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CA3274

更新时间： 2024-02-29 21:30:00
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英特矽尔 - INTERSIL 开关电源开关
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5页 30K
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Current Limiting Power Switch with Current Limiter Sense Flag

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CA3274 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Contact Manufacturer包装说明：,
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.8
Is Samacsys：N内置保护：OVER CURRENT
接口集成电路类型：BUFFER OR INVERTER BASED PERIPHERAL DRIVERJESD-30 代码：R-PDIP-T8
JESD-609代码：e0功能数量：1
端子数量：8最高工作温度：85 °C
最低工作温度：-40 °C输出电流流向：SOURCE
标称输出峰值电流：0.2 A封装主体材料：PLASTIC/EPOXY
封装形状：RECTANGULAR封装形式：IN-LINE
峰值回流温度（摄氏度）：NOT SPECIFIED认证状态：Not Qualified
最大供电电压：10 V最小供电电压：7 V
表面贴装：NO温度等级：INDUSTRIAL
端子面层：TIN LEAD端子形式：THROUGH-HOLE
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
Base Number Matches：1

CA3274 数据手册

 浏览型号CA3274的Datasheet PDF文件第2页浏览型号CA3274的Datasheet PDF文件第3页浏览型号CA3274的Datasheet PDF文件第4页浏览型号CA3274的Datasheet PDF文件第5页 
CA3274  
Current Limiting Power Switch  
with Current Limiter Sense Flag  
April 1994  
Features  
Description  
• Drive-Current Limiting at Output  
• Current-Sense Buffer and Reference  
• 200mA Driver Current Capability  
• Logic-Level Control Input  
The CA3274 is a controlled current switch and may be used in  
general purpose switching applications that require specified  
maximum levels of current. The functional block diagram of  
the CA3274 is shown and a typical application circuit is shown  
in Figure 1. An internal emitter follower has 200mA of source  
drive output capability. The Control Input is a Schmitt trigger  
buffer amplifier for noise immunity in the environments typical  
of industrial and automotive control systems.  
• Current Limiting Flag Output  
• 50dB Minimum PSRR  
Current sensing in the emitter circuit of a power-darlington  
output stage is fed back from a sampling resistor to the sense  
input of the CA3274 which has a 335mV typical offset. For the  
example shown in Figure 1, a sampling resistor of 0.056Ω  
permits 6.0A (0.335/0.056) of current in the emitter of the output  
driver. When the current limiter is activated, the flag output  
changes state conditionally. If the control input is the “0” state,  
the flag output will remain in a “1” state. If the control input is in  
the “1” state and the sense input is less than the voltage  
reference level of 335mV, the flag output will remain in the “1”  
state. If the control input is the “1” state and the sense input is  
equal to or greater than the 335mV reference level, the flag  
output goes to the “0” state. The output flag switch may be used  
to accurately establish dwell timing in automotive applications.  
When the control input goes to “0”, the flag is reset to “1”. Noise-  
immunity hold-off is used to prevent pre-triggering of the flag  
output and is noted as tD in the timing diagram of Figure 2.  
• 5µs Typical Switch Time  
• Separate Signal and Power Grounds  
Applications  
• Solenoid Switch Driver  
• Relay Driver  
• Lamp Control Switch  
• Ignition Coil Pre-Driver  
• Constant Current Driver  
• Current Limiting Switch  
• Fault Output Sense Appliance  
• Power Supply Fault Mode Control  
The flag output may be used for diagnostic feedback via the  
current sense input to detect a fault mode. In this case the  
sampled drive current is either from the emitter of the CA3274  
internal power transistor or an external output amplifier, such as  
a darlington power transistor or power-FET output stage. The  
CA3274 has separate power and signal grounds to minimize  
transient-loop feedback to the input ground and thus prevent  
false triggering of the output. Optionally, the output from the  
CA3274 may be taken from the open collector (DRIVE IN) at  
pin 6. An external resistor at pin 6 may be used to set the level  
at which Q2 will saturate, providing additional limiting protection  
for the maximum forward-drive from the CA3274.  
Ordering Information  
TEMPERATURE  
PART NUMBER  
RANGE  
PACKAGE  
o
o
CA3274E  
-40 C to +85 C  
8 Lead Plastic DIP  
Pinout  
CA3274 (PDIP)  
TOP VIEW  
FLAG OUT  
SENSE IN  
1
2
3
4
8
7
6
5
VCC SUPPLY  
CONTROL IN  
DRIVE IN  
POWER GND  
SIGNAL GND  
DRIVE OUT  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
File Number 2222.2  
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 199190-40  
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