поискавой системы для электроныых деталей |
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LM2852 датащи(PDF) 10 Page - National Semiconductor (TI) |
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LM2852 датащи(HTML) 10 Page - National Semiconductor (TI) |
10 / 14 page Applications Information (Continued) falls to a low voltage. During this time, the soft-start voltage is forced to track the output so that once the short is re- moved, the LM2852 can restart gracefully from whatever voltage the output reached during the short circuit event. The range of soft-start capacitors is therefore restricted to values 1nF to 50nF. COMPENSATION The LM2852 provides a highly integrated solution to power supply design. The compensation of the LM2852, which is type-three, is included on-chip. The benefit to integrated compensation is straightforward, simple power supply de- sign. Since the output filter capacitor and inductor values impact the compensation of the control loop, the range of L, C and C ESR values is restricted in order to ensure stability. OUTPUT FILTER VALUES Table 1 details the recommended inductor and capacitor ranges for the LM2852 that are suggested for various typical output voltages. Values slightly different than those recom- mended may be used, however the phase margin of the power supply may be degraded. TABLE 1. Output Filter Values Frequency Option V OUT (V) PVIN (V) L (µH) C (µF) C ESR (m Ω) Min Max Min Max Min Max LM2852Y (500kHz) 0.8 3.3 10 15 100 220 70 200 0.8 5.0 10 15 100 120 70 200 1.0 3.3 10 15 100 180 70 200 1.0 5.0 10 15 100 180 70 200 1.2 3.3 10 15 100 180 70 200 1.2 5.0 15 22 100 120 70 200 1.5 3.3 10 15 100 120 70 200 1.5 5.0 22 22 100 120 70 200 1.8 3.3 10 15 100 120 100 200 1.8 5.0 22 33 100 120 100 200 2.5 3.3 6.8 10 68 120 95 275 2.5 5.0 15 22 68 120 95 275 3.3 5.0 15 22 68 100 100 275 LM2852X (1500kHz) 0.8 3.3 110 The 1500kHz version is designed for ceramic output capacitors which typically have very low ESR (<10m Ω.) 0.8 5.0 1.0 3.3 1.0 5.0 1.2 3.3 1.2 5.0 1.5 3.3 1.5 5.0 1.8 3.3 1.8 5.0 2.5 3.3 2.5 5.0 3.3 5.0 www.national.com 10 |
Аналогичный номер детали - LM2852 |
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Аналогичное описание - LM2852 |
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