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UC2860 Fiches technique(PDF) 4 Page - Texas Instruments |
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UC2860 Fiches technique(HTML) 4 Page - Texas Instruments |
4 / 10 page UC1860 UC2860 UC3860 ERROR AMPLIFIER The error amplifier is a high gain, low offset, high bandwidth de- sign with precise limits on its output swing. The bandwidth of the amplifier is externally determined by the resistance seen at the inverting input. Unity gain bandwidth is approximately: Frequency (0dB) = 1/(2 π * RIN (-) * CCOMP) The input common mode range of the amplifier is from 2.8 to 4.5V. As long as one pin is within this range, the other can go as low as zero. The output swing with respect to the lVFO pin is limited from zero to 2V. Note that pulling Sft Strt (soft start) low will lower the ref- erence of the upper clamp. The lower clamp, however, will dominate should the upper clamp reference drop below the lower reference. UNDER VOLTAGE LOCKOUT SECTION The under voltage lockout consists of three comparators that monitor VCC, UVLO and VREF. The VREF comparator makes sure that the reference voltage is sufficiently high before op- eration begins. When the UVLO comparator is low, the outputs are driven low, the fault latch is reset, the soft start pin is dis- charged, and the toggle flip-flop is loaded for output A. The VCC comparator is used for off-line applications by leaving the UVLO pin open. In this application the supply current is typically less than 0.3mA during start-up. The UVLO comparator is used for DC to DC applications or to gate the chip on and off. To utilize its hysteretic threshold by an external resistive divider, the internal impedance of the pin must be accounted for. To run from a 5V external supply, UVLO, VCC, and VREF are tied together. ICC vs VCC 4 |
Numéro de pièce similaire - UC2860 |
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Description similaire - UC2860 |
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