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LTM8020V Datasheet(PDF) 10 Page - Linear Technology |
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LTM8020V Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTM8020 10 8020fb High Temperature Considerations The die temperature of the LTM8020 must be lower than the maximum rating of 125°C, so care should be taken in the layout of the circuit to ensure good heat sinking of the LTM8020. To estimate the junction temperature, ap- proximate the power dissipation within the LTM8020 by applying the typical efficiency stated in this datasheet to the desired output power, or, if you have an actual module, by taking a power measurement. Then calculate the inter- nal temperature rise of the LTM8020 above the surface of the printed circuit board by multiplying the module’s power dissipation by the thermal resistance. The actual thermal resistance of the LTM8020 to the printed circuit board depends upon the layout of the circuit board, but the thermal resistance given on page 2, which is based upon a 25cm2 4-layer FR4 PC board, and the Typical Performance Characteristics can be used a guide. Finally, be aware that at high ambient temperatures the internal Schottky diode will have significant leakage current increasing the quiescent current of the LTM8020. BIAS Pin Considerations The BIAS pin is used to provide drive power for the internal power switching stage and operate internal circuitry. For proper operation, it must be powered by at least 3V. If the output voltage is programmed to be 3V or higher, simply tie BIAS to VOUT. If VOUT is less than 3V, BIAS can be tied to VIN or some other voltage source. In all cases, ensure that the maximum voltage at the BIAS pin is both less than 25V and the sum of VIN and BIAS is less than 47V. If BIAS power is applied from a remote or noisy voltage source, it may be necessary to apply a decoupling capacitor locally to the LTM8020. APPLICATIONS INFORMATION Figure 4. A Well Chosen Input Network Prevents Input Voltage Overshoot and Ensures Reliable Operation When the LTM8020 is Connected to a Live Supply + LTM8020 2.2μF VIN 10V/DIV IIN 10A/DIV VIN 10V/DIV IIN 10A/DIV VIN 10V/DIV IIN 10A/DIV 10μs/DIV 10μs/DIV 10μs/DIV VIN CLOSING SWITCH SIMULATES HOT PLUG IIN (4a) (4b) (4c) LOW IMPEDANCE ENERGIZED 24V SUPPLY STRAY INDUCTANCE DUE TO 6 FEET (2 METERS) OF TWISTED PAIR + LTM8020 2.2μF 10μF 35V AI.EI. LTM8020 2.2μF 0.1μF 1Ω 8020 F04 |
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