UCC28600DG4 datasheet(9/31 Pages) TI1

Part #	UCC28600DG4

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

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C

VDD +

I

DD ) CISSVOUT(hi)fQR(max)

T

BURST

DVDD(burst)

C

VDD +

I

DD ) CISSVOUT(hi)fQR(max)

t

SS

DVDD(uvlo)

R

VDD +

p

4

N

B

NP

V

DS1(os) fQR(max)

L

LEAKAGE CD ) CSNUB

I

DD ) CISS VOUT(hi) fQR(max)

R

SU +

V

BULK(min)

I

STARTUP

UCC28600

www.ti.com

SLUS646J

– NOVEMBER 2005 – REVISED JULY 2011

TERMINAL COMPONENTS (continued)

TERMINAL

I/O

DESCRIPTION(1) (2) (3)

NAME

NO.

CVDD is the greater of:

or

(3)

VDD

6

I

where:

•

IDD is the operating current of the UCC28600

(6)

•

CISS is the input capacitance of MOSFET M1

•

VOUT(hi) is VOH of the OUT pin, either 13 V (typ) VOUT clamp or less as measured

•

fQR(max) is fS at high line, maximum load

(6)

•

TBURST is the measured burst mode period

•

ΔVDD(burst) is the allowed VDD ripple during burst mode

•

ΔVDD(uvlo) is the UVLO hysteresis

(6)

•

VDS1(os) is the amount of drain-source overshoot voltage

•

LLEAKAGE is the leakage inductance of the primary winding

•

CD is the total drain node capacitance of MOSFET M1

•

ISTARTUP is IDD start-up current of the UCC28600

(6)

•

CSNUB is the snubber capacitor value

•

tSS is the soft start charge time

(7)

(6)

Refer to the Electrical Characteristics Table for constant parameters.

(7)

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

in the operational circuit.

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