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PQ60018QTA40NKS 参数 Datasheet PDF下载

PQ60018QTA40NKS图片预览
型号: PQ60018QTA40NKS
PDF下载: 下载PDF文件 查看货源
内容描述: 四分之一砖DC / DC转换器 [Quarter-brick DC/DC Converter]
分类和应用: 转换器
文件页数/大小: 13 页 / 484 K
品牌: SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
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Input:  
Output:  
35-75 V  
1.8 V  
Current:  
Package:  
40 A  
Quarter-brick  
Technical Specification  
across the output (pins 8 and 4) to determine when it should trig-  
ger, not the voltage across the converter’s sense leads (pins 7  
and 5). Therefore, the resistive drop on the board should be  
small enough so that output OVP does not trigger, even during  
load transients.  
output over-voltage protection circuit is triggered. Trimming the  
output voltage too high may cause the over-voltage protection cir-  
cuit to engage, particularly during transients.  
It is not necessary for the user to add capacitance at the Trim pin.  
The node is internally bypassed to eliminate noise.  
OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits the  
user to adjust the output voltage across the sense leads up or  
down according to the trim range specifications.  
Total DC Variation of Vout: For the converter to meet its full  
specifications, the maximum variation of the DC value of Vout,  
due to both trimming and remote load voltage drops, should not  
be greater than that specified for the output voltage trim range.  
To decrease the output voltage, the user should connect a resistor  
between Pin 6 and Pin 5 (SENSE(-) input). For a desired decrease  
of the nominal output voltage, the value of the resistor should be  
PROTECTION FEATURES  
511  
R
=
- 10.22 (k)  
trim-down  
( %)  
Input Under-Voltage Lockout: The converter is designed to  
turn off when the input voltage is too low, helping avoid an input  
system instability problem, described in more detail in the appli-  
cation note titled “Input System Instability”. The lockout circuitry  
is a comparator with DC hysteresis. When the input voltage is ris-  
ing, it must exceed the typical Turn-On Voltage Threshold value  
(listed on the specification page) before the converter will turn  
on. Once the converter is on, the input voltage must fall below  
the typical Turn-Off Voltage Threshold value before the converter  
will turn off.  
where  
Vnominal – Vdesired  
Vnominal  
=
x 100%  
∆%  
To increase the output voltage, the user should connect a resistor  
between Pin 6 and Pin 7 (SENSE(+) input). For a desired increase  
of the nominal output voltage, the value of the resistor should be  
5.11VOUT(100+%)  
1.225%  
511  
_
_
R
=
trim-up  
where  
(k)  
10.22  
Output Current Limit: The maximum current limit remains con-  
stant as the output voltage drops. However, once the impedance  
of the short across the output is small enough to make the output  
voltage drop below the specified Output DC Current-Limit  
Shutdown Voltage, the converter turns off.  
)
(
%  
V
= Nominal Output Voltage  
OUT  
Figure C graphs the relationship between the trim resistor value  
and Rtrim-up and Rtrim-down, showing the total range the output  
voltage can be trimmed up or down.  
The converter then enters a “hiccup mode” where it repeatedly  
turns on and off at a 5 Hz (nominal) frequency with a 5% duty  
cycle until the short circuit condition is removed. This prevents  
excessive heating of the converter or the load board.  
10,000  
1,000  
100  
Output Over-Voltage Limit: If the voltage across the output  
pins exceeds the Output Over-Voltage Protection threshold, the  
converter will immediately stop switching. This prevents damage  
to the load circuit due to 1) excessive series resistance in output  
current path from converter output pins to sense point, 2) a  
release of a short-circuit condition, or 3) a release of a current  
limit condition. Load capacitance determines exactly how high  
the output voltage will rise in response to these conditions. After  
200 ms the converter will automatically restart.  
10  
Over-Temperature Shutdown: A temperature sensor on the  
converter senses the average temperature of the module. The  
thermal shutdown circuit is designed to turn the converter off  
when the temperature at the sensed location reaches the Over-  
Temperature Shutdown value. It will allow the converter to turn on  
again when the temperature of the sensed location falls by the  
0
2
4
6
8
10  
12  
14  
16  
18  
20  
% increase Vout  
% decrease Vout  
Figure C: Trim Graph for 1.8Vout module  
Note: the TRIM feature does not affect the voltage at which the  
Product # PQ60018QTA40  
Phone 1-888-567-9596  
www.synqor.com  
Doc.# 005-2QT618C Rev. C  
09/08/05  
Page 10