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ADDC02803SCTV

更新时间: 2024-10-27 22:39:03
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页数 文件大小 规格书
18页 244K
描述
28 V/66 W/100 W DC/DC Converters with Integral EMI Filter

ADDC02803SCTV 数据手册

 浏览型号ADDC02803SCTV的Datasheet PDF文件第5页浏览型号ADDC02803SCTV的Datasheet PDF文件第6页浏览型号ADDC02803SCTV的Datasheet PDF文件第7页浏览型号ADDC02803SCTV的Datasheet PDF文件第9页浏览型号ADDC02803SCTV的Datasheet PDF文件第10页浏览型号ADDC02803SCTV的Datasheet PDF文件第11页 
ADDC02803SC/ADDC02805SA  
BASIC OPERATION  
one of the output pins of the converter, or remotely at the load.  
A remote connection at the load can adjust for voltage drops of  
as much as 0.25 V dc between the converter and the load.  
The ADDC02803SC and ADDC02805SA converters use a  
flyback topology with dual interleaved power trains operating  
180° out of phase. Each power train switches at a fixed fre-  
quency of 500 kHz, resulting in a 1 MHz fixed switching fre-  
quency as seen at the input and output of the converter. In a  
flyback topology, energy is stored in the inductor during one  
half portion of the switching cycle and is then transferred to the  
output filter during the next half portion. With two interleaved  
power trains, energy is transferred to the output filter during  
both halves of the switching cycle, resulting in smaller filters to  
meet the required ripple.  
Long remote sense leads can affect converter stability, although  
this condition is rare. The impedance of the long power leads  
between the converter and the remote sense point could affect  
the converter’s unity gain crossover frequency and phase margin.  
Consult factory if long remote sense leads are to be used.  
Pin 3 (ADJUST)  
An adjustment pin is provided so that the user can change the  
nominal output voltage during the prototype stage. Since very  
low temperature coefficient resistors are used to set the output  
voltage and maintain tight regulation over temperature, using  
standard external resistors to adjust the output voltage will  
loosen output regulation over temperature. Furthermore, since  
the status trip point is not changed when the output voltage is  
adjusted using external resistors, the status line will no longer  
trip at the standard levels of the newly adjusted output voltage.  
If necessary, modified standard units can be ordered with the  
necessary changes made inside the package at the factory. The  
ADJUST function is sensitive to noise, and care should be taken  
in the routing of connections.  
A five pole differential input EMI filter, along with a common-  
mode EMI capacitor and careful attention to layout parasitics, is  
designed to meet all applicable requirements in MIL-STD-461D  
when installed in a typical system setup. A more detailed dis-  
cussion of CE102 and other EMI issues is included in the sec-  
tion entitled EMI Considerations.  
The converters use current mode control and employ a high  
performance opto-isolator in its feedback path to maintain  
isolation between input and output. The control circuit is  
designed to give a nearly constant output current as the output  
voltage drops from VO nom to VSC during a short circuit  
condition. It does not let the current fold back below the  
maximum rated output current. The output overvoltage  
protection circuitry, which is independent of the normal  
feedback loop, protects the load against a break in the remote  
sense leads. Remote sense connections, which can be made at  
the load, can adjust for voltage drops of as much as 0.25 V dc  
between the converter and the load, thereby maintaining an  
accurate voltage level at the load.  
To make the output voltage higher, place a resistor from  
ADJUST (Pin 3) to –SENSE (Pin 1). To make the output  
voltage lower, place a resistor from ADJUST (Pin 3) to +SENSE  
(Pin 2). Figures 24 and 25 show resistor values for a ±5% change  
in output voltage:  
8
7
6
5
4
3
2
1
An input overvoltage protection feature shuts down the con-  
verter when the input voltage exceeds (nominally) 52.5 V dc.  
An internal temperature sensor shuts down the unit and pre-  
vents it from becoming too hot if the heat removal system fails.  
The temperature sensed is the case temperature and is factory  
set to trip at a nominal case temperature of 110°C to 115°C.  
The shutdown temperature setting can be raised externally or  
disabled by the user.  
Each unit has an INHIBIT pin that can be used to turn off the  
converter. This feature can be used to sequence the turn-on of  
multiple converters and to reduce input power draw during  
extended time in a no load condition.  
99  
98  
97  
96  
95  
OUTPUT VOLTAGE – %  
Figure 24. External Resistor Value for Reducing Output  
Voltage  
A SYNC pin, referenced to the input return line (Pin 10),  
is available to synchronize multiple units to one switching  
frequency. This feature is particularly useful in eliminating  
beat frequencies which may cause increased output ripple on  
paralleled units. A current share pin (ISHARE) is available that  
permits paralleled units to share current typically within 5% at  
full load.  
5
4
3
2
A low level dc auxiliary voltage supply referenced to the input  
return line is provided for miscellaneous system use.  
PIN CONNECTIONS  
Pins 1 and 2 (؎SENSE)  
1
0
Pins 1 and 2 must always be connected for proper operation,  
although failure to make these connections will not be catastrophic  
to the converter under normal operating conditions. Pin 1 must  
always be connected to the output return and Pin 2 must always  
be connected to +VOUT. These connections can be made at any  
101  
102  
103  
104  
105  
OUTPUT VOLTAGE – %  
Figure 25. External Resistor for Increasing Output Voltage  
REV. A  
–8–  

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