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| 型号： | BA7808CP-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 8V 1A TO-220CP-3 |
| 特色产品： | CMOS LDO Regulators |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 8V |
| 输入电压： | 10.5 V ~ 23 V |
| 电压 - 压降（标准）： | 2V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A（最小值） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-3 全封装截切引线 |
| 供应商设备封装： | TO-220CP-3 |
| 包装： | 剪切带 (CT) |
| 其它名称： | BA7808CP-E2CT |
BA78 □□ Series,BA78M □□ Series
Technical Note
● 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 × I ｂ
permissible loss Pd ≧ Pc
Vin
Vo
: Input Voltage
: Output Voltage
Io ≦
Pd ? Vin ? Ib
Vin ? Vo
Io
Ib
: Output Current
: Bias current
Maximum Output current Io MAX can be calculated in thermal design.
? Calculation example
Ex.1)
Ta=85 ℃ , Vin =7.5V, Vo=5.0V
Using TO220CP-3 alone
1.04 ? 7.5 ? 4.5m
Io ≦
7.5 ? 5.0
θ ja=62.5 ℃ /W → 16mW/ ℃
Pd=1.04W at 85 ℃
Io ≦ 400 ｍ A
Be sure to use this IC within a power dissipation at the range of operating temperature.
25
(1) 22.0
(1) Mounted on infinity Alminium heat sink θ j-c=5.7( ℃ /W)
(2) Using an IC alone θ j-a=62.5 ℃ /W
12.5
(1) 10.0
(1) Mounted on infinity Alminium heat sink θ j-c=12.5 ( ℃ /W)
(2) Using an IC alone θ j-a=125.0 ℃ /W
20
15
10
5
0
(2) 2.0
10
7.5
5
2.5
0
(2) 1.0
0
25
50
75
100
125
150
0
25
50
75
100
125
150
AMBIENT TEMPERATURE : Ta[ ℃ ]
AMBIENT TEMPERATURE : Ta[ ℃ ]
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.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
10/12
2012.03 - Rev.C
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