NXP Semiconductors
UM10972
TEA1916DB1262 digital resonant 240 W/12 V power supply demo board
UM10972
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User manual
Rev. 1.1 — 8 June 2018
COMPANY PUBLIC
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5.3.2 No-load power consumption
Power consumption performance of the total application board at no load was measured
with a Yokogawa WT210 digital power meter. To measure the power consumption over a
long time, the integration time function was used.
Table 5. Output voltage and power consumption at no load
Condition
ENERGY STAR 2.0
requirement
Output voltage
Power consumption
115 V/60 Hz
≤ 500 mW
12.2 V
46 mW
230 V/50 Hz
≤ 500 mW
12.2 V
51 mW
5.3.3 Standby load power consumption
Power consumption performance of the total application board at standby load was
measured with a Yokogawa WT210 digital power meter. To measure the power
consumption over a long time, the integration time function was used.
Table 6. Output voltage and power consumption at no load
Condition
ENERGY STAR 2.0
requirement
Output voltage
Power consumption
115 V/60 Hz
250 mW
12.2 V
356 mW
230 V/50 Hz
250 mW
12.2 V
357 mW
Requirement
< 500 mW
5.3.4 Power factor correction
Table 7. Output voltage and power consumption at no load
Condition
ENERGY STAR 2.0
requirement
Output power
Power factor
115 V/60 Hz
≥ 0.9 mW
240 W
0.992
115 V/60 Hz
-
120 W
0.976
230 V/50 Hz
-
240 W
0.945
230 V/50 Hz
-
120 W
0.911
5.4 Low-power mode and burst mode operation
To reach a high efficiency at medium/low and standby output power, the low-power mode
and burst mode are introduced.
In low-power mode, the behavior of the half-bridge converter is changed compared to
the standard behavior at maximum output power. The result is a higher efficiency that is
close to the expected efficiency at maximum load.
The power level for leaving the high-power mode and entering the low-power mode can
be adjusted. Here the power level is set at 53.4 W.
Below 21.3 W, the HBC converter enters burst mode, which improves the overall
efficiency at lower output loads.
