7

Performance Data and Typical Characteristic Curves

80

100 120 140

200 220

260

V

0.88

0.98

1.00

160 180

240

0.92

0.94

EFFICIENCY/POWERFACTOR

vs

LINEVOLTAGE

Efficiency

PowerFactor

0.90

0.96

0

2

4

10

12

6

8

80

100 120 140

200 220

260

V

160 180

240

TOTAL HARMONICDISTORTION

vs

LINEVOLTAGE

7.1

Transient

Ch2:

BuckV

DS

Ch4:

LEDVoltage

0.5 A/div.

Ch3:

LEDCurrent

Ch1:

BuckV

IN

TRANSITIONMODEBUCKPWMRESPONSE

(Ch1andCh4shareGNDreference)

Ch2:

BuckV

DS

Ch4:

LEDVoltage

0.5 A/div.

Ch3:LED

Current

Ch1:

BuckV

IN

TRANSITIONMODEBUCKPWMRESPONSEEXPANDED

(Ch1andCh4shareGNDreference)

Performance Data and Typical Characteristic Curves

www.ti.com

Figure 4 through Figure 8 present some typical performance curves for the UCC28810EVM-002 with 30

Cree XRE LED’s at 900 mA.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications

10

SLUU355A – March 2009 – Revised June 2009

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