OUTPUT SPECIFICATIONS
OUTPUT VOLTAGE TRIM
Item
Test conditions
Min
Typ
±1
Max
±3
Units
%
+V0
Output voltage accuracy Refer to recommended circuit
From 10% to 100% load
Load regulation
±0.5
±0.2
±1
Trim
0V
Trim
0V
+Vo
Line regulation
Input voltage from low to high
±0.5
±5
Cross regulation
Trim
Ripple and noise
Tested under 20MHz brand
25%load change
50
75
200
±2
150
300
±5
mV
us
Trim up/down
Trim down
Trim up
Transient recovery time
Transient peak deviation
Over load protection*
Output Short Circuit
%
RECOMMENDED CIRCUIT
L
Input voltage range
%
Vout
0V
120
130
150
Vi n
Cout
Cin
DC
DC
Hiccup, automatics recovery
GND
Vin
3.3V
5V
3.63
5.5
4.29
6.5
For single output
L
Vout
-0V
Cout
Cout
Cin
Over voltage protection
VDC
12V
15V
24
13.2
16.5
26.4
15.6
19.5
31.2
DC
DC
-Vo
GND
For dual output
Fig.1
Temperature drift (Vout)
Trim
0.02
%/℃
In order to abtain better performance for
the DC/DC models. it’s recommended that
use input and output filters as Fig.1 shown..
±10%Vo
VDC
DERATING & EFFICIENCY CURVE
COMMON SPECIFICATIONS
Item
Test conditions
Min
-40
-55
5
Typ
Max
71
Units
Temperature derating curve
Operating Temperature
Storage Temperature
Storage Humidity
Isolation voltage
105
95
℃
Test for 1 minute and 1 mA max
1500
500
VDC
MΩ
Isolation resistance
Isolation Capacitance
Switching frequency
MTBF
100KHz / 1V
pF
1000
300
Nominal, full load
KHz
100
K hours
Operating Temp(oC)
Case Material
Weight
Aluminous alloy
39
G
Curve of Efficiency VS output load
VRA2412D-20W
Note:
1. All specifications are measured at TA=25°C, humidity<75%, nominal input voltage and rated output load
unless otherwise specified.
2. The CTRL control pin voltage is referenced to GND.
EFF%
Ef f i ci encyVS Out put l oad
100
90
80
70
60
50
40
30
20
10
0
3. Typical Eff value at nominal input voltage and full load.
4. Capacitor MAX load tested at nominal input voltage and constant resistive load.
5. Refer to the diagram of Output Voltage trim up/down for trim applications.
6. The products cannot be used in parallel and in plug and play.
OUTLINE DIMENSIONS & FOOTPRINT DETAILS
First Angle Projection
RE CO MM E NDED FO OTPRINT
Top view,g rid :2.5 4mm(0.1 inch),
dia me ter:1.50 mm(0 .059in ch )
(2.000)
(1.800)
0% 10% 20% 30% 40% 50% 60% 70% 80% 90%100%
Out put %I o
50.80
45.72
2.54
(0.100)
4
5
6
3
7
6
Curve of Efficiency VS input Voltage
VRA2412D-20W
2
1
1
2
(Bottom View)
EFF%
5
4
Ef f i ci e ncy VS I nput vol t age
3
94
92
91
89
87
85
84
82
80
7
(0.080)
2.00
F OOTPRINT DETAIL S
S ingl e
Vin
P in
1
Dual
V in
GND
Ctrl
Trim
-Vo
18
20
22
24
26
28
30
32
34
36
2
3
4
GND
Ctrl
Trim
0V
35.00
(1.380)
I nput vol t a ge（V）
No te:
Un it:mm (inch )
Pin se ction:1.00 mm(0.0 39in ch )
Pin se ction to lerances : 0 .05 mm(
5
6
7
Com
+ Vo
+
+
0.002in ch)
No pin
+Vo
+
+
G eneral tole ran ces: 0.25mm ( 0.01 0inch )
MORNSUN reserves the copyright
Specifications subject to change without notice
VRB_D-20W＆VRA_D-20W
A/3-2008
Page 1 of 2
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