RT8497

Copyright © 2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS8497-01

July

2015

2

Marking Information

RT8497

GSYMDNN

RT8497GS : Product Number

YMDNN : Date Code

RT8497GS

RT8497C

GSYMDNN

RT8497CGS : Product Number

YMDNN : Date Code

RT8497CGS

RT8497B

GSYMDNN

RT8497BGS : Product Number

YMDNN : Date Code

RT8497BGS

RT8497A

GSYMDNN

RT8497AGS : Product Number

YMDNN : Date Code

RT8497AGS

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

SGND

Ground of the Chip.

2

VC

Close Loop Compensation Node.

3

AND

Next Delay Timing Function Control.

4

SOURCE

Internal Power MOSFET Source Connection.

5, 6

DRAIN

Internal Power MOSFET Drain Connection.

7

NC

No Internal Connection.

8

VCC

Supply Voltage Input of the Chip. For good bypass, a ceramic capacitor near the

VCC pin is required.

Function Block Diagram

DRAIN

Regulator

SGND

AND

State

Machine

VCC

VC

A

EA

+

-

+

-

250mV

SOURCE

SOURCE

Operation

The RT8497 senses true average output current and

keeps the system driving constant output current. The

VC pin is the compensation node in this close loop

system and dominates the frequency response. To

stabilize the system and achieve better PFC / THDi,

proper selection of a compensation network is needed.