EVL6563S-100W STMicroelectronics, EVL6563S-100W Datasheet - Page 16

• Manufacturer Part Number: EVL6563S-100W
• Description: EVAL BOARD FOR L6563(100W)
• Manufacturer: STMicroelectronics
• Type: Power Factor Correctionr

Specifications of EVL6563S-100W

• Main Purpose: Power Management, Power Factor Correction
• Embedded: No
• Utilized Ic / Part: L6563
• Primary Attributes: 100W Power Factor Correction and Preregulator Combination
• Secondary Attributes: Transition Mode & Active Tracking Boost Function.
• Board Size: 90 mm x 83 mm
• Maximum Operating Temperature: + 60 C
• Operating Supply Voltage: 90 V to 265 V
• Product: Power Management Modules
• Dimensions: 90 mm x 83 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: L6563S
• Other names: 497-10490

Test results and significant waveforms
16/33
Figure 18. L6562A input mains surge 90 Vac to
CH1: Vout
CH2: MULT (pin #3)
CH4: I_AC
ripple at twice the mains frequency that will cause distortion of the current reference
(resulting in high THD and poor PF). If it is too large, there will be a considerable delay in
setting the right amount of feed-forward, resulting in excessive overshoot and undershoot of
the pre-regulator's output voltage in response to large line voltage changes. Clearly a trade-
off was required.
The L6563S implements an innovative voltage feed-forward which, with a technique that
overcomes this time constant trade-off issue whichever voltage change occurs (both surges
and drops) on the mains. A capacitor C
connected to the V
voltage equal to the peak of the rectified sine wave applied on pin MULT (pin #3). In this way,
in case of sudden line voltage rise, C
internal diode. In case of line voltage drop, an internal "mains drop" detector enables a low
impedance switch which suddenly discharges C
reaching the new voltage level. Consequently, an acceptably low steady-state ripple and low
current distortion can be achieved without any considerable undershoot or overshoot on the
preregulator's output like in systems with no feed-forward compensation.
In
input voltage surge from 90 to 140 Vac. As shown, it is evident that the V
provides for the stability of the output voltage which is not affected by the input voltage
surge. In fact, thanks to the V
very fast and the output voltage remains stable at its nominal value. The opposite is
confirmed in
output power is shown. The controller cannot compensate a mains surge and the output
voltage stability is guaranteed by the feedback loop only. Unfortunately, as previously stated,
its bandwidth is narrow and thus the output voltage has a significant deviation from the
nominal value. The circuit has the same behavior in case of a mains surge at any input
voltage, and it is also not affected if the input mains surge happens at any point along the
input sine wave.
140 Vac, no V
Figure 19
we find the behavior of the EVL6563S-100W demonstration board in case of an
Figure 18
FF
input
FF
(pin #5), complete an internal peak-holding circuit that provides a DC
where the behavior of a PFC using the L6562A and delivering same
FF
Doc ID 16279 Rev 2
function, the compensation of the input voltage variation is
FF
FF
is rapidly charged through the low impedance of the
Figure 19. EVL6563S-100W TM PFC: input
CH1: Vout
CH2: MULT (pin #3)
CH3: V
CH4: I_AC
(C13) and a resistor R
FF
FF
(pin #5)
avoiding a long settling time before
mains surge 90 Vac to 140 Vac
FF
(R27 + R32), both
FF
function
AN3065