Benign Environment DC-DC Converters ≤100 Watt H Series
Edition 4/4.99
1/19
MELCHER
The Power Partners.
50 Watt DC-DC Converters H Series
Single output: series 12H/24H/48H1000
Double output: series 12H/24H/48H2000
Triple output: series 12H/24H/48H3000
• Wide input voltage range suitable for battery operation
• Efficient input filter and built-in surge and transient
suppression circuitry
•3 kV
rms input to output electric strength test
• Outputs individually isolated
• Outputs fully protected against overload
Safety according to IEC/EN 60950
LGA
C
Summary
The H series of DC-DC converters represents a broad and
flexible range of power supplies for use in advanced elec-
tronic systems. Features include high efficiency, reliability
and reasonable output voltage noise.
The converter inputs are protected against surges and tran-
sients occuring at the source lines. An input over- and
undervoltage cut-out circuitry disables the outputs if the in-
put voltage is outside the specified range.
All outputs are open- and short-circuit proof and are pro-
tected against overvoltages by means of built-in suppres-
sor diodes. The outputs can be inhibited by a logic signal
applied to the connector pin 2 (i). If the inhibit function is not
used pin 2 should be connected to pin 23 to enable the out-
puts.
LED indicators display the status of the converter and allow
visual monitoring of the system at any time.
Full input to output, input to case, output to case and output
to output isolation is provided. The modules are designed
and built according to the international safety standard
IEC/EN 60950 and have been approved by the safety
agencies LGA (Germany) and UL (USA). The UL Mark for
Canada has been officially recognized by regulatory au-
thorities in provinces across Canada.
The case design allows operation at nominal load up to
50°C in a free air ambient temperature. If forced cooling is
provided, the ambient temperature may exceed 50°C but
the case temperature should remain below 80°C under all
conditions.
A temperature sensor generates an inhibit signal which
disables the outputs if the case temperature
T
C exceeds the
limit. The outputs are automatically re-enabled when the
temperature drops below the limit.
Various options are available to adapt the converters to in-
dividual applications.
The modules may either be plugged into 19 inch rack sys-
tems according to DIN 41494, or be chassis mounted.
168
6.6"
39
1.54"
8TE
111
4.37"
3U
Table of Contents Page
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 2
Type Key .......................................................................... 2
Functional Description...................................................... 3
Electrical Input Data ......................................................... 4
Electrical Output Data ...................................................... 5
Auxiliary Functions ........................................................... 8
Page
Electromagnetic Compatibility (EMC) ............................ 10
Mechanical Data ............................................................ 11
Immunity to Environmental Conditions........................... 12
Safety and Installation Instructions ................................ 12
Description of Options .................................................... 15
Accessories .................................................................... 19
H Series DC-DC Converters ≤100 Watt Benign Environment
Edition 4/4.99
2/19
MELCHER
The Power Partners.
Type Survey and Key Data
Table 1: Type survey
Output 1 Output 2 Output 3 Input Voltage Range and Efficiency 1 Option
U
o nom
I
o nom
U
o nom
I
o nom
U
o nom
I
o nom
U
i min...
U
i max hmin
U
i min...
U
i max hmin
U
i min...
U
i max hmin
[V DC] [A] [V DC] [A] [V DC] [A] 8...15 V DC 2 [%] 14...30 V DC 2 [%] 28...60 V DC 2 [%]
5.1 8.0 - - - - 12H1001-2R 73 24H1001-2R 75 48H1001-2R 76 V2, V3
12.0 4.0 - - - - 12H1301-2R 79 24H1301-2R 82 48H1301-2R 82 D1...D8
15.0 3.4 - - - - 12H1501-2R 80 24H1501-2R 82 48H1501-2R 83 -7
24.0 2.0 - - - - 12H1601-2R 81 24H1601-2R 83 48H1601-2R 85
48.0 1.0 - - - - 12H1901-2R 2 83 24H1901-2R 2 85 48H1901-2R 2 86
12.0 2.0 12.0 2.0 - - 12H2320-2 79 24H2320-2 80 48H2320-2 82
15.0 1.7 15.0 1.7 - - 12H2540-2 80 24H2540-2 81 48H2540-2 83
5.1 5.0 12.0 0.7 12.0 0.7 12H3020-2 77 24H3020-2 78 48H3020-2 79
5.1 5.0 15.0 0.6 15.0 0.6 12H3040-2 77 24H3040-2 79 48H3040-2 80
1Efficiency measured at
U
i nom and
I
o nom
2Input voltage range 12H1901-2R: 9...15 V DC, 24H1901-2R: 18...30 V DC, 48H1901-2R: 36...60 V DC
Type Key and Product Marking
Type Key 48 H 2 5 40 -2 R D V
Input voltage range
U
i: 8...15 V DC ............. 12
14...30 V DC ............. 24
28...60 V DC ............. 48
Series .............................................................................. H
Number of outputs ...................................................... 1...3
Output 1,
U
o1 nom: 5.1 V ............... 0
12 V ............... 3
15 V ............... 5
24 V ............... 6
48 V ............... 9
Single output modules ................................................... 01
Output 2 and 3,
U
o2 nom,
U
o3 nom: 12 V ............. 20
15 V ............. 40
Options and features:
Ambient temperature range
T
A –10...50°C ..................... -2
Extended temperature range
T
A –25...71°C.................... -7
Output voltage control input (single output modules only)R
Save data signal (D1...D8, to be specified) ..................... D 1
ACFAIL signal (V2, V3, to be specified) ........................... V 1
1Option D excludes option V and vice versa
Example: 48H1501-2RD3: DC-DC converter, input voltage range 28...60 V, providing output with 15 V/3.4 A; equipped
with an output voltage control input and undervoltage monitoring.
Benign Environment DC-DC Converters ≤100 Watt H Series
Edition 4/4.99
3/19
MELCHER
The Power Partners.
Functional Description
The input voltage is fed via an input filter to the input capaci-
tor. This capacitor sources a single transistor forward con-
verter. Each output is powered by a separate secondary
winding of the main transformer. The resultant voltages are
rectified and their ripples smoothed by a power choke. The
control logic senses the main output voltage
U
o1 and gener-
ates, with respect to the maximum admissible output cur-
rents, the control signal for the primary switching transistor.
This signal is fed back via a coupling transformer.
The auxiliary outputs
U
o2 and
U
o3 are unregulated. Each
auxiliary output's current is sensed and transferred to the
main control circuit using a current transformer. If one of the
outputs is driven into current limit, the other outputs will re-
duce their output voltages as well because all output cur-
rents are controlled by the same control circuit.
Input filter
Current
limitation
output 3
Main control circuit
Current
limitation
output 2
29
11
8
23
5
26
32
17
14
20
Forward converter
approx. 70 kHz
Y
1
1
Y
Y
Y Y
17
14
2
Vi+
Vi–
i
D/V
R
G
C
MKT
C
MKT
03067
Fig. 1
DC-DC converter block diagram
1Single output modules H1000 (R input)
H Series DC-DC Converters ≤100 Watt Benign Environment
Edition 4/4.99
4/19
MELCHER
The Power Partners.
Electrical Input Data
General conditions:
–
T
A = 25°C, unless
T
C is specified.
– Connector pins 2 and 23 interconnected, R input not connected.
Table 2: Input data
Input 12H 24H 48H
Characteristics Conditions min typ max min typ max min typ max Unit
U
iOperating input voltage
I
o = 0…
I
o nom 8 1514 3028 60V DC
..H1901-2R
T
C min…
T
C max 9 1518 3036 60
U
i nom Nominal input voltage 12 24 48
I
iInput current
U
i nom,
I
o nom 1 5.0 2.5 1.3 A
P
i 0 No-load input power:
U
i nom
Single output
I
o1,2,3 = 0 1 1.5 1 1.5 1 1.5 W
Double output 4 6 4 6 4 6
Triple output 4 6 4 6 4 6
P
i inh Idle input power inhibit mode 2 2 2
I
inr p 3 Peak inrush current
U
i
=
U
i max 380 380 350 A
t
inr r Rise time
R
S = 0 Ω 260 50 20 µs
t
inr h Time to half value
T
C = 25°C110 75 40
R
iInput resistance
T
C = 25°C 40 80 175 mΩ
C
iInput capacitance 2200 3300 750 1200 190 300 µF
U
i abs Input voltage limits 0 20 0 40 0 80 V DC
without any damage
1With multiple output modules, the same condition for each output applies.
2
R
S = source resistance
3
I
inr p
=
U
i/(
R
s
+
R
i)
Input Under-/Overvoltage Lock-out
If the input voltage remains below 0.8
U
i min or exceeds
1.1
U
i max (approx. values), an internally generated inhibit
signal disables the output(s). When checking this function
the absolute maximum input voltage rating
U
i abs must be
carefully considered (see table:
Electrical Input Data
). Be-
tween
U
i min and the undervoltage lock-out level the output
voltage may be below the value defined in table:
Output
data
(see:
Technical Information: Measuring and Testing
).
Reverse Polarity
The unit is not protected against reverse polarity at the in-
put. (Reverse polarity will cause the external fuse to blow.)
Input Fuse
The modules do not incorporate any fuse. External fuses
installed in the wiring to the inputs are essential.
Table 3: Recommended fuse types
Series Schurter type Part number
12H SPT 10 A 250 V 0001.2514
24H SPT 8 A 250 V 0001.2513
48H SPT 3.15 A 250 V 0001.2509
Benign Environment DC-DC Converters ≤100 Watt H Series
Edition 4/4.99
5/19
MELCHER
The Power Partners.
Electrical Output Data
General conditions
–
T
A = 25°C, unless
T
C is specified.
– Connector pins 2 and 23 interconnected, R input not connected.
Table 4a: Output data
Output 5.1 V 12 V 15 V
Characteristics Conditions min typ max min typ max min typ max Unit
U
o1 Output voltage
U
i nom,
I
o nom 1 5.00 5.20 11.76 12.24 14.70 15.30 V
U
o2/3 - 11.10 12.90 13.90 16.10
U
o2/3 0
U
i min...
U
i max - 13.80 17.25
I
o2/3 = 0
U
o1 P Output overvoltage 7.5 21 25
U
o2/3 P protection -2531
I
o nom Output current
U
i min...
U
i max see:
Type Survey and Key Data
I
o L Output current
T
C min...
T
C max see fig.:
Typical output voltage U
o1
versus output currents I
o
limitation response
u
o1/2/3 Output Switch. freq.
U
i nom,
I
o nom 130 50 60 100 50 80 mVpp
voltage Total IEC/EN 61204 60 200 70 200 75 200
noise BW = 20 MHz
D
U
o1 U Static line regulation
U
i min...
U
i nom ±50 ±100 ±100 mV
D
U
o2/3 U
U
i nom...
U
i max -±150 ±150
I
o nom 1
D
U
o1 I Static load regulation
U
i nom 50 150 150
D
U
o2/3 I
I
o =
I
o nom...0 2 - see:
H2320/H3020
see:
H2540/H3040
= D
U
o 2/3
vers
.
I
o 2/3 = D
U
o 2/3
vers.
I
o 2/3
D
U
o1 Ic Static cross load
U
i nom ±5±15 ±10 ±30 ±15 ±45
D
U
o2/3 Ic regulation 3
I
o =
I
o nom...0 4 - see:
H2320/H3020
see:
H2540/H3040
= D
U
o 2/3
vers
.
I
o 2/3 = D
U
o 2/3
vers
.
I
o 2/3
Table 4b: Output data
Output 24 V 48 V
Characteristics Conditions min typ max min typ max Unit
U
o1 Output voltage
U
i nom,
I
o1 nom 23.52 24.48 47.04 48.96 V
U
o P Overvoltage prot. 41 85
I
o1 nom Output current
U
i min...
U
i max see:
Type Survey and Key Data
I
o1 L Output current
T
C min...
T
C max see:
Typical output voltage U
o1
limitation response
versus output currents I
o
u
o1/2/3 Output Switch. freq.
U
i nom,
I
o nom 130 50 20 40 mVpp
voltage Total IEC/EN 61204 75 200 35 150
noise BW = 20 MHz
D
U
o1 U Static line regulation
U
i min...
U
i nom ±150 ±150 mV
U
i nom...
U
i max
I
o1 nom
D
U
o1 I Static load regulation
U
i nom 150 150
I
o1 =
I
o1 nom...0
1With multiple output modules, the same condition for each output applies.
2Condition for specified output. With multiple output modules, other output(s) loaded with constant current
I
o =
I
o nom.
3Condition for non-specified output, individually tested, other output(s) loaded with constant current
I
o =
I
o nom.
4Multiple output modules.
H Series DC-DC Converters ≤100 Watt Benign Environment
Edition 4/4.99
6/19
MELCHER
The Power Partners.
Output Protection
Each output is protected against overvoltages which could
occur due to a failure of the internal control circuit. Voltage
suppressor diodes (which under worst case condition may
become a short circuit) provide the required protection. The
suppressor diodes are not designed to withstand externally
applied overvoltages. Overload at any of the outputs will
cause a shut-down of all outputs.
1.0
0
0.5
U
o1
0.5
U
o1 nom
I
o
I
o nom
1.0 1.2
I
o nom
I
o1
I
o2,
I
o3
I
oL1
I
oL2
,I
oL3
.95
05022
Fig. 2
Typical output voltage U
o1
versus output currents
I
o
U
o2/3
[V]
13
12
11
00.25 0.5 0.75 1.0
U
o2/3 0
I
o2/3
I
o2/3 nom
I
o1 nom
0.5 • I
o1 nom
I
o1
= 0 A
05119
Uo2/3 [V]
16
15
14
00.25 0.5 0.75 1.0
Uo2/3 0
Io2/3
Io2/3 nom
Io1 nom
0.5 • Io1 nom Io1 = 0 A
05120
Fig. 3
H2320/H3020:
D
U
o2/3
(typ.) versus I
o2/3
with different I
o1
Fig. 4
H2540/H3040:
D
U
o2/3
(typ.) versus I
o2/3
with different I
o1
Parallel and Series Connection
Main outputs of equal nominal voltage can be connected in
parallel. It is important to assure that the main output of a
multiple output module is forced to supply a minimum cur-
rent of 0.1 A to enable correct operation of its own auxiliary
outputs.
Outputs one and two of a double output unit may be con-
nected in parallel without a minimum current requirement at
the main output. Outputs two and three of a triple output
unit can be connected in parallel.
In parallel operation, one or more of the main outputs may
operate continuously in current limitation which will cause
an increase in case temperature. Consequently, a reduc-
tion of the max. ambient temperature by 10 K is recom-
mended.
Main or auxiliary outputs can be connected in series with
any other output of the same or another module. In series
connection, the maximum output current is limited by the
lowest current limit. Output ripple and regulation values are
added. Connection wiring should be kept as short as possi-
ble.
If output terminals are connected together in order to estab-
lish multi-voltage configurations, e.g. +5.1 V, ±12 V etc. the
common ground connecting point should be as close as
possible to the connector of the converter to avoid exces-
sive output ripple voltages.
Benign Environment DC-DC Converters ≤100 Watt H Series
Edition 4/4.99
7/19
MELCHER
The Power Partners.
Thermal Protection
A temperature sensor generates an internal inhibit signal
which disables the outputs if the case temperature exceeds
T
C max. The outputs are automatically re-enabled if the tem-
perature drops below this limit.
Thermal Considerations
If a converter is located in free, quasi-stationary air (con-
vection cooling) at the indicated maximum ambient tem-
perature
T
A max (see table:
Temperature specifications)
and
is operated at its nominal input voltage and output power,
the temperature measured at the
Measuring point of case
temperature T
C
(see:
Mechanical Data
) will approach the
indicated value
T
C max after the warm-up phase. However,
the relationship between
T
A and
T
C depends heavily on the
conditions of operation and integration into a system. The
thermal conditions are influenced by input voltage, output
current, airflow and temperature of surrounding compo-
nents and surfaces.
T
A max is therefore, contrary to
T
C max,
an indicative value only.
Caution: The installer must ensure that under all operat-
ing conditions
T
C remains within the limits stated in the
table:
Temperature specifications.
Notes: Sufficient forced cooling or an additional heat sink
allows
T
A to be higher than 50°C (e.g. 65°C) if
T
C max is not
exceeded.
For -2 units at an ambient temperature
T
A of 65°C with only
convection cooling, the maximum permissible current for
each output is approx. 50% of its nominal value as per fig-
ure.
Output Response
The reaction of the outputs is similar whether the input volt-
age is applied or the inhibit is switched low.
An output voltage overshoot will not occur when the module
is turned on or off.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
40 60 70 80
Io/Io nom
TA [°C]
0.9
1.0
Forced cooling
05032
TC max
50
Convection cooling
TA min
Fig. 5
Output current derating versus temperature for -2 units.
0trtft
t
0
Inhibit
1
Output
0.1
Uo nom
t
0
1
0.95Uo nom
th
Ui
05025
Table 5: Output response time t
r
and t
f
Type of Converter
t
r at
P
o = 0 and
t
f at
P
o =
P
o nom
t
r and
t
f at
P
o = 3/4
P
o nom
t
r at
P
o =
P
o nom Unit
typ max typ max typ max
H1001-2R 3 7 3 7 5 15 ms
H1301-2R 5 15 8 20 10 30
H1501-2R 3 7 5 15 15 40
H1601-2R 8 20 15 35 20 60
H1901-2R 35 90 50 140 85 220
H2320-2 10 30 15 40 25 70
H2540-2 8 20 10 30 20 50
H3020-2 30 75 45 120 75 200
H3040-2 20 60 30 80 50 140
Conditions: R input not used. For multiple output modules the figures indicated in the table above relate to the output
which reacts slowest. All outputs are resistively loaded. Variation of the input voltage within
U
i min...
U
i max does not influence
the values.
Fig. 6
Output response as a function of input voltage (on/off
switching) or inhibit control
H Series DC-DC Converters ≤100 Watt Benign Environment
Edition 4/4.99
8/19
MELCHER
The Power Partners.
Table 6: Inhibit data
Characteristics Conditions min typ max Unit
U
inh Inhibit input voltage to keep
U
o = on
U
i min...
U
i max –50 0.8 V DC
output voltage
U
o = off
T
C min...
T
C max 2.4 50
I
inh Inhibit current
U
inh = 0 –60 –100 –220 µA
Auxiliary Functions
i Inhibit for Remote On and Off
Note: With open i input: Output is disabled (
U
o = off).
The outputs of the module may be enabled or disabled by
means of a logic signal (TTL, CMOS, etc.) applied between
the inhibit input i and the negative pin of output 1 (Vo1–). In
systems with several units, this feature can be used, for ex-
ample, to control the activation sequence of the converters.
If the inhibit function is not required, connect the inhibit pin
2 to pin 23 to enable the outputs (active low logic, fail safe).
For output response refer to:
Output Response
.
Vi+
Vi–Vo–
i
Vo+
I
inh
U
inh
06031
1.6
0.8
0
–0.8
–50 U
inh
[V]
I
inh
[mA]
–30 0–10 10 30 50
2.0
1.2
0.4
–0.4
U
inh
= 0.8 V
U
o
= on U
o
= off
U
inh
= 2.4 V
06032
Fig. 7
Definition of U
inh
and I
inh
.
Fig. 8
Typical inhibit current I
inh
versus inhibit voltage U
inh
R-Control for Output Voltage Adjustment
Note: With open R input,
U
o ≈
U
o nom.
As a standard feature, single output modules offer an
adjustable output voltage identified by letter R in the type
designation.
The output voltage
U
o1 can either be adjusted with an exter-
nal voltage (
U
ext) or with an external resistor (
R
1 or
R
2). The
adjustment range is approximative 0...110% of
U
o nom. For
output voltages
U
o >
U
o nom, the minimum input voltage ac-
cording to
Electrical Input Data
increases proportionally to
U
o/
U
o nom.
Fig. 9
Voltage adjustment with external voltage U
ext
a)
U
o ≈ 0...110%
U
o nom, using
U
ext between R (14) and
G (17):
U
o
U
ext
U
ext ≈ 2.5 V • –––––
U
o ≈
U
o nom • –––––
U
o nom 2.5 V
Fig. 10
Voltage adjustment with external resistor R
1
or R
2
b)
U
o ≈ 0...100%
U
o nom, using
R
1 between R (14) and
G (17):
R
14000 Ω •
U
o
U
o ≈
U
o nom • –––––––––––
R
1 ≈––––––––––
R
1 + 4000 Ω
U
o nom -
U
o
c)
U
o ≈
U
o nom...
U
o max, using
R
2 between R (14) and
Vo1+ (20):
U
o max =
U
o nom + 10%
4000 Ω •
U
o • (
U
o nom – 2.5 V)
R
2 ≈––––––––––––––––––––––––
2.5 V • (
U
o –
U
o nom)
U
o nom • 2.5 V •
R
2
U
o ≈––––––––––––––––––––––––––––––––
2.5 V • (
R
2 + 4000 Ω) –
U
o nom • 4000 Ω
Vo1+
R
+
4000 Ω
G
U
ref
U
ext
–
+
06087
Caution: To prevent damage,
U
ext should not exceed
8 V, nor be negative.
Vo1+
R–
+
G
4000 Ω
U
ref
R
1
R
2
06088
Caution: To prevent damage,
R
2 should never be less
than 47 kΩ.
Note: R inputs of n units with paralleled outputs may be
paralleled, too, but if only one external resistor is to be
used, its value should be R1/n, or R2/n respectively.
Benign Environment DC-DC Converters ≤100 Watt H Series
Edition 4/4.99
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MELCHER
The Power Partners.
Table 7b: R
2
for U
o
> U
o nom
(conditions: U
i nom
, I
o nom
, rounded up to resistor values E 96); R
1
=
∞
U
o nom = 5.1 V
U
o nom = 12 V
U
o nom = 15 V
U
o nom = 24 V
U
o nom = 48 V
U
o [V]
R
2 [kΩ]
U
o [V]
R
2 [kΩ]
U
o [V]
R
2 [kΩ]
U
o [V]
R
2 [kΩ]
U
o [V]
R
2 [kΩ]
5.15 464 12.1 1780 15.2 1470 24.25 3160 48.5 6810
5.20 215 12.2 909 15.4 750 24.50 1620 49.0 3480
5.25 147 12.3 619 15.6 511 24.75 1100 49.5 2370
5.30 110 12.4 464 15.8 383 25.00 825 50.0 1780
5.35 90.9 12.5 383 16.0 332 25.25 715 50.5 1470
5.40 78.7 12.6 316 16.2 274 25.50 590 51.0 1270
5.45 68.1 12.7 274 16.4 237 25.75 511 51.5 1100
5.50 61.9 12.8 249 16.5 226 26.00 453 52.0 953
13.0 200 26.25 402 52.5 845
13.2 169 26.40 383 52.8 806
Table 7a: R
1
for U
o
< U
o nom
(conditions: U
i nom
, I
o nom
, rounded up to resistor values E 96); R
2
=
∞
U
o nom = 5.1 V
U
o nom = 12 V
U
o nom = 15 V
U
o nom = 24 V
U
o nom = 48 V
U
o [V]
R
1 [kΩ]
U
o [V]
R
1 [kΩ]
U
o [V]
R
1 [kΩ]
U
o [V]
R
1 [kΩ]
U
o [V]
R
1 [kΩ]
0.5 0.432 2.0 0.806 2.0 0.619 4.0 0.806 8.0 0.806
1.0 0.976 3.0 1.33 4.0 1.47 6.0 1.33 12.0 1.33
1.5 1.65 4.0 2.0 6.0 2.67 8.0 2.0 16.0 2.0
2.0 2.61 5.0 2.87 8.0 4.53 10.0 2.87 20.0 2.87
2.5 3.83 6.0 4.02 9.0 6.04 12.0 4.02 24.0 4.02
3.0 5.76 7.0 5.62 10.0 8.06 14.0 5.62 28.0 5.62
3.5 8.66 8.0 8.06 11.0 11.0 16.0 8.06 32.0 8.06
4.0 14.7 9.0 12.1 12.0 16.2 18.0 12.1 36.0 12.1
4.5 30.1 10.0 20.0 13.0 26.1 20.0 20.0 40.0 20.0
5.0 200.0 11.0 44.2 14.0 56.2 22.0 44.2 44.0 44.2
Display Status of LEDs
Uo1
> 0.95…0.98Uo1 adj
Ui max Ui ov
Ui min
Ui uv
Ui
Ui abs
OK
i
Uo1 > 0.95…0.98Uo1 adj
Io nom IoL
Io
OK
Uo1 < 0.95…0.98Uo1 adj
TC
i
TC max TPTC threshold
Ui inh
i
+50 V
+0.8 V +2.4 V
-50 V
Uinh threshold
LED off LED on
LED Status undefined
06090
Fig. 11
LEDs
"OK"
and
"i"
status versus input voltage
Conditions: I
o
≤
I
o nom
, T
C
≤
T
C max
, U
inh
≤
0.8 V
U
i uv
= undervoltage lock-out, U
i ov
= overvoltage lock-out
LED
"OK"
status versus output current
Conditions: U
i min...
U
i max
, T
C
≤
T
C max
, U
inh
≤
0.8 V
LED
"i"
versus case temperature
Conditions: U
i min...
U
i max
, I
o
≤
I
o nom
, U
inh
≤
0.8 V
LED
"i"
versus U
inh
Conditions: U
i min...
U
i max
, I
o
≤
I
o nom
, T
C
≤
T
C max
H Series DC-DC Converters ≤100 Watt Benign Environment
Edition 4/4.99
10/19
MELCHER
The Power Partners.
driven mobile applications. The H series has been success-
fully tested to the following specifications:
Electromagnetic Compatibility (EMC)
A suppressor diode together with an input filter form an ef-
fective protection against input transient voltages which
typically occur in most installations, but especially in battery
Electromagnetic Immunity
Table 8: Immunity type tests
Phenomenon Standard 1 Level Coupling Value Waveform Source Test In Per-
mode 2 applied imped. procedure oper. form. 3
Electrostatic IEC/EN 2 contact discharge 4000 Vp1/50 ns 330 Ω10 positive and yes A
discharge 61000-4-2 10 negative
(to case) discharges
Electromagnetic IEC/EN x antenna 20 V/m AM 80% n.a. 26…1000 MHz yes A
field 61000-4-3 1 kHz
Electrical fast IEC/EN 1 direct, i/c, +i/–i 500 Vpbursts of 5/50 ns 50 Ω1 min positive yes
transient/burst 61000-4-4 2.5 / 5 kHz over 1 min negative
15 ms; burst transients per
period: 300 ms coupling mode
Surge IEC/EN 1 i/c 500 Vp1.2/50 µs 12 Ω5 pos. and 5 neg. yes A
61000-4-5 +i/–i2 Ωsurges per
1Related and previous standards are referenced in:
Technical Information: Standards
.
2i = input, o = output, c = case.
3A = Normal operation, no deviation from specifications, B = Normal operation,temporary deviation from specs possible.
Electromagnetic Emissions
Table 9: Emissions at U
i nom
and I
o nom
Series Standard
CISPR 11/EN 55011, 1991
CISPR 22/EN 55022, 1987
≤30 MHz ≥30 MHz
12H <A <B
24H <B <B
48H <B <B
Benign Environment DC-DC Converters ≤100 Watt H Series
Edition 4/4.99
11/19
MELCHER
The Power Partners.
Mechanical Data
Dimensions in mm. Tolerances ±0.3 mm unless otherwise indicated.
111.2
±0.8
3U
88
(11.6)
168.5
±0.5
127
173.7
±0.5
20
100
±0.6
1.6
6TE
2
5
8
11
14
17
20
23
26
29
32
Male connector H 11 according to DIN 41 612
38.7
95
±0.5
Measurement point for
case temperatureT
C
M 3; depth = 4 mm
(chassis mount)
22
68
159.4
Mounting plane of
connector H11
25.40
30.48
2TE
7.09
17.25
Mounting holes for retaining clips V
12.17
103
3.27
20.5 12.1
94.5
±0.1
0
31.5
±0.1
0
ø 3.5
ø 4.0
OK (LED green)
Inhibit i (LED red)
Potentiometer
(option D or V)
Front plate
Main face Rear
face
Back plate
09050
European
Projection
Fig. 12
DC-DC converter in case H02, weight 770 g (approx.)
Case aluminium, black finish and self cooling.
H Series DC-DC Converters ≤100 Watt Benign Environment
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Table 11: Temperature specifications, values given are for an air pressure of 800...1200 hPa (800...1200 mbar)
Temperature Standard -2 Option -7
Characteristics Conditions min max min max Unit
T
AAmbient temperature 1 Operational 2 –10 50 –25 71 °C
T
CCase temperature 3 –10 80 –25 95
T
SStorage temperature 1 Not operational –25 100 –40 100
1 MIL STD 810D section 501.2 and 502.2. 2 See:
Thermal considerations.
3 Overtemperature lock-out at
T
C >95°C (PTC).
Table 12: MTBF
Values at specified Module Types Ground Benign Unit
Case Temperature 40°C
MTBF 1H1000 384'000 h
H2000 306'000
H3000 270'000
Immunity to Environmental Conditions
Table 10: Mechanical stress
Test method Standard Test conditions Status
Ca Damp heat IEC/DIN IEC 60068-2-3 Temperature: 40 ±2 °C Unit not
steady state MIL-STD-810D section 507.2 Relative humidity: 93 +2/-3 % operating
Duration: 21 days
Ea Shock IEC/EN/DIN EN 60068-2-27 Acceleration amplitude: 15 gn = 147 m/s2Unit
(half-sinusoidal) MIL-STD-810D section 516.3 Bump duration: 11 ms operating
Number of bumps: 18 (3 each direction)
Eb Bump IEC/EN/DIN EN 60068-2-29 Acceleration amplitude: 10 gn = 98 m/s2
(half-sinusoidal) MIL-STD-810D section 516.3 Bump duration: 16 ms
Number of bumps: 6000 (1000 each direction)
Fc Vibration IEC/EN/DIN EN 60068-2-6 Acceleration amplitude: 0.15 mm (10...60 Hz)
(sinusoidal) MIL-STD-810D section 514.3 2 gn = 20 m/s2 (60...150 Hz)
Frequency (1 Oct/min): 10...150 Hz
Test duration: 3.75 h (1.25 h each axis)
Safety and Installation Instructions
Connector pin Allocation
The connector pin allocation table defines the electrical
potentials and the physical pin positions on the H11 con-
nector. Pin no. 26, the protective earth pin present on all
12H…48H DC-DC converters is leading, ensuring that it
makes contact with the female connector first.
32 29 26 23 20 17 14 11 852
10028
Fig. 13
View of male H11 connector.
Table 13: H11 connector pin allocation and designation
Electrical Determination H1000 H2000 H3000
Pin Ident Pin Ident Pin Ident
Inhibit control input 2 i 2 i 2 i
Safe Data or ACFAIL 5 D or V 5 D or V 5 D or V
Output voltage (positive) 8 Vo1+ 8 8 Vo3+
Output voltage (negative) 11 Vo1–11 11 Vo3–
Control input + 14 R
Control input –17 G
Output voltage (positive) 14 Vo2+ 14 Vo2+
Output voltage (negative) 17 Vo2–17 Vo2–
Output voltage (positive) 20 Vo1+ 20 Vo1+ 20 Vo1+
Output voltage (negative) 23 Vo1–23 Vo1–23 Vo1–
Protective earthing 1 26 26 26
DC input voltage 29 Vi+ 29 Vi+ 29 Vi+
DC input voltage 32 Vi–32 Vi–32 Vi–
1Leading pin (pregrounding)
1Calculated in accordance with MIL-HDBK-217E (calculation ac-
cording to edition F would show even better results)
Benign Environment DC-DC Converters ≤100 Watt H Series
Edition 4/4.99
13/19
MELCHER
The Power Partners.
Table 14: Isolation
Characteristic Input to Input to Output Output Unit
case output to case to output
Electric Required according to 1.5 3.0 1 0.5 - kVrms
strength IEC/EN 60950 2.1 4.2 1 0.7 - kV DC
test voltage Actual factory test 1 s 2.8 5.6 1 1.4 0.3
AC test voltage equivalent 2.0 4.0 1 1.0 0.2 kVrms
to actual factory test
Insulation resistance at 500 V DC >300 >300 >300 >100 2 MΩ
1In accordance with IEC/EN 60950 only subassemblies are tested in factory with this voltage.
2Tested at 300 V DC.
For creepage distances and clearances refer to:
Technical Information: Safety.
Cleaning Agents
In order to avoid possible damage, any penetration of liq-
uids (e.g. cleaning fluids) is to be prevented, since the
power supplies are not hermetically sealed.
Standards and approvals
12H…48H DC-DC converters correspond to class I equip-
ment. All types are UL recognized according to UL 1950, UL
recognized for Canada to CAN/CSA C22.2 No. 950-95 and
LGA approved to IEC/EN 60950 standards.
The units have been evaluated for:
•Building in
•Supplementary insulation between input and case and
double or reinforced insulation between input and out-
put, based on 250 V AC and 400 V DC
•Operational insulation between output(s) and case
•Operational insulation between the outputs
•The use in a pollution degree 2 environment
•Connecting the input to a primary or secondary circuit
with a maximum transient rating of 2500 V.
The DC-DC converters are subject to manufacturing sur-
veillance in accordance with the above mentioned UL,
CSA, EN and with ISO 9001 standards.
Protection Degree
Condition: Female connector fitted to the unit.
IP 40: All units, except those with option D or V with
potentiometer.
IP 20: All units fitted with option D or V with potentiometer.
Isolation
The electric strength test is performed as a factory test in
accordance with IEC/EN 60950 and UL 1950 and should
not be repeated in the field. Melcher will not honour any
guarantee/warranty claims resulting from electric strength
field tests.
Installation Instructions
The H series DC-DC converters are components, intended
exclusively for inclusion within other equipment by an in-
dustrial assembly operation or by professional installers.
Installation must strictly follow the national safety regula-
tions in compliance with the enclosure, mounting, creep-
age, clearance, casualty, markings and segregation re-
quirements of the end-use application. See also:
Technical
Information: Installation and Application.
Connection to the system shall be made via the female con-
nector H11 (see:
Accessories
)
.
Other installation methods
may not meet the safety requirements.
All DC-DC converters are provided with pin no. 26 ( ),
which is reliably connected with their case. For safety rea-
sons it is essential to connect this pin with the protective
earth of the supply system if required in:
Safety of operator
accessible output circuit
.
Ensure that a unit failure (e.g. by an internal short-circuit)
does not result in a hazardous condition. See also:
Safety
of operator accessible output circuit.
To prevent excessive current flowing into the unit (e.g. by
an internal short-circuit), an external fuse suitable for the
application and in compliance with the local requirements
should be installed in the wiring to one or both input pins
(no. 29 and/or no. 32). See also:
Input Fuse
.
Important: Whenever the inhibit function is not in use,
pin no. 2 (i) should be connected to pin no. 23 (Vo1–) to
enable the output(s).
Do not open the modules, or guarantee will be invali-
dated.
Make sure that there is sufficient air flow possible for con-
vection cooling. This should be verified by measuring the
case temperature when the unit is installed and operated in
the end-use application. The maximum specified case tem-
perature
T
C max shall not be exceeded. See also:
Thermal
Considerations.
If the end-product is to be UL certified, the temperature of
the main isolation transformer should be evaluated as part
of the end-product investigation.
H Series DC-DC Converters ≤100 Watt Benign Environment
Edition 4/4.99
14/19
MELCHER
The Power Partners.
Table 15: Safety concept leading to an SELV output circuit
Conditions Front end DC-DC converter Result
Nominal Minimum required grade Nominal DC output Minimum required Measures to achieve the Safety status
supply of isolation, to be provided voltage from the safety status of the specified safety status of of the DC-DC
voltage by the AC-DC front end, front end front end output the output circuit converter
including mains supplied circuit output circuit
battery charger
Mains Operational (i.e. there is ≤400 V 1 (The Primary circuit Double or reinforced insulation, SELV circuit
≤250 V AC no need for electrical rated voltage based on 250 V AC and 400 V DC
isolation between the between any input (provided by the DC-DC converter)
mains supply voltage and pin and earth can and earthed case 2
theDC-DC converter be up to 250 V AC
input voltage) or 400 V DC)
≤400 V Unearthed Supplementary insulation, based
hazardous voltage on 250 V AC and 400 V DC and
secondary circuit double or reinforced insulation,
based on the maximum nominal
output voltage from the front end
(both provided by the DC-DC con-
verter) and earthed case 3
1The front end output voltage should match the specified operating input voltage range of the DC-DC converter.
2The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950.
3The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950. If the converter
case shall not be connected with earth, the front end output circuit has to be insulated from earth according to the relevant safety
standard by at least basic insulation, based on the maximum nominal output voltage from the front end, and insulated from the con-
verter case by at least supplementary insulation, based on the maximum nominal mains voltage. The converter case is then consid-
ered to be a double insulated accessible part
Fig. 14
Schematic safety concept.
Use earth connection as per table:
Safety concept leading
to an SELV output circuit
. Use fuse according to:
Installa-
tion Instructions.
AC-DC
front
end
DC-DC
con-
verter
Mains SELV
Earth
connection
+
–
~
~
10024
Battery
Max. 250 V AC
or ±400 V DC
Max. 250 V AC
or ±400 V DC
Fuse
Fuse
Safety of operator accessible output circuit
If the output circuit of a DC-DC converter is operator acces-
sible, it shall be an SELV circuit according to the IEC/EN
60950 related safety standards.
Since the H series DC-DC converters provide double or re-
inforced insulation between input and output, based on a
rated primary input voltage of 250 V AC and 400 V DC only
operational insulation is needed between the AC mains and
the input of the DC-DC converter. This means that there is
no need for an electrical isolation between the AC mains
circuit and the DC-DC converter input circuit to cause the
output of an H series DC-DC converter to be an SELV cir-
cuit. Only voltage adaption and rectification to the specified
input voltage range of the DC-DC converter is needed.
The following table shows some possible installation con-
figurations, compliance with which causes the output circuit
of the DC-DC converter to be an SELV circuit according to
IEC/EN 60950 up to a configured output voltage (sum of
nominal voltages if in series or +/– configuration) of 36 V.
However, it is the sole responsibility of the installer to as-
sure the compliance with the relevant and applicable safety
regulations. More information is given in:
Technical Infor-
mation:
Safety
.
Benign Environment DC-DC Converters ≤100 Watt H Series
Edition 4/4.99
15/19
MELCHER
The Power Partners.
Description of Options
Table 16: Survey of options
Option Function of Option Characteristic
-7 Extended operational ambient temperature range
T
A = –25...71°C
D 1Input and/or output undervoltage monitoring circuitry Safe data signal output (D1...D8)
V 1 2 Input and output undervoltage monitoring circuitry ACFAIL signal according to VME specifications ( V2, V3)
1Option D excludes option V and vice versa
2Only available with main output voltage
U
o1 = 5.1 V
-7 Extended Temperature Range
Option -7 extends the operational ambient temperature
range from –10...50°C (standard) to –25...71°C. The power
supplies provide full nominal output power with convection
cooling.
D Undervoltage Monitor
The input and/or output undervoltage monitoring circuit op-
erates independently of the built-in input undervoltage lock-
out circuit. A logic "low" (JFET output) or "high" signal (NPN
output)
is generated at pin 5 as soon as one of the moni-
tored voltages drops below the preselected threshold level
U
t. The return for this signal is Vo1– (pin 23). The D output
recovers when the monitored voltage(s) exceed(s)
U
t+
U
h.
The threshold level
U
t is adjustable by a potentiometer, ac-
cessible through a hole in the front cover.
Option D exists in various versions D1...D8 as shown in the
following table.
Table 17: Undervoltage monitor functions
Output type Monitoring Minimum adjustment range Typical hysteresis
U
h [% of
U
t]
JFET NPN
U
i
U
o1 of threshold level
U
t
for U
t min...
U
t max
U
ti
U
to
U
hi
U
ho
D1 D5 no yes –3.5 V...48 V 1 –2.3...1
D2 D6 yes no
U
i min...
U
i max 1 –3.0...0.5 –
D3 D7 yes yes
U
i min...
U
i max 1 0.95...0.98
U
o1 2 3.0...0.5 "0"
D4 D8 no yes
–
0.95...0.98
U
o1 2
–
"0"
1Threshold level adjustable by potentiometer (not recommended for mobile applications)
2Fixed value between 95% and 98% of
U
o1 (tracking)
JFET output (D1…D4):
Connector pin D is internally connected via the drain-
source path of a JFET (self-conducting type) to the nega-
tive potential of output 1.
U
D ≤ 0.4 V (logic low) corresponds
to a monitored voltage level (
U
i and/or
U
o1) <
U
t. The cur-
rent
I
D through the JFET should not exceed 2.5 mA. The
JFET is protected by a 0.5 W Zener diode of 8.2 V against
external overvoltages.
U
i,
U
o1 status D output,
U
D
U
i or
U
o1 <
U
tlow, L,
U
D ≤ 0.4 V at
I
D = 2.5 mA
U
i and
U
o1 >
U
t +
U
hhigh, H,
I
D ≤ 25 µA at
U
D = 5.25 V
Vo1+
Vo1–
D
U
D
I
D
R
p
Input
11006
Fig. 15
Options D1...D4, JFET output
NPN output (D5...D8):
Connector pin D is internally connected via the collector-
emitter path of a NPN transistor to the negative potential of
output 1.
U
D ≤ 0.4 V (logic low) corresponds to a monitored
voltage level (
U
i and/or
U
o1) >
U
t +
U
h. The current
I
D
through the open collector should not exceed 20 mA. The
NPN output is not protected against external overvoltages.
U
D should not exceed 40 V.
U
i,
U
o1 status D output,
U
D
U
i or
U
o1 <
U
thigh, H,
I
D ≤25 µA at
U
D = 40 V
U
i and
U
o1 >
U
t +
U
hlow, L,
U
D ≤0.4 V at
I
D = 20 mA
Fig. 16
Options D5...D8, NPN output
Vo1+
Vo1–
D
U
D
I
D
R
p
Input
11007
H Series DC-DC Converters ≤100 Watt Benign Environment
Edition 4/4.99
16/19
MELCHER
The Power Partners.
0
1
0.95
0
U
i
[V DC]
0
t
t
t
t
low min4
t
low min4
t
high min
t
h1
U
ti
+
U
hi
U
ti
Input voltage failure Switch-on cycle Input voltage sag Switch-on cycle and subsequent
input voltage failure
U
D high
U
D low
U
D
0
JFET
NPN
t
U
o1
U
o1 nom
U
D high
U
D low
U
D
t
low min4
t
h1
0
0
U
D high
U
D low
U
D
0
JFET
NPN
U
o1
U
D high
U
D low
U
D
t
low min4
U
to
3
Output voltage failure
0
I
D high
I
D low
I
D
t
0
I
D high
I
D low
I
D
t
t
t
t
3
2
33 33
U
o1 nom
U
to
+
U
ho
Input voltage monitoring
Output voltage monitoring
11008
Threshold tolerances and hysteresis:
If
U
i is monitored, the internal input voltage after the input
filter is measured. Consequently this voltage differs from
the voltage at the connector pins by the voltage drop ∆
U
t i
across the input filter. The value of ∆
U
ti depends upon the
input voltage range, threshold level
U
t, temperature and in-
put current. The input current is a function of the input volt-
age and the output power.
Fig. 18
Relationship between U
i
,
U
o1
,
U
D
,
I
D
and U
o1
/U
o nom
versus time.
D
U
ti
U
hi
U
D low
U
D
U
D high
U
i
P
o
=
P
o nom
P
o
= 0
P
o
= 0
U
ti
P
o
=
P
o nom
11021
Fig. 17
Definition of U
ti, ∆
U
ti
and
U
hi
(JFET output)
1n.a.
2With output voltage monitoring the hold-up time
t
h = 0
3The D signal remains high if the D output is connected to
an external source.
4
t
low min = 40...200 ms, typically 80 ms
Benign Environment DC-DC Converters ≤100 Watt H Series
Edition 4/4.99
17/19
MELCHER
The Power Partners.
Formula for additional external input capacitor
2 •
P
o • (
t
h + 0.3 ms) • 100
C
i ext = ––––––––––––––––––––– -
C
i min
η
• (
U
ti 2 –
U
i min2)
where as:
C
i min = minimum internal capacitance [mF], according to
the table below
C
i ext = external input capacitance [mF]
P
o= output power [W]
η
= efficiency [%]
t
h= hold-up time [ms]
U
i min = minimum input voltage [V]
U
ti = threshold level [V]
Remarks: The threshold level
U
ti of option V2 and V3 is
adjusted during manufacture to a value according to table
Undervoltage monitor functions
, section
Option D
.
A decoupling diode should be connected in series with the
input to avoid the input capacitance discharging through
other loads connected to the same source voltage.
V ACFAIL signal (VME)
Available for units with
U
o1 = 5.1 V.
This option defines an undervoltage monitoring circuit
for the input or the input and main output voltage equivalent
to option D and generates the ACFAIL signal (V signal)
which conforms to the VME standard. The low state level of
the ACFAIL signal is specified at a sink current of
I
V = 48 mA
to
U
V ≤0.6 V (open-collector output of a NPN transistor).
The pull-up resistor feeding the open-collector output
should be placed on the VME backplane.
After the ACFAIL signal has gone low, the VME standard
requires a hold-up time
t
h of at least 4 ms before the 5.1 V
output drops to 4.875 V when the 5.1 V output is fully
loaded. This hold-up time
t
h should be provided by an exter-
nal input capacitance. Consequently the working input volt-
age and the threshold level
U
ti
should be adequately above
the minimum input voltage
U
i min of the converter so that
enough energy is remaining in this capacitance.
If the input voltage is below the required level, an external
hold-up capacitor (Ci ext) should be added.
voltage(s) exceed(s)
U
t +
U
h. The threshold level
U
t is ad-
justable by a potentiometer accessible through a hole in the
front cover.
Versions V2 and V3 are available as shown below.
Option V operates independently of the built-in input under-
voltage lock-out circuit. A logic "low" signal is generated at
pin 5 as soon as one of the monitored voltages drops below
the preselected threshold level
U
t. The return for this signal
is Vo1– (pin 23). The V output recovers when the monitored
Table 18: Available internal input capacitance and factory
potentiometer setting of U
ti
with resulting hold-up time.
Types 12H 24H 48H Unit
C
i min 2.2 0.75 0.19 mF
U
t i 9.5 19.5 39 V DC
t
h0.19 0.87 0.89 ms
Table 19: Undervoltage monitor functions
V output Monitoring Minimum adjustment range Typical hysteresis
U
h [% of
U
t]
(VME compatible) of threshold level
U
t
for U
t min...
U
t max
U
i
U
o1
U
ti
U
to
U
hi
U
ho
V2 yes no
U
i min...
U
i max 1 –3.0...0.5 –
V3 yes yes
U
i min...
U
i max 1 0.95...0.98
U
o1 2 3.0...0.5 "0"
1Threshold level adjustable by potentiometer (not recommended for mobile applications)
2Fixed value between 95% and 98% of
U
o1 (tracking), output undervoltage monitoring is not a requirement of VME standard
V output (V2, V3):
Connector pin V is internally connected to the open collec-
tor of a NPN transistor. The emitter is connected to the
negative potential of output 1.
U
V ≤ 0.6 V (logic low) corre-
sponds to a monitored voltage level (
U
i and/or
U
o1) <
U
t.
The current
I
V through the open collector should not exceed
50 mA. The NPN output is not protected against external
overvoltages.
U
V should not exceed 80 V.
U
i,
U
o1 status V output,
U
V
U
i or
U
o1 <
U
tlow, L,
U
V ≤ 0.6 V at
I
V = 50 mA
U
i and
U
o1 >
U
t +
U
hhigh, H,
I
V ≤ 25 µA at
U
V = 5.1 V
Fig. 19
Output configuration of options V2 and V3
Vo1+
Vo1–
V
U
V
I
V
R
p
Input
11009
Formula for threshold level for desired value of
t
h:
2 •
P
o • (
t
h + 0.3 ms) • 100
U
ti = –––––––––––––––––––––– +
U
i min2
C
i min •
η
H Series DC-DC Converters ≤100 Watt Benign Environment
Edition 4/4.99
18/19
MELCHER
The Power Partners.
3
5.1 V
4.875 V
0
U
i
[V DC]
0
t
t
U
ti
+
U
hi
U
ti
Input voltage failure Switch-on cycle Input voltage sag Switch-on cycle and subsequent
input voltage failure
U
V high
U
V low
U
V
0
V2
t
U
o1
0
U
V high
U
V low
U
V
0
V2
U
i
U
ti
4
Output voltage failure
0
U
V high
U
V low
U
V
3
U
ti
+
U
hi
t
low min 2
t
low min 2
t
low min 2
33
4
4
U
V high
U
V low
U
V
0
V3
t
3
t
low min 2
t
low min 2
33
t
h 1
2.0 V
t
h 1
4
3
4
t
low min 2
V3
5.1 V
4.875 V
0
U
o1
2.0 V
Input voltage monitoring
Output voltage monitoring
11010
t
t
t
t
Fig. 21
Relationship between U
i
, U
o1
, U
V
, I
V
and U
o1
/U
o nom
versus time.
1VME request: minimum 4 ms
2
t
low min = 40...200 ms, typically 80 ms
3
U
V level not defined at
U
o1 < 2.0 V
4The V signal drops simultaneously with the output voltage, if the
pull-up resistor
R
P is connected to Vo1+. The V signal remains
high if
R
P is connected to an external source.
D
U
ti
U
hi
U
V low
U
V
U
V high
U
i
P
o
=
P
o nom
P
o
= 0
P
o
= 0
U
ti
P
o
=
P
o nom
11023
Fig. 20
Definition of U
ti
,
∆
U
ti
and U
hi
Threshold tolerances and hysteresis:
If
U
i is monitored, the internal input voltage is measured af-
ter the input filter. Consequently this voltage differs from the
voltage at the connector pins by the voltage drop ∆
U
ti
across input filter and rectifier. The value of ∆
U
ti depends
upon the input voltage range, threshold level
U
t, tempera-
ture and input current. The input current is a function of in-
put voltage and output power.
Benign Environment DC-DC Converters ≤100 Watt H Series
Edition 4/4.99
19/19
MELCHER
The Power Partners.
Accessories
A variety of electrical and mechanical accessories are
available including:
–Front panels for 19" rack mounting, Schroff and Intermas
systems.
–Mating H11 connectors with screw, solder, fast-on or
press-fit terminals.
–Connector retention facilities.
–Code key system for connector coding.
–Flexible H11 PCB for mounting of the unit onto a PCB.
–Chassis mounting plates for mounting the 19" cassette to
a chassis/wall where only frontal access is given.
–Universal mounting bracket for DIN-rail or chassis moun-
ting.
For more detailed information please refer to
Accessory
Products
.
H11 female connector,
Code key system
Front panels
Flexible H11 PCB
Mounting plate,
Connector retention clips
Universal mounting bracket for DIN-rail mounting.
