RT8113 datasheet(16/21 Pages) RICHTEK

부품명	RT8113

상세설명	Single Phase VR11.1 PWM Controller with 7-bit VID

PDF	21 Pages

Scroll/Zoom	100%

제조업체	RICHTEK [Richtek Technology Corporation]

홈페이지	http://www.richtek.com

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16 / 21 page

RT8113

DS8113-02 April 2011

www.richtek.com

Output Current Sensing

The RT8113 provides a low input offset current-sense

amplifier (CSA) to monitor the output current. The output

current of CSA (IX) is used for load line control and over-

current protection. In this inductor current sensing

topology, RS and CS must be set according to the equation

below :

Then the output current of CSA will follow the equation

below :

= R x C

DCR

(

)

OFS-CSA

CSP

CSN

I x DCR - V

+ 700n x R

+ R - R

I =

Figure 7. Circuit for Current Sensing

CSN

I x DCR

I =

RCSN

RCSP

DCR

ISN

ISP

CSA: Current Sense Amplifier

VIN

LGATE

PHASE

UGATE

BOOT

700nA

VOFS_CSA

700nA

700nA is a typical value of the CSA input offset current.

VOFS-CSA is the input offset voltage of CSA. VOFS-CSA of

the RT8113 is smaller than +/- 1.5mV. Usually, “VOFS-CSA

+ 700n x (RCSP + RS - RCSN)” is negligible except at very

light load and the equation can be simplified as the equation

below :

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