LC-19A1E (serv.man5). Major IC Informations - Sharp TV Service Manual (repair manual). Page 25

LC-19A1E-BK/WH

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1

BS

I

Bootstrap.
This capacitor (C5) is needed to drive the power switch's gate above the supply voltage.
It is connected between the SW and BS pins to form a floating supply across the power switch driver.
The voltage across C5 is about 5V and is supplied by the internal +5V supply when the SW pin voltage is low.

2

IN

I

Supply Voltage.
The MP1415E-C100 operates from a +4.75V to +18V unregulated input.
C1 is needed to prevent large voltage spikes from appearing at the input.

3

SW

O

Switch.
This connects the inductor to either IN through M1 or to GND through M2.

4

GND

-

Ground.
This pin is the voltage reference for the regulated output voltage.
For this reason care must be taken in its layout.
This node should be placed outside of the D1 to C1 ground path to prevent switching current spikes from inducing 
voltage noise into the part.

5

FB

I

Feedback.
An external resistor divider from the output to GND, tapped to the FB pin, sets the output voltage.
To prevent current limit runaway during a short circuit fault condition the frequency foldback comparator lowers the 
oscillator frequency when the FB voltage is below 400mV.

6

COMP

-

Compensation.
This node is the output of the transconductance error amplifier and the input to the current comparator.
Frequency compensation is done at this node by connecting a series R-C to ground.
See the compensation section for exact details.

7

EN

I

Enable/UVLO.
A voltage greater than 2.62V enables operation.
Leave EN unconnected if unused.
An under voltage lockout (UVLO) function can be implemented by the addition of a resistor divider from VIN to GND.
For complete low current shutdown the EN pin voltage needs to be less than 700mV

8

SS

-

Soft-Start.
Connect SS to an external capacitor to program the soft-start.
If unused, leave it open.
open.