78SRH-5.2/2-C [MURATA]
民用设备,工业设备;
| 型号： | 78SRH-5.2/2-C |
| 厂家： | 
muRata |
| 描述： | 民用设备,工业设备 开关 控制器 开关式稳压器 开关式控制器 电源电路 开关式稳压器或控制器 |
| 文件： | 总5页 (文件大小：435K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
78SR 2 Amp Series
2 Amp, 3.3V & 5V Output, High Efficiency,
Synchronous Switching Regulators
Datel’s 78SR-3.3/2 (3.3V, 2 Amp output) and 78SR-5/2 (5V, 2 Amp output) step-down,
switching regulators are ultra high-efficiency, modern replacements for LM78xx series
1.5Amp linear regulators. They are pin- and size-compatible, drop-in replacements for
TO-220 style, 3-pin SIP or modular packages which require heat sinks. And, to ensure the
lowest installed cost, no messy thermal grease, no mounting hardware and no external
components are required for full operation.
FEATURES
N
Up to 95% efficiency–no costly heat sinks or fans
required
N
3.3V/2A & 5V/2A models; pin compatible with 1.5A 78xx
regulators
A 200KHz switching frequency, combined with a synchronous rectifier buck regulator
topology, provides for efficiencies exceeding 95%. 78SR switchers can easily drive 2A loads
from 12V or 24Vsupplies—at ambient temperatures up to +70°C—without heat sinks,
fans, or thermal derating. A thermally efficient 3-pin vertical mount SIP occupies less than
0.09in.2 (58mm2) of pc-board real estate, while a horizontal mount option has an installed
height of less than 0.290in. (7.4mm).
N
Wide 8–32Vdc input voltage range
N
Two package options:
3-pin vertical mount SIP
Low profile, horizontal mount SIP
N
No external Input/Output filter capacitors required
78SR Series 2A switching regulators are lower cost, improved-efficiency upgrades for
many 78HT2, 78SR1, 78ST1, and PT5100 series switchers. Their higher efficiency ensures
significantly lower heat generation and provides increased run time in battery-powered
applications, making these regulators ideal for today’s low power “green” applications.
N
–40 to +70°C full load operation at 24Vin with no
derating
N
Excellent load ( 0.25%) and line ( 0.35%) regulation
N
Low-cost upgrade for 78HT2, 78SR1, 78ST1, and
TECHNICAL NOTES
PT5100 switchers
N
Open frame design minimizes self-heating & pc-board
footprint
1. Input/Output (I/O) Filtering: As shown in the accompanying noise and ripple graphs,
78SR Series regulators exhibit excellent low noise performance with no additional I/O filter
components. 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 input voltage and ambient temperatures. Adding external output capacitors
will improve the unit’s load-transient response.
N
Includes output short-circuit protection and thermal
shutdown
N
Low noise output for powering sensitive instrumentation
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 potentially damaging
voltage transients at the regulator’s input terminals.
Ordering Information
Part No.
Output
Voltage
Output Input
Current Voltage
78SR-3.3/2-C
78SR-5/2-C
78SRH-3.3/2-C
78SRH-5/2-C
3.3Vdc
5.0Vdc
3.3Vdc
5.0Vdc
2.0A
2.0A
2.0A
2.0A
8.0-32Vdc
8.0-32Vdc
8.0-32Vdc
8.0-32Vdc
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
select an appropriate slow-blow fuse.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_78SR-2A_B01 Page 1 of 5
78SR 2 Amp Series
2 Amp, 3.3V & 5V Output, High Efficiency,
Synchronous Switching Regulators
TECHNICAL NOTES (continued)
Performance/Functional Specifications
Typical at TA = +25°C & VIN = 12V, unless otherwise noted
3. Input-Output Isolation: 78SR regulators’ internal input and output cir-
cuits share a common connection (GND, pin 2), there is no electrical
isolation between their INPUT (pin 1) and OUTPUT (pin 3) terminals.
Input/Output
Models
78SR-3.3/2
3.3Vdc
78SR-5/2
5.0Vdc
2.0A
Output Voltage
4. Overvoltage Protection: 78SR switching regulators do not provide
input or output overvoltage protection. In the extremely rare situation
where a catastrophic failure occurs, the output voltage may rise to
excessively high levels. If the load circuit must be protected against
all possible overvoltage situations, voltage-limiting circuitry must be
provided externally.
Rated Output Current
Output Voltage Accuracy
Input Voltage Range ~
Line Regulation (100% load)
Load Regulation (0-100% load)
Quiescent Current (mAdc)
Input Current vs. Input Voltage
Efficiency
2.0A
2%
2%
8.0-32Vdc
0.35%
8.0-32Vdc
0.35%
0.2%
0.2%
17 typ., 30 max
20 typ., 35max
5. Soldering & Handling Precautions: All units are designed to be hand
soldered to pc-boards, using lead-free no-clean solders (+260°C, 5
seconds max.). See the Mechanical Specifications section for pin 1
orientation and recommended pc-board hole dimensions.
See Efficiency Curves
See Efficiency Curves
See Performance Curves
See Performance Curves
Continuous
Transient Response
Input & Output Noise
Output Short Circuit Protection ~
Input/Output Isolation
Overvoltage Protection
Undervoltage Protection
Environmental
Models
78SR series regulators have limited built-in ESD protection; therefore
they should always be treated as ESD susceptible devices.
None
6. Horizontal-Pin Models (78SRH): 78SRH switching regulators are pin-
compatible replacements for TO-220 style LM78xx linear regulators
which are installed with their metal tabs or heat sinks laying flat on
the surface of the pc-board. In replacement applications, 78SRH units
must be soldered to the pc-board such that the insulating body of
diode D1 lies flat and in contact with the pc-board’s surface.
None
None
78SR-3.3/2
78SR-5/2
Operating Temperature
Storage Temperature
Cooling l
–40 to +70°C
–40 to +85°C
Free Air Convection
0 to 85%
Humidity (Non-condensing)
Physical
Mechanical
See Mechanical Specifications
Open-frame SIP
Package
Pins
0.025” (0.64mm) square,
tin-plated bronze
Weight
0.15 ounces (4.2g)
Pin Soldering
+260°C for 5 seconds
Absolute Maximum Ratings
Input Voltage:
Operating Temperature
Output Current
+36Vdc
+85°C
3.0 Amps
~ 78SR Series regulators can withstand a continuous short-circuit across their
output terminals. However, extended short-circuit operation will decrease the
unit’s long-term reliability.
These are stress ratings only; Exposure of devices to any of these conditions
may adversely affect long-term reliability. Proper operation under conditions
other than those listed in the Performance/Functional Specifications Table is not
implied.
l See derating chart for more information.
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_78SR-2A_B01 Page 2 of 5
78SR 2 Amp Series
2 Amp, 3.3V & 5V Output, High Efficiency,
Synchronous Switching Regulators
Typical Performance Curves TA = +25°C, VIN as indicated
Noise and Ripple - 10% and 100% Load, 20 MHz Bandwidth
78SR-3.3/2 Vin = 12V, ILOAD = 0.2A
78SR-3.3/2 Vin = 12V, ILOAD = 2.0A
78SR-3.3/2 Vin = 24V, ILOAD = 2.0A
78SR-5/2
Vin = 12V, ILOAD = 0.2A
78SR-5/2
Vin = 12V, ILOAD = 2.0A
78SR-5/2
Vin = 24V, ILOAD = 2.0A
Transient Response - 90% Load Step
78SR-3.3/2 10% to 100% Load Step
Vin = 12V
78SR-3.3/2 10% to 100% Load Step
78SR-3.3/2 100% to 10% Load Step
Vin = 12V
Vin = 24V
78SR-5/2 10% to 100% Load Step
Vin = 12V
78SR-5/2 100% to 10% Load Step
Vin = 12V
78SR-5/2 10% to 100% Load Step
Vin = 24V
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_78SR-2A_B01 Page 3 of 5
78SR 2 Amp Series
2 Amp, 3.3V & 5V Output, High Efficiency,
Synchronous Switching Regulators
78SR-5/2-C Input Current
78SR-3.3/2-C Input Current
1.0
0.8
0.6
0.4
0.2
0.0
1.0
2.0A LOAD
2.0A LOAD
0.8
0.6
1.0A LOAD
1.0A LOAD
0.4
0.5A LOAD
0.5A LOAD
0.2
0.0
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
INPUT VOLTAGE
INPUT VOLTAGE
78SR-3.3/2-C Efficiency
78SR-5/2-C Efficiency
100%
95%
90%
85%
80%
75%
70%
65%
60%
55%
100%
95%
90%
85%
80%
75%
70%
65%
60%
55%
Vin = 8V
Vin = 8V
Vin = 12V
Vin = 15V
Vin = 12V
Vin = 15V
Vin = 24V
Vin = 28V
Vin = 24V
Vin = 28V
Vin = 32V
Vin = 32V
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
LOAD CURRENT (AMPS)
LOAD CURRENT (AMPS)
Thermal Derating Curve
2.00
60ºC
65ºC
1.75
1.50
1.25
70ºC
8
12
15
24
28
32
36
INPUT VOLTAGE
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_78SR-2A_B01 Page 4 of 5
78SR 2 Amp Series
2 Amp, 3.3V & 5V Output, High Efficiency,
Synchronous Switching Regulators
MECHANICAL DIMENSIONS: Inches (mm)
TOLERANCES: 2 PL DEC 0.02 ( 0.51)
3 PL DEC 0.010 ( 0.254)
Standard Package
0.16
(4.1)
0.80
(20.3)
D1
ꢆꢇꢈ
L1
Pins: 0.025 (0.64) sq.
0.100 (2.54)
0.85
(21.6)
centers
PC-Board Hole:
0.037 - 0.043
(0.94 - 1.09) Dia.
$!4%, ꢀꢁ32ꢂꢃꢄꢅꢂ#
1
2
3
0.095
(2.4)
0.15
(3.8) Min.
0.23
(5.7)
Horizontal Package
(H Pin Option)
0.07
(1.8)
L1
L1
1
2
3
0.30 (7.6) min.
Pins: 0.025 (0.64) sq.
0.100 (2.54)
0.280
(7.1)
D1
centers
PC-Board Hole:
0.037 - 0.043
(0.94 - 1.09) Dia.
USA:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com
Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com
UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
Germany: München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 REGISTERED
Japan: Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
Website: www.murata-ps.jp
07/03/08
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
China:
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
notice.
© 2008 Murata Power Solutions, Inc.
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MPM_78SR-2A_B01 Page 5 of 5
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