파트넘버.co.kr 78SR-3.3 데이터시트 PDF


78SR-3.3 반도체 회로 부품 판매점

Synchronous Switching Regulators



Murata 로고
Murata
78SR-3.3 데이터시트, 핀배열, 회로
www.murata-ps.com
78SR 2 Amp Series
2 Amp, 3.3V & 5V Output, High Efficiency,
Synchronous Switching Regulators
FEATURES
Up to 95% efficiency– no costly heat sinks or fans
required
3.3V/2A & 5V/2A models; pin compatible with 1.5A 78xx
regulators
Wide 8– 32Vdc input voltage range
Two package options:
3-pin vertical mount SIP
Low profile, horizontal mount SIP
No external Input/Output filter capacitors required
–40 to +70°C full load operation at 24Vin with no
derating
Excellent load (±0.25%) and line (±0.35%) regulation
Low-cost upgrade for 78HT2, 78SR1, 78ST1, and
PT5100 switchers
Open frame design minimizes self-heating & pc-board
footprint
Includes output short-circuit protection and thermal
shutdown
Low noise output for powering sensitive instrumentation
Ordering Information
Part No.
Output
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
Output
Current
2.0A
2.0A
2.0A
2.0A
Input
Voltage
8.0-32Vdc
8.0-32Vdc
8.0-32Vdc
8.0-32Vdc
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.
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).
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.
TECHNICAL NOTES
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.
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.
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/dpm
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_78SR-2A_B02 Page 1 of 5


78SR-3.3 데이터시트, 핀배열, 회로
Performance/Functional Specifications
Typical at TA = +25°C & VIN = 12V, unless otherwise noted
Input/Output
Models
Output Voltage
Rated Output Current
Output Voltage Accuracy
Input Voltage Range ➀ ➁
Line Regulation (100% load)
Load Regulation (0-100% load)
Quiescent Current (mAdc)
Input Current vs. Input Voltage
Efficiency
Transient Response
Input & Output Noise
Output Short Circuit Protection
Input/Output Isolation
Overvoltage Protection
Undervoltage Protection
Environmental
Models
Operating Temperature
Storage Temperature
Cooling
Humidity (Non-condensing)
Physical
Mechanical
Package
Pins
Weight
Pin Soldering
78SR-3.3/2
78SR-5/2
3.3Vdc
5.0Vdc
2.0A 2.0A
±2% ±2%
8.0-32Vdc
8.0-32Vdc
±0.35%
±0.35%
±0.2%
±0.2%
25 typ., 30 max
20 typ., 35max
See Efficiency Curves
See Efficiency Curves
See Performance Curves
See Performance Curves
Continuous
None
None
None
78SR-3.3/2
78SR-5/2
–40 to +70°C
–40 to +85°C
Free Air Convection
0 to 85%
See Mechanical Specifications
Open-frame SIP
0.025” (0.64mm) square,
tin-plated bronze
0.15 ounces (4.2g)
+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.
See derating chart for more information.
78SR 2 Amp Series
2 Amp, 3.3V & 5V Output, High Efficiency,
Synchronous Switching Regulators
TECHNICAL NOTES (continued)
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.
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.
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.
78SR series regulators have limited built-in ESD protection; therefore
they should always be treated as ESD susceptible devices.
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.
www.murata-ps.com/dpm
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_78SR-2A_B02 Page 2 of 5




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