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ILC7082AIM550X датащи(PDF) 7 Page - Fairchild Semiconductor |
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ILC7082AIM550X датащи(HTML) 7 Page - Fairchild Semiconductor |
7 / 16 page ILC7082 REV. 1.6.2 11/17/04 7 Note that there is a parasitic diode from the LDO regulator output to the input. If the input voltage swings below the regulator’s output voltage by 200mV then the regulator may be damaged. This condition must be avoided. In many appli- cations a large value input capacitor, CIN, will hold VIN higher than VOUT and decay slower than VOUT when the LDO is powered off. Output Capacitor Selection Fairchild strongly recommends the use of low ESR (equiva- lent series resistance) ceramic capacitors for COUT and CNOISE The ILC7082 is stable with low ESR capacitor (as low as zero Ω). The value of the output capacitor should be 1µF or higher. Either a ceramic chip or a tantalum capacitor may be used at the output. Use of ceramic chip capacitors offer significant advantages over tantalum capacitors. A ceramic capacitor is typically cheaper than a tantalum capacitor, it usually has a smaller footprint, lower height, and lighter weight than a tantalum capacitor. Furthermore, unlike tantalum capacitors which are polarized and can be damaged if connected incorrectly, ceramic capacitors are non-polarized. Low value ceramic chip capacitors with X5R or X7R dielectric are available in the 100pF to 4.7µF range. Beware of using ceramic capaci- tors with Y5V dielectric since their ESR increases signifi- cantly at cold temperatures. Table 1 shows a list of recommended ceramic capacitors for use at the output of ILC7082. Note: If a tantalum output capacitor is used then for stable operation we recommend a low ESR tantalum capacitor with maximum rated ESR at or below 0.4 Ω. Low ESR tantalum capacitors, such as the TPS series from AVX Corporation (www.avxcorp.com) or the T495 series from Kemet (www.kemet.com) may be used. In applications where a high output surge current can be expected, use a high value but low ESR output capacitor for superior load transient response. The ILC7082 is stable with no load. Noise Bypass Capacitor In low noise applications, the ILC7082’s noise can be decreased further by connecting a capacitor from the noise bypass pin to ground. The noise bypass pin is a high impedance node, and as such, care should be taken in printed circuit board layout to avoid noise pick-up from external sources. Moreover, the noise bypass capacitor should have low leakage. Noise bypass capacitors with a value as low as 470pF may be used. However, for optimum performance, use a 0.01µF or larger, ceramic chip capacitor. Note that the turn on and turn off response of the ILC7082 is inversely proportional to the value of the noise bypass capacitor. For fast turn on and turn off, use a small value noise bypass capacitor. In appli- cations were exceptionally low output noise is not required, consider omitting the noise bypass capacitor altogether. The Effects of ESR (Equivalent Series Resistance) The ESR of a capacitor is a measure of the resistance due to the leads and the internal connections of the component. Typically measured in m Ω (milli-ohms) it can increase to ohms in some cases. Wherever there is a combination of resistance and current, voltages will be present. The control functions of LDOs use two voltages in order to maintain the output precisely; VOUT and VREF. Table 1. Recommended Ceramic Output Capacitors COUT Capacitor Size IOUT Dielectric Part Number Capacitor Vendor 1 µF 0805 0 to 150mA X5R C2012X5R1A105KT TDK 0805 X7R GRM40X7R105K010 muRata 0805 X7R LMK212BJ105KG Taiyo-Yuden 1206 X7R GRM42-6X7R105K016 muRata 1206 X7R EMK316BJ105KL Taiyo-Yuden 1206 X5R TMK316BJ105KL Taiyo-Yuden 2.2 µF 0805 0 to 150mA X5R GRM40X5R225K 6.3 muRata 0805 X5R C2012X5R0J225KT TDK 1206 X5R EMK316BJ225ML Taiyo-Yuden 4.7 µF 1206 0 to 150mA X5R GRM42-6X5R475K010 muRata 1206 X7R LMK316BJ475ML Taiyo-Yuden |
Аналогичный номер детали - ILC7082AIM550X |
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Аналогичное описание - ILC7082AIM550X |
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