Cassette Style
DC-DC Converters
Q Series
Edition 5/5.2000
6/25
Electrical Input Data
General Conditions:
–
TA = 25
°C, unless T
C is specified.
– Sense lines connected directly at the connector, inhibit (28) connected to Vi– (32).
– R input not connected; with option P,
Uo set to Uo nom at Ui nom.
Table 2a: Input data
Input
BQ
GQ
CQ 2
Characteristics
Conditions
min
typ
max
min
typ
max
min
typ
max
Unit
Ui
Operating input voltage
Io = 0...Io max
14.4
36
22
54
35
75
V DC
Ui nom
Nominal input voltage
TC min...TC max
24
36
48
Ui abs
Input voltage limits
without damage
0
50
0
63
0
100
Ii
Typical input current 1
Ui nom, Io nom
4.5
3.0
2.2
A
Pi 0
No-load input power
Ui min…Ui max
2.5
3.0
2.5
W
Io = 0
Pi inh
Idle input power
unit inhibited
1.0
1.5
Iinr p
Peak inrush current 2
Ui nom, Io nom
55
40
35
A
tinr r
Rise time
50
40
35
s
tinr h
Trailing edge half-life
130
110
80
Table 2b: Input data
Input
DQ
EQ
Characteristics
Conditions
min
typ
max
min
typ
max
Unit
Ui
Operating input voltage
Io = 0...Io max
43
108
65
150
V DC
for
≤2 s
TC min...TC max
n.a.
65
168
for
≤100 ms
36
115
55
176
Ui nom
Nominal input voltage
72
110
Ui abs
Input voltage limits
without damage
0
125
0
200
Ii
Typical input current 1
Ui nom, Io nom
1.5
1.0
A
Pi 0
No-load input power
Ui min…Ui max
5.5
4.0
W
Io = 0
Pi inh
Idle input power
unit inhibited
3.5
Iinr p
Peak inrush current 2
Ui nom, Io nom
20
45
A
tinr r
Rise time
50
15
s
tinr h
Trailing edge half-life
90
25
1 Typical input current depends on individual module
2 According to prETS 300132-2
Input Fuse
A fuse mounted inside the converter protects the module in
case of failure against severe defects. The fuse can not be
made externally accessible. Reverse polarity at the input
will cause the fuse to blow.
Table 3: Fuse specification
Module
Fuse type
Fuse rating
BQ
fast-blow
Littelfuse 275
2
× 7 A, 125 V
GQ
fast-blow
Littelfuse 275
2
× 7 A, 125 V
CQ
fast-blow
Littelfuse 275
10 A, 125 V
DQ
fast-blow
Littelfuse 275
7 A, 125 V
EQ
very fast-blow
Littelfuse 263
5 A, 250 V
Input Transient Protection
A metal oxide VDR (Voltage Dependent Resistor) together
with the input fuse and a symmetrical input filter form an ef-
fective protection against high input transient voltages
which typically occur in most installations, but especially in
battery driven mobile applications.
Nominal battery voltages in use are: 24, 36, 48, 60, 72, 96
and 110 V. In most cases each nominal value is specified in
a tolerance of –30%...+25%, with short excursions to
±40% or even more.
In certain applications, surges according to RIA 12 are
specified in addition to those defined in IEC 60571-1 or EN
50155. The power supply must not switch off during these
surges and since their energy can practically not be ab-
sorbed an extremely wide input range is required. The Q
series input range has been designed and tested to meet
most of these requirements. See also:
EMC (surge B).