MP020A-5 datasheet(13/21 Pages) MPS

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MP020A-5 – OFFLINE, PRIMARY-SIDE REGULATOR W/ CC/CV CONTROL AND 700V MOSFET

MP020A-5 Rev. 1.0

www.MonolithicPower.com

6/23/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

Output Cable Compensation

To compensate for the secondary-side cable

voltage drop for a more precise output voltage,

the MP020A-5 has an internal output cable

compensation

circuit

(see

Figure

5).

The

internal ZCD sample can detect the duty of the

secondary-side diode. A low-pass filter converts

the duty signal to a DC voltage (VCP) that

changes as the load current varies.

VCP can be converted to a current signal drawn

from FB. The voltage drop on RUP helps the

output cable compensation. When the system

operates in the maximum load, the CP voltage

reaches a maximum of 2V.

+ -

VCP

RUP

RDOWN

VFCP

Figure 5: Output Cable Compensator

Determine

the

compensation

voltage

with

Equation (7):

P _ AU

FCP

5.6 D

2 R

360 10





 



(7)

Where

VFCP

the

secondary-side

compensation

voltage

drop,

the

secondary-diode duty cycle in CC mode (0.4 for

the MP020A-5), RUP is the upper resistor of the

resistor divider, NS is the number of turns for the

secondary-side transformer windings, and NP_AU

is the number of transformer auxiliary winding

turns.

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