UCC28600_13 datasheet(8/31 Pages) TI1

Part #	UCC28600

Description	8-Pin Quasi-Resonant Flyback Green-Mode Controller

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C

SS u ISS

t

SS(min)(due power limit)

A

CS(FB)

V

PL * VCS(os)

t

SS(min) +

* RLOAD(ss)COUT

2

n 1 *

V

OUT * DVOUT(step)

2

R

LOAD(ss)POUT(max)limit

t

SS(min) +

C

OUTVOUT

2

2 P

LIM

R

ST2 +

V

BE(off)

I

STATUS(leakage)

R

ST1 +

R

ST2

VDD

(uvlo*on) *

V

BE(sat) * RDS(on)

I

CC

bsat

* RDS(on)VBE(sat)

I

CC

bsat

R

ST2

) VBE(sat)

UCC28600

SLUS646J

– NOVEMBER 2005 – REVISED JULY 2011

www.ti.com

TERMINAL COMPONENTS (continued)

TERMINAL

I/O

DESCRIPTION(1) (2) (3)

NAME

NO.

where tSS(min) is the greater of:

or

SS

1

I

(2)

•

RLOAD(ss) is the effective load impedance during soft-start

(4)

•

ΔVOUT(step) is the allowed change in VOUT due to a load step

(4)

•

POUT(max limit) Programmed power limit level, in W

(4)

•

ACS(FB) is the current sense gain

(5)

•

VCS(os) is the CS offset voltage

(5)

•

ISS is the soft-start charging current

(5)

•

VPL is the power limit threshold

(5)

STATUS

8

O

where:

•

βSAT is the gain of transistor QST in saturation

•

VBE(sat) is the base-emitter voltage of transistor QST in saturation

•

VDD(uvlo-on) is the startup threshold

(5)

•

ICC is the collector current of QST

•

ISTATUS(leakage) is the maximum leakage/off current of the STATUS pin

(5)

•

VBE(off) is the maximum allowable voltage across the base emitter junction that will not turn QST on

•

RDS(on) is the RDS(on) of STATUS

(5)

(4)

Refer to the UCC28600 Design Calculator (TI Literature Number SLVC104) or laboratory measurements for currents, voltages and times

in the operational circuit.

(5)

Refer to the Electrical Characteristics Table for constant parameters.

8

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