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Specifications subject to change without notice

VRB_D-20W＆VRA_D-20W

A/3-2008

Page 1 of 2

OUTPUT SPECIFICATIONS

OUTPUT VOLTAGE TRIM

Item

Test conditions

Min

Typ

Max

Units

Output voltage accuracy

Refer to recommended circuit

±1

±3

Load regulation

From 10% to 100% load

±0.5

±1

Line regulation

Input voltage from low to high

±0.2

±0.5

Cross regulation

±5

%

Ripple and noise

Tested under 20MHz brand

50

75

150

mV

Transient recovery time

200

300

us

+V0

Trim

0V

Trim up/d own

Trim

0V

Trim up

Trim

0V

Trim down

+Vo

Trim

Transient peak deviation

25%load change

±2

±5

%

RECOMMENDED CIRCUIT

Over load protection*

Input voltage range

120

130

150

%

Output Short Circuit

Hiccup, automatics recovery

3.3V

3.63

4.29

5V

5.5

6.5

12V

13.2

15.6

15V

16.5

19.5

Over voltage protection

24

26.4

31.2

VDC

Temperature drift (Vout)

0.02

%/℃

Trim

±10%Vo

VDC

DC

DC

Vin

GND

Vout

0V

Cin

Cout

L

For single output

DC

DC

Vin

GND

Vout

-Vo

Cin

Cout

L

-0V

Cout

For d ual o utput

Fig.1

In order to abtain better performance for

the DC/DC models. it

’s recommended that

use input and output filters as Fig.1 shown..

COMMON SPECIFICATIONS

DERATING & EFFICIENCY CURVE

Item

Test conditions

Min

Typ

Max

Units

Operating Temperature

-40

71

Storage Temperature

-55

105

Storage Humidity

5

95

℃

Isolation voltage

Test for 1 minute and 1 mA max

1500

VDC

Isolation resistance

500

M

Ω

Isolation Capacitance

100KHz / 1V

1000

pF

Switching frequency

Nominal, full load

300

KHz

MTBF

100

K hours

Case Material

Aluminous alloy

Weight

39

G

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.

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

F OO T PRIN T D ETAILS

P in

S ing le

1

4

3

6

5

2

Vin

Trim

C t rl

+ Vo

0V

G ND

3

2

1

4

5

6

50.80

45.72

35.00

2.54

(2.000)

(0.100)

(1.380)

( 1.800)

2.00 (0.080)

4

5

6

3

2

1

RE CO MM E N DE D FO OT PR I NT

d ia me te r :1 . 50 m m( 0 .0 5 9in ch)

N o te:

U n it :m m (i n ch)

P in se ct ion : 1 .0 0 m m( 0. 0 39 in ch)

P in se ct io n t o l er a nce s : 0 .05 m m(

0 . 0 02 in c h)

G e ne r al to le ra n c es:

0 . 2 5mm ( 0.0 1 0 in ch)

+

+

+

+

F ir st Angle Pr oj ection

7

7

7

N o p in

D ual

V in

G ND

C trl

Tr im

- Vo

C om

+ Vo

(B ottom View)

Temperature derating curve

Operati ng Temp( C)

o

Curve of Efficiency VS output load

VRA2412D-20W

EfficiencyVS Output load

0

10

20

30

40

50

60

70

80

90

100

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Out put %Io

EFF%

Curve of Efficiency VS input Voltage

VRA2412D-20W

Efficiency VS Input voltage

80

82

84

85

87

89

91

92

94

18

20

22

24

26

28

30

32

34

36

I npu t vol ta ge（V）

EFF%