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PDF CM6502THH Data sheet ( Hoja de datos )
| Número de pieza | CM6502THH | |
| Descripción | EPA/90+ ZVS-Like PFC CONTROLLER | |
| Fabricantes | Champion Microelectronic | |
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CM6502THH (Turbo-Speed PFC)
http://www.championmicro.com.tw
EPA/90+ ZVS-Like PFC CONTROLLER
Design for High Efficient Power Supply at both Full Load and Light Load
GENERAL DESCRIPTION
CM6502THH is a ZVS-Like Single PFC and it is designed
to meet 90+ spec. (total efficiency). It has the following key
features.
1.) Around 2% efficiency gain when the output load is
below 40% of the full load
2.) 420V bulk capacitor value can be reduced, and also
PFC Boost Capacitor ripple current can be reduced
3.) Turbo Speed PFC may reduce 420 Bulk Capacitor
size further
4.) A PGB function is designed for interfacing to next
stage controller or the House Keeping IC at
secondary side. It has a customer programmable
low threshold PGTHL
5.) “Remember it was Light Load” function and
“Remember it was Full Load” function may reduce
PFC 420V Bulk Capacitor size further. It boosts the
total efficiency as well.
6.) Initially, Vin at 230Vac , IC internal determine is low
line; therefore at light load, Bulk capacitor 380V can
drop to 355V
7.) No Load Consumption can be reduced to 290mW at
270VAC
8.) Better Power Factor and Better THD
9.) Clean Digital PFC Brown Out
10.) The stress over the entire external power device is
reduced and EMI noise reduced
11.) Superior Surge Noise Immunity
CM6502THH is designed to meet the EPA/90+ regulation.
With the proper design, its efficiency of power supply can
easily approach 90+.
FEATURES
Patents Pending
23V Bi-CMOS process.
Designed for EPA/90+efficiency
Selectable Boost output from 380V to 355V during light
load
Customer Programmable the Low Threshold of PGB
comparator at PGTHL pin
“Remember It was Light Load” function to improve the
efficiency
“Remember It was Full Load” function to improve the
efficiency
Initially, Vin at 230Vac , IC internal determine is low line;
therefore at light load, Bulk capacitor 380V can drop to
355V
Clean Digital PFC Brown Out
All high voltage resistors can be greater than 5 Mega
ohm (5 Mega to 8 Mega ohm) to improve the no load
consumption.
Rail to rail CMOS Drivers with on, 60 ohm and off, 30
ohm with 17V zeners.
Fast Start-UP Circuit without extra bleed resistor to aid
VCC reaches 13V sooner.
Low start-up current (50uA typ.)
Low operating current (2.1mA typ.)
Adjustable Long Delay Time for Line Sagging
(Up to 2 Second)
16.5V VCC shunt regulator
Dynamic Soft PFC to ease the stress of the Power
Device and Ease the EMI-filter design.
Better Power Factor and Better THD
Average current, continuous or discontinuous boost
leading edge PFC.
Current fed Gain Modulator for improved noise immunity.
Gain Modulator is a constant maximum power limiter.
Precision Current Limit, over-voltage protection, UVLO,
and soft start, and Reference OK.
2011/06/01 Rev. 1.0
Champion Microelectronic Corporation
1
1 page  
CM6502THH (Turbo-Speed PFC)
http://www.championmicro.com.tw
EPA/90+ ZVS-Like PFC CONTROLLER
Design for High Efficient Power Supply at both Full Load and Light Load
ORDERING INFORMATION
Part Number
Temperature Range
CM6502THHXIS*
-40℃ to 125℃
CM6502THHXISTR*
-40℃ to 125℃
CM6502THHXIP*
-40℃ to 125℃
*Note: X : Suffix for Halogen Free and PB Free Product
TR : Package is Typing Reel
Package
14-Pin Narrow SOP (S14)
14-Pin Narrow SOP (S14)
14-Pin Narrow DIP (P14)
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are those values beyond which the device could be permanently damaged.
Parameter
Min. Max.
VCC 18
IEAO
0 VREF+0.3
ISENSE Voltage
-5 0.7
PFC OUT
GND – 0.3
VCC + 0.3
IREF
3.5
IAC Input Current
1
Peak PFC OUT Current, Source or Sink
0.5
PFC OUT, Energy Per Cycle
1.5
Junction Temperature
Storage Temperature Range
150
-65 150
Operating Temperature Range
-40 125
Lead Temperature (Soldering, 10 sec)
Thermal Resistance (θJA)
Plastic DIP
Plastic SOIC
260
80
105
Units
V
V
V
V
mA
mA
A
μJ
℃
℃
℃
℃
℃/W
℃/W
2011/06/01 Rev. 1.0
Champion Microelectronic Corporation
5
5 Page 
CM6502THH (Turbo-Speed PFC)
http://www.championmicro.com.tw
EPA/90+ ZVS-Like PFC CONTROLLER
Design for High Efficient Power Supply at both Full Load and Light Load
Dynamic Soft PFC (patent pending)
Dynamic Soft PFC is the main feature of CM6502THH.
Dynamic Soft PFC is to improve the efficiency, to reduce
power device stress, to ease EMI, and to ease the monotonic
output design while it has the more protection such as the
short circuit with power-foldback protection. Its unique
sequential control maximizes the performance and the
protections among steady state, transient and the power on/off
conditions.
PFC Section:
Gain Modulator
Figure 1 shows a block diagram of the PFC section of the
CM6502THH. The gain modulator is the heart of the PFC, as it
is this circuit block which controls the response of the current
loop to line voltage waveform and frequency, rms line voltage,
and PFC output voltages. There are three inputs to the gain
modulator. These are:
1. A current representing the instantaneous input voltage
(amplitude and wave-shape) to the PFC. The rectified AC
input sine wave is converted to a proportional current via a
resistor and is then fed into the gain modulator at IAC.
Sampling current in this way minimizes ground noise, as is
required in high power switching power conversion
environments. The gain modulator responds linearly to this
current.
2. A voltage proportional to the long-term RMS AC line voltage,
derived from the rectified line voltage after scaling and
filtering. This signal is presented to the gain modulator at
VRMS. The gain modulator’s output is inversely proportional
to VRMS2. The relationship between VRMS and gain is
illustrated in the Typical Performance Characteristics of this
page.
3. The output of the voltage error amplifier, VEAO. The gain
modulator responds linearly to variations in this voltage.
The output of the gain modulator is a current signal, in the
form of a full wave rectified sinusoid at twice the line
frequency. This current is applied to the virtual-ground
(negative) input of the current error amplifier. In this way the
gain modulator forms the reference for the current error loop,
and ultimately controls the instantaneous current draw of the
PFC from the power line. The general formula of the output of
the gain modulator is:
IAC× (VEAO - 0.7V)
Imul =
V2
RMS
x constant
(1)
Gain=Imul/Iac
K=Gain/(VEAO-0.7V)
Imul = K x (VEAO – 0.7V) x IAC
Where K is in units of [V-1]
Note that the output current of the gain modulator is limited
around 140 μ A and the maximum output voltage of the gain
modulator is limited to 140uA x 5.7K=0.8V. This 0.8V also will
determine the maximum input power.
However, IGAINMOD cannot be measured directly from ISENSE.
ISENSE = IGAINMOD-IOFFSET and IOFFSET can only be measured
when VEAO is less than 0.5V and IGAINMOD is 0A. Typical
IOFFSET is around 25uA.
IAC=20uA, Veao=6V
Gain vs. VRMS (pin4)
When VRMS below 1V, the PFC is shut off. Designer needs
to design 80VAC with VRMS average voltage= 1.14V.
Gain = I SENSE − I OFFSET = I MUL
I AC I AC
Selecting RAC for IAC pin
IAC pin is the input of the gain modulator. IAC also is a
current mirror input and it requires current input. By selecting a
proper resistor RAC, it will provide a good sine wave current
derived from the line voltage and it also helps program the
maximum input power and minimum input line voltage.
RAC=Vin min peak x 50K. For example, if the minimum line
voltage is 85VAC, the RAC=85 x 1.414 x 50K = 6.0 Mega ohm.
2011/06/01 Rev. 1.0
Champion Microelectronic Corporation
11
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