BL78A05
Positive voltage regulators
1. Features
•
•
•
•
•
Output current to 1.5 A
Output voltage of 5V
Thermal overload protection
Short circuit protection
Output transition SOA protection
2. Description
The BL78A05 of three-terminal positive regulators is available in TO-220 package, making it useful
in a wide range of applications. These regulators can provide lacal on-card regulation, eliminating the
distribu
tion problems associated with single point regulation. Each type employs internal current limiting, thermal
shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is
provided, they can deliver over 1.5 A output current. Although designed primarily as fixed voltage regulators,
these devices can be used with external components to obtain adjustable voltage and currents
Block diagram
1
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BL78A05
Positive voltage regulators
Schematic diagram
3.Maximum ratings
Absolute maximum ratings
Symbol
V
I
I
O
P
D
T
STG
T
OP
Parameter
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
BL78A05
V
O
= 5 V
Value
35
Internally limited
Internally limited
-40 to 125
0 to 125
°
C
°
C
Unit
V
Note:
Absolute maximum ratings are those values beyond which damage to
the device may occur. Functional operation under these condition is not implied.
2
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BL78A05
Positive voltage regulators
4.Electrical characteristics
Electrical characteristics of BL78A05
(refer to the test circuits, T = -40 to
J
125° V
I
= 11 V, I
O
= 500mA, C
I
= 0.33 µF, C
O
= 0.1 µF unless
otherwise
C,
specified)
Symbol
V
O
Parameter
Output voltage
Test conditions
T
J
= 25°
C
I
O
= 5 mA to 1 A, P
O
≤15 W V
I
= 8 to 20 V
Min.
4.85
Typ.
5
Max.
5.15
Unit
V
V
O
Output voltage
4.65
5
5.35
V
V
I
= 7 to 25 V, T
J
= 25°
C
Δ V
O(1)
Line regulation
V
I
= 8 to 12 V, T
J
= 25°
C
3
50
mV
1
25
I
O
= 5 mA to 1.5 A, T
J
= 25°
C
Δ V
O(1)
Load regulation
I
O
= 250 to 750 mA, T
J
= 25°
C
100
mV
25
I
d
Quiescent current
T
J
= 25°
C
8
mA
I
O
= 5 mA to 1 A
Δ I
d
Quiescent current change
V
I
= 8 to 25 V
Δ V
O
/ÄT
0.5
mA
0.8
Output voltage drift
I
O
= 5 mA
0.6
mV/°
C
eN
Output noise voltage
B =10 Hz to 100 kHz, T
J
= 25°
C
40
µV/V
O
SVR
Supply voltage rejection
V
I
= 8 to 18 V, f = 120 Hz
68
dB
V
d
Dropout voltage
I
O
= 1 A, T
J
= 25°
C
2
2.5
V
R
O
Output resistance
f = 1 kHz
17
mÙ
I
sc
Short circuit current
V
I
= 35 V, T
J
= 25°
C
0.75
1.2
A
I
scp
1.
Short circuit peak current
T
J
= 25°
C
1.3
1.9
2.2
A
Load and line regulation are specified at constant junction temperature. Changes in V
O
due
to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
3
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BL78A05
Positive voltage regulators
5. Test circuits
DC parameter
Load regulation
Ripple rejection
4
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BL78A05
Positive voltage regulators
6.Package mechanical data
NOTES:
A) CONFIRMS TO JEDEC TO-220 VARIATION AB
EXCEPT WHERE NOTED
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS ARE EXCLUSIVE OF BURRS,
MOLD FLASH, AND TIE BAR EXTRUSIONS.
5
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