L7808ABV STMicroelectronics, L7808ABV Datasheet - Page 14

• Manufacturer Part Number: L7808ABV
• Description: IC REGULATOR PREC 1.5A 8V TO-220
• Manufacturer: STMicroelectronics
• Type: Voltage Regulatorr

Specifications of L7808ABV

• Regulator Topology: Positive Fixed
• Voltage - Output: 8V
• Voltage - Input: Up to 35V
• Voltage - Dropout (typical): 2V @ 1A
• Number Of Regulators: 1
• Current - Output: 1.5A
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220-3 (Straight Leads)
• Polarity: Positive
• Number Of Outputs: 1
• Output Type: Fixed
• Output Voltage: 8 V
• Output Current: 1 A
• Line Regulation: 80 mV
• Load Regulation: 100 mV
• Dropout Voltage (max): 2 V
• Input Voltage Max: 35 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: Through Hole
• Voltage Regulation Accuracy: 2 %
• Current, Output: 1 A
• Current, Supply: 6 mA
• Package Type: TO-220
• Regulation, Line: 12 mV
• Regulation, Load: 25 mV
• Regulator Type: Positive Voltage Out
• Resistance, Thermal, Junction To Case: 3 °C/W
• Temperature, Operating, Range: -40 to +125 °C
• Voltage, Dropout: 2 V
• Voltage, Input: 14 V
• Voltage, Noise: 10 μV/V
• Voltage, Output: 8 V
• Voltage, Supply, Rejection Ratio: 62 dB
• Primary Input Voltage: 14V
• Output Voltage Fixed: 8V
• Dropout Voltage Vdo: 2V
• No. Of Pins: 3
• Voltage Regulator Case Style: TO-220
• Operating Temperature Range: -40°C To +125°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-1446-5

L7800AB/AC SERIES
APPLICATION INFORMATION
DESIGN CONSIDERATION
The L7800A Series of fixed voltage regulators are
designed with Thermal Overload Protection that
shuts down the circuit when subjected to an
excessive power overload condition, Internal
Short-circuit Protection that limits the maximum
current the circuit will pass, and Output transistor
Safe-Area Compensation that reduces the output
short-circuit current as the voltage across the pass
transistor is increased. In many low current
applications, compensation capacitors are not
required. However, it is recommended that the
regulator input be bypassed with capacitor if the
regulator is connected to the power supply filter
with long lengths, or if the output load capacitance
is large. An input bypass capacitor should be
selected
characteristics to insure stable operation under all
load conditions. A 0.33mF or larger tantalum,
mylar or other capacitor having low internal
impedance at high frequencies should be chosen.
The bypass capacitor should be mounted with the
shortest possible leads directly across the
regulators
construction techniques should be used to
minimize ground loops and lead resistance drops
since the regulator has no external sense lead.
The addition of an operational amplifier allows
adjustment to higher or intermediate values while
retaining regulation characteristics. The minimum
voltage obtained with the arrangement is 2V
greater than the regulator voltage.
The circuit of figure 6 can be modified to provide
supply protection against short circuit by adding a
short circuit sense resistor, RSC, and an
additional PNP transistor. The current sensing
PNP must be able to handle the short circuit
current of the three terminal regulator Therefore a
four ampere plastic power transistor is specified.
Figure 4 : DC Parameter
14/21
I
O
=
V
R
xx
to
1
input
+ I
d
provide
terminals.
good
high
Normally
frequency
good
Figure 5 : DC Parameter
Figure 6 : DC Parameter
Figure 7 : DC Parameter
V
V
O
I
R
I
- V
, 7.0 to 20V
O
1
= I
=
O
REG
2.0V
I
REQ
V
+ Q
BEQ1
-
1
I
Q1
(I
Q1
REG
V
BEQ1
R
1