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UCC25705DGKTR Datasheet(PDF) 8 Page - Texas Instruments |
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UCC25705DGKTR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 12 page UCC25705, UCC25706, UCC35705, UCC35706 HIGHSPEED VOLTAGE MODE PULSE WIDTH MODULATOR SLUS473A – NOVEMBER 1999 – REVISED MARCH 2001 8 www.ti.com FUNCTIONAL DESCRIPTION oscillator without duty cycle clamp (MODE = 0) In this mode, the timing capacitor is discharged through a low impedance directly to ground. The DISCH pin is externally grounded. A comparator connected to DISCH senses the ground connection and disables both the discharge current source and VFF current source. A resistor divider is now required to set VFF. 4 5 RC DISCH 3 VFF R T C T V IN Figure 3. Ocsillator Without Clamp (MODE = 0) In this mode, the on-time is approximately: T ON +T R T C T where T+ V FF V IN The off-time is: T OFF [ 75 ns The frequency is: f + 1 T R T C T ) 75 ns |
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