2STR1215 datasheet(21/56 Pages) STMICROELECTRONICS

部件名	2STR1215

功能描述	38 V, 10 W synchronous iso-buck converter for isolated applications

PDF	56 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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21 / 56 page

Figure 24. Primary output efficiency vs. switching frequency (VIN = 12 V, VOUT_prim = 5 V, secondary

isolated output (not loaded)

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0,5

1,5

2,5

Primary output current [A]

fsw = 200 kHz

fsw = 400 kHz

fsw = 700 kHz

Secondary isolated output

Figure 25 shows the efficiency referred to the secondary isolated output at different input voltages, whose effect

on the efficiency is more evident at lower currents.

Figure 25. Secondary isolated output efficiency at different input voltages (VOUT_prim = 5 V, fSW = 400 kHz,

N = 6)

20%

40%

60%

80%

100%

0.1

0.2

0.3

0.4

0.5

0.6

0.7

Isolated output current [A]

Vin = 12 V

Vin = 18 V

Vin = 24 V

Figure 26 depicts the efficiency variation with the switching frequency. A lower switching frequency contributes

to a better efficiency by improving the load regulation (higher isolated output voltage, that is, higher power), in

addition to the obvious lower switching losses.

L6983I

Efficiency

DS14040 - Rev 1

page 21/56

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