EVAL6599-400W-S STMicroelectronics, EVAL6599-400W-S Datasheet - Page 12

• Manufacturer Part Number: EVAL6599-400W-S
• Description: DEMO BOARD FOR L6599
• Manufacturer: STMicroelectronics
• Type: Power Factor Correctionr

Specifications of EVAL6599-400W-S

• Main Purpose: AC/DC, Primary Side and PFC
• Outputs And Type: 3, Isolated
• Power - Output: 400W
• Voltage - Output: 200V, 5V, 3.3V
• Current - Output: 2A, 1A, 700mA
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: Resonant
• Board Type: Fully Populated
• Utilized Ic / Part: L6563, L6599
• Input Voltage: 90 V to 264 V
• Output Voltage: 3.3 V to 200 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: 497-5856

Electrical test results
2.3
12/35
Figure 11. Overall efficiency versus input mains voltage at various output power
Resonant stage operating waveforms
Figure 12.
full load. The Ch1 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 Ch2 waveform represents the transformer primary current
flowing into the resonant tank. As shown, it has almost a sinusoidal shape. The resonant
tank has been designed (following the procedure presented in the application note AN2450)
to operate at a resonance frequency of about 120 kHz when the dc input voltage of the half-
bridge circuit is at 390 V (that is the nominal output voltage of the PFC stage).
The resonant frequency has been selected at approximately 120 kHz in order to have a
good trade off between transformer losses and dimensions.
The resonant tank circuit has been designed in order to have a good margin for ZVS
operation, providing good efficiency, while the almost sinusoidal current waveform allows for
an extremely low EMI generation.
Figure 13.
is at a light load (about 30 W) or not loaded at all. These two graphics demonstrate the
ability of the converter to operate down to zero load, with the output voltage still within the
regulation range. The resonant tank current has a triangular shape and represents the
magnetizing current flowing into the transformer primary side. The oscillation superimposed
on the tank current depends on the occurrence of a further resonance due to the parallel of
the inductances at primary side (the series and shunt inductances in the APR (all primary
referred) transformer model presented in AN2450) and the undesired secondary side
capacitance reflected at the transformer primary side.
and
shows some waveforms during steady state operation of the resonant circuit at
levels
Figure 14.
94%
93%
92%
91%
90%
89%
88%
87%
86%
85%
Eff[%]
80
shows the same waveforms as
120
400W
160
200W
Vin [Vrms]
200
70W
Figure
240
12, when the +200 V output
280
AN2492