CM6901GISTR datasheet(11/15 Pages) CHAMP

Part #	CM6901GISTR

Description	SLS (SRC/LLCSR) Controller with 1 FM2 PWMs

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Manufacturer	CHAMP [Champion Microelectronic Corp.]

Direct Link	http://www.champion-micro.com

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11 / 15 page

CM6901

SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs

2009/11/02 Rev1.4

Champion Microelectronic Corporation

Page 11

Light Load PWMING

In Application , low gain configuration accomplished by connecting Rf4 and Rf5 in the closed loop configuration . The

gain for the PWM is determined by Rf4 and Rf5 where the gain is equal to -Rf5/Rf4. The voltage of VRset at which

the controller goes into FM and PWM simultaneously is equal to :

VRset = D_IN+ × (1+Rf4/Rf5) - (Rf4/Rf5) × 3 where 3 is the peak voltage of RTCT

Varyin Rset from VRset to VRset + 1.75 × Rf4/Rf5 will cause the duty cycle to vary from 50% to 0% while the

frequency will vary propotionally according to 1.75*Rf4/Rf5 where 1.75 is the peak-to-peak voltage of the RTCT

ramp. For proper operation, select Rf5 value so that the current through Rf5 {((D_IN+) - 1.2)/Rf5} should be less

than 5uA.

V T o I

2. 5V

VF B

OS C

Vr e f

RT

CT

+

-

Rf 1

Rf 3

Vo u t

+

-

Vr e f

RS E T

+

-

D_ I N +

DE A O

RT CT

PW M

D_ I N -

F EAO

Rf 4

Rf 5

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CM6901GISTR Datasheet(PDF) 11 Page - Champion Microelectronic Corp.

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