7803SR [MURATA]

DC-DC Regulated Power Supply Module, 1 Output, Hybrid;


型号：	7803SR
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

+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

+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

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

6.8V

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

0.25

0.20

100% LOAD

50% LOAD

25% LOAD

100% LOAD

0.15

0.10

50% LOAD

0.05

25% LOAD

0.00

10 12 14 16 18 20 22 24 26 28 30 32 34 36

INPUT VOLTAGE

7805SR Efficiency

7805SR Input Current

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

100% LOAD

50% LOAD

100% LOAD

50% LOAD

25% LOAD

10 12 14 16 18 20 22 24 26 28 30 32 34 36

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

100% LOAD

50% LOAD

25% LOAD

50% LOAD

25% LOAD

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)

0.75

(19.1)

�

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.

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)

USA: Tucson (Az), Tel: (800) 547 2537, email: sales@cdtechno.com

Canada: Toronto, Tel: (866) 740 1232, email: toronto@cdtechno.com

United Kingdom: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@cdtechno.com

France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@cdtechno.com

Germany: München, Tel: +49 (0)89-544334-0, email: ped.munich@cdtechno.com

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

Japan: Tokyo, Tel: 3-3779-1031, email: sales_tokyo@cdtechno.com

Osaka, Tel: 6-6354-2025, email: sales_osaka@cdtechno.com

Website: www.cd4power.jp

www.cd4power.com

email: sales@cdtechno.com

China: Shanghai, Tel: +86 215 027 3678, email: shanghai@cdtechno.com

ISO 9001 REGISTERED

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

7803SR [MURATA]

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7803SRH-C

78040

780408

78041-0002

780417A

780418

78042FG

78043

78044F

78044H