EVL6564-100W STMicroelectronics, EVL6564-100W Datasheet - Page 16

• Manufacturer Part Number: EVL6564-100W
• Description: BOARD EVAL PFC FOR L6564D
• Manufacturer: STMicroelectronics
• Type: Power Factor Correctionr

Specifications of EVL6564-100W

• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 1, Non-Isolated
• Power - Output: 100W
• Voltage - Output: 400V
• Voltage - Input: 90 ~ 265VAC
• Regulator Topology: Boost
• Frequency - Switching: 40kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6564
• Input Voltage: 90 V to 265 V
• Output Voltage: 400 V
• Dimensions: 90 mm x 83 mm
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Current - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: L6564
• Other names: 497-10164

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 causes distortion of the current reference (resulting
in high THD and poor PF). If it is too large, there is 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 L6564 implements an innovative voltage feed-forward which, with a technique that
makes use of just two external parts, overcomes this time constant trade-off issue whichever
voltage change occurs on the mains (either a surge or drop). A capacitor C
R
circuit that provides a DC voltage equal to the peak of the rectified sine wave applied on pin
MULT (pin #3). In this way, in case of a sudden line voltage rise, C
through the low impedance of the internal diode. In case of a line voltage drop, an internal
“mains drop” detector enables a low impedance switch which suddenly discharges C
avoiding a long settling time before 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 pre-regulator’s output like in systems with no
feed-forward compensation.
Figure 19
input voltage surge from 90 to 140Vac. In the diagram 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
the same output power. The controller cannot compensate a mains surge and the output
voltage stability is guarantee 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
140 Vac – no V
FF
, both connected from the pin V
shows the behavior of the EVL6564-100W demonstration board in case of an
Figure 18
FF
input
which shows the behavior of a PFC using the L6562A and delivering
FF
Doc ID 16106 Rev 1
function, the compensation of the input voltage variation is
FF
(pin #5) to ground, complete an internal peak-holding
Figure 19. EVL6564 100W TM PFC: input
CH1: Vout
CH3: V
FF
(pin #5)
mains surge 90 Vac to 140 Vac
C
FF
= 1 µF, R
FF
CH2: MULT (pin #3)
CH4: I_AC
FF
is rapidly charged
= 1 MΩ
FF
FF
and a resistor
function
AN3022
FF