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BA17817FP 데이터시트(PDF) 10 Page - Rohm |
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BA17817FP 데이터시트(HTML) 10 Page - Rohm |
10 / 13 page BA78□□Series,BA78M□□Series Technical Note 10/12 www.rohm.com 2009.11 - Rev.B © 2009 ROHM Co., Ltd. All rights reserved. ● Thermal design Refer to the following thermal derating curves (Fig. 25, 26), when using in the status of Ta=25℃ or more. The characteristic of IC is greatly related to the operating temperature. When it is used in over maximum junction temperature, the elements inside IC might become weaker and be destroyed. It is recommended to take into consideration thermal of IC. Note that the temperatures are in the allowed temperature limits and operated within Pd. It is necessary to operate it at junction temperature Tjmax or less to prevent IC from the thermal destruction. Please operate IC within permissible loss Pd because the junction temperature Tj might become considerably a high temperature even if ambient temperature Ta is normal temperature (25℃). Power consumption Pc(W) may be expressed by the equation shown below: Pc=(Vin-Vo)×Io+ Vin×Ib permissible loss Pd≧Pc Maximum Output current IoMAX can be calculated in thermal design. ・ Calculation example Ex.1) Ta=85℃, Vin =7.5V, Vo=5.0V Io≦400mA Be sure to use this IC within a power dissipation at the range of operating temperature. Fig.25 Thermal derating curve (TO220CP-3) Fig.26 Thermal derating curve (TO252-3) ● Terminal Setting and Cautions ・ INPUT It is recommended that a capacitor (about 0.33uF) be inserted between INPUT and COMMON. The value of capacitor is designed suitable for the actual application. ・ OUTPUT It is recommended that a capacitor (about 0.1uF) be inserted between OUTPUT and COMMON. A tantalum capacitor can also be used for this pin because insufficient capacitors may cause oscillation by a temperature change. ・ COMMON Keep the no voltage drop between Ground level of set board and IC. When there is the voltage difference, setting voltage becomes inaccuracy and unstable. It is recommended to connect by wide, short pattern, and lower the inpedance. Vo Vin Ib Vin Pd Io ≦ 5.0 7.5 4.5m 7.5 1.04 Io ≦ Vin : Input Voltage Vo : Output Voltage Io : Output Current Ib : Bias current Using TO220CP-3 alone θ ja=62.5℃/W→16mW/℃ Pd=1.04W at 85℃ 12.5 10 7.5 5 2.5 0 0 25 50 75 125 100 150 AMBIENT TEMPERATURE : Ta[℃] (2) 1.0 (1) 10.0 (1) Mounted on infinity Alminium heat sinkθj-c=12.5 (℃/W) (2) Using an IC aloneθj-a=125.0℃/W 25 20 15 10 5 0 0 25 50 75 125 100 150 AMBIENT TEMPERATURE : Ta[℃] (2) 2.0 (1) 22.0 (1) Mounted on infinity Alminium heat sinkθj-c=5.7(℃/W) (2) Using an IC aloneθj-a=62.5℃/W |
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