage must be higher than the peak value of the highest expected AC line voltage, and all components must be rated accordingly. In the control section, the UC3854 provides PWM pulses (GT Drv, Pin 16) to the power MOSFET gate. The duty cycle of this output is simultaneously controlled by four separate inputs to the chip: INPUT PIN # FUNCTION VSENSE........................ 11 .......... Output DC Voltage IAC.................................6 .......... LineVoltage Waveform ISENSE/Mult Out .........4/5 .......... Line Current VRMS .............................8 .......... RMS Line Voltage Additional controls of an auxiliary nature are provided. They are intended to protect the switching power MOS- FETS from certain transient conditions, as follows: INPUT PIN # FUNCTION ENA ............................10 .......... Start-Up Delay SS ...............................13 .......... Soft Start PKLIM ...........................2 .......... Maximum Current Limit 6 |
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