IL44608N75 datasheet(10/13 Pages) IKSEMICON

Part #	IL44608N75

Description	External Components Reliable and Flexible SMPS Controller

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Manufacturer	IKSEMICON [IK Semicon Co., Ltd]

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IL44608N

EQUATION 8

⎪

⎭

⎪⎪

⎪

⎬

⎫

⎪

⎩

⎪⎪

⎪

⎨

⎧

⎥

⎦

⎤

⎢

⎣

⎡

⎟⎟

⎟

⎠

⎞

⎜⎜

⎜

⎝

⎛

⎟

⎠

⎞

⎜

⎝

⎛

+

×

+

×

⎟

⎠

⎞

⎜

⎝

⎛

+

=

stup

pin3

S/L

S/Stup

stup

G

BM

I

k2

1

k

I

k1

1

d

where: k1 = Iccs/Istup

k2 = IccL/Istup

kS/Stup = (Vstup–UVLO2)/(Vstup–UVLO1)

kS/L = (UVLO1–UVLO2)/(Vstup–UVLO1)

PULSED MODE CURRENT SENSE CLAMPING LEVEL

Equations 9, 10, 11 and 12 allow the calculation of the Rcs value for the desired maximum current peak value during the

SMPS stand–by mode.]

EQUATION 9

S

cs

th

cs

stby

R

)

I

(R

V

Ipk

×

−

=

−

where: Vcs–th is the CS comparator threshold

Ics is the CS internal current source

RS is the sensing resistor

Rcs is the resistor connected between pin 2 and RS

EQUATION 10

S

th

c

cs

th

cs

stby

R

V

I

R

1

V

Ipk

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

×

−

×

=

−

s

EQUATION 11

(

)

S

stby

cs

th

cs

stby

R

Y

R

1

V

Ipk

−

×

−

×

=

where: Ycs–stby = Ics/Vcs–th

Taking into account the circuit propagation delay (δtcs) and the Power Switch reaction time (δtps):

EQUATION 12

(

)

P

ps

cs

in

S

stby

cs

th

cs

stby

L

)

δt

t

(δ

V

R

Y

R

1

V

Ipk

+

×

+

⎥

⎦

⎤

⎢

⎣

⎡

×

−

×

=

−

10

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