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UC1861Q Datasheet(PDF) 7 Page - Texas Instruments |
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UC1861Q Datasheet(HTML) 7 Page - Texas Instruments |
7 / 9 page 7 UC1861-1868 UC2861-2868 UC3861-3868 Minimum oscillator frequency is set by Rmin and Cvco. The minimum frequency is approximately given by the equation: F RC MIN MIN VCO ≅ 43 . • Maximum oscillator frequency is set by Rmin, Range & Cvco. The maximum frequency is approximately given by the equation: F R Range C MAX MIN VCO ≅ 33 . (/ / ) • The Error Amplifier directly controls the oscillator fre- quency. E/A output low corresponds to minimum fre- quency and output high corresponds to maximum frequency. At the end of each oscillator cycle, the RC pin is discharged to one diode drop above ground. At the be- ginning of the oscillator cycle, V(RC) is less than Vth1 and so the output of the zero detect comparator is ig- nored. After V(RC) exceeds Vth1, the one shot pulse will be terminated as soon as the zero pin falls below 0.5V or V(RC) exceeds Vth2. The minimum one shot pulse width is approximately given by the equation: Tpw(min) 0.3 R C. The maximum pulse width is approximately given by: Tpw(max) 1.2 RC. APPLICATION INFORMATION The steering logic is configured on the UC1861,63 to result in dual non-overlapping square waves at outputs A & B. This is suited to drive dual switch ZVS systems. STEERING LOGIC UDG-92013 The steering logic is configured on the UC1862,64 to result in inverted pulse trains occurring identically at both output pins. This is suited to drive single switch ZVS systems. Both outputs are available to drive the same MOSFET gate. It is advisable to join the pins with 0.5 ohm resistors. UDG-92014 The steering logic is configured on the UC1865,67 to result in alternating pulse trains at outputs A & B. This is suited to drive dual switch ZCS systems. UDG-92015 The steering logic is configured on the UC1866,68 to result in non-inverted pulse trains occurring identically at both output pins. This is suited to drive single switch ZCS systems. Both outputs are available to drive the same MOSFET gate. It is ad- visable to join the pins with 0.5 ohm resistors. UDG-92016 |
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