New CCM PFC Controller with BiCMOS technology: ICE2PCS01 Infineon SMPS Seminar 25 Aug, 2006 - Shenzhen
SMPS Seminar SZ2006-08
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New CCM PFC Controller with BiCMOStechnology: ICE2PCS01
Infineon SMPS Seminar
25 Aug, 2006 - Shenzhen
SMPS Seminar SZ2006-08
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Features of CCM-PFC-IC ICE2PCS01 --- functional pin to pin compatible with ICE1PCS01
• Continuous conduction mode (CCM) Power
Factor Correction IC
• Low pin count (DIP- / SO-8)
• Simple Design
• Average current control without direct sinwave
reference signal sensing
• Numerous protection functions
• Designed for boost topology
• Stable output voltage during no-load operation
• Adjustable operating frequency (50kHz - 250kHz
for ICE2PCS01,ICE2PCS02 67kHz Fixed)
• Enhanced dynamic response
• Fulfills class D requirements of IEC 1000-3-2
• Continuous conduction mode (CCM) Power
Factor Correction IC
• Low pin count (DIP- / SO-8)
• Simple Design
• Average current control without direct sinwave
reference signal sensing
• Numerous protection functions
• Designed for boost topology
• Stable output voltage during no-load operation
• Adjustable operating frequency (50kHz - 250kHz
for ICE2PCS01,ICE2PCS02 67kHz Fixed)
• Enhanced dynamic response
• Fulfills class D requirements of IEC 1000-3-2
V, IOUT
IN
IL
IIN
SMPS Seminar SZ2006-08
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Application Circuit of CCM PFC Controller ICE2PCS01
L1
T1
R1
R2
COUT
RSense
VOUT = 400V DC
VIN = 85V ...265V AC
EMI Filter
R3
GATE GND VSENSEISENSE
C1 RFREQC2
R4
C3
VCOMPFREQICOMP
VCCAuxiliary Supply ICE2PCS01
Rectifier
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Parameters comparison between ICE1PCS01 and ICE2PCS01
Typ. 11.0VTyp. 10.2VVCC Turn-Off ThresholdTyp. 12.0VTyp. 11.2VVCC Turn-On Threshold11~26V10~21VVcc operating range3V±2%5V±2%Internal reference voltageBiCMOSBipolarDevice technology
ICE2PCS01ICE1PCS01Parameters
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Comparison between ICE1PCS01 and ICE2PCS01
faster soft start30uA current source charge Vcomp capacitor
10uA current source charge Vcomp capacitorSoft start
average current modeaverage current modeoperation mode
yes, typical threshold |Visense|=1.08V
yes, typical threshold |Visense|=1.08Vpeak current limit
yes, typical threshold |Visense|>=0.73V
yes, typical threshold |Visense|>=0.73Vsoft overcurrent control
yes, threshold is Vsense<0.6Vyes, threshold is Vsense<0.8Vopen loop protection
this function is not much useful.No.
PFC is shutdown when Vout<50% and restart immediately
output undervoltageprotection
yes, thresholds are +/-5%yes, thresholds are +/-5%enhance dynamic response
much fast and reliable
directly shutdown gate drive
reduce internal PWM control voltage via enhance dynamic response +5% threshold
Output overvoltageprotection
no audible noiseNo jitteringJittering due to grounding noiseOperating frequency
Advantages of ICE2PCS01ICE2PCS01ICE1PCS01Features
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General control stage block with feedforward
Small bandwidth voltage control loop, high bandwidth current control loop
The multiplier is the key element of the scheme
Feedforward technique compensates input voltage variations
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ICE2PCS01--- Average Current Control how to regulate current without sinewave reference signal sensing
In CCM mode boost converter, DOFF is proportional to VIN. In CCM mode boost converter, DOFF is proportional to VIN.
OUT
INOFF V
VD =
Average current control: regulate the IIN which is proportional to DOFF. The ramp voltage is generated by oscillator and the amplitude is controlled by VCOMP voltage.
Average current control: regulate the IIN which is proportional to DOFF. The ramp voltage is generated by oscillator and the amplitude is controlled by VCOMP voltage.
INOFFIN VDI ∝∝
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Normal operation (full load 300W)
Input Current
Input Voltage
Input Current
Input Voltage
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Start up – soft start behavior
ICE2PCS01:
• VCOMP is charged by a constant 30µA during startup.
• VCOMP rises linearly and so does the amplitude of the input current.
• The soft start is finished when the output voltage VOUT reaches 85% of its rated level.
• In normal operation, the IC operates with a higher maximum current at OTA1 and therefore with a higher voltage loop gain in order to improve the dynamic behavior of the device.
ICE2PCS01:
• VCOMP is charged by a constant 30µA during startup.
• VCOMP rises linearly and so does the amplitude of the input current.
• The soft start is finished when the output voltage VOUT reaches 85% of its rated level.
• In normal operation, the IC operates with a higher maximum current at OTA1 and therefore with a higher voltage loop gain in order to improve the dynamic behavior of the device.
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Startup at 85VAC --- soft start
No load
VoutIin
Vcomp
Vcc
Full load
Vbulk rising time is around 70ms when reaching 300VDC.
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No Frequency Jitter after startup
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Icomp pin short to GND test- worst case (265VAC, Iout=0A, AC on-off-on)
Vout
Vsense
VgateVgate is switched-off when Vsensereached 3.25V. Voutovershoot is around 430VDC
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Enhance Dynamic response
• Inherent PFC dynamic loop compensation is always implemented with low bandwidth in order not to make the response for 2*fL ripple.
• In case of load jump, regulation circuit can not response fast enough and it will lead to large output voltage overshoot or drop.
• Enhance dynamic response: Whenever output voltage exceeds by ±5%, it will act on the nonlinear gain block to affect the duty cycle directly.
• Inherent PFC dynamic loop compensation is always implemented with low bandwidth in order not to make the response for 2*fL ripple.
• In case of load jump, regulation circuit can not response fast enough and it will lead to large output voltage overshoot or drop.
• Enhance dynamic response: Whenever output voltage exceeds by ±5%, it will act on the nonlinear gain block to affect the duty cycle directly. VDC
VSENSE
Nonlinear gain
-5% +5%
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Enhance dynamic response(85VAC, Iout drop from 0.75A to 0A)
Vout
Iout
Vgate
Vsense
The gate was turned off when Vsensevoltage reached its threshold
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cont’Enhance dynamic response(85VAC, Iout jump from 0A to 0.75A)
Vout
Iout
Vgate
Vsense
Vsense drops to 2,85V, then Gate Duty increases rapidly
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Open Loop Protection
Protection Logic
VSENSEWhenever VSENSE voltage falls below 0.6V, or equivalently VOUT falls below 20% of its rated value, it indicates an open loop condition (i.e. VSENSE pin not connected) or an insufficient input voltage VIN for normal operation. In this case, most of the blocks within the IC will be shutdown.
Whenever VSENSE voltage falls below 0.6V, or equivalently VOUT falls below 20% of its rated value, it indicates an open loop condition (i.e. VSENSE pin not connected) or an insufficient input voltage VIN for normal operation. In this case, most of the blocks within the IC will be shutdown.
0.6V
VoutIin
Vgate
VsenseMax O/P Voltage is 420V
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Soft Over Current Control (55VAC, Iout=1.5A)
Vsense
Iin
The current was limited around 4A
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Peak Current limit (line jump from 85 to 265VAC, 300W)
Vin
VIsense
Iin
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Harmonic Analysis (85VAC)
Full load300W
Light load28W
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Harmonic Analysis (265VAC)
Full load300W
Light load28W
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Test Data and Plot
00.10.20.30.40.50.60.70.80.9
1
0 50 100 150 200 250 300 350
Pout (W)
PF
85
110
220
265