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AN2450 Datasheet(PDF) 29 Page - STMicroelectronics

Part # AN2450
Description  LLC resonant half-bridge converter design guideline
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2450 Datasheet(HTML) 29 Page - STMicroelectronics

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DocID12784 Rev 6
29/35
AN2450
Electrical test results
35
8
Electrical test results
8.1
Efficiency measurements
Table 2, Table 3 and Table 4 show the output voltage and current measurements at the
various dc input voltage (nominal 390 Vdc, min 360 Vdc and max 420 Vdc) and several load
conditions. For all measurements, both at full load and at light load operation, the input
power has been measured by a digital power meter (Yokogawa WT-210). Particular
attention has to be paid when measuring input power at full load in order to avoid
measurement errors due to the voltage drop on cables and connections (connecting the
WT-210 voltmeter termination to the board input connector). For the same reason, the
measurements of the output voltages have been taken directly at the output connector, by
using the remote sense option of the active load (Chroma 63108 and 63103) connected to
the outputs.
Table 2. Efficiency measurements at Vin = 390 Vdc
+200 V
At load (A)
+75 (V)
At load (A)
Pout (W)
Pin (W)
Efficiency %
198.76
1.603
76.74
1.010
396.12
408.80
96.90%
198.75
1.300
76.80
0.811
320.66
330.81
96.93%
198.76
1.001
76.87
0.613
246.08
253.90
96.92%
198.79
0.751
76.95
0.414
181.15
187.54
96.59%
198.84
0.500
77.03
0.200
114.83
120.24
95.50%
198.87
0.151
77.06
0.107
38.27
42.70
89.64%
Table 3. Efficiency measurements at Vin = 360 Vdc
+200 V
At load (A)
+75 (V)
At load (A)
Pout (W)
Pin (W)
Efficiency %
198.68
1.603
76.68
1.010
395.93
409.47
96.69%
198.64
1.301
76.74
0.811
320.67
331.26
96.80%
198.62
1.000
76.81
0.613
245.70
254.17
96.67%
198.60
0.751
76.88
0.414
180.98
187.23
96.66%
198.57
0.500
76.94
0.198
114.52
120.43
95.09%
198.57
0.151
76.94
0.107
38.22
43.20
88.46%



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