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CS8481YDPR5 Folha de dados(PDF) 5 Page - ON Semiconductor |
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CS8481YDPR5 Folha de dados(HTML) 5 Page - ON Semiconductor |
5 / 6 page CS8481 http://onsemi.com 5 ENABLE The ENABLE function controls VOUT1. When ENABLE is high, VOUT1 is on. When ENABLE is low, VOUT1 is off. Calculating Power Dissipation in a Dual Output Linear Regulator The maximum power dissipation for a dual output regulator (Figure 3) is PD(max) + VIN(max) * VOUT1(min) IOUT1(max) ) VIN(max) * VOUT2(min) IOUT2(max) ) VIN(max)IQ (1) where: VIN(max) is the maximum input voltage, VOUT1(min) is the minimum output voltage from VOUT1, VOUT2(min) is the minimum output voltage from VOUT2, IOUT1(max) is the maximum output current, for the application, IOUT2(max) is the maximum output current, for the application, and IQ is the quiescent current the regulator consumes at both IOUT1(max) and IOUT2(max). Once the value of PD(max) is known, the maximum permissible value of RqJA can be calculated: R QJA + 150 °C * TA PD (2) The value of RqJA can 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. Figure 3. Dual Output Regulator With Key Performance Parameters Labeled. SMART REGULATOR Control Features VOUT1 IOUT1 VOUT2 IOUT2 VIN IIN IQ Heat Sinks 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: R QJA + RQJC ) RQCS ) RQSA (3) where: RqJC = the junction−to−case thermal resistance, RqCS = the case−to−heatsink thermal resistance, and RqSA = the heatsink−to−ambient 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 interface between them. These values appear in heat sink data sheets of heat sink manufacturers. Figure 4. Test and Application Circuit * C1 required if regulator is located far from power supply filter. ** C2 and C3 required for stability. Capacitor must operate at minimum temperature expected during system operations. ENABLE VOUT2 VIN VOUT1 CS8481 GND Load VBATT VCC I/O GND mP C3** C1* C2** 0.1 mF 22 mF ESR < 8 W 22 mF ESR < 8 W |
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Descrição semelhante - CS8481YDPR5 |
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