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TL1454CD Arkusz danych(PDF) 5 Page - Texas Instruments |
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TL1454CD Arkusz danych(HTML) 5 Page - Texas Instruments |
5 / 24 page TL1454, TL1454Y DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM) CONTROL CIRCUIT SLVS086B – APRIL 1995 – REVISED NOVEMBER 1997 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 error amplifier R1 and R2 should be tight-tolerance ( ±1% or better) devices with low and/or matched temperature coefficients to minimize output voltage errors. A device with a ±5% tolerance is suitable for R3. _ + IN – IN + R2 COMP To PWM VO Compensation Network REF R1 R3 Converter Output Figure 2. Sense Divider/Error Amplifier Configuration for Converters with Negative Outputs Figure 2 shows the divider network and error-amplifier configuration for negative output voltages. In general, the comments for positive output voltages also apply for negative outputs. The output voltage is given by: V O +* R 1 V ref R 2 The design procedure for choosing the resistor value is to select a convenient value for R2 (instead of R3 in the procedure for positive outputs) and calculate R1 and R3 using: R 1 +* R 2 V O V ref R 3 + R 1 R 2 R 1 ) R 2 Values in the 10-k Ω to 20-kΩ range work well for R2. R3 can be omitted and the noninverting amplifier connected to ground in applications where the output voltage tolerance is not critical. oscillator The oscillator frequency can be set between 50 kHz and 2 MHz with a resistor connected between RT and GND and a capacitor between CT and GND (see Figure 3). Figure 6 is used to determine RT and CT for the desired operating frequency. Both components should be tight-tolerance, temperature-stable devices to minimize frequency deviation. A 1% metal-film resistor is recommended for RT, and a 10%, or better, NPO ceramic capacitor is recommended for CT. RT CT RT CT TL1454 21 Figure 3. Oscillator Timing |
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