RT3602AE datasheet(32/46 Pages) RICHTEK

32 / 46 page

RT3602AE

www.richtek.com

DS3602AE-00 August 2017

is a registered trademark of Richtek Technology Corporation.

Figure 14. Thermal Compensation method for dual

Phase

The current sense network equation is as follows :

{

IMON

ref

IMON1

IMON2

IMON3

NTC

IDCR

//(R

)]}













Please note that VIMON is equal to 1V for single phase

application and VIMON is equal to 1.4V for dual phase

application under ICCMAX condition.

A resistor network with NTC thermistor compensation

connecting between IMON pin and VREF pin is used to

compensate the positive temperature coefficient of inductor

DC. The design flow is as follows :

Step1: Given the three temperature TL, TR and TH, at which

are compensated.

Step 2 : Three equations can be listed as

IMON L

DCR(T )

(T ) 0.4









IMON R

DCR(T )

(T ) 0.4









IMON H

DCR(T )

(T ) 0.4









Where :

(1) The relationship between DCR and temperature is as

follows :

DCR(T) DCR(25 C) [1 0.00393(T-25)]

  

(2) RIMON(T) is the equivalent resistor of the resistor network

with a NTC thermistor

IMON

IMON1

IMON2

IMON3

NTC

R(T) R

//[R

(T)]}





And the relationship between NTC and temperature is as

follows :

β()

T 273 298

NTC

R(T) R(25 C) e





 

β is in the NTC thermistor datasheet.

Step 3 : Three equation and three unknowns, RIMON1, RIMON2

and RIMON3 can be calculated out unique solution.

IMON2

NTCTR

IMON3

IMON1

IMON2

NTCTR

IMON3

R(R

)







IMON2

NTCTL

NTCTR

NTCTL NTCTR

R[K

) R

]α





IMON3

IMON2





Where :

NTCTH

NTCTR







NTCTL

NTCTR







NTCTH

NTCTL

(α

/α )R

1(α

/α )







CCMAX

0.4

DCR(T )





CCMAX

0.4

DCR(T )





CCMAX

0.4

DCR(T )





ISEN1P

ISEN1N

DCR

VCORE

ILx1

IMON

RIMON1

VREF

ISEN2P

ISEN2N

LX2

DCR

VIMON

RIMON2

RIMON3

RNTC

RCS

RX1

RX2

RX1

RX2

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