URB1D03LD-15W Datasheet, PDF (7/8 Pages) MORNSUN Science& Technology Ltd. – REGULATED SINGLE OUTPUT DC-DC CONVERTER

PACKAGE DIAGRAM
Special Package Series（A2S/A4S）
TEST CONFIGURATIONS
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate source impedance.
Oscilloscope
Lin
DC DC ^Current
Cin ^Probe
Load
Lin(4.7µH) Cin(220µF, ESR < 1.0Ω at 100 KHz)
TRIM APPLICATION & TRIM RESISTANCE
Application circuit for TRIM (Part in broken line is the interior of models)
+Vo
+Vo
R1
R3
Vref
R2
RT
Trim
R1
R3
Vref
R2
RT
Trim
0V
0V
Formula for resistance of Trim
Trim up
up: RT =
down: RT=
Note:Trim Hung up when not in use;
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.
a R2 _-R3
R2 - a
a R1
R1-a ^-R3
(Table 1)
Trim down
Vref
a= _{Vo’-Vref} R1
Vo ’- Vr e f
a=
R2
Vr e f
Vo
Parameter
R1(KΩ)
R2(KΩ)
R3(KΩ)
Vref(V)
3.3(VDC)
4.801
2.864
15
1.24
5(VDC)
2.883
2.864
10
2.5
12(VDC)
10.971
2.864
17.8
2.5
15(VDC)
14.497
2.864
17.8
2.5
24(VDC)
24.872
2.863
17.8
2.5
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URB1D_LD-15W & URB1D_LD-20W
2013.11.14-A/1 Page 7 of 8