EVAL6599-200W STMicroelectronics, EVAL6599-200W Datasheet - Page 11

• Manufacturer Part Number: EVAL6599-200W
• Description: EVAL BOARD FOR L6599
• Manufacturer: STMicroelectronics
• Type: Power Factor Correctionr

Specifications of EVAL6599-200W

• Main Purpose: AC/DC, Primary Side and PFC
• Outputs And Type: 4, Isolated
• Power - Output: 200W
• Voltage - Output: 24V, 12V, 5V, 3.3V
• Current - Output: 6A, 5A, 1A, 700mA
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: Resonant
• Frequency - Switching: 95kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6563, L6599
• Input Voltage: 90 V to 264 V
• Output Voltage: 3.3 V to 24 V
• Dimensions: 132 mm x 265 mm
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: L6599
• Other names: 497-5496

AN2393
2.2
Figure 6.
Resonant stage operating waveforms
Figure 7
load. The Ch3 waveform is the half-bridge square voltage on Pin 14 of L6599, driving the
resonant circuit. In the picture it is not evident, but the switching frequency is normally
slightly modulated following the PFC pre-regulator 100-Hz ripple that is rejected by the
resonant control circuitry. The switching frequency has been selected approximately at
95-kHz in order to have a good trade off between transformer losses and dimensions.
The Ch4 waveform represents the transformer primary current flowing into the resonant
tank. As shown, it is almost sinusoidal because the operating frequency is close to the
resonance of the leakage inductance of the transformer and the resonant capacitor (C28).
In this condition, the circuit has a good margin for ZVS operation, providing good efficiency,
95.00%
94.00%
93.00%
92.00%
91.00%
90.00%
89.00%
88.00%
87.00%
86.00%
85.00%
84.00%
83.00%
82.00%
81.00%
80.00%
79.00%
78.00%
77.00%
76.00%
75.00%
95.00%
94.00%
93.00%
92.00%
91.00%
90.00%
89.00%
88.00%
87.00%
86.00%
85.00%
84.00%
83.00%
82.00%
81.00%
80.00%
79.00%
78.00%
77.00%
76.00%
75.00%
shows some waveforms during steady state operation of the resonant circuit at full
0
0
10
Overall efficiency versus output power at several input voltage values
10
20
20
30
30
40
40
50
50
60
60
70
70
80
80
90
Output power (W )
90
O utput power (W )
100 110 120 130 140 150 160 170 180 190 200 210
100 110 120 130 140 150 160 170 180 190 200 210
Electrical test results
eff% @ 170 Vac
eff% @ 200 Vac
eff% @ 230 Vac
eff% @ 264 Vac
eff% @ 90 Vac
eff% @ 100 Vac
eff% @ 115 Vac
eff% @ 135 Vac
11/35