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BA7812CP Datasheet(PDF) 9 Page - Rohm |
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BA7812CP Datasheet(HTML) 9 Page - Rohm |
9 / 13 page BA78□□Series,BA78M□□Series Technical Note 9/12 www.rohm.com 2012.03 - Rev.C © 2012 ROHM Co., Ltd. All rights reserved. ●Internal Circuit Structural Diagram TO220CP-3 TO252-3 PIN No. Symbol Function PIN No. Symbol Function 1 INPUT Input terminal 1 INPUT Input terminal 2 COMMON Ground terminal 2 N.C. Non connection terminal 3 OUTPUT Output terminal 3 OUTPUT Output terminal FIN COMMON Ground terminal ●Protection Circuit (1)Over-current protection circuit (2) Thermal shutdown circuit (3) Safety operation area control circuit Q5 R4 R10 R5 R6 R7 R8 Q8 R9 Q9 R13 Q17 Q16 Q15 Q13 Q10 Q6 Q18 Q14 Q1 Q7 Q2 R21 R17 R20 R12 R19 Q11 Q3 R14 R3 R18 R1 R15 R11 C1 D2 D1 Q12 R2 D3 INPUT OUTPUT COMMON R22 Q4 R16 FIN 12 3 When the chip temperature of IC exceeds the setting temperature, the IC goes OFF, and it controls the IC not to be destroyed by the heat generation. It can be restored by being lowered the chip temperature of IC below the setting temperature. It controls the output current in inverse proportion ratio to voltage difference (input-output). When voltage difference becomes bigger, the IC will be destroyed in rush current. It protects the IC by controlling the current ability according to the voltage level. When the maximum rating current or more is rushed, it controls the current ability and protects the IC from destruction. 6 Chip Junction temperature : Tj [℃] 175 50 25 Vin=10V BA7805CP 75 100 125 150 200 5 4 3 2 1 0 2 1 Vin=10V BA7805CP 6 5 4 3 2 1 0 Output Current : IO[A] Input-Output voltage difference: Vin-Vo [V] 30 20 40 2 0 10 1.5 1 0.5 Tj=25℃ BA7805CP |
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