Texas Instruments TPS40090EVM-002 Test Results and Performance Data, Efficiency and Power Loss

SLUU195 − June 2004

6 Test Results and Performance Data

6.1Efficiency and Power Loss

Figure 8 shows the efficiency as the load varies from 10 A to over 100 A. The efficiency at full load is about 84.3%.

Figure 7 shows the total loss versus the load current, which is approximately 28.3W at 100 A.

			OVERALL EFFICIENCY
				vs
	90		OUTPUT CURRENT					40
		VIN = 12 V
		fSW = 420 kHz						35
	85
							W	30
Efficiency − %	80						− Power Loss −	25
								20
Percent	75						LOSS	15
							P
								10
	70
								5
	65							0
	0	20	40	60	80	100	120
			IOUT − Output Current − A

TOTAL POWER LOSS

vs

OUTPUT CURRENT

	VIN = 12 V
	fSW = 420 kHz
0	20	40	60	80	100	120
		IOUT − Output Current − A

Figure 8. Figure 9.

TPS40090 Multi-Phase Buck Converter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A 15