LT3086 datasheet(3/6 Pages) LINER

3 / 6 page

dc1729af

DEMO MANUAL DC1729A

THERMAL IMAGE

An example thermal image shows the temperature distri-

bution on the board. The test is done in still air at room

temperature with 2.2W power dissipation in the LT3086.

This gives the IC case-to-ambient thermal resistance

θJA = 23°C/W on the demo board.

Figure 3. Temperature Rise at 2.2W Dissipation

The cable drop compensation on the DC1729A can be

turned on by placing R4 (RCDC) with a value which is gov-

erned by the following equation provided in the data sheet:

RCDC =

RMON •RSET

3000 •RWIRE

Pleasenotethatwhencabledropcompensationisactivated,

it also changes the power good threshold. R23 needs to

be the same value as R4 in order to keep the same output

voltage power good threshold at the load.

CABLE DROP COMPENSATION

POWER GOOD SETTING

The power good setting jumper JP2 on the DC1729A is

used for setting the power good threshold for the cor-

responding output voltages. JP2 needs to be configured

at the same position as JP1 for any specific output volt-

ages. For example, when JP1 is configured on 7 and 8 for

3.3VOUT, JP2 also needs to be configured on 7 and 8 for

the correct power good setting for 3.3VOUT.

LT3086 Datasheet(PDF) 3 Page - Linear Technology