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SMM205NR31 参数 Datasheet PDF下载

SMM205NR31图片预览
型号: SMM205NR31
PDF下载: 下载PDF文件 查看货源
内容描述: 双通道电源电压Marginer和有源直流输出控制器 [Dual Channel Supply Voltage Marginer and Active DC Output Controller]
分类和应用: 控制器
文件页数/大小: 20 页 / 900 K
品牌: SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
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SMM205  
Preliminary Information  
APPLICATIONS INFORMATION (CONTINUED)  
+12VIN (+10V to +15V)  
RTRIM(R3) is calculated as follows:  
VTRIMlow=0.3V, Regulator VREF=0.8V  
The current through R3 is ITRIM=(0.8-0.3)/RTRIM  
(ITRIM)(R4) > 15% of VOUT  
C4  
C7  
0.1uF  
0.01uF  
C8  
RTRIMmax should be < the calculated value  
0.1uF  
For Example:  
If Vout=3.3V, R4=63.4K, 15% of Vout=0.5V  
ITRIM=8uA, RTRIM=62.5K  
Therefore Rtrim standard 1% value down  
from 62.5K  
R6 10K  
R7 10K  
R8 10K  
C1 1uF  
U3  
START  
READY  
FAULT#  
3
5
18  
20  
14  
RTRIM  
R3  
START  
READY  
FAULT#  
TRIM_CAPA  
TRIMA  
VOUT  
11  
VMA  
U2 Switching Regulator  
17  
16  
15  
R4  
RSET1  
VMB  
TRIMB  
R2 10K  
R1 10K  
1
28  
6
SCL  
SDA  
A0  
TRIM_CAPB  
+Vin  
+Vout  
10  
SMM205 FILT_CAP  
4
A1  
A2  
PGOOD  
2
19  
12  
COMP1  
COMP2  
VADJ (VREF)  
C5  
0.02uF  
8
R5  
D1  
WP#  
20k  
DIODE  
START  
J1  
1
3
5
7
9
2
Gnd  
SCL  
SDA  
MR  
4
Gnd3  
Rsrv5  
6
8
+10V Rsrv8  
+5V Rsrv10  
10  
The SMM205 START pin must be inactive during power-up so  
that the TRIM pin is high impedence. Once power is nominal,  
the START pin can be active to start margin and ADOC  
functions  
SMX3200 I2C Programming  
Connector 10 pin Header  
R1 and R2 need only be  
placed once on the I2C bus  
Figure 7 – SMM205 Applications schematic for an adjustable switching regulator (Full regulator circuit not  
shown).  
Summit Microelectronics, Inc  
2069 1.4 6/23/03  
11