EVAL6599-400W-S STMicroelectronics, EVAL6599-400W-S Datasheet - Page 4

• 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

Main characteristics and circuit description
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Main characteristics and circuit description
The main characteristics of the SMPS are listed below:
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The circuit consists of three stages. A front-end PFC pre-regulator implemented by the
controller L6563
controller L6599
(Figure
The PFC stage delivers a stable 400 VDC supply to the downstream converters (resonant +
flyback) and provides for the reduction of the current harmonics drawn from the mains, in
order to meet the requirements of the European norm EN61000-3-2 and the JEIDA-MITI
norm for Japan.
The PFC controller is the L6563 (U1), integrating all functions needed to operate the PFC
and interface the downstream resonant converter. Though this controller chip is designed for
Transition-Mode (TM) operation, where the boost inductor works next to the boundary
between Continuous (CCM) and Discontinuous Conduction Mode (DCM), by adding a
simple external circuit, it can be operated in LM-FOT (line-modulated fixed off-time) mode,
allowing Continuous Conduction Mode operation, normally achievable with more expensive
control chips and more complex architectures. This operative mode allows the use of this
device at a high power level, usually covered by CCM topologies. For a detailed and
complete description of the LM-FOT operating mode, see the application note AN1792. The
external components to configure the circuit in LM-FOT mode are: C15, C17, D5, Q3, R14,
R17 and R29.
The power stage of the PFC is a conventional boost converter, connected to the output of
the rectifier bridge through a differential mode filtering cell (C5, C6 and L3) for EMI
reduction. It includes a coil (L4), a diode (D3), and two capacitors (C7 and C8). The boost
switch consists of two Power MOSFETs (Q1 and Q2), connected in parallel, which are
directly driven by the L6563 output drive thanks to the high current capability of the IC. The
divider (R30, R31 and R32) connected to MULT pin 3 brings the information of the
instantaneous voltage that is used to modulate the boost current and to derive further
information like the average value of the AC line used by the VFF (voltage feed-forward)
function. This function is used to keep the output voltage almost independent of the mains.
The divider (R3, R6, R8, R10 and R11) is dedicated to detecting the output voltage while a
further divider (R5, R7, R9, R16 and R25) is used to protect the circuit in case of voltage
loop failure.
The second stage is an LLC resonant converter, with half-bridge topology implementation,
working in ZVS (zero voltage switching) mode. The controller is the L6599 integrated circuit
that incorporates the necessary functions to properly drive the two half-bridge MOSFETs by
a 50% fixed duty cycle with fixed dead-time, changing the frequency according to the
Universal input mains range: 90 to 264 V
Output voltages: 200 V @ 2 A - 3.3 V @ 0.7 A - 5 V @ 1 A
Mains harmonics: Compliance with EN61000-3-2 specifications
Stand-by mains consumption: Typical 0.5 W @230 V
Overall efficiency: better than 88% at full load, 90-264 V
EMI: Compliance with EN55022-class B specifications
Safety: Compliance with EN60950 specifications
PCB single layer: 132x265 mm, mixed PTH/SMT technologies
3) utilizing the VIPer12A off-line primary switcher.
(Figure
(Figure
1), a half-bridge resonant DC/DC converter based on the resonant
2) and a 7 W flyback converter intended for stand-by management
AC
- 45 to 65 Hz
AC
AC
AN2492