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UC2856-Q1 Datasheet(PDF) 6 Page - Texas Instruments |
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UC2856-Q1 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 16 page VREF 9 COMP S0019-01 CT 8 RT 8 mA 10 SYNC SAWTOOTH CT OSC SYNC Output Deadtime (td) NOTE: Output deadtime is determined by the size of the external capacitor, CT, according to the formula: For large values of RT: Oscillator frequency is approximated by the formula: Td + 2C T 8 mA * 3.6 R T ƒ T + 2 R T C T Td + 250 CT VREF 6 S0020-01 0.5 mA − 5 + Zs Zf lf < 0.5 mA VREF 7 COMP −20 −10 0 10 20 30 40 50 60 70 80 90 0 −180 −90 G001 f − Frequency − Hz VIN = 20 V TJ = 25° 10M 1k 10k 100 100k 1M UC2856-Q1 SLVS863B – JUNE 2008 – REVISED MAY 2011 www.ti.com APPLICATION AND OPERATION INFORMATION Figure 1. Oscillator Circuit NOTE: Error Amplifier can source up to 0.5 mA. Figure 2. Error Amplifier Output Configuration Figure 3. Error Amplifier Gain and Phase vs Frequency 6 Copyright © 2008–2011, Texas Instruments Incorporated |
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