NSR-Family
Switching Regulators, PCB & Chassis
Industrial Environment
NSR: Negative Switching Regulators
No input to output isolation
Single output of –5 to –36 V DC/50...288 W
Input voltage up to –80 V DC
•
High efficiency up to 94 %
•
Wide input voltage range
•
Low input-to-ouptut differential voltage
•
Very good dynamic properties
•
•
•
•
Input undervoltage cut-out
Parallel configurations possible
Continuous no-load and short-circuit proof
No derating
NSR-Family
Case C03
4.2
Safety according to IEC 950
C
Table of Contents
Page
Electrical Input and Output Data ............................... 4 - 78
Characteristics and Definitions .................................. 4 - 80
Description of Options ............................................... 4 - 81
Mechanical Data ....................................................... 4 - 83
Type Key and Product Marking ................................. 4 - 83
Type Survey .............................................................. 4 - 74
Description ................................................................ 4 - 74
Safety and Installation Instructions ........................... 4 - 75
Immunity to Environmental Conditions ...................... 4 - 76
Electromagnetic Compatibility EMC .......................... 4 - 77
Type Survey
Table 1: Type survey
Nominal
output
voltage
U
o nom
–5 V
–5 V
–12 V
–15 V
–24 V
–36 V
1
Nominal
output
current
I
o nom
12 A
10 A
8A
Input
voltage
range
U
i 1
–7...–40 V
–8...–80 V
–15...–80 V
–19...–80 V
–29...–80 V
–42...–80 V
Nominal
input
voltage
U
i nom
–20 V
–40 V
Efficiency
Type
designation
Options
η
81%
70%
89%
89%
NSR 512-7
NSR 510-7
NSR 128-7
NSR 158-7
NSR 248-7
NSR 368-7
-9, L, i, P, R
-9, L, i, P, R, C
–50 V
–60 V
91%
94%
See also data
∆
U
io min
. (Minimum differential voltage
U
i
–
U
o
)
Description
The NSR family of negative switching regulators is desig-
ned as power supply modules for electronic systems. Their
major advantages include a high level of efficiency that re-
mains virtually constant over the entire input range, high
reliability, low ripple and excellent dynamic response.
The modules are specially designed for secondary
switched and battery driven applications with positive sys-
tem ground.
Case C03: Aluminium, black finish and self cooling.
External input circuitry
An external capacitor (see "Application Notes") is required
in rectifier mode and in DC operation mode only, if the sum
of the lengths of the two input lines between source and in-
put is greater than approx. 5 m. For long connection lines
the use of option L is recommended in order to reduce su-
perimposed interference voltages or currents and to pre-
vent oscillation.
4 - 74
MELCHER
The Power Partners.
Edition 2/96 - © Melcher AG
Industrial Environment
Gi+
Switching Regulators, PCB & Chassis
NSR-Family
Go+
–U
i
C
e
Input
Filter
L (opt.)
Vi–
Control circuit
C (opt.)
–U
o
I
i
Vo–
i (option)
R (option)
I
o
Fig. 1
Block Diagram
P (option)
Safety and Installation Instructions
Safety
If the output circuit of a switching regulator is operator-ac-
cessible according to the IEC 950 related safety standards,
it shall be an SELV circuit (Safety Extra Low Voltage circuit,
i.e. a circuit, separated from mains by at least basic insula-
tion, that is so designed and protected that under normal
and single fault conditions, the voltage between any two
conductors and between any conductor and earth does not
exceed 60 V DC).
In the following section an interpretation is provided of the
IEC 950 safety standard with respect to the safety status of
the output circuit. However, it is the sole responsibility of the
installer or user to assure the compliance with the relevant
and applicable safety standards.
If the following table is observed, the output of any switch-
ing regulator is considered to be an SELV circuit up to a
nominal output voltage of 36 V.
Note:
Check for hazardous voltages before altering
any connections. Do not open the module. The input
and the output circuitry are not separated, i.e. the posi-
tive path is internally interconnected!
Table 2: Insulation concept for SELV circuits
Nominal
mains
supply
voltage
(AC)
None
Minimum required grade
of isolation, to be
provided by the AC-DC
front end, including mains
supplied battery charger
Battery supply completely
separated from mains
Maximum
output
voltage
from the
front end
≤60
V
≤80
V
Minimum required
safety status of the
front end output circuit
Measures to achieve the
specified safety status
of the output circuit
Resulting safety
status of the
switching
regulator output
circuit
SELV circuit
SELV battery circuit
Hazardous voltage battery
circuit
2
Hazardous voltage battery
circuit
None
Input fuse
1
and unearthed,
SELV circuit
2
non operator-accessible case
Input fuse
1
and earthed output Earthed SELV
circuit
3
and earthed
3
or non
circuit
operator-accessible case
Earthed input circuit
3
Input fuse
1
and
earthed output circuit
3
SELV circuit
Earthed SELV
circuit
≤250
V
Basic
≤60
V
Earthed SELV circuit
ELV circuit
≤80
V
Hazardous voltage
secondary circuit
SELV circuit
Input fuse
1
and earthed output Earthed SELV
circuit
3
and earthed
3
or non
circuit
operator-accessible case
None
SELV circuit
Double or reinforced
≤60
V
≤80
V
Double or reinforced insu- Input fuse
1
and unearthed and SELV circuit
lated unearthed hazardous non operator-accessible case
2
voltage secondary circuit
2
The installer shall provide an approved fuse (slow blow type with lowest rating suitable for the application, max. 12.5 A) in the positive
or negative input conductor directly at the input of the switching regulator. For UL's purpose, the fuse needs to be UL-listed. If option
C is fitted, a suitable fuse is built-in.
2
Has to be insulated from earth by double or reinforced insulation according to the relevant safety standard, based on the maximum in-
put voltage of the switching regulator.
3
The earth connection has to be provided by the installer according to the relevant safety standards, e.g. IEC 950.
Edition 2/96 - © Melcher AG
1
MELCHER
The Power Partners.
4 - 75
4.2
NSR-Family
Switching Regulators, PCB & Chassis
Industrial Environment
Standards and Approvals
All Melcher power supplies are subject to manufacturing
surveillance in accordance with ISO 9001 standards.
All units are UL recognized as per UL 1950, UL 1012 and
CAN/CSA C22.2 No. 234-M90.
Cleaning Agents
In order to avoid possible damage, any penetration of
cleaning fluids is to be prevented, since the power supplies
are not hermetically sealed.
Protection Degree
The protection degree is defined by IP 40. With option P
this reduces to IP 20.
Immunity to Environmental Conditions
Table 3: Mechanical stress
Test Method
Standard
DIN 40046 part
IEC 68-2-3
MIL-STD-810D section 507.2
DIN 40046 part 7
IEC 68-2-27
MIL-STD-810D section 516.3
DIN 40046 part 26
IEC 68-2-29
MIL-STD-810D section 516.3
DIN 40046 part 8
IEC 68-2-6
MIL-STD-810D section 514.3
Test Conditions
Temperature:
Relative humidity:
Duration:
Acceleration amplitude:
Bump duration:
Number of bumps:
Acceleration amplitude:
Bump duration:
Number of bumps:
Frequency (1 Oct/min):
Max. vibration amplitude:
Acceleration amplitude:
Test duration:
Acceleration spectral density:
Frequency band:
Acceleration magnitude:
Test duration:
Concentration:
Duration:
Storage:
Storage duration:
Number of cycles:
40
±2
°C
93
+2/-3
%
56 days
100 g
n
= 981 m/s
2
6 ms
18 (3 each direction)
40 g
n
= 392 m/s
2
6 ms
6000 (1000 each direction)
10...2000 Hz
0.35 mm (10...60 Hz)
5 g
n
= 49 m/s
2
(60...2000 Hz)
7.5 h (2.5 h each axis)
0.05 g
2
/Hz
20...500 Hz
4.9 g
rms
3 h (1 h each axis)
5% (30°C)
2 h per cycle
40°C, 93% rel. humidity
22 h per cycle
3
Status
Unit not
operating
Unit
operating
Unit
operating
Unit
operating
Ca
Damp heat
steady state
Shock
(half-sinusoidal)
Continuous shock
(half-sinusoidal)
Vibration
(sinusoidal)
4.2
Ea
Eb
Fc
Fda
Random vibration DIN 40046 part 23
wide band
IEC 68-2-35
reproducibility high
Salt mist
cyclic
(sodium chloride
NaCl solution)
DIN 40046 part 105
IEC 68-2-52
Unit not
operating
Kb
Unit not
operating
Table 4: Temperature specifications, valid for air pressure of 800...1200 hPa (800...1200 mbar)
Temperature
Characteristics
Conditions
Standard -7
min
max
–25
–25
–40
71
95
100
Option -9
min
–40
–40
–55
max
71
95
100
Unit
°C
T
A
T
C
T
S
1
Ambient temperature
1
Case temperature
Storage temperature
1
U
i min
...U
i max
I
o
= 0...
I
o nom
Not operational
MIL-STD-810D section 501.2 and 502.2
Table 5: MTBF and device hours
MTBF
MTBF acc. to MIL-HDBK-217D
Ground Fixed
Ground Mobile
Device Hours
1
T
C
= 40
°C
130'000 h
T
C
= 70°C
58'000 h
T
C
= 40°C
36'000 h
T
C
= 70°C
17'000 h
1'050'000 h
1
Statistical values , based on an average of 4300 working hours per year and in general field use
4 - 76
MELCHER
The Power Partners.
Edition 2/96 - © Melcher AG
Industrial Environment
Switching Regulators, PCB & Chassis
NSR-Family
Electromagnetic Compatibility EMC
Immunity
General condition: Case not earthed
Table 6: Immunity type tests
Phenomenon
Impulse voltage
Standard
IEC 255-4
App. E4
5
(1976)
IEC 255-4
App. E5
5
(1976)
IEC 801-2
(1991-04)
IEC 801-3
(1984)
IEC 801-4
(1988)
Class
Level
III
Coupling
mode
4
i/o, i/c, o/c
+i/–i
i/o, i/c, o/c
+i/–i
3
contact discharge
to case
antenna in
1m distance
i/c
Value
applied
5000 V
p
Waveform
1.2/50
µs
Source
Imped.
500
Ω
Test
procedure
3 pos. and 3 neg.
impulses per
coupling mode
2 s per
coupling mode
10 positive and
10 negative
discharges
26…1000 MHz
50
Ω
1 min positive
1 min negative
bursts per
coupling mode
In Per-
oper. form.
no
-
High frequency
disturbance
Electrostatic
discharge
Electric field
Fast transient/
burst
III
2500 V
p
1000 V
p
6000 V
p
400 damped
1 MHz waves/s
1/50 ns
200
Ω
yes
1
2
2
3 V/m
sine wave mod-
ulated w. 1 kHz
yes
yes
1
1000 V
p
bursts of 5/50 ns
5 kHz rep. rate
transients with
15 ms burst
duration and a
300 ms period
1000 V
p
500 V
p
3 V
r ms 7
80% amplitude
modulated
with 1 kHz
1.2/50
µs
2 6
Transient
IEC 801-5
(Draft 1993-01)
IEC 801-6
II
i/c
+i/–i
12
Ω
2
Ω
50
Ω
5 pos. and 5 neg.
impulses per
coupling mode
AM 0.15...80 MHz
yes
2 6
Immunity to
conducted
disturbancies
1
2
2
i, o, signal wires
yes
1
Normal operation, no deviation from specifications
Normal operation, temporary deviation from specs possible
3
With option C: manual reset
4
i = input, o = output, c = case
5
In correspondance with DIN 57435 part 303 and VDE 0435 part 303 (1984-09)
6
Option L neccessary
7
Open circuit
Emission
For emission levels refer to "Electrical Input and Output
Data".
Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
4 - 77
4.2
330
Ω
yes
1 6
NSR-Family
Switching Regulators, PCB & Chassis
Industrial Environment
Electrical Input and Output Data
General Conditions
–
T
A
= 25°C, unless
T
C
is specified.
– With option P or R, output voltage
U
o
=
U
o nom
at
I
o nom
Table 7a: Input and output data
Characteristics
Output
Conditions
NSR 512
min
typ
max
NSR 510
min
typ
max
NSR 128
min
typ
max
Unit
U
o
I
o nom
I
oL
u
o
Output voltage
Output current
Output current
limitation response
Ripple at output
(BW = 20 MHz)
U
i nom
,
I
o nom
U
i min
...
U
i max
T
C min
...T
C max
–4.97
12.0
12.0
35
60
30
20
135
40
–5.03
–4.97
10.0
–5.03
–11.92
8.0
–12.07
V
A
15.6
50
85
1
45
55
1
25
10.0
35
60
30
20
130
50
13.0
50
85
1
45
25
8.0
80
50
28
130
60
10.4
150
85
35
55
1
mV
pp
mV
4.2
U
i nom
I
o nom
∆
U
o U
∆
U
o I
Static control deviation
U
i min
...
U
i max
versus input voltage
U
i
I
o nom
Static control deviation
U
i nom
versus output current
I
o
I
o
= 0…I
o nom
Dynamic control
deviation
2
Dynamic load transient
time recovery
2
Temperature coefficient
U
i min
...
U
i max
∆
U
o
/∆T
C
T
C min
...T
C max
I
o
= 0...I
o nom
u
o d
t
r
α
uo
U
i nom
I
o nom
↔
1
/
3
I
o nom
µs
±2
±0.02
mV/K
%/K
±1
±0.02
±1
±0.02
Input
U
i
Input voltage
I
o
= 0...I
o nom
T
C min
...T
C max
–7
–2
–6.3
–40
–8
–3
–7.3
–80
–15
–3
–7.3
–80
V DC
V
∆
U
io min
Minimum differential
voltage
U
i
-
U
o 3
U
i o
I
i 0
I
i m
t
i s
t
i r
I
i m
t
i s
t
i r
u
i rfi
Undervoltage cut-out
No load
input current
Peak value of
inrush current
Rise time
4
4
I
o
= 0
U
i min
...
U
i max
U
i nom
150
5
40
45
250
5
40
350
25
125
A
40
250
5
40
350
25
125
A
35
mA
A
µs
Tail half value time
4
Peak value of
inrush current
Rise time
4
4
U
i nom
with option L
250
25
125
A
µs
Tail half value time
4
RFI level at input,
0.01...30 MHz
VDE 0871 (6.78)
U
i nom
,
I
o nom
A
dB
(µV)
Efficiency
η
Efficiency
U
i nom
,
I
o nom
Inputs/outputs
interconnected
81
76
88
%
Isolation
U
is
1
2
3
4
Isolation test voltage
electronics to case
500
500
500
V DC
Lower row represents option -9 data only
See “Dynamic Characteristics”
The minimum differential voltage
∆
U
io min
between input and output increases linearly from 0 to 1 V at
T
A
= 46°C and 71°C
(T
C
= 70°C and 95°C)
Definitions according to VDE 0433, part 3
4 - 78
MELCHER
The Power Partners.
Edition 2/96 - © Melcher AG
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