16-May-07

Notes

1. For EN55022 Level B performance below -25 ºC, a 220 µF (24 VDC input), 47 µF (48 VDC input) electrolytic capacitor is required across the input of the converter.

JTA20

Application Notes

Mechanical Details

Models and Ratings

Input

Voltage

Maximum

Power

Overvoltage

Protection

Output V1

Output V2

Efficiency

Model

Number

V Nom

I Max

V Nom

I Max

9-36 VDC

13.2 W

3.9 V

3.3 V

4.00 A

78%

JTA2024S3V3

20.0 W

6.8 V

5.0 V

4.00 A

81%

JTA2024S05

20.0 W

15.0 V

12.0 V

1.67 A

83%

JTA2024S12

20.0 W

18.0 V

15.0 V

1.33 A

83%

JTA2024S15

20.0 W

6.8 V

5.0 V

2.00 A

-5.0 V

2.00 A

83%

JTA2024D01

20.0 W

15.0 V

12.0 V

0.83 A

-12.0 V

0.83 A

83%

JTA2024D02

20.0 W

18.0 V

15.0 V

0.67 A

-15.0 V

0.67 A

83%

JTA2024D03

18-75 VDC

13.2 W

3.9 V

3.3 V

4.00 A

78%

JTA2048S3V3

20.0 W

6.8 V

5.0 V

4.00 A

82%

JTA2048S05

20.0 W

15.0 V

12.0 V

1.67 A

84%

JTA2048S12

20.0 W

18.0 V

15.0 V

1.33 A

84%

JTA2048S15

20.0 W

6.8 V

5.0 V

2.00 A

-5.0 V

2.00 A

84%

JTA2048D01

20.0 W

15.0 V

12.0 V

0.83 A

-12.0 V

0.83 A

84%

JTA2048D02

20.0 W

18.0 V

15.0 V

0.67 A

-15.0 V

0.67 A

84%

JTA2048D03

All dimensions are in inches (mm)

Weight: 0.11 lb (50 g) approx.

Packaging Style: Copper case with non-conducting base

1.60 (40.6)

0.50

(12.7)

0.70

(17.8)

0.20

(5.1)

0.60

(15.2)

0.45

(11.43)

0.22

(5.6)

2.00

(50.8)

1.80

(45.7)

0.04 DIA

(1.0)

8

4

3

1

7

6

5

0.10

(2.5)

0.70

(17.8)

0.30

(7.6)

Bottom View

Derating Curve

Output Trim

12 W

10 W

8 W

6 W

4 W

2 W

0 W

-40

0

10

20

30

Ambient Temp ( ˚C)

40

50

60

70

80

90

100

17.5 W

15 W

12.5 W

10 W

7.5 W

5 W

2.5 W

0 W

-40

0

10

20

30

Ambient Temp ( ˚C)

40

50

60

70

80

90

100

24 W

20 W

16 W

12 W

8 W

4 W

0 W

-40

0

10

20

30

Ambient Temp ( ˚C)

40

50

60

70

80

90

100

A

B

PIN CONNECTIONS

Pin

Single Output

Dual Output

1

On/Off control

On/Off control

3

-Vin

-Vin

4

+Vin

+Vin

5

Trim

Trim

6

-Vout

-Vout

7

+Vout

Common

8

No pin

+Vout

OUTPUT TRIM

Model Number

R Trim Down (k )

R Trim Up (k )

3.3 V

(6.180 - (12.10 x

∆

Vo))/

∆

Vo

(3.484 - (7.511 x

∆

Vo))/

∆

Vo

5.0 V

(5.788 - (10.57 x

∆

Vo))/

∆

Vo

(5.788 - (8.250 x

∆

Vo))/

∆

Vo

12.0 V

(86.496 - (60.10 x

∆

Vo))/

∆

Vo

(19.763 - (14.366 x

∆

Vo))/

∆

Vo

15.0 V

(150.000 - (87.00 x

∆

Vo))/

∆

Vo

(25.585 - (14.516 x

∆

Vo))/

∆

Vo

±5.0 V

(430.000 - (120.00 x

∆

Vo))/

∆

Vo

(42.141 - (13.793 x

∆

Vo))/

∆

Vo

±12.0 V

(743.000 - (177.00 x

∆

Vo))/

∆

Vo

(56.644 - (17.647 x

∆

Vo))/

∆

Vo

±15.0 V

(68.296 - (48.10 x

∆

Vo))/

∆

Vo

(20.657 - (19.500 x

∆

Vo))/

∆

Vo

Note:

1.

∆

Vo is the change in the trimmed output voltage from the nominal output voltage.

Example: JTA2024S05 trimmed to 5.3 V

∆

Vo = 5.0 - 5.3 = 0.3 VDC

The equation is (5.788 - (8.25 x

∆

Vo))/

∆

Vo

The value of resistor = (5.788 - (8.25 x 0.3))/0.3 = 11.04 K

Connect the resistor between TRIM pin and -Vo pin.

Curve A: Convection cooling

100% load at +60 ˚C to 0% load at +100 ˚C

Curve B: 150 LFM airflow

100% load at +70 ˚C to 0% load at +100 ˚C