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CS8120YTVA5 Fiches technique(PDF) 7 Page - Cherry Semiconductor Corporation |
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CS8120YTVA5 Fiches technique(HTML) 7 Page - Cherry Semiconductor Corporation |
7 / 8 page 7 The maximum power dissipation for a single output regu- lator (Figure 7) is: PD(max)={VIN(max) Ð VOUT(min)}IOUT(max) + VIN(max)IQ (1) where: VIN(max) is the maximum input voltage, VOUT(min) is the minimum output voltage, IOUT(max) is the maximum output current for the applica- tion, and IQ is the quiescent current the regulator consumes at IOUT(max). Once the value of PD(max) is known, the maximum permis- sible value of RQJA can be calculated: RQJA = (2) The value of RQJA can then be compared with those in the package section of the data sheet. Those packages with RQJA's less than the calculated value in equation 2 will keep the die temperature below 150¡C. In some cases, none of the packages will be sufficient to dissipate the heat generated by the IC, and an external heatsink will be required. A heat sink effectively increases the surface area of the package to improve the flow of heat away from the IC and into the surrounding air. Each material in the heat flow path between the IC and the outside environment will have a thermal resistance. Like series electrical resistances, these resistances are summed to determine the value of RQJA: RQJA = RQJC + RQCS + RQSA (3) where: RQJC = the junctionÐtoÐcase thermal resistance, RQCS = the caseÐtoÐheatsink thermal resistance, and RQSA = the heatsinkÐtoÐambient thermal resistance. RQJC appears in the package section of the data sheet. Like RQJA, it too is a function of package type. RQCS and RQSA are functions of the package type, heatsink and the inter- face between them. These values appear in heat sink data sheets of heat sink manufacturers. 150¡C - T A PD Calculating Power Dissipation in a Single Output Linear Regulator Application Notes: continued Heat Sinks VIN Smart Regulator VOUT IOUT IIN IQ Control Features } Figure 7. Single output regulator with key performance parameters labeled. RESET VOUT RRST C2** 10 mF CRST ENABLE VIN C1* 0.1 mF to mP RESET Port 5V to mP and System Power CS-8120 Figure 6. Circuit showing output compensation capacitor. *C1 is required if regulator is far from power source filter. **C2 is required for stability. |
Numéro de pièce similaire - CS8120YTVA5 |
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Description similaire - CS8120YTVA5 |
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