LC-42RD2E (serv.man5). Major IC Informations - Sharp TV Service Manual (repair manual). Page 7

LC-42RD2E/S/RU

5 – 7

1

BS

I

Boot strap. This capacitor is needed to drive the power switch's gate above the supply voltage.
It is connected between the SW and BS pins to from a floating supply across the power switch driver.

2

IN

I

Supply Voltage. The MP1415 operates from a +4.75V to +18V unregulated 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.

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 fold back comparator low-
ers the oscillator frequency when the FB voltage is below 400mV.

6

COMP

I

Compensation. The node is the output of the output of the transconductance error amplifier and the input to 
the current comparator.

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.