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LM25115

Secondary Side Post Regulator Controller

National ->Texas Instruments 

Connection Diagram

20172602

16-Lead TSSOP, LLP

See NS Package Numbers MTC16 and SDA16A

Ordering Information

Ordering Number

LM25115MT

LM25115MTX

LM25115SD

LM25115SDX

Package Type

TSSOP-16

TSSOP-16

LLP-16

LLP-16

NSC Package Drawing

MTC16

MTC16

SDA16A

SDA16A

Supplied As

92 Units Per Anti-Static Tube

2500 shipped as Tape & Reel

Available Soon

Available Soon

Pin Descriptions

Pin

Name

Description

Application Information

1

CS

Current Sense amplifier positive input A low inductance current sense resistor is connected between

CS and VOUT. Current limiting occurs when the differential

voltage between CS and VOUT exceeds 45mV (typical).

2

VOUT Current sense amplifier negative input Connected directly to the output voltage. The current sense

amplifier operates over a voltage range from 0V to 13.5V at the

VOUT pin.

3

AGND Analog ground

Connect directly to the power ground pin (PGND).

4

CO

Current limit output

For normal current limit operation, connect the CO pin to the

COMP pin. Leave this pin open to disable the current limit

function.

5

COMP Compensation. Error amplifier output

COMP pin pull-up is provided by an internal 300uA current

source.

6

FB

Feedback. Error amplifier inverting input Connected to the regulated output through the feedback resistor

divider and compensation components. The non-inverting input

of the error amplifier is internally connected to the SS pin.

7

SS

Soft-start control

An external capacitor and the equivalent impedance of an

internal resistor divider connected to the bandgap voltage

reference set the soft-start time. The steady state operating

voltage of the SS pin equal to 0.75V (typical).

8

RAMP PWM Ramp signal

An external capacitor connected to this pin sets the ramp slope

for the voltage mode PWM. The RAMP capacitor is charged

with a current that is proportional to current into the SYNC pin.

The capacitor is discharged at the end of every cycle by an

internal MOSFET.

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