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TL3845D Scheda tecnica(PDF) 10 Page - Texas Instruments |
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TL3845D Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 12 page TL284x, TL384x CURRENT-MODE PWM CONTROLLERS SLVS038E – JANUARY 1989 – REVISED DECEMBER 1999 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION DEAD TIME vs TIMING CAPACITANCE Figure 4 100 40 10 4 0 CT – Timing Capacitance – nF 100 40 10 4 1 0.4 0.1 VCC = 15 V RT ≥ 5 kΩ TA = 25°C TIMING RESISTANCE vs FREQUENCY Figure 5 100 1 k 10 k 100 k 1 M f - Frequency - Hz 100 40 10 4 1 VCC = 15 V TA = 25°C CT = 22 nF CT = 47 nF CT = 100 nF CT = 10 nF CT = 4.7 nF CT = 22 nF CT = 1 nF open-loop laboratory test fixture In the open-loop laboratory test fixture shown in Figure 6, high peak currents associated with loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to the GND terminal in a single-point ground. The transistor and 5-k Ω potentiometer sample the oscillator waveform and apply an adjustable ramp to the ISENSE terminal. 2N2222 4.7 k Ω 1 k Ω Error Amplifier Adjust 4.7 k Ω 5 k Ω ISENSE Adjust RT 100 k Ω COMP VFB ISENSE RT/CT REF OUTPUT GND VCC 0.1 µF 0.1 µF REF VCC OUTPUT GND 1 k Ω, 1 W A CT TL284x TL384x DUT Figure 6. Open-Loop Laboratory Test Fixture |
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