7803SRH [MURATA]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid;型号: | 7803SRH |
厂家: | muRata |
描述: | DC-DC Regulated Power Supply Module, 1 Output, Hybrid |
文件: | 总5页 (文件大小:1391K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
78xxSR Series
3.3V/5V/12V Outputs High-Efficiency
Switching Regulators with LM78xx Pinouts
For full details go to
www.cd4power.com/rohs
DATEL’s 7805SR (5V output), 7812SR (12V output) and 7803SR (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-compatible 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
counterparts: lower quiescent current (3mA vs. 5 mA), higher input voltage (40V vs. 32V),
and better output accuracy (±1.5% 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.
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
TECHNICAL NOTES
1. Input/Output (I/O) Filtering: As shown in the noise and ripple graphs, 78SR switch-
ing 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.
–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
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.
Ordering Information
DATEL Part No.
Output
Voltage
Output
Current Voltage
Input
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.
Standard Pin Package
7803SR
7805SR
7812SR
Horizontal Pin Package
7803SRH
7805SRH
7812SRH
+3.3Vdc
+5.0Vdc
+12.0Vdc 0.4A
0.5A
0.5A
+7.5-36Vdc
+7.5-36Vdc
+15-36Vdc
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.
+3.3Vdc
+5.0Vdc
+12.0Vdc 0.4A
0.5A
0.5A
+7.5-36Vdc
+7.5-36Vdc
+15-36Vdc
4. Overvoltage Protection: 78SR switching regulators do not provide input or output over-
voltage 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 and
7803SR, and to 0.3A for 7812SR. Under no circumstances should the input voltage be
allowed to exceed 45Vdc.
D I G I T A L P A N E L M E T E R S
For updated, full-size data sheets visit: www.cd4power.com
MPM_78SR_G00 Page 1 of 5
H I G H - E F F I C I E N C Y S W I T C H I N G R E G U L A T O R S
78SR Series
Performance/Functional Specifications
Typical at TA = +25°C
TECHNICAL NOTES (continued)
6. Soldering & Handling Precautions: All units are designed to be
hand soldered to pc-boards using no-clean solders (+260°C, 5
seconds max.). Water-soluble solders can also be used, but the units
must be washed and dried using processes appropriate to the type of
solder employed. See the Mechanical Specifications section for pin 1
orientation and recommended plated-through hole dimensions.
Input/Output
Models
7803SR
+3.3Vdc
0.5A
7805SR
+5.0Vdc
0.5A
7812SR
+12.0Vdc
0.4A
Output Voltage
Rated Output Current
Output Voltage Accuracy
Input Voltage Range ➀
Line Regulation (100% load)
Load Regulation (0-100% load)
Quiescent Current
Input Current
±2%
±1.5%
±2%
+7.5-36Vdc +7.5-36Vdc +15-36Vdc
While 78SR regulators easily withstand a 2kV ESD discharge to any
terminal (using human body model), they should always be treated as
ESD sensitive devices.
±0.3%
±0.2%
±0.3%
±0.2%
±0.3%
±0.2%
3mA typ., 5mA max.
7. Horizontal-Pin Models (78XXSRH): 78XXSRH switching regulators
are pin-compatible replacements for TO-220 style LM78XX linear
regulators that are installed with their metal tabs lying flat on the sur-
face of the pc-board. However, because the surface of inductor L1 on
78XXSRH models is electrically conductive, it must not be allowed to
come in contact with any exposed pc-board traces, other than power
ground (GND).
See Performance Curves
See Performance Curves
See Performance Curves
See Performance Curves
Continuous
Efficiency
Transient Response
Input & Output Noise
Short Circuit Protection ➁
Isolation
None
Overvoltage Protection
Undervoltage Protection
Environmental
Models
None
While the 2-mil-thick (0.05mm) polyester label attached to L1 provides
some degree of electrical insulation (only if L1 sits perfectly flat on
the pc-board), it is recommended that a 0.020” (0.5mm) clearance be
maintained between L1 and all exposed pc-board traces.
None
7803SR
7805SR
–40 to +70°C
–40 to +85°C
Free Air Convection
0 to 85%
7812SR
Operating Temperature
Storage Temperature
Cooling
8. Dropout Voltage: 78SR series regulators described in this data sheet
specify a minimum input voltage at which full-load accuracy and
output regulation are guaranteed (7.5V for 7803SR and 7805SR, and
15.0V for 7812SR). However, these devices will stay in regulation at
lower input voltages if they are operated at less than their rated loads.
Humidity (Non-condensing)
Physical
Mechanical
See Mechanical Specifications
Open-frame SIP
The following dropout-voltage data, derived from sample testing
performed at an ambient temperature of +25°C with resistive loads,
should be used for information purposes only. For these tests, a unit
was considered to be out of regulation when its output changed by
more +/-0.005Vdc from its nominal value. All voltages were measured
directly at the regulator’s I/O pins.
Package
Pins
0.025” (0.64mm) square,
tin-plated bronze
Weight
0.08 ounces (2.2g)
Pin Soldering
+260°C for 5 seconds
➀ See Technical Note 5.
Typical Dropout Voltage
➁ While these regulators can withstand a continuous short-circuit across their
output terminals, they will experience a significant temperature rise. Extended
short-circuit operation will adversely affect the unit’s reliability.
0% Load
6.0V
25% Load
6.2V
50% Load
6.2V
100% Load
6.3V
7803SR
7805SR
7812SR
6.3V
6.2V
6.2V
6.8V
12.8V
13.0V
12.8V
13.0V
D I G I T A L P A N E L M E T E R S
MPM_78SR_G00 Page 2 of 5
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H I G H - E F F I C I E N C Y S W I T C H I N G R E G U L A T O R S
78SR Series
Typical Performance Curves TA = +25°C, VIN as indicated
Noise and Ripple - 10% and 100% Load, 20MHz Bandwidth
7803SR
Vin = 12V, ILOAD = 50mA
7805SR
Vin = 12V, ILOAD = 50mA
7812SR
Vin = 24V, ILOAD = 40mA
7803SR
Vin = 12V, ILOAD = 500mA
7805SR
Vin = 12V, ILOAD = 500mA
7812SR
Vin = 24V, ILOAD = 400mA
Transient Response - 90% Load Step
7803SR
10% to 100% Load Step
Vin = 9V
7805SR
10% to 100% Load Step
7812SR
10% to 100% Load Step
Vin = 18V
Vin = 9V
7803SR
100% to 10% Load Step
Vin = 9V
7812SR
100% to 10% Load Step
Vin = 18V
7805SR
100% to 10% Load Step
Vin = 9V
D I G I T A L P A N E L M E T E R S
MPM_78SR_G00 Page 3 of 5
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H I G H - E F F I C I E N C Y S W I T C H I N G R E G U L A T O R S
78SR Series
7803SR Efficiency
7803SR Input Current
90
85
80
75
70
65
60
55
50
0.25
0.20
100% LOAD
50% LOAD
25% LOAD
100% LOAD
0.15
0.10
50% LOAD
0.05
25% LOAD
0.00
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36
INPUT VOLTAGE
INPUT VOLTAGE
7805SR Efficiency
7805SR Input Current
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
95
90
85
80
75
70
65
60
100% LOAD
50% LOAD
100% LOAD
50% LOAD
25% LOAD
25% LOAD
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36
8
10 12 14 16 18 20 22 24 26 28 30 32 34 36
INPUT VOLTAGE
INPUT VOLTAGE
7812SR Efficiency
7812SR Input Current
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
100
95
90
85
80
75
70
100% LOAD
100% LOAD
50% LOAD
25% LOAD
50% LOAD
25% LOAD
14
16
18
20
22
24
26
28
30
32
34
36
14
16
18
20
22
24
26
28
30
32
34
36
INPUT VOLTAGE
INPUT VOLTAGE
D I G I T A L P A N E L M E T E R S
MPM_78SR_G00 Page 4 of 5
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H I G H - E F F I C I E N C Y S W I T C H I N G R E G U L A T O R S
78SR Series
MECHANICAL SPECIFICATIONS
MECHANICAL DIMENSIONS: Inches (mm)
Standard Package
TOLERANCES: 2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
0.41
0.19
(4.8)
(10.4)
L1
0.75
(19.1)
�
�
1
2
3
Pins: 0.025 (0.64) sq.
0.100 (2.54)
0.15
(3.8) Min.
centers
PC-Board Hole:
0.037 - 0.043
(0.94 - 1.09) Dia.
0.23
(5.7)
NEW
low-profile package
0.07
(1.8)
0.37
(9.3) max.
L1
1
2
3
Pins: 0.025 (0.64) sq.
0.100 (2.54)
0.15
(3.8) min.
centers
PC-Board Hole:
0.037 - 0.043
(0.94 - 1.09) Dia.
Horizontal Package
(H Pin Option)
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C&D Technologies, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
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ISO 9001 REGISTERED
© 2006 C&D Technologies, Inc.
DS-0540G 04/2007
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@cdtechno.com
C&D Technologies, 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. The DATEL logo is a registered C&D Technologies, Inc. trademark.
D I G I T A L P A N E L M E T E R S
For updated, full-size data sheets visit: www.cd4power.com
MPM_78SR_G00 Page 5 of 5
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