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7812SR-C PDF预览

7812SR-C

更新时间: 2024-02-14 08:01:14
品牌 Logo 应用领域
村田 - MURATA 开关
页数 文件大小 规格书
6页 399K
描述
3.3V/5V/12V Outputs High-Effi ciency Switching Regulators with LM78xx Pinouts

7812SR-C 技术参数

生命周期:Obsolete零件包装代码:SFM
包装说明:,针数:3
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.67
JESD-30 代码:R-XSFM-T3功能数量:1
端子数量:3工作温度TJ-Max:125 °C
工作温度TJ-Min:最大输出电流 1:1 A
标称输出电压 1:12 V封装主体材料:UNSPECIFIED
封装形状:RECTANGULAR封装形式:FLANGE MOUNT
认证状态:Not Qualified调节器类型:FIXED POSITIVE SINGLE OUTPUT STANDARD REGULATOR
表面贴装:NO技术:BIPOLAR
端子形式:THROUGH-HOLE端子位置:SINGLE
Base Number Matches:1

7812SR-C 数据手册

 浏览型号7812SR-C的Datasheet PDF文件第2页浏览型号7812SR-C的Datasheet PDF文件第3页浏览型号7812SR-C的Datasheet PDF文件第4页浏览型号7812SR-C的Datasheet PDF文件第5页浏览型号7812SR-C的Datasheet PDF文件第6页 
78xxSR Series  
s
3.3V/5V/12V Outputs High-Efficiency  
Switching Regulators with LM78xx Pinouts  
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,  
inefficient, 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 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% efficiencyno 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 capacitorsno external components  
required  
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.  
   
–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  
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 Efficiency Curves as a  
guide to selecting an appropriate slow-blow fuse.  
   
Can be used with unregulated dc supplies  
protection  
Ordering Information  
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  
Voltage  
Output Input  
Current Voltage  
Standard Pin Package  
7803SR-C  
7805SR-C  
+3.3Vdc  
+5.0Vdc  
0.5A  
0.5A  
+7.5-36Vdc  
+7.5-36Vdc  
+15-36Vdc  
7812SR-C  
+12.0Vdc 0.4A  
Horizontal Pin Package  
7803SRH-C  
7805SRH-C  
7812SRH-C  
+3.3Vdc  
+5.0Vdc  
0.5A  
0.5A  
+7.5-36Vdc  
+7.5-36Vdc  
+15-36Vdc  
+12.0Vdc 0.4A  
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  
MDC_78xxSR Series.B03 Page 1 of 6  

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