AN-PS0047 EVALPFC-300W-ICE3PCS01G October 2011.pdf,01.10.2011,Documents

Application Note, V1.1, October 2011
EVALPFC-300W-ICE3PCS01G
300W PFC Evaluation Board with CCM PFC
controller ICE3PCS01G
Power Management & Supply
N e v e r
s t o p
t h i n k i n g .
Edition 2011-10-19
Published by Infineon Technologies Asia Pacific,
168 Kallang Way,
349253 Singapore, Singapore
© Infineon Technologies AP 2010.
All Rights Reserved.
Attention please!
The information herein is given to describe certain components and shall not be considered as a guarantee
of characteristics.
Terms of delivery and rights to technical change reserved.
We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement,
regarding circuits, descriptions and charts stated herein.
Information
For further information on technology, delivery terms and conditions and prices please contact your nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements components may contain dangerous substances. For information on the types
in question please contact your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in life-support devices or systems with the express
written approval of Infineon Technologies, if a failure of such components can reasonably be expected to
cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or
system. Life support devices or systems are intended to be implanted in the human body, or to support
and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health
of the user or other persons may be endangered.
EVALPFC-300W-ICE3PCS01G
Revision History:
Previous Version:
Page 12
2011-10
1.0
BOM list update for R3 from 390KΩ to 3.9MΩ
V1.1
300W PFC Evaluation Board with CCM PFC controller ICE3PCS01G
License to Infineon Technologies Asia Pacific Pte Ltd
AN-PS0047
Lim Teik Eng
Liu Jianwei
Li Dong
3
Table of Content
1
Content ........................................................................................................................................................ 5
2
Evaluation Board........................................................................................................................................ 5
3
Technical Specifications ............................................................................................................................. 6
4
Circuit Description ..................................................................................................................................... 6
Line Input .......................................................................................................................................................... 6
Power Stage  Boost Type PFC Converter ....................................................................................................... 6
PWM Control of Boost Converter ..................................................................................................................... 6
5
Circuit Operation ....................................................................................................................................... 7
5.1
Soft Startup ............................................................................................................................................. 7
5.2
Boost Follower ........................................................................................................................................ 7
5.3
Gate Switching Frequency ...................................................................................................................... 7
5.4
Protection Features .................................................................................................................................. 8
5.4.1
Input brown-out protection (BOP) ................................................................................................ 8
5.4.2
Open loop protection (OLP) ......................................................................................................... 8
5.4.3
First over-voltage protection (OVP1) ........................................................................................... 9
5.4.4
Second over-voltage protection (OVP2) ....................................................................................... 9
5.4.5
Peak current limit .......................................................................................................................... 9
5.4.6
IC supply under voltage lockout ................................................................................................... 9
5.4.7
Bulk Voltage Monitor and Enable Function (VBTHL_EN) ......................................................... 9
6
Circuit Diagram........................................................................................................................................ 10
7
PCB Layout............................................................................................................................................... 11
7.1
Top layer view ...................................................................................................................................... 11
7.2
Bottom layer view ................................................................................................................................. 11
8
Component List ........................................................................................................................................ 12
9
Boost Choke Layout ................................................................................................................................. 13
10
Test report................................................................................................................................................. 14
10.1
Load and Line Test .......................................................................................................................... 14
10.2
Load and Line Test in Boost Follower Mode .................................................................................. 15
10.3
Harmonic test according to EN61000-3-2 Class D requirement ...................................................... 17
11
Test Waveforms ........................................................................................................................................ 18
12
References: ................................................................................................................................................ 19
4
1
Content
The evaluation board presented here is a 300W power factor correction (PFC) circuit with
85~265VAC universal input and output of 395VDC rated voltage or 333VDC in boost follower mode.
The continuous conduction mode (CCM) PFC controller ICE3PCS01G is employed in this board to
achieve the unity power factor.
This ICE3PCS01G is specially designed for applications of power supplies used in PC, server,
LCD/PDP TV and Telecom, requesting high efficiency and power factor. The voltage loop
compensation is integrated digitally for better dynamic response and less design effort. Appreciated
for its high integrated design, ICE3PCS01G can achieve full requirements of the PFC application
implemented in the 14-pin in DSO14 package. At the same time the number of peripheral components
is minimized. The gate switching frequency is adjustable from 21kHz to 250kHz and able to
synchronize with external switching frequency from 50kHz to 150kHz. In order to improve the power
conversion efficiency further, the CoolMOSTM CP series and high voltage silicon carbide (SiC)
schottky diode thinQ!TM are used into this boost type PFC circuit.
2
Evaluation Board
Figure 1
ICE3PCS01G Demoboard
5
3
Technical Specifications
Input voltage
85VAC~265VAC
Input frequency
47~63Hz
Output voltage and current
395VDC, 0.75A
Output power
~ 300W
Average efficiency
>96% at 115VAC
Switching Frequency
21kHz~250kHz
4
Circuit Description
Line Input
The AC line input side comprises the input fuse F1 as over-current protection. The choke L1, X2capacitors CX1/CX2 and Y1-capacitor CY1/CY2 are used to suppress common mode noise as well as
differential mode noise. RT1 is placed in series to limit inrush current during each power on. A relay is
mounted across the RT1 to short the resistor when VOUT is higher than 95% rated voltage.
Power Stage  Boost Type PFC Converter
After the bridge rectifier BR1, there is a boost type PFC converter consisting of L2, Q2, D3 and C3.
The third generation CoolMOS™ IPP60R199P is used as the power switch Q2. BR1, Q2 and SiC
Diode D3 share the same heat sink so that the system heat can be equably spread. Output capacitor
C3 provides energy buffering to reduce the output voltage ripple (100Hz) to the acceptable level and
meet the holdup time requirement.
PWM Control of Boost Converter
The ICE3PCS01G is a 14-pins control IC for power factor correction converters. It is suitable for wide
range line input applications from 85 to 265 VAC with overall efficiency above 96%. The IC supports
converters in boost topology and it operates in continuous conduction mode (CCM) with average
current control.
The IC operates with a cascaded control; the inner current loop and the outer voltage loop. The inner
current loop of the IC controls the sinusoidal profile for the average input current. It uses the
dependency of the PWM duty cycle on the line input voltage to determine the corresponding input
current. This means the average input current follows the input voltage as long as the device operates
in CCM. Under light load condition, depending on the choke inductance, the system may enter into
discontinuous conduction mode (DCM) resulting in a higher harmonics but still meeting the Class D
requirement of IEC 1000-3-2.
The outer voltage loop controls the output bulk voltage, integrated digitally within the IC. Depending
on the load condition, internal PI compensation output is converted to an appropriate DC voltage
which controls the amplitude of the average input current.
The IC is equipped with various protection features to ensure safe operating condition for both the
system and device.
6
5
Circuit Operation
5.1
Soft Startup
During power up when the VOUT is less than 95% of the rated level, internal voltage loop output
increases from initial voltage under the soft-start control. This results in a controlled linear increase of
the input current from 0A thus reducing the current stress in the power components.
Once VOUT has reached 95% of the rated level, the soft-start control is released to achieve good
regulation and dynamic response and VB_OK pin outputs 5V indicating PFC output voltage in normal
range.
5.2
Boost Follower
The IC provides adjustable lower step of bulk voltage in case of low line input and light output power.
The low line condition is determined when pin BOP voltage is less than 2.3V. Pin BOFO is connected
to PWM feedback voltage through a voltage divider, representing the output power. The light load
condition is determined when pin BOFO voltage is less than 0.5V. Once these two conditions are met
in the same time, a 20uA current source is flowing out of pin VSENSE so that the bulk voltage should
be reduced to a lower level in order to keep the VSENSE voltage same as the internal reference 2.5V.
The reduced bulk voltage can be designed by upper side resistance of voltage divider from pin
VSENSE. Thus the low side resistance is designed by the voltage divider ratio from the reference
2.5V to the rated bulk voltage. An internal 300kΩ resistor will be paralleled with external low side
resistor of BOFO pin to provide the adjustable hysteresis for entry/exit power when boost follower is
activated.
The boost follower feature will be disabled internally during PFC soft-start in order to prevent bulk
voltage oscillation due to the unstable PWM feedback voltage. This feature can also be disabled
externally by pulling up pin BOFO higher than 0.5V continuously.
5.3
Gate Switching Frequency
The switching frequency of the PFC converter can be set with an external resistor RFREQ at pin FREQ
with reference to pin SGND. The voltage at pin FREQ is typical 1V. The corresponding capacitor for
the oscillator is integrated in the device and the RFREQ/frequency is given in Figure 2. The
recommended operating frequency range is from 21 kHz to 250 kHz. As an example, a RFREQ of 68kΩ
at pin FREQ will set a switching frequency FSW of 65 kHz typically.
7
Frequency vs Resistance
260
240
Resistance
/kohm
Frequency
/kHz
Resistance
/kohm
Frequency
/kHz
220
15
278
110
40
17
249
120
36
20
211
130
34
30
141
140
31.5
160
40
106
150
29.5
140
50
86
169
26.2
120
60
74
191
25
70
62
200
23
80
55
210
21.2
80
90
49
221
20.2
60
100
43
232
19.2
200
Frequency/kHz
180
100
40
20
0
10
20
30
40
50
60
70
80
90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250
Resistance/kohm
Figure 2
Frequency setting
The switching frequency can be synchronized to the external pulse signal after 6 external pulses
delay once the voltage at the FREQ pin is higher than 2.5V. The synchronization means two points.
Firstly, the PFC switching frequency is tracking the external pulse signal frequency. Secondly, the
falling edge of the PFC signal is triggered by the rising edge of the external pulse signal. The external
R20 combined with R21 and the external diode, D6 can ensure FREQ pin voltage to be kept between
1.0V (clamped internally) and 5V (maximum pin voltage). If the external pulse signal has disappeared
longer than 108us (typical) the switching frequency will be synchronized to internal clock set by the
external resistor R20.
5.4
Protection Features
5.4.1
Input brown-out protection (BOP)
ICE3PCS01G provides a new BOP feature whereby it senses directly the input voltage for Input
Brown-Out condition via an external resistor/capacitor/diode network. This network provides a filtered
value of VIN which turns the IC on when the voltage at pin 9 (BOP) is more than 1.25V. The IC enters
into the fault mode when BOP goes below 1.0V. The hysteresis prevents the system to oscillate
between normal and fault mode. Note also that the peak of VIN needs to be at least 20% of the rated
VOUT in order to overcome open loop protection and power up system.
5.4.2
Open loop protection (OLP)
The open loop protection is available for this IC to safe-guard the output. Whenever voltage at pin
VSENSE falls below 0.5V, or equivalently VOUT falls below 20% of its rated value, it indicates an open
loop condition (i.e. VSENSE pin not connected). In this case, most of the blocks within the IC will be
shutdown. It is implemented using a comparator with a threshold of 0.5V.
8
5.4.3
First over-voltage protection (OVP1)
Whenever VOUT exceeds the rated value by 8%, the first over-voltage protection OVP1 is active. This
is implemented by sensing the voltage at pin VSENSE with respect to a reference voltage of 2.7V. A
VSENSE voltage higher than 2.7V will immediately block the gate signal. After bulk voltage falls below
the rated value, gate drive resumes switching again.
5.4.4
Second over-voltage protection (OVP2)
The second OVP (OVP2) is provided in case that the first one fails due to the aging or incorrect
resistors connected to the VSENSE pin. This is implemented by sensing the voltage at pin OVP with
respect to a reference voltage of 2.5V. When voltage at OVP pin is higher than 2.5V, the IC will
immediately turn off the gate, thereby preventing damage to bus capacitor.
When the bulk voltage drops out of the hysteresis, which is below 2.3V the IC can be latched further
or begin auto soft-start. These two protection modes are distinguished through detecting the external
equivalent resistance connecting to VBTHL_EN pin after VCC is higher than UVLO threshold. If the
equivalent resistance is higher than 100kΩ the IC selects latch mode for second OVP, otherwise
auto soft-start mode.
In normal operation the trigger level of OVP2 should be designed higher than OVP1. However in the
condition of mains transient overshoot the bulk voltage may be pulled up to the peak value of mains
that is higher than the threshold of OVP1 and OVP2. In this case the OVP1 and OVP2 are triggered in
the same time the IC will shut down the gate drive until bulk voltage falls out of the two protection
hysteresis, then resume the gate drive again
5.4.5
Peak current limit
The IC provides a cycle by cycle peak current limitation (PCL). It is active when the voltage at pin
ISENSE reaches -0.2V. This voltage is amplified by a factor of -5 and connected to comparator with a
reference voltage of 1.0V. A deglitcher with 200ns after the comparator improves noise immunity to
the activation of this protection. In other words, the current sense resistor should be designed lower
than -0.2V PCL for normal operation.
5.4.6
IC supply under voltage lockout
When VCC voltage is below the under voltage lockout threshold VCCUVLO, typical 11V, IC is off and the
gate drive is internally pull low to maintain the off state. The current consumption is down to 1.4mA
only.
5.4.7
Bulk Voltage Monitor and Enable Function (VBTHL_EN)
The IC monitors the bulk voltage status through VSENSE pin and output a TTL signal to enable PWM
IC or control inrush relay. During soft-start once the bulk voltage is higher than 95% rated value, pin
VB_OK outputs a high level. The threshold to trigger the low level is decided by the pin VBTHL
voltage adjustable externally.
When pin VBTHL is pulled down externally lower than 0.5V most function blocks are turned off and
the IC enters into standby mode for low power consumption. When the disable signal is released the
IC recovers by soft-start.
9
6
Circuit Diagram
Figure 3
Schematic of 300W PFC demo board
10
7
PCB Layout
7.1
Top layer view
7.2
Bottom layer view
11
8
Component List
Designator
Part Type
Description
BR1
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C13
CX1
CX2
CY1
CY2
D1
D2
D3
D4
D5
D6
F1
IC1
J1
J2
J3
J4
J5
L1
L2
Q1
Q2
R1
R2
R3
R4
R5A
R5
R6
R7
R8
R9
R10
R11
R12
8A, 400V
10uF/50V
0.1uF/630V
220uF/450V
1.5 uF/50V
1.5 uF/50V
100pF/50V
100uF/25V
1uF/25V
4.7nF/50V
10nF/50V
10pF/50V
4.7nF/50V
0.68uF, X1, 275V
0.68uF, X1, 275V
2.2nF, Y2, 250V
2.2nF, Y2, 250V
1N4148
1N5408
IDH04S60C
1N4007
1N4007
1N4148
5A
ICE3PCS01G
Jumper
Jumper
Jumper
Jumper
Jumper
2*3.9mH
750uH
BC517
IPP60R199CP
100R/0.25W, 5%
10k/0.25W, 1%
3.9M/0.25W, 1%
68/0.25W, 1%
0.33/0.5W, 5%
0.1/0.5W, 5%
0.1/0.5W, 5%
0.1/0.5W, 5%
3.3/0.25W, 1%
10k/0.25W, 5%
1.5M/0.25W, 1%
2M/0.25W, 1%
130k/0.25W, 1%
Bridge Rectifier
Electrolytic Cap
Ceramic Cap
Electrolytic Cap
Ceramic Cap
Ceramic Cap
Ceramic Cap
Electrolytic Cap
Ceramic Cap
Ceramic Cap
Ceramic Cap
Ceramic Cap
Ceramic Cap
Ceramic Cap
Ceramic Cap
Ceramic Cap
Ceramic Cap
Diode
Diode
Diode
Diode
Diode
Diode
Fuse
DSO-14
Connector (BOFO)
Connector (SYNC)
Connector (VCC)
Connector (VIN)
Connector (VOUT)
CM Choke
PFC Choke
NPN Transistor
Power MOSFET
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Metal Film Resistor
Metal Film Resistor
Metal Film Resistor
Metal Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
12
Manufacturer/ Part No.
Vishay / KBU8G
Epcos / B32652A6104J
Epcos / B43304C5227M
Epcos / B32922C3474M
Epcos / B32922C3474M
Epcos / B81123C1222M000
Epcos / B81123C1222M000
Vishay / 1N5408
Infineon Technologies
Vishay / 1N4007
Vishay /1N4007
Infineon Technologies
Epcos / B82725J2602N20
Infineon Technologies
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
RT1
VAR1
9
3.9M/0.25W, 1%
330k/0.25W, 1%
1.5M/0.25W, 1%
2M/0.25W, 1%
200k/0.25W, 1%
200k/0.25W, 1%
200k/0.25W, 1%
68k/0.25W, 1%
130k/0.25W, 1%
27k/0.25W, 1%
62k/0.25W, 1%
24k/0.25W, 1%
560k/0.25W, 1%
S237/5
S10K275
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
Carbon Film Resistor
NTC Thermistor
Varistor
Boost Choke Layout
Core: PQ-core PQ3535 (TDK)
Material: PC95
Inductance: L=750uH
13
Epcos / B57237S509M
Epcos / B72210S271K101
10
Test report
10.1
Load and Line Test
Input
85Vac
115Vac
230Vac
265Vac
VIN
IIN
PIN
VOUT
IOUT
POUT
Eff.
PF
84.88
0.27
21.99
395.70
0.05
20.90
95.07
0.98
84.75
0.50
42.25
395.70
0.10
40.43
95.69
0.99
84.64
0.72
60.55
395.70
0.15
57.99
95.78
0.99
84.46
0.98
82.66
395.70
0.20
79.16
95.76
1.00
84.32
1.22
102.56
395.70
0.25
98.52
96.06
1.00
83.99
1.83
153.71
395.70
0.37
147.67
96.07
1.00
83.59
2.49
207.71
395.70
0.50
199.03
95.82
1.00
83.29
3.10
257.86
395.70
0.62
246.26
95.50
1.00
82.89
3.76
310.84
395.70
0.75
295.84
95.17
1.00
114.84
0.21
21.95
395.70
0.05
20.90
95.19
0.93
114.75
0.38
42.36
395.70
0.10
40.84
96.43
0.98
114.67
0.53
59.97
395.70
0.15
57.98
96.68
0.99
114.53
0.72
81.78
395.70
0.20
79.33
97.01
0.99
114.43
0.89
101.66
395.70
0.25
98.51
96.90
1.00
114.18
1.34
152.27
395.70
0.37
147.69
96.99
1.00
113.90
1.81
205.23
395.70
0.50
198.99
96.96
1.00
113.69
2.24
254.16
395.70
0.62
246.15
96.85
1.00
113.36
2.70
305.67
395.70
0.75
295.73
96.75
1.00
229.84
0.16
21.90
395.70
0.05
20.89
95.37
0.58
229.79
0.23
42.15
395.70
0.10
40.85
96.92
0.80
229.76
0.30
59.43
395.70
0.15
57.96
97.54
0.88
229.69
0.38
81.17
395.70
0.20
79.35
97.75
0.92
229.64
0.46
100.56
395.70
0.25
98.48
97.93
0.95
229.52
0.67
150.32
395.70
0.37
147.66
98.23
0.97
229.38
0.90
202.36
395.70
0.50
198.91
98.30
0.98
229.27
1.10
250.09
395.70
0.62
245.99
98.36
0.99
229.10
1.32
300.44
395.70
0.75
295.58
98.38
0.99
264.87
0.17
21.85
395.70
0.05
20.87
95.55
0.48
264.83
0.22
42.14
395.70
0.10
40.86
96.95
0.71
264.80
0.28
59.52
395.70
0.15
57.96
97.38
0.81
264.76
0.35
81.24
395.70
0.20
79.37
97.70
0.87
264.69
0.42
100.58
395.70
0.25
98.46
97.89
0.92
264.59
0.60
150.30
395.70
0.37
147.68
98.26
0.95
264.47
0.78
202.05
395.70
0.50
198.90
98.44
0.97
264.37
0.96
249.75
395.70
0.62
245.97
98.49
0.98
264.22
1.15
299.93
395.70
0.75
295.54
98.54
0.99
14
ICE3PCS01G Efficiency
100.00
85Vac
115Vac
230Vac
265Vac
99.00
Efficiency(%)
98.00
97.00
96.00
95.00
94.00
93.00
0.00
50.00
100.00
150.00
200.00
250.00
300.00
Output Power (W)
Figure 4
PFC stage efficiency
ICE3PCS01G PF
1.00
0.90
PF
0.80
0.70
85Vac
115Vac
230Vac
265Vac
0.60
0.50
0.40
0.00
50.00
100.00
150.00
200.00
250.00
300.00
Output Power (W)
Figure 5
Power factor
10.2
Load and Line Test in Boost Follower Mode
Input
85Vac
Vin
Iin
Pin
Vout
Iout
Pout
Eff.
PF
84.88
0.28
23.52
333.53
0.07
22.51
95.69
0.98
84.79
0.47
39.38
333.53
0.11
38.09
96.72
0.99
84.67
0.74
62.22
333.53
0.18
59.82
96.14
1.00
84.57
0.96
80.87
333.53
0.23
77.83
96.25
1.00
84.44
1.23
103.28
333.53
0.30
99.47
96.32
1.00
84.15
1.85
155.70
333.53
0.45
149.83
96.23
1.00
83.87
2.45
205.07
333.53
0.59
196.81
95.97
1.00
83.55
3.13
260.78
333.53
0.75
249.27
95.59
1.00
83.26
3.77
313.24
333.53
0.89
298.15
95.18
1.00
15
115Vac
114.84
0.22
23.50
333.53
0.07
22.50
95.75
0.94
114.78
0.35
39.46
333.53
0.12
38.43
97.39
0.97
114.69
0.54
61.59
333.53
0.18
59.80
97.09
0.99
114.61
0.70
80.09
333.53
0.23
77.80
97.14
0.99
114.52
0.90
102.44
333.53
0.30
99.47
97.10
1.00
114.31
1.35
154.17
333.53
0.45
149.78
97.15
1.00
114.11
1.78
202.70
333.53
0.59
196.77
97.07
1.00
113.88
2.26
257.07
333.53
0.75
249.23
96.95
1.00
113.67
2.71
307.99
333.53
0.89
297.98
96.75
1.00
ICE3PCS01G (Boost Follower Mode) Efficiency
98.00
97.50
Efficiency(%)
97.00
96.50
96.00
95.50
95.00
85Vac
115Vac
94.50
94.00
0.00
50.00
100.00
150.00
200.00
250.00
300.00
Output Power (W)
Figure 6
Power stage efficiency at boost follower mode
ICE3PCS01G (Boost Follower mode) PF
1.00
0.99
0.98
PF
0.97
0.96
0.95
85Vac
115Vac
0.94
0.93
0.92
0.00
50.00
100.00
150.00
Output Power (W)
Figure 7
Power factor at boost follower mode
16
200.00
250.00
300.00
10.3
Harmonic test according to EN61000-3-2 Class D requirement
Test condition I: 85VAC input, full load (300W output)
class D
measurement
1.2
1
1
0.8
0.8
current (A)
current (A)
measurement
1.2
0.6
class D
0.6
0.4
0.4
0.2
0.2
0
0
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
3
39
5
7
9
Figure 8
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
harmonics (Vac=85V Po=300W Kp=1, Boost Follower)
harmonics (Vac=85V Po=300W Kp=1)
Harmonics in normal operation
Figure 9
Harmonics in boost follower
Test condition II: 85VAC input, 10% of full load (30W output)
class D
measurement
0.12
0.1
0.1
0.08
0.08
current (A)
current (A)
measurement
0.12
0.06
class D
0.06
0.04
0.04
0.02
0.02
0
0
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
3
39
5
Figure 10
7
9
11
13
15
17
19
21
23
25
27
29
31
33
Harmonics in normal operation
Figure 11
Harmonics in boost follower
Test condition III: 265VAC input
measurement
class D
measurement
1.2
0.12
1
0.1
class D
0.08
current (A)
current (A)
0.8
0.6
0.4
0.06
0.04
0.2
0.02
0
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
0
39
harmonics (Vac=265V Po=30W Kp=1, Boost Follower)
harmonics (Vac=265V Po=300W Kp=1, Boost Follower)
Figure 12
35
harmonics (Vac=85V Po=30W Kp=1, Boost Follower)
harmonics (Vac=85V Po=30W Kp=1)
Harmonics at 300W output
Figure 13
17
Harmonics at 30W output
37
39
11
Test Waveforms
BOP triggered startup
Figure 14
VCC triggered startup
Startup test at 85VAC, 300W
During startup the average current of PFC choke increases from zero to maximum limited by PCL and
PFC output voltage rises gradually with very slight overshoot.
Pout from 0W to 300W
Figure 15
Pout from 300W to 0W
Load jump test at 85VAC
The under shoot of output voltage is only 60V when load jump from no load to full load at 85Vac while the
overshoot is within 35V vice versa. The choke current shows no distortion during load dynamic change.
Latch Mode
Figure 16
Auto Restart Mode
OVP2 test
18
When OVP2 happens the gate drive can be latched off continuously as shown in left picture or enter auto
startup as shown in right picture depending on the equivalent resistance at VBTHL pin.
Enter brown-out and leave brown-out , Pout: 300W
Figure 17
Open Loop protection at 85V, Pout: 150W
Brownout and OLP test
The gate drive is latched off once BOP pin voltage is lower than 1V and initiates another soft-startup once
BOP voltage is higher than 1.25V as shown in the left picture.
The gate drive can also be latched off once Vsense pin voltage is below 0.5V indicating an inadequate
output voltage and initiates another soft-startup once Vsense voltage is higher than 0.5V as shown in the
right picture.
Enter Boost Follower mode
Figure 18
Exit Boost Follower mode
Boost follower mode test
During low line condition the output voltage is able to step down to 329V by pulling BOFO pin voltage
below 0.5V in left picture and recovers to normal output voltage 400V vice versa in right picture.
12
References:
[1]
ICE3PCS01G datasheet, Infineon Technologies AG, 2010.
[2]
Luo Junyang, Liu Jianwei and Jeoh Meng Kiat, “Design tips for CCM PFC controller ICE2PCSxx”,
Application note, Infineon Technologies, 2008.
[3]
Liu Jianwei, Luo Junyang and Jeoh Meng Kiat, “300W PFC evaluation board with CCM PFC
controller ICE2PCS01”, Application note, Infineon Technologies, 2009.
[4]
Luo Junyang, Liu Jianwei and Jeoh Meng Kiat, “ICE1PCS01 based boost type CCM PFC design
guide – control loop modeling”, Application note, Infineon Technologies, 2007.
19
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