ALT Series Technical Reference Note
ALT Isolated DC/DC Converter Module
Industry Standard Size – 36-75V Input, 3.3V, 5V, 12V and 15V single Output
Features
•
•
•
•
•
•
•
•
•
•
•
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 come in 48V input versions, each of which uses a 2:1 input range of 36~75V. The
series can provide 5V@5A, 3.3V@6A, 12V@2.1A and 15V@1.67A single output, outputs
are isolated from input. And the converters are capable of providing up to 25 watts of output
power.
DATE: Feb. 18, 2003
MODEL : ALT
Series
S1
/ 28
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
....................................................................................................................9
P
ERFORMANCE
C
URVES
– O
UTPUT
P
ERFORMANCE
C
URVES
..................................................................................10
P
ERFORMANCE
C
URVES
– T
RANSIENT
R
ESPONSE
..................................................................................................11
P
ERFORMANCE
C
URVES
– T
RANSIENT
R
ESPONSE
(C
ONT
)......................................................................................12
P
ERFORMANCE
C
URVES
– S
TARTUP
C
HARACTERISTICS
.........................................................................................13
P
ERFORMANCE
C
URVES
– S
TARTUP FROM
CNT C
ONTROL
.....................................................................................14
FEATURE DESCRIPTION...................................................................................................................................15
CNT F
UNCTION
....................................................................................................................................................15
T
RIM
....................................................................................................................................................................16
M
INIMUM
L
OAD
R
EQUIREMENTS
..........................................................................................................................17
O
UTPUT
O
VER
-
CURRENT
P
ROTECTION
..................................................................................................................17
O
UTPUT
F
ILTERS
..................................................................................................................................................17
D
ECOUPLING
........................................................................................................................................................18
G
ROUND
L
OOPS
....................................................................................................................................................18
O
UTPUT
O
VER
-V
OLTAGE
P
ROTECTION
..................................................................................................................19
DESIGN CONSIDERATION ................................................................................................................................20
T
YPICAL
A
PPLICATION
..........................................................................................................................................20
F
USING
.................................................................................................................................................................21
I
NPUT
R
EVERSE
V
OLTAGE
P
ROTECTION
................................................................................................................21
EMC ....................................................................................................................................................................21
S
AFETY
C
ONSIDERATION
......................................................................................................................................23
THERMAL CONSIDERATION ...........................................................................................................................24
MTBF .....................................................................................................................................................................24
DATE: Feb. 18, 2003
MODEL : ALT
Series
S2
/ 28
ALT Series Technical Reference Note
MECHANICAL CONSIDERATIONS..................................................................................................................25
I
NSTALLATION
......................................................................................................................................................25
S
OLDERING
..........................................................................................................................................................25
MECHANICAL CHART
(PIN SIDE VIEW)
...................................................................................................26
ORDERING INFORMATION ..............................................................................................................................27
MODEL NUMBERING.........................................................................................................................................28
DATE: Feb. 18, 2003
MODEL : ALT Series
S 3 / 28
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:
+Vout:
−Vout:
Trim(Vadj):
48V +/
−2%
return pin for +Vin
Open
connect to load
connect to load (return)
Open
Input Specifications
Parameter
Operating Input Voltage
Maximum Input Current
(V
I
= 0 to V
I,max
, I
o
= I
o,max
)
Device
All
5V
3.3V
12V
15V
Symbol
V
I
I
I,max
I
I,max
I
I,max
I
I,max
Min
36
-
-
-
-
Typ.
48
-
-
-
-
Max
75
1
1
1
1
Unit
Vdc
A
A
A
A
Input Reflected-ripple Current
(
5Hz to 20MHz: 12 H source
impedance: Ta = 25 ºC.)
All
I
I
-
-
40
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 / 28
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 is 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
Temperature
Storage Temperature
Operating Humidity
Basic Isolation
(Conditions : 50µA for 5 sec,
slew rate of 1500V/10sec)
Input-Output
Output Power
Ambient
Device
Symbol
Min
Typ.
Max
Unit
All
All
All
V
I
V
I, trans
Tc/Ta
0
0
-40
-
-
-
80
100
55
Vdc
Vdc
ºC
All
All
T
STG
-
-55
-
-
-
125
85
ºC
%
All
5V
3.3V
12V
15V
-
P
o,max
P
o,max
P
o,max
P
o,max
-
-
-
-
-
-
-
-
-
-
1500
25
19.8
25.2
25.05
Vdc
W
W
W
W
DATE: Feb. 18, 2003
MODEL : ALT
Series
S5
/ 28
