EVL6563H-100W View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'EVL6563H-100W' PDF : 31 Pages View PDF
Layout hints
5
Layout hints
AN3118
The layout of any converter is a very important phase in the design process needing
attention by the design engineers as any other design phase. Even if the layout phase looks
sometimes time consuming, a good layout surely saves time during the functional
debugging and the qualification phases. Additionally, a power supply circuit with a correct
layout needs smaller EMI filters or less filter stages and so it allows a consistent cost saving.
Converters using the L6563H do not need any special or specific layout rule to be followed;
just the general layout rules for any power converter which must be applied carefully. the
basic rules are listed below; they can be used for other PFC circuits having any power level,
working either in transition mode or with a fixed off-time control.
1. Keep power and signal RTN separated. Connect the return pins of components
carrying high current, such as input filter capacitors, sensing resistors, output
capacitors as close as possible. This point is the RTN star point. A downstream
converter will have to be connected to this return point.
2. Minimize the length of the traces relevant to the boost inductor, MOSFET drain, boost
rectifier and output capacitor.
3. Keep signal components as close as possible to each L6563H relevant pin. to specify,
keep the tracks relevant to the pin #1 (INV) net as short as possible. Components and
traces relevant to the Error Amplifier must be placed far from traces and connections
carrying signals with high dV/dt, like the MOSFET drain. For high power converters or
very compact PCB layout a 10 nF capacitor connected to pin #8 (PWM_LATCH) and
pin #14 (GND) might be required to decrease the noise picked-up by this pin while it is
in its high impedance status.
4. Please connect heat sinks to power GND
5. Add an external copper shield around the boost inductor and connect it to power GND.
This shield helps a lot against conducted and radiated noise also
6. Please connect the RTN of the signal components including the feedback, PFC_OK
and MULT dividers close to the L6563H pin #14 (GND)
7. Connect a ceramic capacitor (100÷470 nF) to pin #16 (Vcc) and pin #14 (GND), close
to the L6563H. Connect this point to the RTN star point (see 1).
Figure 37. EVL6563H-250W TM PFC: PCB layout (SMT side view)
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Doc ID 16847 Rev 2
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