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LM2575 データシート(PDF) 7 Page - Texas Instruments |
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LM2575 データシート(HTML) 7 Page - Texas Instruments |
7 / 10 page www.ti.com Output Voltage Ripple and Transients Feedback Connection ON/OFF Input Grounding LM2575 1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR SLVS569E – JANUARY 2005 – REVISED JANUARY 2006 APPLICATION INFORMATION (continued) As with any switching power supply, the output of the LM2575 has a sawtooth-ripple voltage at the switching frequency. Typically about 1% of the output voltage, this ripple is due mainly to the inductor sawtooth-ripple current and the ESR of the output capacitor (see note on COUT). Furthermore, the output also may contain small voltage spikes at the peaks of the sawtooth waveform. This is due to the fast switching of the output switch and the parasitic inductance of COUT. These voltage spikes can be minimized through the use of low-inductance capacitors. There are several ways to reduce the output ripple voltage: a larger inductor, a larger COUT, or both. Another method is to use a small LC filter (20 µH and 100 µF) at the output. This filter can reduce the output ripple voltage by a factor of 10 (see Figure 1). FEEDBACK must be connected between the two programming resistors. Again, both of these resistors should be in close proximity to the regulator, and each should be less than 100 k Ω to minimize noise pickup. ON/OFF should be grounded or be a low-level TTL voltage (typically <1.6 V) for normal operation. To shut down the LM2575 and put it in standby mode, a high-level TTL or CMOS voltage should be supplied to this pin. ON/OFF should not be left open and safely can be pulled up to VIN with or without a pullup resistor. The power and ground connections of the LM2575 must be low impedance to help maintain output stability. With the 16-pin package, all the ground pins (including signal and power grounds) should be soldered directly to wide PCB copper traces to ensure low-inductance connections and good thermal dissipation. 7 |
同様の部品番号 - LM2575_06 |
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同様の説明 - LM2575_06 |
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