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BA30BC0WFP Fiches technique(PDF) 5 Page - Rohm |
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BA30BC0WFP Fiches technique(HTML) 5 Page - Rohm |
5 / 10 page BA□□BC0 Series,BA□□BC0W Series,BA00BC0W Series Technical Note 5/8 www.rohm.com 2010.02 - Rev.B © 2010 ROHM Co., Ltd. All rights reserved. Input / Output Equivalent Circuit Diagrams Thermal Derating Curves TO220FP-3/TO220FP-5/TO220FP-5V5) TO252-3/TO252-5 Fig.18 Fig.19 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 = 6.0 V and Vo = 5.0 V at Ta = 85°C 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 = 96.2°C/W → −10.4 mW/°C 25°C = 1300 mW → 85°C = 676 mW 31kΩ 2kΩ 27kΩ CTL Vcc R2 R1 Vcc OUT Fig.16 Fig.17 Vcc : Input voltage Vo : Output current IO : Load current Icca : Circuit current * For the BA00BC0WT, connect R1 and R2 externally between the C and GND pins and between the OUT and C pins. 0 1.2 2.0 1.6 0.8 0.4 25 50 75 125 150 100 0 AMBIENT TEMPERATURE:Ta [°C] 1.30 IC mounted on a ROHM standard board Board size: 70 70 1.6 mm Copper foil area: 7 7 mm TO252-5 ja=96.2 (°C/W) TO252-3 ja=104.2 (°C/W) TO252-5 TO252-3 Equation: VOUT = Vc (R1 + R2) / R1 (Vc = 1.25 V (Typ.)) The recommended R1 value is approximately 30 k to 150 k. Io ≤ Pd − Vcc Icca Vcc − Vo 0.676 − 6.0 Icca 6.0 − 5.0 Io ≤ 550 mA (Icca 20 mA) |
Numéro de pièce similaire - BA30BC0WFP |
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Description similaire - BA30BC0WFP |
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