MP024-10 datasheet(18/25 Pages) MPS

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MP024-10

– PRIMARY-SIDE CC/CV REGULATOR

MP024-10 Rev.1.0

www.MonolithicPower.com

4/17/2017

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

CCP

VLimit*tons

Figure 9: Output Cable Compensation

Determine

the

compensation

voltage

with

Equation (10):

P _ AU

Limit

FCP

8 V

2 R

300 10





 



(10)

Where

VFCP

the

secondary-side

compensation

voltage

drop,

the

secondary-diode duty cycle, RUP is the upper

resistor of the resistor divider, NS is the number

of turns for the secondary-side transformer

windings, NP_AU is the number of transformer

auxiliary winding turns, and VLimit is the current

limit.

For example, to calculate the maximum output

cable compensation in CC condition, use DS =

DS-Max (when CP function is used, DS-Max is 0.4)

and VLimit = VLimit-Max (typically 480mV) in the

formula. The compensation voltage drops as

VLimit or DS decrease along with the load current.

The CP voltage is 8*VLimit*DS.

Connect a 1µF capacitor to CP for cable

compensation. Since CP is also used for DS-Max

customization, the cable compensation function

is only available when CP is connected to the

capacitors directly. If there is any non-zero

resistor connected to CP, all of the internal

blocks related to the cable compensation

function are disabled and there is no current

sinking into FB.

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