Texas Instruments HPA070 manual Test Results / Performance Data, Efficiency and Power Loss

SLUU186 − March 2004

6 Test Results / Performance Data

6.1Efficiency and Power Loss

Figure 3 shows the efficiency as the load is varied from 1 A to over 15 A. The typical efficiency remains over 90% as the load ranges from 3 A to 12 A.

				EFFICIENCY
					vs
	94				LOAD
	92
	90
%	88
−
Efficiency	86
	84
	82
	80
	78
	0	2	4	6	8	10	12	14	16
			IOUT − Output Current − A

Figure 3

			POWER DISSIPATION
					vs
					LOAD
	7
	6
− W	5
Dissipation
	4
− Power	3
	2
DISS
P	1
	0
	0	2	4	6	8	10	12	14	16
				IOUT − Output Current − A

Figure 4

6.2Closed Loop Performance

OVERALL GAIN AND PHASE

vs

FREQUENCY

50	Phase		160
40			140
30			120
		Gain	100	°
20				−
				Phase
10			80
GaindB−			60
0
−10			40
−20			20
−30	1 k	10 k	0
100			100 k
	f − Frequency − kHz

Figure 5.

TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HPA070) 11