LC-46XD1E (serv.man7). Major IC Informations - Sharp TV Service Manual (repair manual). Page 16

LC-46/52XD1E-RU

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Step Down Converter.

Step Down Converter

Pin No.

Pin Name

I/O

Pin Function

1

BS

I

High-Side Gate Drive Boost input.
BS supplies the drive for the high-side n-channel MOSFET switch.
Connect a 10nF or greater capacitor from SW to BS to power the high-side switch.

2

IN

I

Power input.
IN supplies the power to the IC,as well as the step-down converter switches.
Drive IN with a 4.75V to 15V power source.
Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
See input Capacitor.

3

SW

O

Power Switching Output. 
SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load.
Note that a capacitor is required from SW to BS to power the high-side switch.

4

GND

-

Ground.

5

FB

I

Feedback input.
FB senses the output voltage to regulate that voltage.
Drive FB with a resistive voltage divider from the output voltage. 
The feedback threshold is 1.22V.
See Setting the Output Voltage.

6

COMP

-

Compensation Node.
COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND to compensate the regulation control loop.
See Compensation.

7

EN

I

Enable input.
EN is a digital input that turns the regulator on or off.
Drive EN high to turn on the regulator,drive it low to turn it off.
For automatic startup,leave EN unconnected.

8

N/C

-

No Connect.

Pin No.

Pin Name

I/O

Pin Function

1

BS

I

High-Side Gate Drive Boost lnput.
BS supplies the drive for the high-side n-channel MOSFET Switch.
Connect a 4.7nF or greater capacitor from SW to BS to power the high side switch.         

2

IN

I

Power input.
IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 4.75V to 23V power  source.
Bypass IN to GND with a suitably  large capacitor to eliminate noise on the input to the IC.
See Input Capacitor.        

3

SW

O

Power Switching Output.
SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load.
Note that a capacitor is required from SW to BS to power the high-side switch.        

4

GND

-

Ground. (Note: Connect the exposed pad on backside to Pin4).         

5

FB

I

Feedback input.
FB senses the output voltage to regulate that voltage.
Drive FB with a resistive voltage divider from the output voltage.
The feedback threshold is 1.222V.
See  Setting the Output Voltage.     

6

COMP

I

Compensation Node.
COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND to compensate the regulation control loop.
In same cases,  an additional capacitor from COMP to GND is required.
See Compensation.        

7

EN

I

Enable input 
EN is a digital input that turns the regulator on or off.
Drive EN high to turn on the regulator, drive it low to tum it off .
For automatic startup, leave EN unconnected.        

8

SS

I

Soft Start Control input.
SS controls the soft start period.
Connect a capacitor from SS to GND to set the soft-start period.
A 0.1

μF capacitor sets the soft-start period to l0ms

To disable the soft-start featur CIeave SS unconnected.