ALT Series Technical Reference Note
ALT Isolated DC/DC Converter Module
Industry Standard Size: 36-75V Input, ±12V,
5V double Output
Features
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2”X 1.6’’package
Basic isolation
High efficiency
High power density
2:1 wide input of 36-75V
CNT function
Trim function
Input under-voltage lockout
Output short circuit protection
Output over-voltage protection
Wide operating case temperature range
Industry Standard Size: 2”X 1.6’’package
Options
Choice of positive logic or negative logic for CNT function
Choice of short pins or long pins
Description
The ALT series is a new open frame DC-DC converter. It is one of the most cost effective
options available in component power. The ALT series uses an industry standard package
size: 50.8mm X 40.6mm X 9.66mm (2”x1.6”x0.38”) and standard pin-out configuration,
provides CNT and trim functions.
ALT series comes in 48V input versions, each of which uses a 2:1 input range of 36~75V.
The series can provide
12V@1.25A and
5V@3A double outputs, outputs are isolated
from input. And the converters are capable of providing up to 30 watts of output power.
DATE: Feb. 18, 2003
MODEL : ALT Series
S 1 / 25
ALT Series Technical Reference Note
Contents
O
PTIONS
.................................................................................................................................................................1
D
ESCRIPTION
..........................................................................................................................................................1
ELECTRICAL SPECIFICATIONS........................................................................................................................4
I
NPUT
S
PECIFICATIONS
............................................................................................................................................4
A
BSOLUTE
M
AXIMUM
R
ATINGS
..............................................................................................................................5
O
UTPUT
S
PECIFICATIONS
........................................................................................................................................6
O
UTPUT
S
PECIFICATIONS
(C
ONT
) ............................................................................................................................7
F
EATURE
S
PECIFICATIONS
.......................................................................................................................................8
CHARACTERISTIC CURVES...............................................................................................................................9
P
ERFORMANCE
C
URVES
– E
FFICIENCY AND
OCP ....................................................................................................9
P
ERFORMANCE
C
URVES
– T
RANSIENT
R
ESPONSE
..................................................................................................10
P
ERFORMANCE
C
URVES
– S
TARTUP
C
HARACTERISTICS
.........................................................................................11
P
ERFORMANCE
C
URVES
– S
TARTUP FROM
CNT C
ONTROL
.....................................................................................11
FEATURE DESCRIPTION...................................................................................................................................12
CNT F
UNCTION
....................................................................................................................................................12
T
RIM
....................................................................................................................................................................13
M
INIMUM
L
OAD
R
EQUIREMENTS
..........................................................................................................................14
O
UTPUT
O
VER
-
CURRENT
P
ROTECTION
..................................................................................................................14
O
UTPUT
F
ILTERS
..................................................................................................................................................14
D
ECOUPLING
........................................................................................................................................................15
O
UTPUT
O
VER
-V
OLTAGE
P
ROTECTION
..................................................................................................................15
G
ROUND
L
OOPS
....................................................................................................................................................15
DESIGN CONSIDERATION ................................................................................................................................17
T
YPICAL
A
PPLICATION
..........................................................................................................................................17
F
USING
.................................................................................................................................................................18
I
NPUT
R
EVERSE
V
OLTAGE
P
ROTECTION
................................................................................................................18
EMC ....................................................................................................................................................................18
S
AFETY
C
ONSIDERATION
......................................................................................................................................20
THERMAL CONSIDERATION ...........................................................................................................................21
MTBF .....................................................................................................................................................................21
MECHANICAL CONSIDERATIONS..................................................................................................................22
DATE: Feb. 18, 2003
MODEL : ALT Series
S 2 / 25
ALT Series Technical Reference Note
I
NSTALLATION
......................................................................................................................................................22
S
OLDERING
..........................................................................................................................................................22
MECHANICAL CHART.......................................................................................................................................23
ORDERING INFORMATION ..............................................................................................................................24
MODEL NUMBERING.........................................................................................................................................25
DATE: Feb. 18, 2003
MODEL :ALT Series
S 3 / 25
ALT Series Technical Reference Note
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage and
temperature conditions. Standard test condition on a single unit is as following:
Ta(ambient): 25°C
+Vin:
−Vin:
CNT:
+Vo:
−Vo:
COM:
Trim(Vadj):
48V +/
−2%
return pin for +Vin
Open
connect to load
connect to load
connect to load
Open
Input Specifications
Notes: I(out1) is the load of +Vo, I(out2) is the load of –Vo.
Parameter
Operating Input Voltage
Maximum Input Current
(V
I
= 0 to V
I,max
,
I(out1)
=
I(out2)=
Io,max)
Input Reflected-ripple Current
(
5Hz to 20MHz: 12uH source
impedance: T
A
= 25 ºC.)
Device
All
5V
12V
All
Symbol
V
I
I
I,max
I
I,max
I
I
Min
36
-
-
-
Typ
48
-
-
-
Max
75
1.5
1.5
40
Unit
V
DC
A
A
mAp-p
No Load Input Power
(V
I
= V
I,nom
)
All
-
-
-
1
W
CAUTION: This power module is not internally fused. An input line fuse must always be used.
DATE: Feb. 18, 2003
MODEL :ALT Series
S 4 / 25
ALT Series Technical Reference Note
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the
device. These are absolute stress ratings only. Functional operation of the device in not
implied at these or any other conditions in excess of those given in the operational sections
of the IPS. Exposure to absolute maximum ratings for extended periods can adversely affect
device reliability.
Parameter
Input Voltage:
Continuous:
Transient (100ms)
Operating Ambient
Temperature
Storage Temperature
Operating Humidity
I/O Isolation
(Conditions: 50µA for 5 sec,
slew rate of 1500V/10sec)
Input-Output
Output Power
Device
Symbol
Min
Typ
Max
Unit
All
All
All
V
I
V
I, trans
Tc/Ta
0
0
-40
-
-
-
80
100
55
V
DC
V
DC
ºC
All
All
T
STG
-
-55
-
-
-
125
85
ºC
%
All
5V
12V
-
Po,max
Po,max
-
-
-
-
-
-
1500
30
30
V
DC
W
W
DATE: Feb. 18, 2003
MODEL : ALT Series
S 5 / 25
