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L6920DTR датащи(PDF) 8 Page - STMicroelectronics |
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L6920DTR датащи(HTML) 8 Page - STMicroelectronics |
8 / 13 page L6920 8/13 Figure 12. Demoboard Circuit Table 6. R4, R5 should be selected in the range of 100k Ω - 10MΩ to minimize consumption and error due to current sunk by FB pin (few nA). 5.2 Output capacitor selection The output capacitor affects both efficiency and output ripple so its choice has to be considered with particular care. The capacitance value should be in the range of about 10 µF-100µF. An additional, smaller, low ESR capacitor can be in parallel for high frequency filtering. A typical value can be around 1 µF. If very high performances, in terms of efficiency and output voltage ripple, are required, a very low ESR capac- itor has to be chosen. Ceramic capacitors are the lowest ESR but they are very expensive. Other possibilities are low-ESR tantalum capacitors, available from KEMET, AVX and other sources. POSCAP capacitors from SANYO and polymeric capacitors from PANASONIC are also good. Below there is a list of some capacitors suppliers. The cap values and rated voltages are only a suggested pos- sibility Jumper Position Function J1 1-2 Device enabled 2-3 Device disabled J2 None Adjustable using R4 and R5 [not mounted] 1-2 3.3V output voltage 2-3 5V output voltage L1 10 µH +VBATT +VBATT VBATT F.B. VOUT 7 1 8 GND Panasonic ELL6RH100M Panasonic EEFCDJ470R Panasonic EEFCDJ470R C2 47 µF C3 N.C. C1 47 µF C4 100nF R1 N.C. R3 N.C. R2 N.C. not mounted components R4 N.C. R5 N.C. VOUT GND 1 2 3 3 2 J2 J1 1 LBO 3 SHDN 5 VREF GND 4 6 LBI 2 LBO SHDN L6920 D01IN1310 |
Аналогичный номер детали - L6920DTR |
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Аналогичное описание - L6920DTR |
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