MC7809CD2T ON Semiconductor, MC7809CD2T Datasheet - Page 21
![IC REG POS VOLT 1A 9V D2PAK](/photos/16/14/161422/to263-3_sml.jpg)
MC7809CD2T
Manufacturer Part Number
MC7809CD2T
Description
IC REG POS VOLT 1A 9V D2PAK
Manufacturer
ON Semiconductor
Datasheet
1.MC7805BDTRKG.pdf
(33 pages)
Specifications of MC7809CD2T
Regulator Topology
Positive Fixed
Voltage - Output
9V
Voltage - Input
Up to 35V
Voltage - Dropout (typical)
2V @ 1A
Number Of Regulators
1
Current - Output
1A
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TO-263-2, D⊃2Pak (2 leads + Tab), TO-263AB
Polarity
Positive
Number Of Outputs
1
Output Type
Fixed
Output Voltage
9 V
Output Current
1 A
Line Regulation
32 mV
Load Regulation
35 mV
Input Voltage Max
35 V
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Voltage Regulation Accuracy
4 %
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Limit (min)
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC7809CD2T
Manufacturer:
ON/安森美
Quantity:
20 000
Company:
Part Number:
MC7809CD2TG
Manufacturer:
ON Semiconductor
Quantity:
1 550
Part Number:
MC7809CD2TG
Manufacturer:
ON/安森美
Quantity:
20 000
Company:
Part Number:
MC7809CD2TR4
Manufacturer:
ON Semiconductor
Quantity:
1 250
Part Number:
MC7809CD2TR4G
Manufacturer:
ON/安森美
Quantity:
20 000
Design Considerations
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.
capacitors are not required. However, it is recommended
that the regulator input be bypassed with a capacitor if the
regulator is connected to the power supply filter with long
Input
The MC7800 regulators can also be used as a current source when
connected as above. In order to minimize dissipation the MC7805C is
chosen in this application. Resistor R determines the current as follows:
For example, a 1.0 A current source would require R to be a 5.0 W,
10 W resistor and the output voltage compliance would be the input
voltage less 7.0 V.
The MC7800 series can be current boosted with a PNP transistor. The
MJ2955 provides current to 5.0 A. Resistor R in conjunction with the V
of the PNP determines when the pass transistor begins conducting; this
circuit is not short circuit proof. Input/output differential voltage minimum is
increased by V
The MC7800 Series of fixed voltage regulators are
In many low current applications, compensation
≥ 10 mF
R
Source
0.33 mF
Input
Figure 11. Current Boost Regulator
XX = 2 digits of type number indicating voltage.
MJ2955 or Equiv.
BE
I
Figure 9. Current Regulator
B
R
1.0 mF
^ 3.2 mA over line and load changes.
of the pass transistor.
I
O
MC7805
+
0.33 mF
5.0 V
R
MC78XX
) I
B
I
O
R
Constant
Current to
Grounded
Load
APPLICATIONS INFORMATION
1.0 mF
Output
BE
http://onsemi.com
21
wire lengths, or if the output load capacitance is large. An
input bypass capacitor should be selected to provide good
high−frequency characteristics to insure stable operation
under all load conditions. A 0.33 mF 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 input terminals. Normally good
construction techniques should be used to minimize ground
loops and lead resistance drops since the regulator has no
external sense lead.
Input
Input
≥ 10 mF
The addition of an operational amplifier allows adjustment to higher or
intermediate values while retaining regulation characteristics. The
minimum voltage obtainable with this arrangement is 2.0 V greater than the
regulator voltage.
The circuit of Figure 11 can be modified to provide supply protection
against short circuits by adding a short circuit sense resistor, R
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.
R
Source
Figure 10. Adjustable Output Regulator
0.33 mF
Figure 12. Short Circuit Protection
R
1.0 k
XX = 2 digits of type number indicating voltage.
MC7805
or Equiv.
2N6049
R
1.0 mF
SC
V
V
6
O
IN
= 7.0 V to 20 V
= V
or Equiv.
MJ2955
4
O
7
≥ 2.0 V
MC1741G
2
3
0.33 mF
MC78XX
10 k
SC
Output
, and an
0.1 mF
Output