UM10444 Datasheet, PDF (7/33 Pages) NXP Semiconductors – 90 W notebook adapter with TEA1753, TEA1703 and TEA1791

NXP Semiconductors
UM10444
90 W notebook adapter with TEA1753, TEA1703 and TEA1791
3.2.1.3 Full load efficiency PFC plus flyback stage
Test conditions:
Before any measurements were recorded, the adapter is set to maximum load and is
preheated till the readings were stabilized.
Remark: The output voltage is measured at the end of the output cable. (2 × 20 mΩ)
Criteria to pass:
The efficiency (η) must be > 88 % at the maximum continuous output load.
Table 5. PFC plus flyback stage
Total converter efficiency (at full load) as a function of the mains input
Mains supply
I_I RMS (A) P_O (W)
P_I (W)
Efficiency
(%)
90 V/60 Hz
1.130
88.74
100.24
88.53
100 V/50 Hz
1.013
88.76
99.58
89.14
115 V/60 Hz
0.877
88.72
98.94
89.67
230 V/50 Hz
0.456
88.73
98.41
90.17
264 V/50Hz
0.402
88.66
98.26
90.24
Power factor
0.989
0.987
0.986
0.945
0.929
3.3 Timing and protection
3.3.1 Switch-on delay and output rise time
Test conditions:
The electronic load is set to Constant Current (CC) mode and V_on = 0 V. The electronic
load is set to the maximum continuous output current.
Criteria to pass:
• Switch-on delay: two seconds maximum after the AC mains voltage is applied to the
time when the output is within regulation
• Output rise time: The output voltage must rise from 10 % of the maximum to the
regulation limit within 30 ms. There must be a smooth and continuous ramp-up of the
output voltage. No voltage with a negative polarity must be present at the output
during start-up
• No output bounce or hiccup is allowed during switch-on.
• There be must be sufficient margin between the FBCTRL signal and the 4.5 V
time-out trigger level to avoid false triggering of the time-out protection due to
component tolerances
UM10444
User manual
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 4 April 2011
© NXP B.V. 2011. All rights reserved.
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