URB2403LD-30WR3_15 Datasheet, PDF (4/8 Pages) MORNSUN Science& Technology Ltd. – DC/DC converter

DC/DC Converter
URB_LD-30WR3 Series
Design Reference
1. Typical application
All the DC/DC converters of this series are tested according to the recommended circuit (see Fig. 2) before delivery.
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.
Vin
+Vo
Vout(VDC)
Cout(µF)
Cin(µF)
Cin
GND
DC DC
Fig. 2
Cout
0V
3.3/5/9
12/15/24
220
100
100
2. EMC solution-recommended circuit
Parameter description
Vin
GND
FU SE
M OV
C0
①
LCM
C1
②
C Y1
Vin
+Vo
C2 ^DC/DC
GND
0V
C Y2
C3 _LOAD
Fig. 3
Notes: Part ① in the Fig. 3 is used for EMS test and part ② for EMI filtering;
selected based on needs.
Model
FUSE
MOV
C0
C, C2
C3
LCM
CY1, CY2
Vin:24V
Vin:48V
Choose according to actual input current
S14K35
S14K60
330µF/50V
330µF/100V
4.7µF/50V
2.2µF/100V
Refer to the Cout in Fig.2
1mH
1nF/2KV
EMC solution-recommended circuit PCB layout
Fig. 4
Note: the min. distance of the bonding pads between input & output isolation capacitors (CY1/CY2) shall be ≥ 2mm.
3. Application of Trim and calculation of Trim resistance
+Vot
+Vot
Calculation formula of Trim resistance:
R1
Vref ^R3
R2
RT
Tri m
R1
Vref ^R3
R2
RT
Tri m
0V
Trim up
0V
Trim down
Applied circuits of Trim (Part in broken line is the interior of models)
up: RT=
aR2
R2-a
-R3
down: RT=
aR1
R1-a
-R3
Vr e f
a= _{Vo’-Vref} R1
a= ^{Vo’-Vref}
Vr e f
R2
RT is Trim resistance
a is a self-defined parameter, with
no real meaning.
Vout(V)
R1(KΩ)
R2(KΩ)
R3(KΩ)
Vref(V)
3.3
4.801
2.87
12.4
1.25
5
2.883
2.87
10
2.5
9
7.500
2.87
15
2.5
12
11.000
2.87
15
2.5
15
14.494
2.87
15
2.5
24
24.872
2.87
17.8
2.5
4. It is not allowed to connect modules output in parallel to enlarge the power
5. For more information please find DC-DC converter application notes on www.mornsun-power.com
2015.08.12-A/2
Page 4 of 8
MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation