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7812SR-C PDF 데이터시트 ( Data , Function )

부품번호 7812SR-C 기능
기능 3.3V/5V/12V Outputs High-Effi ciency Switching Regulators
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7812SR-C 데이터시트, 핀배열, 회로
www.murata-ps.com
78xxSR Series
3.3V/5V/12V Outputs High-Efficiency
Switching Regulators with LM78xx Pinouts
FEATURES
3.3V/0.5A, 5V/0.5A or 12V/0.4A outputs; Pin and
size-compatible with LM7805 & LM7812 regulators
Up to 95% efficiency – no heat sinks or thermal
derating required
Two SIP-packages fit existing TO-220 footprints:
- Vertical-pin models occupy less than 0.1 square in.
- Optional horizontal pins provide 0.350 in. installed
height
+7.5-36Vdc operating input range; Low 3mA
quiescent current
Built-in filter capacitors – no external components
required
–40 to +70°C operation at full load; Short-circuit
protection
Excellent load (±0.2%) and line (±0.3%) regulation
Ideal for powering instrumentation from
9V/12V/24V/28V supplies or batteries
Can be used with unregulated dc supplies
protection
Ordering Information
MPS Part No.
Output
Voltage
Standard Pin Package
7803SR-C
+3.3Vdc
7805SR-C
+5.0Vdc
7812SR-C
+12.0Vdc
Horizontal Pin Package
7803SRH-C
+3.3Vdc
7805SRH-C
+5.0Vdc
7812SRH-C
+12.0Vdc
Output
Current
0.5A
0.5A
0.4A
0.5A
0.5A
0.4A
Input
Voltage
+7.5-36Vdc
+7.5-36Vdc
+15-36Vdc
+7.5-36Vdc
+7.5-36Vdc
+15-36Vdc
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
Murata Power Solutions’ 7805SR-C (5V output), 7812SR-C (12V output) and 7803SR-C
(3.3V output) step-down switching regulators are modern drop-in replacements for older,
inefficient, LM7805 and LM7812 linear regulators. The 78XXSR's are pin- and size-compat-
ible with industry-standard TO-220 SIP packages. A 260kHz switching frequency provides
for efficiencies as high as 95%. Full-load (up to 0.5A) operation from 9V, 12V, 24V, or 36V
supplies at ambient temperatures up to +70°C requires no heat sinks, no temperature
derating, no forced-air cooling, and no external capacitors.
78SR switching regulators provide many significant improvements over their linear coun-
terparts: lower quiescent current (3mA vs. 5 mA), higher input voltage (40V vs. 32V), and
better output accuracy (±2% vs. ±5%). All these features combine to make 78SR regulators
ideal for new or existing LM7805 & LM7812 applications requiring full-load operation at
elevated voltages.
TECHNICAL NOTES
1. Input/Output (I/O) Filtering: As shown in the noise and ripple graphs, 78SR switching
regulators exhibit excellent low-noise performance with no external I/O capacitors.
However, if additional noise reduction is required, be sure to use low-ESR capacitors
that are rated for continuous operation (with an additional 20% safety margin) at the
highest system voltages and temperatures. Adding external output capacitors will also
improve the unit’s load-transient response.
Applications in which 78SR regulators are located more than 24 inches (61cm) from
the input power supply should include an external 47uF/50V (or greater) aluminum
electrolytic capacitor, connected as close as possible to the regulator’s +Vin and
GND terminals (pins 1 and 2). An external input capacitor is particularly important if
the input voltage is applied to the regulator via a mechanical switch or relay. Contact
bounce at turn-on can produce large inductive current-spikes, and these current
spikes can generate damaging voltage transients at the regulator’s input terminals.
2. Input Fusing: 78SR switching regulators are not internally fused. If fusing their input
and/or output terminals is required, use the data shown in the Efficiency Curves as a
guide to selecting an appropriate slow-blow fuse.
3. Input-Output Isolation: 78SR regulators’ internal input and output circuits share a
common connection (GND, pin 2); there is no electrical isolation between the INPUT
(pin 1) and OUTPUT (pin 3) terminals.
4. Overvoltage Protection: 78SR switching regulators do not provide input or output
overvoltage protection. In the extremely rare situation in which a catastrophic failure
occurs, the output voltage may rise to excessively high levels. If your load must be
protected against all possible overvoltage situations, external voltage-limiting circuitry
must be provided.
5. Operation at 40Vdc: Operating with inputs up to 40Vdc is permissible if, for inputs
between 36 and 40Vdc, the maximum load current is reduced to 0.35A for 7805SR-C
and 7803SR-C, and to 0.3A for 7812SR-C. Under no circumstances should the input
voltage be allowed to exceed 45Vdc.
30 Oct 2015 MDC_78xxSR Series.B07 Page 1 of 7




7812SR-C pdf, 반도체, 판매, 대치품
7803SR-C 10% to 100% Load Step
78xxSR Series
3.3V/5V/12V Outputs High-Efficiency
Switching Regulators with LM78xx Pinouts
Transient Response - 90% Load Step
7805SR-C 10% to 100% Load Step
7812SR-C 10% to 100% Load Step
VIN = 9V
VIN = 9V
VIN = 18V
7803SR-C 100% to 10% Load Step
VIN = 9V
7805SR-C 100% to 10% Load Step
VIN = 9V
7812SR-C 100% to 10% Load Step
VIN = 18V
www.murata-ps.com/support
30 Oct 2015 MDC_78xxSR Series.B07 Page 4 of 7

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7812SR-C 전자부품, 판매, 대치품
MECHANICAL DIMENSIONS: Inches (mm)
TOLERANCES: 2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
0.19
(4.8)
78xxSR Series
3.3V/5V/12V Outputs High-Efficiency
Switching Regulators with LM78xx Pinouts
Standard Package
0.41
(10.4)
L1
0.23
(5.7)
0.75
(19.1)
Pins: 0.025 (0.64) sq.
0.100 (2.54)
centers
PC-Board Hole:
0.037 - 0.043
(0.94 - 1.09) Dia.
1
123
0.15
(3.8) Min.
low-profile package
0.37
(9.3) max.
0.15
(3.8) min.
0.07
(1.8)
L1
Horizontal Package
(H Pin Option)
123
Pins: 0.025 (0.64) sq.
0.100 (2.54)
centers
PC-Board Hole:
0.037 - 0.043
(0.94 - 1.09) Dia.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
www.murata-ps.com/support
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2015 Murata Power Solutions, Inc.
30 Oct 2015 MDC_78xxSR Series.B07 Page 7 of 7

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7812SR-C

3.3V/5V/12V Outputs High-Effi ciency Switching Regulators

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