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UC2838AQ Arkusz danych(PDF) 4 Page - Texas Instruments |
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UC2838AQ Arkusz danych(HTML) 4 Page - Texas Instruments |
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4 / 12 page  UC2838, UC2838A UC3838, UC3838A SLUS221A – APRIL 2000 – REVISED MAY 2001 4 www.ti.com typical application NOTE: 12 V, 4 A output with switching frequency = 50 kHz. + + 3 2 6 7 4.7 k Ω 0.47 8 16 15 k Ω 0.1 1 15 20 Ω 14 11 10 REF 9 4, 5, 12, 13 2.5 V 300 Ω 1 W UES1003 UES2403 UES2403 100 Ω 0.02 Ω 100 Ω 9.1 k Ω 1000 3.6 k Ω 12 k Ω 2 k Ω 2.4 k Ω + GND +V O 100 µH UC3838/A 15 V AUXILLIARY SUPPLY 12 V SECONDARY WINDING MAGNETIC AMPLIFIER 45 TURNS 50B10–1D CORE APPLICATION INFORMATION Figure 1. 0.1 10 1 k 10 k 1 M 0 20 40 60 80 100 120 Signal Frequency – Hz 360 315 270 225 180 1.0 100 0.1 M Phase Gain VO VIN + VIN 2.5 V VO Gain = 20 Log 140 GAIN MAGNITUDE/PHASE vs SIGNAL FREQUENCY Figure 2. –0.2 –0.4 –0.8 –1.0 –1.2 –20 –40 –60 Input Current – mA –80 –100 0 –0.6 –1.4 0 –120 T J= 25 C T J= –55 C T J= 125 C GAIN MAGNITUDE vs SIGNAL FREQUENCY |
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