欢迎访问ic37.com |
会员登录 免费注册
发布采购

OPA552UA 参数 Datasheet PDF下载

OPA552UA图片预览
型号: OPA552UA
PDF下载: 下载PDF文件 查看货源
内容描述: 高电压,大电流运算放大器 [High-Voltage, High-Current OPERATIONAL AMPLIFIERS]
分类和应用: 运算放大器放大器电路光电二极管
文件页数/大小: 24 页 / 1019 K
品牌: TI [ TEXAS INSTRUMENTS ]
 浏览型号OPA552UA的Datasheet PDF文件第5页浏览型号OPA552UA的Datasheet PDF文件第6页浏览型号OPA552UA的Datasheet PDF文件第7页浏览型号OPA552UA的Datasheet PDF文件第8页浏览型号OPA552UA的Datasheet PDF文件第10页浏览型号OPA552UA的Datasheet PDF文件第11页浏览型号OPA552UA的Datasheet PDF文件第12页浏览型号OPA552UA的Datasheet PDF文件第13页  
CURRENT LIMIT  
APPLICATIONS INFORMATION  
The OPA551 and OPA552 are designed with internal cur-  
rent-limiting circuitry that limits the output current to ap-  
proximately 380mA. The current limit varies with increasing  
junction temperature as shown in the typical curve “Current  
Limit vs Temperature.” This, in combination with the ther-  
mal protection circuitry, provides protection from many  
types of overload conditions including short circuit to ground.  
Figure 1 shows the OPA551 connected as a basic non-  
inverting amplifier. The OPA551 can be used in virtually  
any op amp configuration. OPA552 is designed for use in  
configurations with gains of 5 or greater. Power supply  
terminals should be bypassed with 0.1µF capacitors, or  
greater, near the power supply pins. Be sure that the capaci-  
tors are appropriately rated for the power supply voltage  
used. The OPA551 and OPA552 can supply output currents  
up to 200mA with excellent performance.  
THERMAL PROTECTION  
The OPA551 and OPA552 have thermal shutdown circuitry  
that protects the amplifier from damage caused by overload  
conditions. The thermal protection circuitry disables the  
output when the junction temperature reaches approximately  
160°C, allowing the device to cool. When the junction  
temperature cools to approximately 140°C, the output cir-  
cuitry is automatically re-enabled.  
V+  
10µF  
R2  
G = 1+  
+
R1  
0.1µF  
R2  
R1  
The thermal shutdown function is not intended to replace  
proper heat sinking. Activation of the thermal shutdown  
circuitry is an indication of excessive power dissipation or  
an inadequate heat sink. Continuously running the amplifier  
into thermal shutdown can degrade reliability.  
VO  
OPA551  
ZL  
VIN  
Flag  
(optional)  
The Thermal Shutdown Indicator (“flag”) pin can be moni-  
tored to determine if shutdown is occurring. During normal  
operation, the current output from the flag pin is typically  
50nA. During shutdown, the current output from the flag pin  
increases to 120µA (typical). This current output allows for  
easy interfacing to external logic. See Figure 2 for two  
examples implementing this function.  
0.1µF  
10µF  
+
V–  
FIGURE 1. Basic Circuit Connections.  
VOUT  
VOUT  
OPA551  
OPA551  
VLOGIC  
HP5082-2835  
Flag  
80µA to  
160µA  
+5V  
Interface to virtually any CMOS  
logic gate by choosing resistor  
value that provides a guaranteed  
logic high voltage with the  
minimum (80µA) flag current. A  
diode clamp to the logic supply  
voltage assures that the CMOS  
is not damaged by overdrive.  
HCT logic has relatively well-  
controlled logic level. A properly  
chosen resistor value can  
guarantee proper logic high level  
throughout the full range of flag  
output current.  
HCT  
CMOS  
27kΩ  
47kΩ  
Logic  
Ground  
Logic  
Ground  
Interfacing with HCT Logic  
Interfacing with CMOS Logic  
FIGURE 2. Thermal Shutdown Indicator.  
OPA551, OPA552  
9
SBOS100A  
www.ti.com