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Dn

Sense

V = 12 V

I

ASIC

VC ORE

VC CI O

PTH12010L

1

10

4

5

6

2

3

9

Track

GND

7

Vadj

+

V 1 = 3.3 V

O

V 2 = 1.8 V

O

I2

O

R1

2k

R3

11 k0

R5

10 k0

R4

100 k

R2

130

W

C2

330 F

m

C4

330 F

m

C3

330 F

m

C6

0.68 F

m

C5

0.1 F

m

C1

330 F

m

+

+

PTH12020W

7

10

4

5

6

2

3

9

Track

V

I

V

I

V

O

V

O

GND

Inhibit

Inhibit

1

Adjust

+

TL7702B

V

CC

GND

SENSE

RESIN

REF

CT

RESET

RESET

8

7

2

1

3

5

6

4

+

8

8

Sense

REMOTE SENSE

PTH12010W, PTH12010L

SLTS205E–JUNE 2003–REVISED APRIL 2006

Figure 22. Application Circuit Demonstrating Prebias Startup

regulation performance of the module by allowing it to compensate for any IR voltage drop between its output

and the load. An IR drop is caused by the high output current flowing through the small amount of pin and trace

resistance.

standard application). If a sense pin is left open-circuit, an internal low-value resistor (15-Ω or less) connected

between the pin and and the output node, ensures the output remains in regulation.

This should be limited to a maximum of 0.3 V.

Note: The remote sense feature is not designed to compensate for the forward drop of non-inear or frequency

dependent components that may be placed in series with the converter output. Examples include OR-ing diodes,

filter inductors, ferrite beads, and fuses. When these components are enclosed by the remote sense connection

they are effectively placed inside the regulation control loop, which can adversely affect the stability of the

regulator.

22

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