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參數(shù)資料
| 型號(hào)： | 7812SR-C |
| 廠商： | MURATA POWER SOLUTIONS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 4.8 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, TO-220, SIP-3 |
| 文件頁(yè)數(shù)： | 1/6頁(yè) |
| 文件大小： | 435K |
| 代理商： | 7812SR-C |
78xxSR Series
3.3V/5V/12V Outputs High-Efciency
Switching Regulators with LM78xx Pinouts
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/dpm
www.murata-ps.com
email: sales@murata-ps.com
05 Apr 2011
MDC_78xxSR Series.B06 Page 1 of 6
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,
inefcient, 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 efciencies 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 signicant 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 Efciency 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.
MPS Part No.
Output
Input
Voltage
Current
Voltage
Standard Pin Package
7803SR-C
+3.3Vdc
0.5A
+7.5-36Vdc
7805SR-C
+5.0Vdc
0.5A
+7.5-36Vdc
7812SR-C
+12.0Vdc
0.4A
+15-36Vdc
Horizontal Pin Package
7803SRH-C
+3.3Vdc
0.5A
+7.5-36Vdc
7805SRH-C
+5.0Vdc
0.5A
+7.5-36Vdc
7812SRH-C
+12.0Vdc
0.4A
+15-36Vdc
Ordering Information
FEATURES
3.3V/0.5A, 5V/0.5A or 12V/0.4A outputs; Pin and
size-compatible with LM7805 & LM7812 regulators
Up to 95% efciency– no heat sinks or thermal
derating required
Two SIP-packages t 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 lter 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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 7812SRH-C | 1-OUTPUT 4.8 W DC-DC REG PWR SUPPLY MODULE |
| 7803SR-C | 1-OUTPUT 1.65 W DC-DC REG PWR SUPPLY MODULE |
| 7805SRH-C | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 7805SRH | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 7803SR | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 7812SRH | 制造商:Murata Power Solutions 功能描述:DC SW 0.5A 7.5V-36V TO 5V - Bulk 制造商:Murata Power Solutions 功能描述:DC/DC Power Supply Single-OUT 12V 0.4A 3-Pin SIP |
| 7812SRH-C | 功能描述:DC/DC轉(zhuǎn)換器 15-36Vin 12Vout 0.4A Switching Regulator RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| 7812UC | 制造商:Semiconductors 功能描述: |
| 7813 | 功能描述:端子 VERT .250X.032 HDRS RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp |
| 7813_10 | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:SMD 3 mm Square Sealed Rotary Switch |
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