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BAXXJC5 Datasheet(Fiches technique) 5 Page - Rohm

Numéro de pièce BAXXJC5
Description  1.5A Secondary LDO Regulators for Local Power Supplies
Télécharger  10 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
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BA□□JC5 Series,BA00JC5W Series
Technical Note
5/9
www.rohm.com
2009.04 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
Thermal Derating Curve
 TO220FP-3/TO220FP-5/TO220FP-5 (V5)
Fig.17
The characteristics of the IC are greatly influenced by the operating temperature. If the temperature exceeds the maximum
junction temperature Tjmax, deterioration or damage may occur. Implement proper thermal designs to ensure that power
dissipation is within the permissible range in order to prevent instantaneous damage resulting from heat and maintain the
reliability of the IC for long-term operation.
The following method is used to calculate the power consumption Pc (W):
Pc = (Vcc – Vo)
 Io + Vcc  Icca
Power dissipation Pd ≥ Pc
The load current Io is calculated:
Calculation Example:
Vcc = 6.0V and Vo = 5.0V at Ta = 85℃
Refer to the above and implement proper thermal designs so that the IC will not be used under excessive power dissipation
conditions under the entire operating temperature range.
The power consumption Pc of the IC in the event of shorting (i.e. the Vo and GND pins are shorted) can be obtained from the
following equation: Pc = Vcc
 (Icca + Ishort) (Ishort: short current)
0
15
25
20
10
5
25
50
75
125
150
100
0
AMBIENT TEMPERATURE:Ta [°C]
(1)20.0
(2)2.0
(2) During IC without heat sink operation.
j-a = 62.5 (°C/W)
(1) When using an infinite heat sink.
j-c = 6.25 (°C/W)
ja = 62.5°C/W  −16.0mW/°C
25°C = 2000mW
 85°C = 1040mW
Vcc : Input voltage
Vo
: Output current
IO
: Load current
Icca : Circuit current
Io ≤
Pd − Vcc
 Icca
Vcc − Vo
1.040 − 6.0
 Icca
6.0 − 5.0
Io ≤ 860mA (Icca
 30mA)




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