SS26AAA Просмотр технического описания (PDF) - C and D TECHNOLOGIES

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SS26AAA

5 VDC INPUT, 3.3 VDC OUTPUT DC/DC CONVERTER

C and D TECHNOLOGIES 

Programming

To program the SS26 SuperSIPTM for Vout<3.3, connect

resistor across pins 8 (TRIM) and 1(Vo). For Vout>3.3, re-

sistor is connected across pins 8 and 4 (Gnd).

Table 2

Vout Resistor Value

1.8

576Ω

1.9

1.21k

2.0

1.96k

2.1

2.8k

2.2

3.83k

2.3

4.99k

2.4

6.49k

2.5

8.25k

2.6

10.7k

2.7

13.7k

Vout ResistorValue

2.8

18.2k

2.9

24.3k

3.0

34.8k

3.1

54.9k

3.2

110.0k

3.3

OPEN

3.4

66.5k

3.5

29.4k

3.6

18.2k

Transient Response

Operating conditions are as follows: Vin=5V, Vo=3.3V, Load

change from Io=0% to Io=100%, TA=25°C, Cin=0F, Co=µF.

Thermal Design Guide

Locate your operating current, read the junction temp

rise from the graph and add to your maximum ambient.

135°C is the maximum allowable operating junction tem-

perature. Test conditions: Device soldered into 4” x 4”

PCB, 2 sided with power and ground planes for heat con-

duction. Due to the difficulty in predicting the thermal

effects of airflow velocity and direction, and thermal con-

duction through ground planes it is important that the SS26

SuperSIPTM be evaluated thermally in each application.

For high ambient temperature/high current application

please request our Application Note 35-118-01, “Accurate

Measurements of SS26 SuperSIPTM Junction Tempera-

ture”, for further assistance.

Tj Rise vs. Io

(Junction Temp Rise vs. Output Current)

70

60

50

40

30

STILL

AIR

100LFM

300LFM

20

10

0

OUTPUT CURRENT - AMPS

Operating conditions are as follows: Vin=5V, Vo=3.3V, Load

change from Io=100% to Io=0%, TA=25°C, Cin=0F, Co=µF.

Efficiency

100

95

90

3.3V 25C

85

2.1V 25C

80

75

0.5

1.5

2.5

3.5

4.5

5.5

OUTPUT CURRENT AMPS

Vo=3.3V, Cout-Oµf, Vi=5V, Cin=100µf

SUPERSIP26 11/99 REV C

Page 3

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