STEVAL-ISF001V1 STMicroelectronics, STEVAL-ISF001V1 Datasheet - Page 10

• Manufacturer Part Number: STEVAL-ISF001V1
• Description: BOARD EVAL FOR L6563/STW55NM60N
• Manufacturer: STMicroelectronics
• Type: MOSFET & Power Driverr

Specifications of STEVAL-ISF001V1

• Main Purpose: Power Management, Power Factor Correction
• Embedded: No
• Utilized Ic / Part: L6563
• Primary Attributes: 3 kW, 400 V Out, FOT(Fixed Off Time Control), 240 VAC (185 ~ 265 Vrms)
• Secondary Attributes: Iout Max 7.5 A
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: STW55NM60N
• Other names: 497-8850

PFC board connection
10/20
The chosen switching devices are two Power MOSFETs, MDmesh™ II family,
STW55NM60N. These two Power MOSFETs placed in parallel assure a low R
the conduction power losses.
Good efficiency and good thermal behavior of the system can be reached.
In order to properly drive the two Power MOSFETs and to minimize switching losses, during
the on and off transient, a small push-pull driver was interposed between the driver and the
two gates. A reading of the current conducted by the two Power MOSFETs, equal to the
current on the main inductor during the T
right current level on the inductor according to the input instantaneous voltage and the
output power delivered to the load. This current is sensed by a sensing resistor paralleling
two 0,07 Ω non-inductive sensing resistors. The output DC bus voltage is sensed by the
driver through the resistive net composed of R12, R16, R17, and R24.
As described in the L6563 datasheet, a PFC pre-regulator output voltage
monitoring/disable function exists. This pin senses the output voltage of the PFC pre-
regulator through a resistor divider and is used for protection purposes. If the voltage at the
pin exceeds 2.5 V, the IC is shut down, its consumption goes almost to the startup level and
this condition is latched. The PWM_LATCH pin is asserted high. Normal operation can be
resumed only by cycling Vcc. This function is used for protection in case the feedback loop
fails.
The RC net, on pin ZCD, is used to fix the desired T
calculation of the application (for complete design rules, please refer to "Design of fixed-off-
time-controlled PFC pre-regulators with the L6562").
The small signal bit Q3 is used to implement a T
voltage. At the moment of low voltage on the input waveform (near the zero-crossing of the
input sinusoidal supply) and in order to minimize the distortion on the input current due to
the low input voltage, the T
between T
ON
and T
OFF
is increased and the distortion on the input current can be reduced.
OFF
Doc ID 15337 Rev 1
period needs to be reduced. Acting in this way, the ratio
ON
period, is necessary for the driver to set the
OFF
OFF
modulation according to the input
time according to the sizing
DS(on)
, limiting
UM0673