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BA00CC0WFP Datenblatt(PDF) 6 Page - Rohm

Teilenummer BA00CC0WFP
Bauteilbeschribung  Standard Variable Output LDO Regulators
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Hersteller  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BA00CC0WFP Datenblatt(HTML) 6 Page - Rohm

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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(℃)
7.3W
5.5W
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
2-layer board (back surface copper foil area :15×15 ㎜ 2)
2-layer board (back surface copper foil area :70×70 ㎜ 2)
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


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