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MOR286R3DV 参数 Datasheet PDF下载

MOR286R3DV图片预览
型号: MOR286R3DV
PDF下载: 下载PDF文件 查看货源
内容描述: 铁道部单路和双路DC / DC转换器 [MOR Single and Dual DC/DC Converters]
分类和应用: 转换器输出元件
文件页数/大小: 21 页 / 617 K
品牌: CRANE [ Crane Aerospace & Electronics. ]
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Crane Aerospace & Electronics Power Solutions  
MOR Single and Dual DC/DC Converters  
28 VOLT INPUT – 120 WATT  
TRIM FORMULAS  
HOW TO USE FUNCTIONS  
Trim Up:  
V
POSITIVE INPUT AND INPUT COMMON  
o
α
=
, 1.0 ≤ α ≤ 1.1  
V
Steady state voltage range is 16 to 40 VDC. Transient range is 40  
to 50 V for a maximum of 120 msec. Low voltage lockout prevents  
the units from operating below approximately 15.5 VDC input  
voltage to keep system current levels smooth, especially during  
initialization or re-start operations. All models include a soft-start  
function to prevent large current draw and minimize overshhoot.  
o nominal  
V
o
(
– 1 • 20  
)
2.5  
R (kΩ) =  
T
– 50  
(α -1)  
Example:  
CASE AND EXTERNAL INPUT FILTERS  
Internal 500 V capacitors are connected between the case and  
input common and between the case and output common. See  
Figure 3.  
V
= 5.0, V = 5.25, α = 1.05, R = 390 kΩ  
o nominal  
o
T
Trim Down:  
V
o
α
=
, 0.6 ≤ α ≤ 1.0  
1, 2, 3  
V
10, 11, 12  
1
o nominal  
Positive Input  
Positive Output  
Positive Input  
MOR  
FME28-461  
EMI Filter  
Single or Dual  
Output  
28V  
50 • α – 30  
1 – α  
R (kΩ) =  
T
4, 5, 6  
Input Common  
7, 8, 9  
2
Input Common  
Output Common  
Example: V  
= 5.0,V = 4.5, α = 0.9, R = 150 kΩ  
o nominal  
o
T
Case  
Chassis Ground  
INHIBIT 1 AND 2  
Two inhibit terminals disable switching, resulting in no output and  
FIGURE 3: EXTERNAL FILTER CONNECTION  
very low quiescent  
input current. The  
two inhibit pins allow  
access to an inhibit  
function on either  
side of the isolation  
barrier to help main-  
tain isolation.  
Positive  
Input  
Interpoint’s FME filters are recommended to meet CE03 require-  
ments for reflected input line current. When using an external input  
filter it is important that the case of the filter and the case of the  
converter be connected through as low as an impedance as  
possible. Direct connection of the baseplates to chassis ground is  
the best connection. If connected by a single trace, the trace should  
be as wide as it is long.  
Inhibit 1  
VCC  
Input  
Common  
MOR Input Side  
An open collector is  
required for inter-  
facing with both of  
TRIM  
FIGURE 6: INHIBIT – INPUT SIDE  
Both single and dual output models include a trim function. Output  
voltage can be trimmed from 60% up to 110% of nominal V out .  
When trimming up, do not exceed the maximum output power.  
When trimming down, do not exceed the maximum output current.  
See Figure 4.  
the inhibit pins. Applying an open-collector TTL logic low to either  
inhibit pin will inhibit the  
converter. Applying an  
open collector TTL logic  
high or leaving the pins  
open will enable the  
VS  
~
~
Voltage  
E/A  
Current  
Limit  
On dual models the positive output is regulated and the negative  
output is transformer coupled (cross-regulated) to the positive  
output. When trimming the duals, both output voltages will be  
adjusted equally. See Figure 5.  
converter. Inhibit  
1
is  
referenced  
to  
Input  
Feedback  
Common, while Inhibit 2  
is referenced to Sense  
Return on the output side.  
Inhibit 2  
Sense  
Return  
Trim  
3
RT  
7
10  
Trim  
RT  
10  
MOR Output Side  
TRIM UP  
TRIM UP  
7
8
Positive Output  
Positive Sense  
Positive Output  
The open circuit voltage  
for Inhibit 1 is 13 V and for  
MOR  
Single  
Output  
FIGURE 7: INHIBIT – OUTPUT SIDE  
MOR  
Dual  
Output Common  
Output  
TRIM DOWN  
9
8
Inhibit 2 it is 8 V. Float the inhibit pin(s) if not used. The required  
logic low voltage level is 0.2 V maximum.  
Sense Return  
Output Common  
9
Negative Output  
TRIM  
DOWN  
FIGURE 4: TRIM – SINGLE  
FIGURE 5: TRIM – DUAL  
See Figures 6 and 7.  
www.craneae.com  
Page 4 of 21  
Rev G - 20060418  
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