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BA00DD0WCP-V5 Datasheet(PDF) 6 Page - Rohm |
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BA00DD0WCP-V5 Datasheet(HTML) 6 Page - Rohm |
6 / 10 page Technical Note BA00DD0WCP-V5,BA00DD0WHFP,BA00DD0WT, BA00CC0WT,BA00CC0WT-V5,BA00CC0WCP-V5,BA00CC0WFP 6/9 www.rohm.com 2010.02 - Rev.B © 2010 ROHM Co., Ltd. All rights reserved. ● Thermal Design HRP5 To225FP-5 TO252-5 Fig.30 Fig.31 Fig.32 When using at temperatures over Ta=25℃, please refer to the heat reducing characteristics shown in Fig.30 through 32. The IC characteristics are closely related to the temperature at which the IC is used, so it is necessary to operate the IC at temperatures less than the maximum junction temperature TjMAX. Fig.31 shows the acceptable loss and heat reducing characteristics of the TO220FP package The portion shown by the diagonal line is the acceptable loss range that can be used with the IC alone. Even when the ambient temperature Ta is a normal temperature (25℃), the chip (junction) temperature Tj may be quite high so please operate the IC at temperatures less than the acceptable loss Pd. The calculation method for power consumption Pc(W) is as follows : Pc = (Vcc-Vo)×Io+Vcc×Icca Acceptable loss Pd≦Pc Solving this for load current IO in order to operate within the acceptable loss, Io≦ ( Please refer to Figs.8 and 20 for Icca.) It is then possible to find the maximum load current IoMAX with respect to the applied voltage Vcc at the time of thermal design. Calculation Example Example 1) When Ta=85℃, Vcc=8.3V, Vo=3.3V, BA33DD0WT Io≦ With the IC alone : θja=62.5℃/W → -16mW/℃ Io≦200mA (Icca : 2mA) 25℃=2000mW → 85℃=1040mW Please refer to the above information and keep thermal designs within the scope of acceptable loss for all operating temperature ranges. The power consumption Pc of the IC when there is a short circuit (short between Vo and GND) is : Pc=Vcc×(Icca+Ishort) Ishort : Short circuit current ● Terminal Vicinity Settings and Cautions ・ Vcc Terminal Please attach a capacitor (greater than 0.33μF) between the Vcc and GND. The capacitance values differ depending on the application, so please chose a capacitor with sufficient margin and verify the operation on an actual board. ・ CTL Terminal The CTL terminal is turned ON at 2.0V and higher and OFF at 0.8V and lower within the operating power supply voltage range. The power supply and the CTL terminal may be started up and shut down in any order without problems. Pd – Vcc×Icca Vcc-Vo 1.04-8.3×Icca 5 0.0 0.4 0.8 1.2 1.6 2.0 0 25 50 75 100 125 150 Ambient temperature:Ta(℃) 0 1 2 3 4 5 6 7 8 9 10 0 25 50 75 100 125 150 Ambient temperature:Ta(℃) 0 5 10 15 20 25 0 25 50 75 100 125 150 Ambient temperature:Ta(℃) ③ 7.3W ② 5.5W ① 2.3W ( 1)20.0 ( 2)2.0 1.30 Board size : 70×70×1.6 ㎜ 3 (board contains a thermal) Board front copper foil area : 10.5×10.5 ㎜ 2 ① 2-layer board (back surface copper foil area :15×15 ㎜ 2) ② 2-layer board (back surface copper foil area :70×70 ㎜ 2) ③ 4-layer board (back surface copper foil area :70×70 ㎜ 2) ( 1) When using a maximum heat sick : θj-c=6.25(℃/W) ( 2) When using an IC alone : θj-c=62.5(℃/W) Mounted on a Rohm standard board Board size : 70×70×1.6 ㎜ Copper foil area :7×7 ㎜ TO252-5θja=96.2(℃/W) Vcc: Vo: Io: Icca: Input voltage Output voltage Load current Circuit current |
Similar Part No. - BA00DD0WCP-V5_10 |
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Similar Description - BA00DD0WCP-V5_10 |
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