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CS52015-3GST3 参数 Datasheet PDF下载

CS52015-3GST3图片预览
型号: CS52015-3GST3
PDF下载: 下载PDF文件 查看货源
内容描述: 1.5A , 3.3V固定线性稳压器 [1.5A, 3.3V Fixed Linear Regulator]
分类和应用: 线性稳压器IC调节器电源电路光电二极管输出元件
文件页数/大小: 6 页 / 163 K
品牌: CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
 浏览型号CS52015-3GST3的Datasheet PDF文件第1页浏览型号CS52015-3GST3的Datasheet PDF文件第2页浏览型号CS52015-3GST3的Datasheet PDF文件第3页浏览型号CS52015-3GST3的Datasheet PDF文件第5页浏览型号CS52015-3GST3的Datasheet PDF文件第6页  
Typical Performance Characteristics  
0.100  
200  
0.075  
100  
0
C
=C =22mF Tantalum  
IN  
-100  
-200  
0.050  
0.025  
OUT  
T
= 125°C  
CASE  
T
= 25°C  
CASE  
1500  
750  
0
T
= 0°C  
CASE  
0.000  
0
1
2
0
1
2
3
4
5
6
7
8
9
10  
Output Current (A)  
Time mS  
Transient Response  
Load Regulation vs. Output Current  
Applications Information  
The CS52015-3 linear regulator provides a 3.3V output  
voltage at currents up to 1.5A. The regulator is protected  
against overcurrent conditions and includes thermal  
shutdown.  
Protection Diodes  
When large external capacitors are used with a linear regu-  
lator it is sometimes necessary to add protection diodes. If  
the input voltage of the regulator gets shorted, the output  
capacitor will discharge into the output of the regulator.  
The discharge current depends on the value of the capaci-  
tor, the output voltage and the rate at which VIN drops. In  
the CS52015-3 linear regulator, the discharge path is  
through a large junction and protection diodes are not usu-  
ally needed. If the regulator is used with large values of  
output capacitance and the input voltage is instantaneous-  
ly shorted to ground, damage can occur. In this case, a  
diode connected as shown in Figure 1 is recommended.  
The CS52015-3 has a composite PNP-NPN output transistor  
and requires an output capacitor for stability. A detailed  
procedure for selecting this capacitor is included in the  
Stability Considerations section.  
Stability Considerations  
The output or compensation capacitor helps determine  
three main characteristics of a linear regulator: start-up  
delay, load transient response and loop stability.  
The capacitor value and type are based on cost, availabili-  
ty, size and temperature constraints. A tantalum or alu-  
minum electrolytic capacitor is best, since a film or ceramic  
capacitor with almost zero ESR can cause instability. The  
aluminum electrolytic capacitor is the least expensive solu-  
tion. However, when the circuit operates at low tempera-  
tures, both the value and ESR of the capacitor will vary  
considerably. The capacitor manufacturersÕ data sheet pro-  
vides this information.  
IN4002  
(optional)  
VOUT  
VIN  
VOUT  
VIN  
C1  
CS52015-3  
C2  
Gnd  
A 22µF tantalum capacitor will work for most applications,  
but with high current regulators such as the CS52015-3 the  
transient response and stability improve with higher val-  
ues of capacitance. The majority of applications for this  
regulator involve large changes in load current so the out-  
put capacitor must supply the instantaneous load current.  
The ESR of the output capacitor causes an immediate drop  
in output voltage given by:  
Figure 1: Protection diode scheme for large output capacitors.  
Output Voltage Sensing  
ÆV = ÆI ´ ESR  
For microprocessor applications it is customary to use an  
output capacitor network consisting of several tantalum and  
ceramic capacitors in parallel. This reduces the overall ESR  
and reduces the instantaneous output voltage drop under  
load transient conditions. The output capacitor network  
should be as close as possible to the load for the best results.  
Since the CS52015-3 is a three terminal regulator, it is not  
possible to provide true remote load sensing. Load regula-  
tion is limited by the resistance of the conductors connect-  
ing the regulator to the load. For best results the regulator  
should be connected as shown in Figure 2.  
4