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LT3570 データシート(PDF) 15 Page - Linear Technology |
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LT3570 データシート(HTML) 15 Page - Linear Technology |
15 / 20 page LT3570 15 3570fb APPLICATIONS INFORMATION compensation resistor, RC, is usually in the range of 5k to 50k. A good technique to compensate a new application is to use a 50k potentiometer in place of RC, and use a 1nF capacitor for CC. By adjusting the potentiometer while observing the transient response, the optimum value for RC can be found. Figures 3a to 3c illustrate this process for the circuit of Figure 1 with load current stepped from 100mA to 500mA for the buck converter. Figure 3a shows the transient response with RC equal to 1.6k. The phase margin is poor as evidenced by the excessive ringing in the output voltage and inductor current. In Figure 3b, the value of RC is increased to 5.75k, which results in a more damped response. Figure 3c shows the result when RC is increased further to 25k. The transient response is nicely damped and the compensation procedure is complete. The same procedure is used to compensate the boost converter. Soft-Start The soft-start time is programmed with an external capaci- tor to ground on SS. An internal current source charges it with a nominal 4.5μA. The voltage on the soft-start pin is used to control the feedback voltage. The soft-start time is determined by the equation: tSS = 0.2 • CSS where CSS is in nF and tSS is in ms. In the event of a commanded shutdown, ULVO on the input or a thermal shutdown, the capacitor is discharged automatically. The soft-start will remain low and only charge back up after the fault goes away and the voltage on SS is less than approximately 100mV. Figure 3a. Transient Response Shows Excessive Ringing Figure 3b. Transient Response is Better Figure 3c. Transient Response Well Damped IOUT 500mA/DIV VOUT 200μs/DIV 3570 F03a IOUT 500mA/DIV VOUT 200μs/DIV 3570 F03b IOUT 500mA/DIV VOUT 200μs/DIV 3570 F03c |
同様の部品番号 - LT3570_15 |
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同様の説明 - LT3570_15 |
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