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50W/75W/100W, wide input voltage,
isolated ®ulated single output
DC-DC converter
Patent Protection RoHS
FEATURES
z
W
ide range o
f
input
v
oltage : 66-160V
zEfficiency up to 92%
zLow no-load power
zIsolation voltage 3000VDC
zOperating temperature range:-40℃~+100℃
zInput under-voltage protection, output
over-voltage, over-current, short circuit,
over-temperature protection
zInternational standard: 1/4 brick
zMeets requirements of UL60950 and railway
standard EN50155
URF1D_QB Series is a high performance product designed for the field of railway applications. Output power contains 50W/75W/100W, no
min. load requirement, wide input voltage 66-160VDC, which allows the base plate temperature up to 100 ℃. Further product feathers
include input under-voltage protection, output over-voltage protection, short circuit protection, over temperature protection, remote
control and compensated, output voltage regulation functions. Meets the EN50155 railway standard and UL/EN60950 safety standards.
Widely used in the railway system and associated equipment.
Selection Guide
Part No.
Input Voltage (VDC) Input Voltage (VDC) Efficiency (%, Typ)
@ Full Load
Max. Capacitive
Load(μF)
Nominal
(Range) Max.*Output
Voltage(VDC)
Output Current
(mA)(Max./Min.)
URF1D24QB-50W
110
(66-160) 170
24 2083/0 92 3000
URF1D24QB-50WH
URF1D24QB-75W 24 3125/0 92 3000
URF1D24QB-75WH
URF1D24QB-100W 24 4167/0 92 3000
URF1D24QB-100WH
Note: *Absolute maximum rating without damage on the converter, but it isn't recommended.
Input Specifications
Item Operating Conditions Min. Typ. Max. Unit
Input Current (no-load / full load) Nominal input
URF1D24QB-100W(H) -- 5/988 --
mA
URF1D24QB-75W(H) -- 5/741 --
URF1D24QB-50W(H) -- 5/494 --
Reflected Ripple Current Nominal input -- 50 --
Input Surge Voltage (1sec. max.) -0.7 -- 180
VDCStart-up Threshold Voltage -- -- 66
Under-voltage Shutdown Voltage -- 55 --
Start-up Time -- 25 -- mS
Input Filter Pi filter
Ctrl*
Module switch on Ctrl psuspended or connected to TTL high level (3.5-12VDC)
Module switch of
f
Ctrl connected to -Vin or low level (0-1.2VDC)
Input current when switched off -- 2 -- mA
Note: *
t
he voltage of Ctrl pin is relative
t
oinputpin-Vin.
Output Specifications
Item Operating Conditions Min. Typ. Max. Unit
Output Voltage Accuracy Nominal input,10%-100% load -- -- ±2
%Line Regulation Full load, the input voltage is from low to high -- -- ±0.3
Load Regulation Nominal input,10%-100% load -- -- ±0.5
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Transient Recovery Time 25% load step change -- 300 500 μs
Transient Response Deviation -- ±3 ±5 %
Temperature Drift Coefficient Full load -- -- ±0.03 %/℃
Ripple & Noise * 20MHz bandwidth -- 100 300 mVp-p
Output voltage Regulated range(Trim) -10 -- 10
%
Output voltage remote
compensation(Sense) -- -- 5
Output Over-voltage Protection
Input voltage range
110 -- 140 %Vo
Output Over-current Protection 110 130 180 %Io
Output Short circuit Protection Continuous
Note: * The measuring method of ripple and noise, please refer to Fig. 1 .
General Specifications
Item Operating Conditions Min. Typ. Max. Unit
Insulation
Voltage
Input-output
Input-output, with the test time of 1 minute
and the leak current less than 1mA
3000 -- --
VDCInput-case 1500 -- --
Output-case 1500 -- --
Insulation Resistance Input-output, insulation voltage 500VDC 1000 -- -- MΩ
Isolation Capacitance Input-output, 100KHz/0.1V -- 2200 -- pF
Switching Frequency PFM mode -- 220 -- KHz
MTBF MIL-HDBK-217F@25℃500 -- -- K hours
Environmental Specifications
Item Operating Conditions Min. Max. Unit
Base- Plate Temperature Range Within the operating temperature curve -40 100 ℃
Over-temperature Protection Base- Plate Temperature -- 115
Thermal
Resistance
URF1DxxQB-100W
Natural convection 10.7 --
℃/W
200LFM convection 6.0 --
400LFM convection 5.0 --
1000LFM convection 4.0 --
URF1DxxQB-100WH
Natural convection 5.1 --
200LFM convection 2.8 --
400LFM convection 2.2 --
1000LFM convection 1.8 --
Storage Humidity Non-condensing 5 95 %RH
Storage Temperature -55 125
℃
Lead Temperature Welding spot is 1.5mm away from the casing,
10 seconds -- 300
Cooling Test EN60068-2-1
Dry Heat EN60068-2-2
Damp heat EN60068-2-30
Shock and Vibration Test IEC/EN61373
Physical Specifications
Casing Material Black flame-retardant and heat-resistant plastic (UL94-V0)
Weight URF1D24QB-50W、URF1D24QB-75W、URF1D24QB-100W 46g (Typ.)
URF1D24QB-50WH、URF1D24QB-75WH、URF1D24QB-100WH 76g (Typ.)
Cooling method Natural convection or Forced convection
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EMC Specifications
Item Test Conditions Test Procedure
EMI Conducted Disturbance 150KHz-30MHz Class B (see Fig. 2 for recommended circuit) CISPR22/EN55022
Radiated Emission 30MHz-1GHz Class B (see Fig. 2 for recommended circuit) CISPR22/EN55022
EMS
Electrostatic Discharge Contact ±6KV, Air ±8KV perf.Criteria B IEC/EN61000-4-2
GB/T17626.2
Radiation Immunity 10V/m perf.Criteria A IEC/EN61000-4-3
GB/T17626.3
Conducted disturbance
Immunity 10Vr.m.s perf.Criteria A IEC/EN61000-4-6
GB/T17626.6
EFT ±2KV(5KHz, 100KHz)(see Fig. 2 for recommended circuit) perf.Criteria B IEC/EN61000-4-4
GB/T17626.4
Surge Immunity
±2KV(1.2μs/50μs2Ω), (see Fig. 2 for recommended circuit)
±4KV(1.2μs/50μs12Ω), (see Fig. 2 for recommended circuit) perf.Criteria B IEC/EN61000-4-5
GB/T17626.5
±1.8KV (5/50µs 5Ω), (see Fig. 2 for recommended circuit) perf.Criteria B EN50155
Immunities of short
interruption 100%-0%, 10ms (see Fig. 2 for recommended circuit) perf.Criteria B EN50155
Efficiency Curves
URF1D24QB-100W(H)
URF1D24QB-75W(H)
URF1D24QB-50W(H)
80
85
90
95
100
66 70 80 90 100 110 120 130 140 150 160
Efficiency(%)
Input Voltage(V)
Efficiency Vs input Voltage (Full Load)
URF1D24QB-100W(H)
URF1D24QB-75W(H)
URF1D24QB-50W(H)
60
65
70
75
80
85
90
95
100
5102030
4
05060708090100
Efficiency(%)
Output Current Percentage(%)
Efficiency Vs Output Load(
Vin=110V
)
Thermal Curves
0
20
40
60
80
100
120
-40 0 10 20 30 40 50 60 70 80 90 100
Output power(W)
A
mbient temperature(℃)
URF1D24QB-100W Thermal Curves (Vin=110V)
No Heatsink
Natural Convection
No Heatsink
200LFM
No Heatsink
400LFM
No Heatsink
1000LFM
0
20
40
60
80
100
120
-40 0 10 20 30 40 50 60 70 80 90 100
Output power(W)
Ambient temperature(℃)
URF1D24QB-100WH Thermal Curves (Vin=110V)
Heatsink
Natural Convection
Heatsink
200LFM
Heatsink
400LFM
Heatsink
1000LFM
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0
10
20
30
40
50
60
70
80
-40 0 10 20 30 40 50 60 70 80 90 100
Output power(W)
Ambient temperature(℃)
URF1D24QB-75W Thermal Curves (Vin=110V)
No Heatsink
Natural Convection
No Heatsink
200LFM
No Heatsink
400LFM
No Heatsink
1000LFM
0
10
20
30
40
50
60
70
80
-40 0 10 20 30 40 50 60 70 80 90 100
Output power(W)
Ambient temperature(℃)
URF1D24QB-75WH Thermal Curves (Vin=110V)
Heatsink
Natural Convection
Heatsink
200LFM
Heatsink
400LFM
Heatsink
1000LFM
0
10
20
30
40
50
60
-40 0 10 20 30 40 50 60 70 80 90 100
Output power(W)
Ambient temperature(℃)
URF1D24QB-50W Thermal Curves (Vin=110V)
No Heatsink
Natural Convection
No Heatsink
200LFM
No Heatsink
400LFM
No Heatsink
1000LFM
0
10
20
30
40
50
60
-40 0 10 20 30 40 50 60 70 80 90 100
Output power(W)
Ambient temperature(℃)
URF1D24QB-50WH Thermal Curves (Vin=110V)
Heatsink
Natural Convection
Heatsink
200LFM
Heatsink
400LFM
Heatsink
1000LFM
Sense of application and precautions
1.
W
hen Remote Sense is not used
0V
+Vo
sens e+
Trim
sens e-
+C
The lead as short as possible
Load
Short at pin root
Notes：
1) When remote sense is not used, make sure + Vo and Sense + are shorted, and that 0V and Sense- are shorted as well;
2) Keep
t
he patterns between +
V
o and Sense + and 0V and Sense- as short as possible.
A
void a looping pattern. I
f
noise enters
t
he loop,
t
he operation of
t
he
power module will become unstable.
2.
W
hen Remote Sense is used
0V
+Vo
sens e+
Trim
sens e-
A
s far as possible using the twisted pair
Load
+C
Notes:
1. Using remote sense with long wires may cause output voltage to become unstable. Consult us if long sensing wiring is necessary.
2. Sense patterns or wires should be as short as possible. If wires are used, use either twisted-pair or shielded wires.
3. Please Use
w
ide PCB
t
race o
r
a
t
hic
k
w
ires between
t
he power supply module and
t
he load,
t
he line voltage drop should be kept less
t
han 0.3V. Make sure
the power supply module's output voltage remains within the specified range.
4. The impedance of wires may cause the output the voltage oscillation or have a greater ripple, please do adequate assessments before using.
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Design Reference
1. Ripple & noise
All the URF1D_QB-100W series have been tested according to the following recommended test circuit before leaving the factory (see Figur
e
1).
0V
+Vo
25.4mm
51mm
C2 C3
C1
2.54mm 6.4mm
sens e+
Trim
sens e-
-Vin
Ctrl
+Vin
C0
DC
Input
33 u F 1u F 10 uF 22 0uF
Copper shee
t
Connect
Oscillograph Probe
(20MHz bandwidth)
Load
Fig. 1
2. Typical application
If don’t use our company’s EMC models, please make sure the input of at least 33uF electrolytic capacitor in parallel to suppress the
input terminal may produce surge voltage.
If it is required to further reduce input and output ripple, properly increase the input & output of additional capacitors Cin and Cout or
select capacitors of low equivalent impedance provided that the capacitance is no larger than the max. capacitive load of the
product.
DC DC
+Vin
-Vin
+V
o
0V
Cin
Cout
Output Voltage
Cout(μF) Cin(μF)
24V 220 100
3. EMC solution-module recommended circuit
+Vin
-Vin
FC-xxxD
DC/DC
CONVERTER
+Vo
0V
+Vo
-Vo
FUSE
+
C0
C1
C2
Fig. 2
C0 82uF/200V electrolytic capacitor
C1, C2 2200pF/400VAC capacitor
FC-xxxD recommended to use MORNSUN’s
FC-CX3D
FUSE
Due to the difference of the power
module input current, the fuse of the
recommended values, please refer to the
TechnicalManualforthepowermodule.
4. These applications are not supported for the follow models
+Vin
-Vin
FC-xxxD DC/DC
CONVERTER
+Vo
0V
+Vo
-Vo
FUSE +Vin
-Vin
+Vin
-Vin FC-xxxD DC/DC
CONVERTER
+Vo
0V
+Vo
-Vo
FUSE +Vin
-Vin
-Vin
+Vin
-Vin
FC-xxxD DC/DC
CONVERTER
+Vo
0V
+Vo
-Vo
FUSE +Vin
C
-Vin
Capacitive
Parameter
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5. Thermal design
The maximum operating temperature of base- plate TB is 100 ℃,aslongastheuser'sthermalsystemkeepsTB<100℃, the converter
can deliver its full rated power. A power derating curve can be calculated for any heatsink that is attached to the base-plate of the
converter. It is only necessary to determine the thermal resistance, Rth(B-A), of the chosen heatsink between the base-plate and the
ambient air for a given airflow rate. This information is usually available from the heatsink vendor. The following formula can the be used to
determine the maximum power the converter can dissipate for a given thermal condition if its base-plate is to be no higher than 100 ºC.
）（
℃
A-B
A
max
th
100
RT
Pdiss
−
=
(TAis ambient temperature)
The maximum load operating power of power supply module at a certain ambient temperature can be calculated by the power
dissipation, Formula is as follows:
)1
1
(
max
max
−
=
η
diss
P
Po
(
η
is converter efficiency)
Therefore, customers can according to the actual application to choose the right heatsink.
6. Application of Trim and calculation of Trim resistance
0V
R
2
R
1
R
3
V
ref
R
T
Tri m
+Vot
0V
R
2
R
1
R
3
V
ref
R
T
Tri m
+Vot
Trim up Tri m down
Applied circuits of Trim (Part in broken line is the interior of models)
Calculation formula of Trim resistance:
up: a=
V
ref
Vo’-Vref R
1
R=
T
aR
2
R-a
2
-R
3
down: a=
V
ref
Vo’-Vref R
2
R=
T
aR
1
R-a
1
-R
3
Note：Value for R1, R2, R3, and Vref refer to the above table 1. RT: Resistance of Trim. a: User-defined parameter, no actual meanings. Vo’: The trim up/down
voltage.
table 1
Vo
Parameter
24(VDC)
R1(KΩ)24.87
R2(KΩ)2.87
R3(KΩ)20
Vref(V) 2.5
7. The product does not support in parallel and hot-plug use
8. For more information please find the application notes on www.mornsun-power.com
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Dimensions and Recommended Layout (without heatsink)
Dimensions and Recommended Layout(with heatsink)
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Note
1. Packing Information please refer to 'Product Packing Information'. Packing bag number:58010113(without heatsink), 58010112(with
heatsink);
2. Recommended used in more
t
han 5% load, i
f
t
he load is lower
t
han 5%,
t
hen
t
he ripple inde
x
o
f
t
he product may exceed
t
he
specification, but does not affect the reliability of the product;
3. The max capacitive load should be tested within the input voltage range and under full load conditions;
4
.If
t
he customer
t
ests EMC, suggest
t
o
t
ake our EMC module FC-CX3D. If
t
he customer needs
t
o meet
t
he performance aspects of
t
he
surge, and don’t take our EMC module FC-CX3D, please make sure the surge residual voltage less than 180V, to ensure the reliability of
the product;
5. Recommends that customers plus silicone film or thermal grease between the module and the heatsink, In order to ensure good heat
dissipation;
6. Unless otherwise specified, data in this datasheet should be tested under the conditions of Ta=25℃, humidity<75% when inputting
nominal voltage and outputting rated load;
7. All index testing methods in this datasheet are based on our Company’s corporate standards;
8. The performance indexes of the product models listed in this datasheet are as above, but some indexes of non-standard model
products will exceed the above-mentioned requirements, and please directly contact our technicians for specific information;
9. We can provide product customization service;
10.Specifications of this product are subject to changes without prior notice.
Mornsun Guangzhou Science & Technology Co., Ltd.
Address: No. 5, Kehui St. 1, Kehui Development Center, Science Ave., Guangzhou Science City, Luogang District, Guangzhou, P. R. China
Tel: 86-20-38601850-8801 Fax: 86-20-38601272 E-mail: info@mornsun.cn
