BA78 ROHM [Rohm], BA78 Datasheet - Page 9

• Manufacturer Part Number: BA78
• Description: 1A Output 78 series Regulators 500mA Output 78 series Regulators
• Manufacturer: ROHM [Rohm]

●Internal Circuit Structural Diagram
●Protection Circuit
© 2009 ROHM Co., Ltd. All rights reserved.
BA78□□Series,BA78M□□Series
www.rohm.com
(2) Thermal shutdown circuit
(3) Safety operation area control circuit
(1)Over-current protection circuit
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 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.
When the maximum rating current or more is rushed, it controls the
current ability and protects the IC from destruction.
PIN No.
1
2
3
COMMON
OUTPUT
Symbol
D1
INPUT
R4
TO220CP-3
R10
R5
R6
R7
Q12
R22
Ground terminal
Output terminal
Input terminal
Q18
Function
Q14
R1
Q1
Q13
R18
Q10
R8
Q8
Q5
Q7
R2
R3
Q6
Q2
9/12
R15
C1
R14
Q4
D3
R9
Q15
Q9
Q3
R16
R13
D2
PIN No.
FIN
1
2
3
Q11
R21
R17
Q16
R20
R19
COMMON
OUTPUT
Q17
R12
Symbol
R11
INPUT
N.C.
TO252-3
COMMON
INPUT
OUTPUT
Input-Output voltage difference: Vin-Vo [V]
1 2 3
FIN
0.5
1.5
6
5
4
3
2
0
6
5
3
2
0
1
4
1
1
0
2
25
Chip Junction temperature : Tj [ ℃ ]
Non connection terminal
Output Current : I
50
Vin=10V
BA7805CP
Ground terminal
Output terminal
10
Input terminal
75 100 125 150
Function
1
Technical Note
2009.11 - Rev.B
20
Tj=25 ℃
BA7805CP
Vin=10V
BA7805CP
O
[A]
2
30
175
200
40