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TS1583CZ533 bảng dữ liệu(PDF) 6 Page - Taiwan Semiconductor Company, Ltd |
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TS1583CZ533 bảng dữ liệu(HTML) 6 Page - Taiwan Semiconductor Company, Ltd |
6 / 7 page TS1583 series 6-6 2003/12 rev. A Application Information (continued) Protection Diodes In normal operation TS1583 family does not need any protection diodes between the Adjust pin and the output and from the output to the input to prevent die overstress. Internal resistors are limiting the internal current paths on the Adjust pin. Therefore even with bypass capacitors on the Adjust pin no protection diode is needed to ensure device safety under short-circuit conditions. The Adjust pin can be driver on a transient basis +/-7V with respect to the output without any device degradation. A protection diode between the Output pin and Vpower pin is not usually needed. Microsecond surge currents of 15A to 25A can be handled by the internal diode between the Output pin and Vpower pin of the device. In normal operations it is difficult to get those values of surge currents even with the use of large output capacitances. Only with high value output capacitors, such as 1000uF to 5000uF and the Vpower pin is instantaneously shorted to ground, damage can occur. A diode from output to input is recommended. Figure 6. Optional Clamp Diodes Protect Against Input Crowbar Circuits If TS1583 is connected as a single supply device with the control and power input ins shorted together the internal diode between the output and the power input pin will protect the control input pin. Thermal Considerations The TS1583 family have internal power and thermal limiting circuit designed to protect the device under overload conditions. However maximum junction temperature ratings should not be exceeded under continuous normal load conditions. Careful consideration must be given to all sources of thermal resistance from junction to ambient, including junction-to-case, case-to-heat sink interface and heat sink resistance itself. Junction temperature of the Control section can urn up to125 oC. Junction temperature of the Power section can run up to 150 oC. Due to the thermal gradients between the power transistor and the control circuitry there is a significant difference in thermal resistance between the Control and Power sections. Virtually all the power dissipated by the device is dissipated in the power transistor. The temperature rise in the power transistor will be greater than the temperature rise in the Control section making the thermal resistance lower in the Control section. At power levels below 12W the temperature gradient will be less than 25 oC and the maximum ambient temperature will be determined by the junction temperature of the Control section. This is due to the lower maximum junction temperature in the Control section. At power levels above 12W the temperature gradient will be greater than 25 oC and the maximum ambient temperature will be determined by the Power section. In both cases the junction temperature is determined by the total power dissipated in the device. For most low dropout applications the power dissipation will be less than 12W. The power in the device is made up of two components: the power in the output transistor and the power in the control circuit. The power in the control circuit is negligible. The power in the control circuit is equal to: Pcontrol = ( Vcontrol – Vout ) ( Icontrol ) Where Icontrol is equal Iout / 100 (typ) The power in the out transistor is equal to: Poutput = ( Vpower – Vout ) ( Iout ) The total power is equal to: Ptotal = Pcontrol + Poutput Junction-to-case thermal resistances is specified from the IC junction to the bottom of the case directly below the die. This is the lowest resistance path for the heat flow. In order to ensure the best possible thermal flow this area of the package to the heat sink proper mounting is required. Thermal compound at the case-to-heat sink interface is recommended. A thermally conductive spacer can be used, if the case of the device must be electrically isolated, but its added contribution to thermal resistance has to be considered. |
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Mô tả tương tự - TS1583CZ533 |
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