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LT1611 数据表(PDF) 10 Page - Linear Technology |
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LT1611 数据表(HTML) 10 Page - Linear Technology |
10 / 12 page LT1964 10 1964f Figure 2. Ceramic Capacitor DC Bias Characteristics Thermal Considerations The power handling capability of the device will be limited by the maximum rated junction temperature (125 °C). The power dissipated by the device will be made up of two components: 1. Output current multiplied by the input/output voltage differential: IOUT • (VIN – VOUT), and 2. Ground pin current multiplied by the input voltage: IGND • VIN. The GND pin current can be found by examining the GND Pin Current curves in the Typical Performance Character- istics. Power dissipation will be equal to the sum of the two components listed above. The LT1964 series regulators have internal thermal limit- ing designed to protect the device during overload condi- tions. For continuous normal conditions the maximum junction temperature rating of 125 °C must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambient. Additional heat sources mounted nearby must also be considered. For surface mount devices, heat sinking is accomplished by using the heat spreading capabilities of the PC board and its copper traces. Copper board stiffeners and plated through-holes can also be used to spread the heat gener- ated by power devices. The following table lists thermal resistance for several different board sizes and copper areas. All measurements were taken in still air on 3/32" FR-4 board with one ounce copper. Table 1. Measured Thermal Resistance COPPER AREA THERMAL RESISTANCE TOPSIDE* BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT) 2500mm2 2500mm2 2500mm2 125 °C/W 1000mm2 2500mm2 2500mm2 125 °C/W 225mm2 2500mm2 2500mm2 130 °C/W 100mm2 2500mm2 2500mm2 135 °C/W 50mm2 2500mm2 2500mm2 150 °C/W *Device is mounted on topside. The thermal resistance junction-to-case (θJC), measured at Pin 2, is 60 °C/W. DC BIAS VOLTAGE (V) 1964 F02 20 0 –20 –40 –60 –80 –100 0 4 8 10 26 12 14 X5R Y5V 16 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10 µF TEMPERATURE ( °C) –50 40 20 0 –20 –40 –60 –80 –100 25 75 1964 F03 –25 0 50 100 125 Y5V X5R BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10 µF APPLICATIO S I FOR ATIO Figure 3. Ceramic Capacitor Temperature Characteristics Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor LT1964-5 COUT = 10µF CBYP = 0.01µF ILOAD = –200mA VOUT 1mV/DIV 100ms/DIV 1964 F04 |
类似零件编号 - LT1611 |
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类似说明 - LT1611 |
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