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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4007 датащи(PDF) 9 Page - STMicroelectronics |
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AN4007 датащи(HTML) 9 Page - STMicroelectronics |
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9 / 33 page  AN4007 Test board: design and evaluation Doc ID 022455 Rev 2 9/33 Figure 5. Efficiency vs. output power 1.3 No-load consumption The input power of the converter was measured in no load condition, with brownout protection disabled (see relevant Section 2.4: Brownout protection) and brownout protection enabled in the entire input voltage range. The converter in the no load condition works always in burst mode so that the average switching frequency is reduced. The presence of the brownout resistor divider (R16, R17 and R18, see schematic in Figure 2) does not affect the average switching frequency but increases the input power consumption due to the power dissipated across it. It is worth noting that often, if the converter is used as the standby power supply for LCD TVs, PDPs or other applications, the EMI line filter often coincides with the main power supply line filter that heavily contributes to standby consumption even if the power needed by the auxiliary power supply is very low. Table 5. Efficiency at 230 VAC Load IOUT VOUT POUT PIN Efficiency 25% 0.75 4.97 3.73 4.9 76.07% 50% 1.5 4.965 7.45 9.61 77.50% 75% 2.25 4.965 11.17 14.45 77.31% 100% 3 4.95 14.85 19.3 76.94% Average efficiency 76.96% 02 46 8 10 12 14 16 72 73 74 75 76 77 78 79 115 Vac 230 Vac average @115 Vac averege @230 Vac Output power [W] CoC & DoE limits AM11344v1 |
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