PSC5A10-7LIRPCD [BEL]
DC-DC Regulated Power Supply Module, 1 Output;
| 型号： | PSC5A10-7LIRPCD |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output |
| 文件： | 总11页 (文件大小：237K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Industrial Environment
Switching Regulators, PCB & Chassis
PSC-Family
PSR: Positive Switching Regulators
PSC-Family
No input to output isolation
Single output of 5.1, 12, 15, 24 or 36 V DC/51...288 W
Input voltage up to 80 V DC
• High efficiency up to 96%
• Wide input voltage range
• Low input-to-output differential voltage
• Very good dynamic properties
• Input undervoltage cut-out
• External output voltage adjustment and inhibit
• Continuous no-load and short-circuit proof
• No derating
Safety according to IEC 950
C
Table of Contents
Page
Electrical Input and Output Data ............................... 4 - 58
Characteristics and Definitions.................................. 4 - 60
Description of Options............................................... 4 - 61
Mechanical Data ....................................................... 4 - 63
Type Key and Product Marking ................................. 4 - 63
Type Survey .............................................................. 4 - 53
Description ................................................................4 - 53
Safety and Installation Instructions ........................... 4 - 54
Standard Features .................................................... 4 - 55
Immunity to Environmental Conditions...................... 4 - 56
Electromagnetic Compatibility EMC.......................... 4 - 57
Type Survey
Table 1: Type survey
Nominal
output
voltage
Uo nom
Nominal
output
current
Io nom
Input
voltage
range
Nominal
input
voltage
Ui nom
Efficiency
Type
designation
Options
Superseded
old type
(phase-out)
1
Ui
η
5.1 V
5.1 V
12 V
15 V
24 V
36 V
12 A
10 A
8 A
7...40 V
8...80 V
20 V
40 V
83%
79%
90%
91%
94%
96%
PSC 5A12-7iR
PSC 5A10-7iR
PSC 128-7iR
PSC 158-7iR
PSC 248-7iR
PSC 368-7iR
-9, L, P, C, D
PSR 512-7
PSR 510-7
PSR 128-7
PSR 158-7
PSR 248-7
PSR 368-7
15...80 V
19...80 V
29...80 V
42...80 V
50 V
60 V
1See data ∆Uio min (min. differential voltage Ui – Uo)
Description
The PSC family of positive swiching regulators is designed
as power supply modules for electronic systems. Their ma-
jor 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.
Modules with input up to 80 V are specially designed for
secondary switched and battery driven applications.
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 (without option L) is greater than approx. 5 m. For long
connection lines the use of option L is recommended in or-
der to reduce superimposed interference voltages or cur-
rents and to prevent oscillation.
Edition 2/96 - © Melcher AG
4 - 53
MELCHER
The Power Partners.
PSC-Family
Switching Regulators, PCB & Chassis
Industrial Environment
Ii
Io
Vo+
Vi+
Input
Filter
L (option)
i
Control circuit
Ui
Uo
Ce
C (option)
R
G
Gi–
Go–
Fig. 1
Block diagram
D (option)
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).
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 nega-
tive path is internally interconnected!
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
Table 2: Insulation concept for SELV circuits
Nominal Minimum required grade Maximum Minimum required
Measures to achieve the
specified safety status
of the output circuit
Resulting safety
status of the
switching
mains
of isolation, to be
output
safety status of the
supply
provided by the AC-DC
voltage
front end output circuit
voltage front end, including mains from the
regulator output
circuit
(AC)
supplied battery charger front end
None
Battery supply completely
separated from mains
≤60 V
≤80 V
SELV battery circuit
None
SELV circuit
SELV circuit
Hazardous voltage battery Input fuse 1 and unearthed,
circuit 2 non operator-accessible case 2
Hazardous voltage battery Input fuse 1 and earthed output Earthed SELV
circuit
circuit 3 and earthed 3 or non
operator-accessible case
circuit
≤250 V
Basic
≤60 V
≤80 V
Earthed SELV circuit
ELV circuit
Earthed input circuit 3
SELV circuit
Input fuse 1 and
earthed output circuit 3
Earthed SELV
circuit
Hazardous voltage
secondary circuit
Input fuse 1 and earthed output Earthed SELV
circuit 3 and earthed 3 or non
operator-accessible case
circuit
Double or reinforced
≤60 V
≤80 V
SELV circuit
None
SELV circuit
Double or reinforced insu- Input fuse 1 and unearthed and SELV circuit
lated unearthed hazardous non operator-accessible case 2
voltage secondary circuit 2
1 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.
4 - 54
Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
Industrial Environment
Switching Regulators, PCB & Chassis
PSC-Family
Standards and Approvals
Cleaning Agents
All Melcher power supplies are subject to manufacturing
surveillance in accordance with ISO 9001 standards.
In order to avoid possible damage, any penetration of
cleaning fluids is to be prevented, since the power supplies
are not hermetically sealed.
All units are UL recognized as per UL 1950, UL 1012 and
CAN/CSA C22.2 No. 234-M90.
Protection Degree
The protection degree is defined by IP 20.
Standard Features
i Inhibit
Vo+
i
Vi+
Gi–
Note: With open i-input, output is enabled (Uo = on)
Iinh
The inhibit input allows the switching regulators to be disa-
bled via a control signal. In systems with several units, this
feature can be used, for example, to control the activation
sequence of the regulators by a logic signal (TTL, C-MOS,
etc.).
Uinh
Go–
An output voltage overshoot will not occur when the units
are switched on or off.
Fig. 2
Definition of Iinh and Uinh
Uo/Uo nom
1
I inh [mA]
5
4
3
2
0.1
t
t
0
tr
tf
U inh
U
U
1
U o on
U o off
1
0
0
U inh [V]
-20
-50
-30
-10
0
-40
10 20 30 40 50
Fig. 3
Output response as a function of inhibit signal
Fig. 4
Inhibit current Iinh versus inhibit voltage Uinh
Data
Table 3: Inhibit characteristics
Characteristics
Conditions
min
–50
+2.4
typ
max
+0.8
+50
Unit
Uinh
Inhibit input voltage to keep
regulator output voltage...
Uo = on
Uo = off
Ui min...Ui max
TC min...TC max
V DC
t r
Switch-on time after inhibit command
Switch-off time after inhibit command
Input current when inhibited
Ui = Ui nom
RL =Uo nom /Io nom
5
ms
t f
10
10
Ii off
Io = 0, Ui = Ui nom
mA
Edition 2/96 - © Melcher AG
4 - 55
MELCHER
The Power Partners.
PSC-Family
Switching Regulators, PCB & Chassis
Industrial Environment
Vo +
R External Output Voltage Adjustment
Note: With open R input, Uo = Uo nom
(For superseded PSR types, Uo = 1.08 • Uo nom
Uref
R2
.
4000 Ω
)
+
–
R
R-input and option P cannot be supported simultaneously.
The output voltage Uo can either be adjusted with an exter-
nal resistor (R1 or R2) or with an external voltage (Uex).The
adjustment range is 0...1.08 of Uo nom.The minimal differen-
tial voltage ∆Uio min between input and output should be
maintained (see data). Min. input = Undervoltage lock-out.
R1
G
Go –
Fig. 6
Voltage adjustment with external resistor R1 or R2 [Ω]
Vo +
U ref
b) Uo = 0...100% Uo nom, using R1 between R and G (Go-):
4000 Ω
R1
Uo ≈ Uo nom • ––––––––
R1 + 4000
4000 • Uo
R1 ≈ –––-––––
Uo nom - Uo
R
+
–
+
Uex
c) Uo = Uo nom...Uo max, using R2 between R and Vo+:
Uo max = Uo nom + 8%
G
Go –
R2
U ref
k = ––––––
Uo nom
Fig. 5
Uo ≈ Uref • ––––––––––––––––––
k • (R2 + 4000) – 4000
Voltage adjustment with Uex [V] between R and G (Go-):
Uo nom
Uref
Uo • (1-k)
k • Uo - Uref
a) Uo ≈ Uex • ––––––
(Uref = 2.5 V ±2%)
R2 ≈ 4000 • –––––––––
(Uref = 2.5 V ±2%)
Caution: To prevent damage Uex should not exceed
20 V, nor be negative.
All formulae give approximate values only.
Immunity to Environmental Conditions
Table 4: Mechanical stress
Test Method
Standard
Test Conditions
Status
Ca
Ea
Eb
Fc
Damp heat
steady state
DIN 40046 part
IEC 68-2-3
MIL-STD-810D section 507.2 Duration:
Temperature:
Relative humidity:
40 ±2 °C
%
56 days
Unit not
operating
93 +2/-3
Shock
(half-sinusoidal)
DIN 40046 part 7
IEC 68-2-27
MIL-STD-810D section 516.3 Number of bumps:
Acceleration amplitude:
Bump duration:
100 gn = 981 m/s2
6 ms
18 (3 each direction)
Unit
operating
Continuous shock DIN 40046 part 26
(half-sinusoidal)
Acceleration amplitude:
Bump duration:
40 gn = 392 m/s2
6 ms
6000 (1000 each direction)
Unit
operating
IEC 68-2-29
MIL-STD-810D section 516.3 Number of bumps:
Vibration
(sinusoidal)
DIN 40046 part 8
IEC 68-2-6
MIL-STD-810D section 514.3 Acceleration amplitude:
Test duration:
Frequency (1 Oct/min):
Max. vibration amplitude:
10...2000 Hz
Unit
operating
0.35 mm (10...60 Hz)
5 gn = 49 m/s2 (60...2000 Hz)
7.5 h (2.5 h each axis)
Fda Random vibration DIN 40046 part 23
Acceleration spectral density: 0.05 g2/Hz
Unit not
wide band
reproducibility high
IEC 68-2-35
Frequency band:
Acceleration magnitude:
Test duration:
20...500 Hz
4.9 grms
3 h (1 h each axis)
operating
Kb
Salt mist
cyclic
(sodium chloride
NaCl solution)
DIN 40046 part 105
IEC 68-2-52
Concentration:
Duration:
Storage:
Storage duration:
Number of cycles:
5% (30°C)
Unit not
operating
2 h per cycle
40°C, 93% rel. humidity
22 h per cycle
3
Table 5: Temperature specifications, valid for air pressure of 800...1200 hPa (800...1200 mbar)
Temperature
Standard -7
Option -9
Characteristics
Conditions
min
max
71
min
–40
–40
–55
max
71
Unit
TA
TC
TS
Ambient temperature 1
Ui min...Ui max
Io = 0...Io nom
–25
–25
–40
°C
Case temperature
Storage temperature 1
95
95
Not operational
100
100
1 MIL-STD-810D section 501.2 and 502.2
4 - 56
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Table 6: MTBF and device hours
MTBF
Ground Benign
TC = 40°C
Ground Fixed
Ground Mobile
TC = 50°C
Device Hours 1
MTBF acc. to MIL-HDBK-217F
TC = 40°C
143'000 h
TC = 70°C
660'000 h
81'000 h
68'000 h
2'800'000 h
1 Statistical values, based on an average of 4300 working hours per year and in general field use
Electromagnetic Compatibility EMC
Immunity
General condition: Case not earthed.
Table 7: Immunity type tests
Phenomenon
Standard
Class
Level
Coupling
mode4
Value
applied
Waveform
Source
Imped.
Test
procedure
In Per-
oper. form.
Impulse voltage IEC 255-4
III
i/o, i/c, o/c
+i/–i
5000 Vp
1.2/50 µs
500 Ω
3 pos. and 3 neg.
impulses per
coupling mode
no
yes
yes
-
App. E4 5
(1976)
1
High frequency IEC 255-4
III
i/o, i/c, o/c
+i/–i
2500 Vp
1000 Vp
400 damped
1 MHz waves/s
200 Ω
100 Ω
2 s per
coupling mode
disturbance
App. E5 5
(1976)
2
Voltage surge
IEC 571-1
(1990-07)
i/c, +i/–i
800 Vp
100 µs
50 µs
1500 Vp
1 pos. and 1 neg.
voltage surge per
coupling mode
3000 Vp
4000 Vp
7000 Vp
6000 Vp
5 µs
1 µs
100 ns
1/50 ns
1
6
Electrostatic
discharge
IEC 801-2
(1991-04)
3
contact discharge
to case
330 Ω
10 positive and
10 negative
discharges
yes
1
Electric field
IEC 801-3
(1984)
2
3
antenna in
1m distance
3 V/m sine wave mod-
ulated w. 1 kHz
26…1000 MHz
yes
yes
1
3
6
Fast transient/
burst
IEC 801-4
(1988)
i/c, +i/–i
2000 Vp bursts of 5/50 ns 50 Ω
5 kHz rep. rate
1 min positive
1 min negative
bursts per
transients with
15 ms burst
coupling mode
duration and a
300 ms period
2
6
Transient
IEC 801-5
(Draft 1993-01)
III
3
i/c
2000 Vp
1000 Vp
1.2/50 µs
12 Ω
2 Ω
5 pos. and 5 neg.
impulses per
coupling mode
yes
,
+i/–i
7
1
Immunity to
conducted
IEC 801-6
i, o, signal wires
10 Vrms
80% amplitude
modulated
50 Ω
AM 0.15...80 MHz yes
disturbancies
with 1 kHz
1 Normal operation, no deviation from specifications
2 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
4 - 57
MELCHER
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Electrical Input and Output Data
General Conditions
– TA = 25°C, unless TC is specified.
– With R or option P, output voltage Uo = Uo nom at Io nom
Table 8a: Input and output data
Characteristics
Conditions
PSC 5A12
PSC 5A10
PSC 128
Unit
min
5.07
12.0
typ
max
min
5.07
10.0
typ
max
min
11.92
8.0
typ
max
Output
Uo nom Output voltage
Io nom Output current
Ui nom, Io nom
5.13
5.13
12.07
V
A
Ui min...Ui max
TC min...TC max
12.0
10.0
8.0
IoL
Output current
limitation response
15.6
50
13.0
50
10.4
150
75
uo
Ripple at output
(BW = 20 MHz)
Ui nom
Io nom
35
30
35
30
80
50
mVpp
mV
∆Uo U Static control deviation Ui min...Ui max
45
45
versus input voltage Ui Io nom
∆Uo I Static control deviation Ui nom
20
25
20
25
30
35
versus output current Io Io = 0…Io nom
uo d
tr
Dynamic control
deviation 1
Ui nom
o nom ↔ 1/
Io nom
130
40
130
50
130
60
I
3
Dynamic load transient
time recovery 1
µs
αuo
Temperature coefficient Ui min...Ui max
±1
±1
±2
mV/K
%/K
∆Uo/∆TC
TC min...TC max
Io = 0...Io nom
±0.02
±0.02
±0.02
Input
Ui
Input voltage
Io = 0...Io nom
TC min...TC max
7
40
45
8
80
40
15
80
35
V DC
V
∆Uio min Minimum differential
2
3
3
2
voltage Ui - Uo
Ui o
Ii 0
Undervoltage cut-out
6.3
7.3
7.3
No load
input current
Io = 0
Ui min...Ui max
mA
A
Ii m
Peak value of
inrush current 3
Ui nom
150
250
250
ti s
ti r
Rise time 3
5
5
5
µs
Tail half value time 3
40
40
40
Ii m
Peak value of
inrush current 3
Ui nom
with option L
250
350
350
A
ti s
Rise time 3
25
25
25
µs
ti r
Tail half value time 3
125
125
125
ui rfi
RFI level at input, 4
0.01...30 MHz
VDE 0871 (6.78)
Uimin...max, Io nom
B
B
B
dB
(µV)
Efficiency
η
Efficiency
Ui nom, Io nom
83
79
90
%
Isolation
Uis
Isolation test voltage
electronics to case
Inputs/outputs
interconnected
750
750
750
V DC
1
2
See "Dynamic characteristics"
The minimum differential voltage ∆Uio min between input and output increases linearly from 0 to 1 V at TA = 46°C and 71°C
(TC = 70°C and 95°C)
Definitions according to VDE 0433, part 3
3
4
With option L and additional external input capacitor Ce = 120 µF/100 V, e.g. Nichicon, PF(M) series, or equivalent
4 - 58
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Table 8b: Input and output data
Characteristics
Conditions
PSC 158
PSC 248
PSC 368
Unit
min
14.91
8.0
typ
max
min
23.85
8.0
typ
max
min
35.78
8.0
typ
max
Output
Uo nom Output voltage
Io nom Output current
Ui nom, Io nom
15.09
24.14
36.22
V
A
Ui min...Ui max
TC min...TC max
8.0
8.0
8.0
IoL
Output current
limitation response
10.4
150
100
45
10.4
250
220
160
10.4
300
270
160
uo
Ripple at output
(BW = 20 MHz)
Ui nom
Io nom
80
70
100
150
120
150
80
150
200
125
220
100
mVpp
mV
∆Uo U Static control deviation Ui min...Ui max
versus input voltage Ui Io nom
∆Uo I Static control deviation Ui nom
35
versus output current Io Io = 0…Io nom
uo d
tr
Dynamic control
deviation 1
Ui nom
o nom ↔ 1/
Ionom
130
60
I
3
Dynamic load transient
time recovery 1
µs
αuo
Temperature coefficient Ui min...Ui max
±3
±5
±8
mV/K
%/K
∆Uo/∆TC
TC min...TC max
Io = 0...Io nom
±0.02
±0.02
±0.02
Input
Ui
Input voltage
Io = 0...Io nom
TC min...TC max
19
80
35
29
80
35
42
80
40
V DC
V
∆Uio min Minimum differential
4
5
6
2
voltage Ui - Uo
Ui o
Ii 0
Undervoltage cut-out
7.3
12
19
No load
input current
Io = 0
Ui min...Ui max
mA
A
Ii m
Peak value of
inrush current 3
Ui nom
250
250
250
ti s
ti r
Rise time 3
5
5
5
µs
Tail half value time 3
40
40
40
Ii m
Peak value of
inrush current 3
Ui nom
with option L
350
350
350
A
ti s
Rise time 3
25
25
25
µs
ti r
Tail half value time 3
125
125
125
ui rfi
RFI level at input, 4
0.01...30 MHz
VDE 0871 (6.78)
Uimin...max, Io nom
B
B
B
dB
(µV)
Efficiency
η
Efficiency
Ui nom, Io nom
91
94
96
%
Isolation
Uis
Isolation test voltage
electronics to case
Inputs/outputs
interconnected
750
750
750
V DC
1 See "Dynamic characteristics"
2 The minimum differential voltage ∆Uio min between input and output increases linearly from 0 to 1 V at TA = 46°C and 71°C
(TC = 70°C and 95°C)
3 Definitions according to VDE 0433, part 3
4 With option L and additional external input capacitor Ce = 120 µF/100 V, e.g. Nichicon, PF(M) series, or equivalent
Edition 2/96 - © Melcher AG
4 - 59
MELCHER
The Power Partners.
PSC-Family
Switching Regulators, PCB & Chassis
Industrial Environment
Characteristics and Definitions
Parallel and Series Connection
Output Protection
A voltage suppressor diode protects the output against an
internally generated overvoltage, which could occur due to
a failure of the control circuit, which in worst case condi-
tions fails into a short circuit. The suppressor diode is not
designed to withstand externally applied overvoltages. The
user should ensure that systems with Melcher power sup-
plies, in the event of a failure, do not result in an unsafe
condition (fail-safe).
Outputs of equal nominal voltages can be parallel-con-
nected. However, the use of a single unit with higher output
power, because of its power dissipation, is always a better
solution.
In parallel-connected operation, one or several outputs may
operate continuously at their current limit knee-point which
will cause an increase of the case temperature. Conse-
quently, the max. ambient temperature value should be re-
duced by 10 K.
Dynamic Characteristics
Outputs can be series-connected with any other module. In
series-connection the maximum output current is limited by
the lowest current limitation. Galvanically separated source
voltages are needed for each module!
Uo
uod
Uo I
Uo I
uod
Short circuit behaviour
tr
tr
A constant current limitation circuit holds the output current
almost constant whenever an overload or a short circuit is
applied to the regulator's output. It acts self-protecting and
recovers - in contrary to the fold back method - automati-
cally after removal of the overload or short circuit condition.
t
I /I
o
o nom
3/3
2/3
1/3
0
Uo/Uo nom
t
I
≥10 µs
≥10 µs
1.2
1.0
Fig. 7
0.8
Behaviour and characteristics under varying load condi-
Io L
tions.
0.6
0.4
0.2
Temperature
When a converter is located in free, quasi-stationary air at a
temperature TA = 71°C and is operated at its nominal output
power, the case temperature TC will be about 95°C after the
warm-up phase measured at the measuring point of case
temperature TC (see "Mechanical Data").
Io/Io nom
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Fig. 9
Overload, short-circuit behaviour Uo versus Io
Under practical operating conditions, the ambient tempera-
ture TA may exceed 71°C, provided additional measures
are taken to ensure that the case temperature TC does not
exceed its maximum value of 95°C ( heat sink, fan, etc.).
Example: Sufficient forced cooling allows TA max = 85°C. A
simple check of the case temperature TC (TC ≤ 95°C) at full
load ensures correct operation of the system
Po [%]
110
100
Po max (forced cooling)
Po max
90
80
70
60
50
40
30
20
10
0
(convection cooling)
TC max
TA [°C]
50
60
70
80
90
100
–40
Fig. 8
Output power derating versus ambient temperature
4 - 60
Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
Industrial Environment
Switching Regulators, PCB & Chassis
PSC-Family
Description of Options
Option -9 Extended Temperature Range
The operational ambient temperature range is extended to
TA = –40...71°C.
Option L Input filter
Option L is recommended to reduce superimposed inter-
ference voltages, and to prevent oscillations, if input lines
exceed approx. 5 m in total length. The fundamental wave
(approx. 120 kHz) of the reduced interference voltage be-
tween Vi+ and Gi– has, with an input line inductance of
With option L, the maximum permissible additionally super-
imposed ripple ui of the input voltage (rectifier mode) at a
specified input frequencyf i has the following values:
Input voltage up to 80 V:
ui max = 22 Vpp at 100 Hz or Vpp = 2200 Hz/fi • 1 V
Input voltage up to 40 V:
5 µH a maximum magnitude of 4 mVrms
.
The input impedance of the switching regulator at 120 kHz
is about 50 mΩ. The harmonics are small in comparison
with the fundamental wave. See also data: RFI.
ui max = 12 Vpp at 100 Hz or Vpp = 1200 Hz/fi • 1 V
Option P Potentiometer
Option P and the R-function cannot be supported simulta-
neously. The output voltage Uo can be adjusted with a
screwdriver in the range from 0.92…1.08 of the nominal
However, the minimum differential voltage ∆Ui o min between
input and output voltages as specified in "Electrical Input
and Output Data" should be maintained.
output voltage Uo nom
.
Option C Thyristor Crowbar
This option is recommended to protect the load against
power supply malfunction, but it is not designed to sink ex-
ternal currents.
Note: As a central overvoltage protection device, the crow-
bar is usually connected to the external load via distributed
inductance of the lines. For this reason, the overvoltage at
the load can temporarily exceed the trigger voltage Uo c
.
A fixed-value monitoring circuit checks the output voltage
Uo. When the trigger voltage Uoc is reached, the thyristor
crowbar triggers and disables the output. It may be deacti-
vated by removal of the input voltage. In case of a switching
transistor defect, an internal fuse prevents excess current.
Depending on the application, further decentralized over-
voltage protection elements may have to be used addition-
ally.
Table 9: Crowbar trigger levels
Characteristics
Conditions
5.1
12 V
15 V
min
16.5
24 V
min
27
36 V
max
Unit
min
5.8
max
6.8
min
13.5
max
16
max
19
max
31
min
40
Uo c Trigger voltage
Ui min...Ui max
Io = 0...Io nom
TC min...TC max
45.5
V
ts
Delay time
1.5
1.5
1.5
1.5
1.5
µs
Option U Ambient Temp. Range acc. UL Recognition
Underwriters Laboratories (UL) have approved the PSC
family as recognized components up to an ambient tem-
perature of TA max – 25 K given by the upper temperature
limit of the standard PCB material. If the full maximum am-
bient temperature TA max is required with UL approval, op-
tion U should be requested. It consists of an alternative
PCB material with a higher maximum temperature specifi-
cation.
The European approval boards have in contrast to UL ac-
cepted the standard PCB material to be operated up to
TA max = 71°C without any further precautions.
Edition 2/96 - © Melcher AG
4 - 61
MELCHER
The Power Partners.
PSC-Family
Switching Regulators, PCB & Chassis
Industrial Environment
Option D (“Save Data”, input undervoltage monitor)
Note: Output instead of input undervoltage monitor is
The voltage Ut can be externally adjusted with a trim poten-
tiometer by means of a screwdriver. The hysteresis UH of
Ut is <2%. Terminal D stays low for a minimum time
tlow min, in order to prevent any oscillation. Ut can be set to a
value between Ui min and Ui max. It is important to note that
the FET can become conductive again when UD > Ui – 3V.
available on request (Option D1).
If the input voltage Ui is below the adjustable threshold volt-
age Ut, the control circuit for terminal D has low impedance.
Terminal D and Go– are connected to a self-conducting
field effect transistor (FET). A 0.5 W Zener diode provides
protection against overvoltages.
UH
UD
UD high
10 kΩ
ID
D
8.2 V
Go –
Vi +
Gi –
+5 V
FET
Ut
UD
100 pF
UD low
Ui
Ut
Fig. 10
Fig. 11
Test circuit with definition of voltage UD and current ID on
Terminal D.
Definition of Ut and UH
Data
Table 10: Option D data
Characteristics
Conditions
PSC
Unit
min
typ
max
0.8
UD low
Voltage - Terminal D at low impedance
Ui < Ut, ID ≤ 2.5 mA
Ui > Ut + UH, ID > 25 µA
V
UD high Voltage - Terminal D at high impedance
4.75
tlow min
tD f
Minimum duration UD low
Response time to UD low
Maximum current - Terminal D
30
1
ms
µs
ID max
20
mA
Application examples
a) The signal UD can be utilized in battery powered systems to provide a warning in case of low batteries.
b) In case of power failure, the signal can serve to initiate data save routines.
4 - 62
Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
Industrial Environment
Switching Regulators, PCB & Chassis
PSC-Family
Mechanical Data
Dimensions in mm.Tolerances ±0.3 mm unless otherwise specified.
European
Projection
LED-output
Potentiometer
(option D)
Potentiometer
(option P)
voltage indicator
Ut
Uo
R
Gi–
D
G
Go–
Vo+
Vi+
U
i
o
151 ±1
Distance between M4 mounting screws
144
5 ±0.5
Measuring point
of case temperature
T
C
11.3
40
18.5
Fig. 12
Case C03 (weight 440 g)
12.5 ±1
7.5
10 7.5 10
(14)
7.5
27.5
7.5
Type Key and Product Marking
Type Key
PSC 12 8 -7 L i R P C D
Positive switching regulator in case C03 .................... PSC
Blank ..................................................................................
Nominal output voltage in volt (5A –> 5.1) ............. 5.1...36
Nominal output current in ampere............................. 8...12
Ambient temperature range
TA = –25...71°C ................................................... -7
TA = –40...71°C ................................................... -9
Input filter ......................................................................... L
Inhibit input........................................................................ i
External output voltage adjustment................................. R
Potentiometer...................................................................P
Thyristor-Crowbar ........................................................... C
"Save Data" undervoltage monitor .................................. D
Example:PSC 128-7LiPC = A positive switching regulator with a 12 V, 8 A output, ambient temperature range of
–25…71°C, input filter, inhibit input, potentiometer and thyristor-crowbar.
Produkt Marking
Main face: Family designation, applicable safety approval and recognition marks, warnings, Melcher patent nos. and com-
pany logo.
Cover:
Specific type designation, input voltage range, nominal output voltage and current, pin allocation, identification
of LED, potentiometers and degree of protection.
Rear side: Label with batch no., serial no. and data code comprising production site, modification status of the main PCB
and date of production.
Edition 2/96 - © Melcher AG
4 - 63
MELCHER
The Power Partners.
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