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IQ65033QMA10ENS-G Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters

Part # IQ65033QMA10ENS-G
Description  Quarter-Brick ATCA Power Interface Module
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Manufacturer  SYNQOR [SynQor Worldwide Headquarters]
Direct Link  http://www.synqor.com
Logo SYNQOR - SynQor Worldwide Headquarters

IQ65033QMA10ENS-G Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters

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Input:
Outputs:
Current:
Package:
36-75 V
5.0 V/ 3.3 V
10 A
Quarter-brick
Product # IQ65033QMA10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-IQ5033S Rev. G
05/04/09
Page 11
Technical Specification
EXTERNAL HOLD-UP CAPACITOR SELECTION
CH is the hold-up capacitance (electrolytic capacitors typically
have a ±20% tolerance):
CH =
2tH PH
Equation A
H – V²U
Typically a strong function of V
H (see Figure D).
The ATCA specification requirement is 8.70ms (see Figure E).
Where:
V
H = hold-up capacitor charge voltage.
V
U = minimum operating voltage on the 48V output; the greater
of the under-voltage lockout threshold of the payload power
converter, and the under-voltage lockout threshold of the
management power converter.
t
H = time from when the highest input feed voltage drops below
VF
, to the time when the highest input feed voltage rises
above V
U.
VF
= voltage at which the hold-up capacitor is engaged.
P
H = power drawn from the hold-up capacitor, the sum of the input
power of the payload power converter, and the input power
of the 3.3V mgmt power converter (see Figure 9):
PH =
POUT 12V
+ PIN 3.3V
Equation B
η
12V
P
OUT12V = output power delivered by the payload converter.
η
12V = efficiency of the 12V payload converter.
P
IN.3.3V = 3.3V input management converter power.
EXTERNAL HOLD-UP CAPACITOR VOLTAGE RATING
Operating electrolytic capacitors near their voltage rating does
not significantly affect their reliability, as it does with tantalum
or ceramic type capacitors. The operating life of electrolytic
capacitors is primarily determined by the capacitor internal
temperature. The capacitor lifetime roughly doubles for every
10ºC reduction in internal temperature. SynQor recommends
running 100V rated electrolytic capacitors at 90V, which
dramatically increases hold-up time for a given capacitor volume
(see Figure D). A built-in circuit automatically discharges the
hold-up capacitor when the input voltage is removed.
0
5
10
15
20
300
400
500
600
700
800
900
1000
Hold-up Capacitance (µF)
90V
80V
70V
PH=200W
CF=100µF
VI=-43V
Figure D: Hold-up Time (ms) vs. Hold-up Capacitance (µF) at
Hold-up Charge Voltages of 70V, 80V, and 90V (see Equation A).
The AdvancedTCA hold-up time requirement is at most 8.70ms (solid
horizontal line). The capacitor tolerance is not factored into this result.
Error bars indicate the worst case range of hold-up time for a given
hold-up capacitance.
36.0V
43.0V
41.0V
0
10
20
30
40
50
60
70
80
90
100
0
1
2
3
4
5
6
7
8
9
10
Time (ms)
8.70ms
Figure E: The PICMG 3.0 R2.0 AdvancedTCA Base Specification
requires continuous operation through a zero-volt transient, lasting 5ms
(Section 4.1.2.2). However, this is not a square wave: the voltage starts
at a minimum amplitude of -43V, falls at 50V/ms, remains at 0V for
5ms, and then rises at 12.5V/ms. At the worst case values of the hold-up
connect threshold and the management power under-voltage lockout
threshold, the required hold-up time is 8.70ms.


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