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UC2886 Arkusz danych(PDF) 5 Page - Texas Instruments |
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UC2886 Arkusz danych(HTML) 5 Page - Texas Instruments |
5 / 8 page 5 UC1886 UC2886 UC3886 OSCILLATOR The UC3886 oscillator is a saw tooth. The rising edge is governed by a current controlled by RT flowing into the capacitor CT. The falling edge of the sawtooth sets the dead time for the output. Selection of RT should be done first, based on desired maximum duty cycle. CT can then be chosen based on the desired frequency, FS, and the value of RT. The design equations are: D V RT mA MAX = • 1 20 40 . . () () F VmA RT V CT V RT mA OSC = •• •• • 20 40 20 18 4 0 .. . .. Configuring the Current Sense Amplifier The UC3886 Current Sense Amplifier is used to amplify a differential current sense signal across a low value current sense resistor, RSENSE. This amplifier must be set up as a differential amplifier as shown. The Current Sense Amplifier gain, GCSA, is given by the ratio of R2/R1. The output of the Current Sense Ampli- fier at the ISO pin is given by VV V R R ISO BUF SENSE =+ • 2 1 The Current Sense Amplifier gain, GCSA, must be pro- grammed to be greater than or equal to 5.0 (14dB), as this amplifier is not stable with gain below 5.0. The Cur- rent Sense Amplifier gain is limited on the high side by its Gain-Bandwidth product of 2.5MHz. Therefore GCSA must be programmed between GCSA_MIN = 5.0 and GCSA_MAX = 2.5MHz/FSWITCH APPLICATION INFORMATION Figure 1. Oscillator UDG-96022 0.88 0.90 0.92 0.94 0.96 0.98 1.00 0 20 40 60 80 100 120 R6 (kΩ) Figure 2. Programming Maximum Duty Cycle with RT 10 100 1000 0 20 40 60 80 100 RT (kΩ) 100pF 220pF 470pF 1nF Figure 3. Programming Switching Frequency with CT 0.000 0.100 0.200 0.300 0.400 0.500 0.600 100 300 500 700 900 1100 CT (pF) RT = 5k RT = 100k Figure 4. Deadtime vs. CT and RT |
Podobny numer części - UC2886 |
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Podobny opis - UC2886 |
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