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UC2860DW Fiches technique(PDF) 5 Page - Texas Instruments

No de pièce UC2860DW
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

UC2860DW Fiches technique(HTML) 5 Page - Texas Instruments

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UC1860
UC2860
UC3860
VARIABLE FREQUENCY OSCILLATOR
The VFO block is controlled through 4 pins: CVFO, lVFO,
Osc Dsbl (oscillator disable), and Trig (trigger input). Os-
cillator frequency is approximately:
Frequency = IVFO/(CVFO * 1V)
With a fixed capacitor and low voltage applied to Trig and
Osc Dsbl, frequency is linearly modulated by varying the
current into the lVFO pin.
The Trig and Osc Dsbl inputs are used to modify VFO op-
eration. If Osc Dsbl is held high, the oscillator will com-
plete the current cycle but wait until Osc Dsbl is returned
low to initiate a new cycle. If a pulse is applied to Trig dur-
ing a cycle, the oscillator will immediately initiate a new
cycle. Osc Dsbl has priority over Trig, but if a trigger pulse
is received while Osc Dsbl is high, the VFO will remember
the trigger pulse and start a new cycle as soon as Osc
Dsbl goes low.
Normally low trigger pulses are used to synchronize the
oscillator to a faster clock. Normally high trigger pulses
can also be used to synchronize to a slower clock.
ONE SHOT TIMER
The one shot timer performs three functions and is pro-
grammed by the RC pin. The first function is to control
output driver pulse width. Secondly, it clocks the toggle
flip-flop. Thirdly, it establishes the maximum allowable fre-
quency for the VFO. One shot operation is initiated at the
beginning of each oscillator cycle. The RC pin, pro-
grammed by an external resistor and capacitor to ground,
is charged to approximately 4.3V and then allowed to dis-
charge. The lower threshold is approximately 80% of the
peak. On time is approximately:
t(on) = 0.2 * R * C.
After crossing the lower threshold, the resistor continues
to discharge the capacitor to approximately 3V, where it
waits for the next oscillator cycle.
Maximum Frequency vs R
On Time vs R
VFO Frequency vs IVFO
5


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