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EVL6566A-75WADP
19 V - 75 W laptop adapter with tracking boost PFC pre-regulator, using the L6563 and the L6566A
Data Brief
Features
■Universal input mains range: 90÷264Vac - Frequency 45 ÷ 65 Hz
■Output voltage: 19 V@4 A continuous operation
■Mains harmonics: Acc. to EN61000-3-2 Class-D
■ST-by mains consumption: Less than 0.25 W @265Vac
■Overall efficiency: Better than 86%
■EMI: According to EN55022-Class-B
■Safety: According to EN60950
■Low profile design: 25 mm maximum height
■PCB single layer: single side, 70 µm, CEM-1, 78x174 mm, Mixed PTH/SMT
Description
In this data brief of the EVL6566A-75WADP demo board, the main characteristics and features of a 75 W adapter wide-range input mains, power- factor-corrected AC-DC adapter using the new L6566A controller and the L6563 dedicated to the PFC stage are described.
High efficiency and the very low standby input consumption are highlighted in the following figures and tables. The board is programmed for working at fixed frequency (65 kHz) under nominal condition (19 V at 4 A).
On the secondary side the TSM1014 with a precise voltage reference and the optocoupler SFH617A-4 to transfer the error amplifiers information to the primary side have been used.
September 2007 |
Rev 1 |
1/8 |
For further information contact your local STMicroelectronics sales office. |
www.st.com |
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Efficiency |
EVL6566A-75WADP |
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1 Efficiency
Table 1 below shows the efficiency with two different input voltages. The table begins with the nominal load at 80 W on the output and it displays the efficiency at every power decrease of 5 W.
Table 1. |
Efficiency measurements |
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230 V-50 Hz |
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115 V-60 Hz |
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Pin |
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Pout |
Eff. |
Pin |
Pout |
Eff. |
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85.73 |
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75.05 |
87.5% |
87.24 |
75.06 |
86.0% |
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80.56 |
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70.00 |
86.9% |
80.73 |
70.00 |
86.7% |
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74.91 |
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65.01 |
86.8% |
74.34 |
65.01 |
87.4% |
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68.68 |
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59.97 |
87.3% |
68.95 |
60.00 |
87.0% |
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62.40 |
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55.01 |
88.2% |
63.80 |
55.02 |
86.2% |
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56.96 |
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50.00 |
87.8% |
58.03 |
50.04 |
86.2% |
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52.31 |
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45.02 |
86.1% |
51.80 |
45.05 |
87.0% |
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47.03 |
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40.00 |
85.1% |
45.45 |
40.00 |
88.0% |
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41.01 |
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35.05 |
85.5% |
40.53 |
35.05 |
86.5% |
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34.40 |
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30.00 |
87.2% |
35.15 |
30.00 |
85.3% |
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29.60 |
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25.02 |
84.5% |
29.00 |
25.02 |
86.3% |
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24.70 |
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20.00 |
81.0% |
23.07 |
20.00 |
86.7% |
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17.86 |
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14.94 |
83.7% |
18.36 |
15.05 |
82.0% |
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11.98 |
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10.00 |
83.5% |
11.88 |
10.00 |
84.2% |
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6.64 |
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5.01 |
75.5% |
6.10 |
5.05 |
82.8% |
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2.73 |
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1.99 |
72.9% |
2.53 |
1.99 |
78.7% |
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Above the 20 W power output, the efficiency is constant over 85%.
Figure 1. Overall efficiency versus output power at nominal mains voltages
2/8
EVL6566A-75WADP |
Full load |
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2 Full load
Figure 2 and Figure 3 below show the drain and gate fly-back waveforms and the relevant switching frequency at full load.
Figure 2. L6566A fly-back stage |
Figure 3. L6566A fly-back stage |
waveforms at 115 V-60 Hz full load |
waveforms at 230 V-50 Hz full load |
CH1: drain 6566A |
CH1: drain 6566A |
CH2: gate 6566A |
CH2: gate 6566A |
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3/8
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