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UC2860DWTR Fiches technique(PDF) 4 Page - Texas Instruments

No de pièce UC2860DWTR
Description  Resonant Mode Power Supply Controller
Download  10 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2860DWTR Fiches technique(HTML) 4 Page - Texas Instruments

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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


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