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LT3090 Datasheet(PDF) 3 Page - Linear Technology

Part No. LT3090
Description  –36V, 600mA Negative Linear Regulator with Programmable Current Limit
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com

LT3090 Datasheet(HTML) 3 Page - Linear Technology

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positive or negative current monitor configuration
cable Drop compensation configuration
Figure 5. Temperature Rise at 2.1W Dissipation
There are both positive and negative current monitors on
the LT3090. The configurations for these two monitors are
different. When the positive current monitor is in use, JP1
needs to be configured on IMP position and JP3 needs to
be configured on +3V position. Meantime a +3V external
shows this configuration.
When the negative current monitor is in use, JP1 needs
to be configured on VIN position and JP3 needs to be
configured on IMN position. There is no external power
supply needed. Figure 4 shows this configuration.
thermal image
Figure 3. Positive Current Monitor Configuration
Figure 4. Negative Current Monitor Configuration
Demo Circuit 1948A can be configured to evaluate the
cable drop compensation on the LT3090. Note that cable
drop compensation is only using negative current monitor
configuration. JP1, JP3 and R12 shall be configured. JP1
needs to be configured on VIN position. JP3 needs to be
configured on CDC position. R12 needs be replaced by a
calculated value which has the following relationship with
the total output cable impedance (RCBL) below. R12 and
RCBL are both in kΩ:
R12 = RCBL • 1k
An example thermal image shows the temperature distri-
bution on board. The test is complete in still air at room
temperature with 2.1W power dissipation in the LT3090.
This gives the IC case-to-ambient thermal resistance of
θJA = 24°C/W on the demo board.

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