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UC1841L883B Scheda tecnica(PDF) 6 Page - Texas Instruments |
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UC1841L883B Scheda tecnica(HTML) 6 Page - Texas Instruments |
6 / 11 page FLYBACK APPLICATION (A) In this application (see Figure A, next page), complete control is maintained on the primary side. Control power is provided by RIN and CIN during start-up, and by a pri- mary-referenced low voltage winding, N2, for efficient op- eration after start. The error amplifier loop is closed to regulate the DC voltage from N2 with other outputs fol- lowing through their magnetic coupling − a task made even easier with the UC1841’s feed −forward line regula- tion. An extension to this application for more precise regula- tion would be the use of the UC1901 Isolated Feedback Generator for direct closed-loop control to an output. Not shown, are protective snubbers or additional interface circuitry which may be required by the choice of the high- voltage switch, Qs, or the application; however, one ex- ample of power transistor interfacing is provided on the following page. REGULATOR APPLICATION (B) With the addition of a level shifting transistor, Q1, the UC1841 is an ideal control circuit for DC to DC converters such as the buck regulator shown in Figure B opposite. In addition to providing constant current drive pulses to the PIC661 power switch, this circuit has full fault protection and high speed dynamic line regulation due to its feed- forward capability. An additional feature is the ability to UC1841 UC2841 UC3841 OPEN-LOOP TEST CIRCUIT Nominal Frequency = 1 RT CT = 50 kHz Start Voltage = 3 R1 + R2 + R3 R2 + R3 +0.2R1 = 12V UV Fault Voltage = 3 R1 + R2 + R3 R2 + R3 = 8V OV Fault Voltage = 3 R1 + R2 + R3 R3 = 32V Current Limit = 200mV Current Fault Voltage = 600mV Duty Cycle Clamp = 50% 6 |
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