AN2359 datasheet(14/18 Pages) STMICROELECTRONICS

14 / 18 page

Application example nº 2

AN2359

14/18

4.1

Experimental results

In Table 9., Table 10. and Table 11. the measures performed on the proposed converter are

listed. In Figure 16. and Figure 17. typical waveforms at 300VDC are shown.

The converter performs well in terms of line and load regulation. The –5V output shows a

±5% of precision. VOUT1, obtained by means of the turns ratio of the inductor, shows good

performance too, even if an overvoltage occurs on VOUT1 when it is in no load condition and

VOUT2 is full loaded. This can be avoided connecting an appropriate bleeder resistor on

VOUT1. The efficiency measurements show a better behavior compared to the –12V

solution. This can be explained because, in this configuration, the turn-on losses are lower

compared to the –12V solution.

(Read sec. 6)

Pulse PFM0250

STMicroelectronics

Table 8.

Component list (continued)

Reference

Value

Description

Table 9.

Experimental results - VIN=120VDC

IOUT1[mA] IOUT2[mA]

VOUT1[V]

VOUT2[V]

IIN[mA]

PIN[W]

POUT[W]

η[%]

24.09

5.096

0.986

0.1972

0.00

23.87

5.098

3.643

0.7286

0.39164

53.75

150

23.97

5.087

13.33

2.666

1.96155

73.58

240

24.05

5.075

20.5

4.1

3.142

76.63

100

300

24.06

5.069

25.68

5.136

3.9267

76.45

300

41.54

5.02

12.74

2.55

1.51

59.11

100

21.82

5.083

13.74

2.75

2.18

79.40

Table 10.

Experimental results - VIN=320VDC

IOUT1[mA] IOUT2[mA]

VOUT1[V]

VOUT2[V]

IIN[mA]

PIN[W]

POUT[W]

η[%]

24.1

5.098

0.666

0.20

0.00

23.9

5.094

2.435

0.73

0.39

53.64

150

23.96

5.091

9.182

2.75

1.96

71.21

240

24.03

5.079

13.85

4.16

3.14

75.60

100

300

24.03

5.068

17.17

5.15

3.92

76.17

300

41.14

5.025

8.684

2.61

1.51

57.87

100

21.89

5.096

9.41

2.82

2.19

77.54

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