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SS6577COTB 数据表(PDF) 11 Page - Silicon Standard Corp. |
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SS6577COTB 数据表(HTML) 11 Page - Silicon Standard Corp. |
11 / 14 page www.SiliconStandard.com 11 of 14 SS6577 Rev.1.02 3/26/2004 return to its designed value when the peak inductor value no longer exceeds over current protection point. Over Voltage Protection Over voltage protection occurs when the FB pin voltage (the negative input of error amplifier) ex- ceeds 0.855V. The over voltage comparator will force driver to pull low until output over voltage is removed. PCB Layout Since operating at a high switching frequency, 500KHz, proper PCB layout and component place- ment may enhance the performance of the SS6577 application circuit. For a better efficiency, major loop from input terminal to output terminal should be as short as possible. In addition, in the case of a large current loop, the track width of each component in the loop should maintain as wide as possible. In order to prevent the effect from noise, the GND pin should be placed close to the ground. Also keep the IC’s GND pin and the ground leads in the short- est distance. Recommended layout diagrams and component placement are as shown as figures 13 to 16. No sensitive components, which may cause noise interference to the circuit, should be allowed to be close to SW pin. Furthermore, the SS6577 is a current-mode controller. Keeping the sense resistor close to both VIN and CS pins is recommended for better efficiency and output performance. In addition, all filtering and de- coupling capacitors, such as C1 and C2, should connect to the SS6577 as close as possible. Fig. 12 Top Layer Fig. 13 Bottom Layer |
类似零件编号 - SS6577COTB |
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类似说明 - SS6577COTB |
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