MP4051—NON-ISOLATED OFFLINE LED CONTROLLER WITH ACTIVE PFC

MP4051 Rev. 1.01

www.MonolithicPower.com

13

1/21/2014

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© 2014 MPS. All Rights Reserved.

The OCP setting point can be calculated as:

⋅⋅

−

=

+

OCP2

PRI_ OCP

CS

D

OCP1

OCP2

R

IR

V

0.6V

RR

point.

For some applications, the inductor value is very

small, the minimal-off time feature could make

the system work in DCM at the zero-crossing of

the BUS voltage. To improve the OCP function in

Thermal Shut Down

To prevent from any lethal thermal damage,

when the inner temperature exceeds OTP

threshold, the MP4051 shuts down switching

cycle and latched until VCC drop below UVLO

and restart again.

Design Example

For the design example, please refer to MPS

application note AN0xx for the detailed design

procedure and information.