EVL4984-350W
350 W CCM PFC pre-regulator demonstration board
based on the L4984D
Data brief
Description
The EVL4984-350W demonstration board, based
on the new L4984D continuous conduction mode
PFC controller, implements a 350 W wide-range
input PFC pre-conditioner. It is suitable for all
SMPS from 150 W to several kWs, and is
compliant with IEC61000-3-2 and JEITA-MITI
standards.
Features
• Line voltage range: 90 to 265 Vac
• Minimum line frequency (fL): 47 Hz
• Regulated output voltage: 400 V
• Rated output power: 350 W
• Maximum 2 fL output voltage ripple: 12.5 V
(peak-to-peak)
• Hold-up time: 20 ms (VDROP after hold-up
time: 300 V)
• Switching frequency: 70 kHz
• Minimum efficiency: 94% (at Vin = 90 Vac,
Pout = 350 W)
• PCB: single-side, 70 um, CEM-1, 112 x 114
mm
May 2013
DocID023720 Rev 2
For further information contact your local STMicroelectronics sales office.
1/10
www.st.com
10
General information and electrical schematics
1
EVL4984-350W
General information and electrical schematics
The main purpose of a PFC pre-conditioner is to correct input current distortion in order to
decrease the harmonic contents below the limits of the relevant regulations. Therefore, this
demonstration board has been tested in accordance with the European standard EN610003-2 Class-D and Japanese standard JEITA-MITI Class-D at full load and at both the nominal
input voltage mains.
The power stage of the PFC is a traditional boost PFC converter, connected to the output of
the rectifier bridge D2. It is made up of the boost inductor L3, the power switch consisting of
the parallel of MOSFETs Q1 and Q2, diode D3, and the output capacitors C3 and C4.
The 300 V varistor RV1, connected between the line and neutral, protects the circuit against
high input voltage transients, while the F1 fuse disconnects the mains in case of shortcircuit.
To meet EMC standards, the board is equipped with an input EMI filter, cutting the switching
noise coming from the boost stage. In particular, L2 filters common mode emissions while
L1, C1, and C2 reduce differential mode emissions.
The L4984D must be supplied by an external power supply, connected between pin #1
(VCC) and pin #2 (GND) of J3.
The capacitor C14, connected to the TIMER (#7) pin, determines the switching frequency.
The resistor divider R12, R16, R22 and R24 provides the information regarding the
instantaneous mains voltage to the L4984D multiplier (MULT, #3), which is used to modulate
the peak current of the boost and the TOFF duration, and is fed to the VFF block.
The resistors R6, R8, R13 with R17 and R18 are dedicated to sensing the output voltage
and feeding, to the inverting input of the error amplifier (INV, #1), the feedback information
necessary to keep the output voltage regulated. Between the INV (#1) and COMP (#2) pins,
components C8, R21 and C11 form the error amplifier compensation network to maintain
the required loop stability.
The inductor peak current is sensed by resistors R27, R30, and R31 placed in series with
the MOSFET source and the derived signal is fed into the current sense pin (CS, #4) of the
L4984D via the filter by R29 and C13. C15 and R28, connected to the VFF pin (#5),
complete an internal peak-holding circuit providing information on the RMS mains voltage,
deriving a DC voltage equal to the peak of the MULT (#3) voltage, which is fed to the
multiplier to compensate the control loop gain dependence on the mains voltage.
The brownout function is also implemented by this pin. A voltage below 0.8 V on the VFF pin
(#5) shuts down (no latch) the IC and brings its consumption to a considerably lower level.
The L4984D starts as the voltage at the pin rises above 0.88 V.
The divider R5, R10, R14 and R23 provides the information regarding the output voltage
level to the L4984D PFC_OK pin (#7), to implement the so-called dynamic OVP protection,
preventing the output voltage from excessive values during the load transients due to the
slow response caused by the intrinsic narrow bandwidth of PFC systems. If the voltage on
the PFC_OK pin (#7) exceeds 2.5 V, the L4984D stops switching, and restarts as the
voltage on the pin falls below 2.4 V.
The open loop protection (also called feedback failure protection) is realized by monitoring
the PFC_OK (#7) and INV (#1) pins. If the voltage on the PFC_OK pin (#7) exceeds 2.5 V,
and at the same time the voltage on the INV pin (#1) falls below 1.66 V, a feedback failure is
assumed and the device is latched off. Normal operation can be resumed only by cycling
2/10
DocID023720 Rev 2
EVL4984-350W
General information and electrical schematics
Vcc (#10), bringing its value lower than the VCCrestart (6 V, typ), before moving up to the
turn-on threshold VCCon (12 V, typ).
Additionally, a remote on/off control input is present. If the voltage on the PFC_OK pin (#7)
is tied below the PFC_OK disable threshold (VPFC_OK_D, 0.23 V typ.), the L4984D is shut
down and the operation is restarted when the voltage on the PFC_OK pin (#7) increases
above the PFC_OK enable threshold (VPFC_OK_E, 0.27 V typ.). L4984D operation can
also be disabled or enabled to properly manage light load or failure by the D2D via the
PFC_OK pin (#7), using pin #3 of J3 (ON/OFF).
DocID023720 Rev 2
3/10
2
1
R14
3M3
R22
4M7
C12
2N2
R10
3M3
R16
3M9
R23
56K
R5
3M3
C13
330pF
C8
68N
F1
FUSE T6.3A
R12
3M9
R24
100K
90-264Vac
J1
RV1
300Vac
C15
1uF
C11
680N
R21
100K
VFF
CS
MULT
U1
L4984D
COMP
INV
R17
56K
JPX2
R4
750K
C5
470N-X2
R28
1M0
5
4
3
2
1
R13
2M2
R8
2M2
R6
2M2
R3
750K
R1
750K
PFC-OK
TIMER
GND
GD
6
7
8
9
10
C16
2N2
1
4
VCC
R18
160K
3
C6
1uF-X2
2
3
L2
3mH - 7A
2
JPX3
C9
470N
C14
680pF
PCB REV. 1
Z1
4
C10
100uF-35V
HS1
HEAT-SINK
_
~
1
3/7
C1
220nF-520V
R29
1K0
C2
1uF-520V
D7
LL4148
D6
LL4148
R33
100R
R32
10R
JPX4
R26
3R9
R25
6R8
R20
3R9
R19
6R8
11
9
L3
700uH
5
2
R27
0R33
GND
ON/OFF
3
VCC
2
1
R31
0R33
1
C17
470nF-520V
J3
22-27-2031
R30
0R33
1
Q2
STF21N65M5
JPX5
L4
2743005112
D3
STTH8S06FP
2
L1
70uH - 7A
C4
100uF - 450V
HS2
HEAT-SINK
Q1
STF21N65M5
C3
100uF - 450V
R2
NTC 1R0-S237
2
D2
D15XB60H
~
DocID023720 Rev 2
3
+
4/10
3
D1
1N5406
JPX1
1
2
3
4
5
J2
+400Vdc
+400Vdc
NC
RTN
RTN
+400Vout
General information and electrical schematics
EVL4984-350W
Figure 1. EVL4984-350W CCM PFC demonstration board electrical schematic
AM13391v1
EVL4984-350W
Test results and significant waveforms
2
Test results and significant waveforms
2.1
Harmonic content measurement
As shown in the illustrations that follow, the circuit can reduce the harmonics well below the
limits of the previously-mentioned standards, from full load down to light load. An output
power of 70 W was chosen because it is near the lowest power limit at which the harmonics
must be limited according to these standards.
Figure 2. EVL4984-350W: compliance with
EN61000-3-2 standard at full load
Vin = 230 Vac - 50 Hz
Pout = 350 W
THD = 16.7 %, PF = 0.976
AM13392v1
Figure 4. EVL4984-350W: compliance with
EN61000-3-2 standard at 70 W load
Vin = 230 Vac - 50 Hz
Pout = 70 W
THD = 17.5 %, PF = 0.814
AM13394v1
Figure 3. EVL4984-350W: compliance with
JEITA-MITI standard at full load
Vin = 100 Vac - 50 Hz
Pout = 350 W
THD = 4.13 %, PF = 0.999
AM13393v1
Figure 5. EVL4984-350W: compliance with
JEITA-MITI standard at 70 W load
Vin = 100 Vac - 50 Hz
Pout = 70 W
THD = 9.9 %, PF = 0.989
DocID023720 Rev 2
AM13395v1
5/10
Bill of material
3
EVL4984-350W
Bill of material
Table 1. EVL4984-350W CCM PFC demonstration board bill of material
Part type/
Case style/
part value
package
C1
220 nF-520 V
7.5X26.5 mm
520 V-FLM CAP - B32673T5224
EPCOS
C2
1 uF-520 V
10.5X26.5 mm
520 V-FLM CAP - B32673Z5105
EPCOS
C3
100 uF-450 V
Dia. 18X40 mm
450 V - aluminum ELCAP-KXG series-105 °C
NipponChemicon
C4
100 uF-450 V
Dia. 18X40 mm
450 V - aluminum ELCAP-KXG series-105 °C
NipponChemicon
C5
470N-X2
10.5X26.5 mm
X2-FLM CAP - B32923A3474M
EPCOS
C6
1 uF-X2
11X26.5 mm
X2-FLM CAP - B32923C3105
EPCOS
C8
68N
0805
100 V CERCAP - general purpose - X7R - 10%
AVX
C9
470N
1206
100 V CERCAP - general purpose - X7R - 10%
KEMET
C10
100 uF-35 V
Dia. 8X11 mm
50 V - aluminum ELCAP-YXF series - 105 °C
Rubycon
C11
680N
0805
25 V CERCAP - general purpose - X7R - 10%
KEMET
C12
10N
0805
50 V CERCAP - general purpose - X7R - 10%
KEMET
C13
330 pF
0805
50 V CERCAP - general purpose - COG - 5%
EPCOS
C14
680 pF
0805
50 V CERCAP - general purpose - COG - 5%
EPCOS
C15
1 uF
1206
50 V CERCAP - general purpose - X7R - 10%
TDK
C16
2N2
0805
50 V CERCAP - general purpose - X7R - 10%
KEMET
C17
470 nF-520 V
7X26.5 mm
520 V - FLM CAP - B32673Z5474K***
EPCOS
D1
1N5406
DO-201
Rectifier - general purpose
Vishay
D2
D15XB60H
DWG
SIngle-phase bridge rectifier
Shindengen
D3
STTH8S06FP
TO-220
Ultrafast high voltage rectifier
ST
D6
LL4148
Mini-melf
High speed signal diode
Vishay
D7
LL4148
Mini-melf
High speed signal diode
Vishay
F1
FUSE T6.3A
4x8.5 mm pitch 5.08
Sub-miniature fuse 392/TE5 - time delay 6.3 A
mm
Littelfuse
HS1
Heatsink
DWG
Heatsink for D2
Meccal
HS2
Heatsink
DWG
Heatsink for Q1, Q2 & D3
Meccal
J1
09-65-2038
DWG
KK PCB Conn. - straight - pitch 3.96 mm - 3 pins
(centrally removed)
Molex
J2
10-16-1051
DWG
KK PCB Conn. - straight - pitch 5.08 mm - 5 pins
(centrally removed)
Molex
J3
22-27-2031
DWG
KK PCB Conn. - straight, pitch 2.54 mm - 3 pins
Molex
JPX1
Shorted
WIRE
Wire jumper
Des.
6/10
Description
DocID023720 Rev 2
Supplier
-
EVL4984-350W
Bill of material
Table 1. EVL4984-350W CCM PFC demonstration board bill of material (continued)
Part type/
Case style/
part value
package
JPX2
Shorted
WIRE
Wire jumper
-
JPX3
Shorted
WIRE
Wire jumper
-
JPX4
Shorted
WIRE
Wire jumper
-
JPX5
Shorted
WIRE
Wire jumper
-
L1
70 uH - 7 A
DWG
DM inductor - 1119.0013
Magnetica
L2
3 mH - 7 A
DWG
EMI filter - 1606.0007
Magnetica
L3
700 uH
DWG
PFC inductor - 2097.0002
Magnetica
L4
2743005112
DWG
Ferrite bead dia. 3.5x6 mm vertical
Q1
STF21N65M5
TO-220FP
N-channel power MOSFET
ST
Q2
STF21N65M5
TO-220FP
N-channel power MOSFETpower MOSFET
ST
R1
750 K
1206
Des.
R2
Description
SMD standard film res. - 1/4 W - 5% - 250 ppm/°C
NTC 1R0-S237 Dia. 15x7 p. 7.5 mm NTC resistor P/N B57237S0109M000
Supplier
Fair-Rite
Vishay
EPCOS
R3
750 K
1206
SMD standard film res. - 1/4 W - 5% - 250 ppm/°C
Vishay
R4
750 K
1206
SMD standard film res. - 1/4 W - 5% - 250 ppm/°C
Vishay
R5
3M3
1206
SMD standard film res. - 1/4 W - 1% - 100 ppm/°C
Vishay
R6
2M2
1206
SMD standard film res. - 1/4 W - 1% - 100 ppm/°C
Vishay
R8
2M2
1206
SMD standard film res. - 1/4 W - 1% - 100 ppm/°C
Vishay
R10
3M3
1206
SMD standard film res. - 1/4 W - 1% - 100 ppm/°C
Vishay
R12
1M0
1206
SMD standard film res. - 1/4 W - 1% - 100 ppm/°C
Vishay
R13
2M2
1206
SMD standard film res. - 1/4 W - 1% - 100 ppm/°C
Vishay
R14
3M3
1206
SMD standard film res. - 1/4 W - 1% - 100 ppm/°C
Vishay
R16
1M0
1206
SMD standard film res. - 1/4 W - 1% - 100 ppm/°C
Vishay
R17
56 K
1206
SMD standard film res. - 1/4 W - 1% - 100 ppm/°C
Vishay
R18
160 K
1206
SMD standard film res. - 1/4W - 1% - 100 ppm/°C
Vishay
R19
6R8
0805
SMD standard film res. - 1/8 W - 5% - 250 ppm/°C
Vishay
R20
3R9
0805
SMD standard film res. - 1/8 W - 5% - 250 ppm/°C
Vishay
R21
100 K
0805
SMD standard film res. - 1/8 W - 5% - 250 ppm/°C
Vishay
R22
1M0
1206
SMD standard film res. - 1/4 W - 1% - 100 ppm/°C
Vishay
R23
56 K
0805
SMD standard film res. - 1/8 W - 1% - 100 ppm/°C
Vishay
R24
24 K
0805
SMD standard film res. - 1/8 W - 5% - 250 ppm/°C
Vishay
R25
6R8
0805
SMD standard film res. - 1/8 W - 5% - 250 ppm/°C
Vishay
R26
3R9
0805
SMD standard film res. - 1/8 W - 5% - 250 ppm/°C
Vishay
R27
0R33
PTH
RSMF1TB - metal film res. - 1 W - 2% - 250
ppm/°C
DocID023720 Rev 2
Akaneohm
7/10
Bill of material
EVL4984-350W
Table 1. EVL4984-350W CCM PFC demonstration board bill of material (continued)
Part type/
Case style/
part value
package
R28
1M0
R29
Des.
Description
Supplier
0805
SMD standard film res. - 1/8 W - 1% - 100 ppm/°C
Vishay
1 K0
0805
SMD standard film res. - 1/8 W - 5% - 250 ppm/°C
Vishay
R30
0R33
PTH
RSMF1TB - metal film res. - 1 W - 2% - 250
ppm/°C
Akaneohm
R31
0R33
PTH
RSMF1TB - metal film res. - 1 W - 2% - 250
ppm/°C
Akaneohm
R32
10R
0805
SMD standard film res. - 1/8 W - 5% - 250 ppm/°C
Vishay
R33
100R
1206
SMD standard film res. - 1/4 W - 5% - 250 ppm/°C
Vishay
RV1
300 Vac
U1
L4984D
Z1
PCB REV. 1
8/10
Dia. 15x5 p. 7.5 mm 300 V metal oxide varistor - B72214S0301K101
SSOP10
CCM PFC controller
DocID023720 Rev 2
EPCOS
ST
EVL4984-350W
4
Revision history
Revision history
Table 2. Document revision history
Date
Revision
Changes
09-Oct-2012
1
Initial release.
31-May-2013
2
Updated title in cover page.
Minor text changes.
DocID023720 Rev 2
9/10
EVL4984-350W
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
ST PRODUCTS ARE NOT AUTHORIZED FOR USE IN WEAPONS. NOR ARE ST PRODUCTS DESIGNED OR AUTHORIZED FOR USE
IN: (A) SAFETY CRITICAL APPLICATIONS SUCH AS LIFE SUPPORTING, ACTIVE IMPLANTED DEVICES OR SYSTEMS WITH
PRODUCT FUNCTIONAL SAFETY REQUIREMENTS; (B) AERONAUTIC APPLICATIONS; (C) AUTOMOTIVE APPLICATIONS OR
ENVIRONMENTS, AND/OR (D) AEROSPACE APPLICATIONS OR ENVIRONMENTS. WHERE ST PRODUCTS ARE NOT DESIGNED
FOR SUCH USE, THE PURCHASER SHALL USE PRODUCTS AT PURCHASER’S SOLE RISK, EVEN IF ST HAS BEEN INFORMED IN
WRITING OF SUCH USAGE, UNLESS A PRODUCT IS EXPRESSLY DESIGNATED BY ST AS BEING INTENDED FOR “AUTOMOTIVE,
AUTOMOTIVE SAFETY OR MEDICAL” INDUSTRY DOMAINS ACCORDING TO ST PRODUCT DESIGN SPECIFICATIONS.
PRODUCTS FORMALLY ESCC, QML OR JAN QUALIFIED ARE DEEMED SUITABLE FOR USE IN AEROSPACE BY THE
CORRESPONDING GOVERNMENTAL AGENCY.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2013 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
10/10
DocID023720 Rev 2