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PDF CM6802 Data sheet ( Hoja de datos )
| Número de pieza | CM6802 | |
| Descripción | NO BLEED RESISTOR GREEN MODE PFC/PWM CONTROLLER COMBO | |
| Fabricantes | Champion Microelectronic | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CM6802 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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CM6802
NO BLEED RESISTOR GREEN MODE PFC/PWM CONTROLLER COMBO
GENERAL DESCRIPTION
FEATURES
The CM6802 is a green PFC/PWM. It is the new generation
of ML4802, ML4841, ML4801 and ML4824-2. Its system
clock frequency is generated by the external RT and CT,
and then its PWM frequency is 50% of the clock and its
PFC frequency is 25% of the clock. CM6802 is designed to
be pin-pin compatible with CM6800 family, ML4800 family
and ML4824 family. Its PWM (DC to DC section) can be
easily configured to Voltage Mode or Current Mode. The
www.DataSghreeeetn4Um.coodme function can easily be designed so during the
no load condition, its input power can be less than 0.75Watt
without shutting off PFC. Its PFC green mode threshold and
the PWM green mode threshold can separately set by
selecting the proper the RC filter at ISENSE pin (pin3) and
CT on RAMP 1 pin (pin 7). Power Factor Correction (PFC)
allows the use of smaller, lower cost bulk capacitors,
reduces power line loading and stress on the switching
FETs, and results in a power supply that fully compiles with
IEC-1000-3-2 specifications. Intended as a BiCMOS
version of the industry-standard CM6800, CM6802 includes
circuits for the implementation of leading edge, average
current, “boost” type power factor correction and a trailing
edge, pulse width modulator (PWM). Both PFC and PWM
Gate-driver with 0.5A capabilities minimizes the need for
external driver circuits. Low power requirements improve
efficiency and reduce component costs.
An over-voltage comparator shuts down the PFC section in
the event of a sudden decrease in load. The PFC section
also includes peak current limiting and input voltage
brownout protection. The PWM section can be operated in
current or voltage mode, at up to 250kHz, and includes an
accurate 50% duty cycle limit to prevent transformer
saturation.
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When RAMP1 is 280KHz, fpfc is 70KHz and fpwm is
140KHz.
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Patent Number #5,565,761, #5,747,977, #5,742,151,
#5,804,950, #5,798,635
fosc=2 x fpwm =4 x fpfc
No bleed resistor required
Before the chip wakes up, IAC can start up VCC
Pin to pin Compatible with CM6800, ML4824 and ML4800
(It needs to modify the values of the external component to
work properly).
User Program PFC automatic green mode threshold
(patented)
User Program PWM automatic green mode threshold
(patented)
Input power less than 0.75Watt without shutting off PFC at
no load condition.
Additional folded-back current limit for PWM section.
23V Bi-CMOS process
PWM pulse keeping for the green mode
VIN OK guaranteed turn on PWM at 2.5V instead of 1.5V
Internally synchronized leading edge PFC and trailing edge
PWM in one IC
Slew rate enhanced transconductance error amplifier for
ultra-fast PFC response
Low start-up current (30µA typ.)
Low operating current (3.0mA type.)
Low total harmonic distortion, high PF
Reduces ripple current in the storage capacitor between the
PFC and PWM sections
Average current, continuous or discontinuous boost leading
edge PFC
VCC OVP Comparator will turn off both PFC and PWM
Low Power Detect Comparator
Tri-Fault detect to meet UL1950
PWM configurable for current mode or voltage mode
operation
Current fed gain modulator for improved noise immunity
Brown-out control, over-voltage protection, UVLO, and soft
start, and Reference OK
24 Hours Technical Support---WebSIM
Champion provides customers an online circuit simulation tool
called WebSIM. You could simply logon our website at
www.champion-micro.com for details.
2003/06/25 Preliminary
Champion Microelectronic Corporation
Page 1
1 page  
CM6802
NO BLEED RESISTOR GREEN MODE PFC/PWM CONTROLLER COMBO
ELECTRICAL CHARACTERISTICS (Conti.) Unless otherwise stated, these specifications apply
Vcc=+15V, RT = 5.0kΩ, CT = 1.0nF, TA=Operating Temperature Range (Note 1)
Symbol
Parameter
Test Conditions
Input Bias Current
Output High Voltage
Output Low Voltage
Sink Current
Source Current
www.DataSheet4U.com Open Loop Gain
Power Supply Rejection Ratio
Threshold Voltage
Hysteresis
Threshold Voltage
Hystersis
Threshold Voltage
Hysteresis
Threshold Voltage
(PFC ILIMIT VTH – Gain Modulator
Output)
Delay to Output (Note 4)
Threshold Voltage
Delay to Output (Note 4)
Threshold Voltage
Hysteresis
Gain (Note 3)
Bandwidth
Output Voltage =
3.5K*(ISENSE-IOFFSET)
PFC Initial Accuracy
Voltage Stability
Temperature Stability
ISENSE = +0.5V, IEAO = 4.0V
ISENSE = -0.5V, IEAO = 1.5V
11V < VCC < 16.5V
PFC OVP Comparator
Low Power Detect Comparator
VCC OVP Comparator
PFC ILIMIT Comparator
Overdrive Voltage = -100mV
DC ILIMIT Comparator
Overdrive Voltage = 100mV
VIN OK Comparator
GAIN Modulator
IAC = 100µA, VRMS = VFB = 1V
IAC = 100µA, VRMS = 1.1V, VFB = 1V
IAC = 150µA, VRMS = 1.8V, VFB = 1V
IAC = 300µA, VRMS = 3.3V, VFB = 1V
IAC = 100µA
IAC = 250µA, VRMS = 1.1V, VFB = 1V
Oscillator
TA = 25℃
11V < VCC < 16.5V
Min.
-1.0
4.0
35
60
60
CM6802
Typ.
-0.5
4.25
0.65
-65
75
70
75
Max.
1.0
-35
2.70 2.77 2.85
230 290
0.4 0.5 0.6
0.25
19 19.4 20
1.40 1.5 1.65
-1.10
80
-1.00
200
250
-0.90
0.95 1.0 1.05
250
2.35 2.45 2.55
0.8 1.0 1.2
0.59
0.81
1.47 2.03
0.66 0.92
0.21 0.29
10
0.70 0.80 0.90
66 75.5
1
2
Unit
µA
V
V
µA
µA
dB
dB
V
mV
V
V
V
V
V
mV
ns
V
ns
V
V
MHz
V
kHz
%
%
2003/06/25 Preliminary
Champion Microelectronic Corporation
Page 5
5 Page 
CM6802
NO BLEED RESISTOR GREEN MODE PFC/PWM CONTROLLER COMBO
Error Amplifier Compensation
The PWM loading of the PFC can be modeled as a
negative resistor; an increase in input voltage to the PWM
causes a decrease in the input current. This response
dictates the proper compensation of the two
transconductance error amplifiers. Figure 2 shows the types
of compensation networks most commonly used for the
voltage and current error amplifiers, along with their
respective return points. The current loop compensation is
returned to VREF to produce a soft-start characteristic on the
PFC: as the reference voltage comes up from zero volts, it
www.DataSchreeeatt4eUs.caomdifferentiated voltage on IEAO which prevents the
PFC from immediately demanding a full duty cycle on its
boost converter.
PFC Voltage Loop
There are two major concerns when compensating the
voltage loop error amplifier, VEAO; stability and transient
response. Optimizing interaction between transient
response and stability requires that the error amplifier’s
open-loop crossover frequency should be 1/2 that of the
line frequency, or 23Hz for a 47Hz line (lowest anticipated
international power frequency). The gain vs. input voltage
of the CM6802’s voltage error amplifier, VEAO has a
specially shaped non-linearity such that under steady-state
operating conditions the transconductance of the error
amplifier is at a local minimum. Rapid perturbation in line or
load conditions will cause the input to the voltage error
amplifier (VFB) to deviate from its 2.5V (nominal) value. If
this happens, the transconductance of the voltage error
amplifier will increase significantly, as shown in the Typical
Performance Characteristics. This raises the
gain-bandwidth product of the voltage loop, resulting in a
much more rapid voltage loop response to such
perturbations than would occur with a conventional linear
gain characteristics.
The Voltage Loop Gain (S)
= ∆VOUT * ∆VFB * ∆VEAO
∆VEAO ∆VOUT ∆VFB
≈
PIN * 2.5V
V2
OUTDC
*
∆VEAO
*
S
*
CDC
* GMV * ZCV
ZCV: Compensation Net Work for the Voltage Loop
GMv: Transconductance of VEAO
PIN: Average PFC Input Power
VOUTDC: PFC Boost Output Voltage; typical designed value
is 380V.
CDC: PFC Boost Output Capacitor
PFC Current Loop
The current amplifier, IEAO compensation is similar to that of
the voltage error amplifier, VEAO with exception of the
choice of crossover frequency. The crossover frequency of
the current amplifier should be at least 10 times that of the
voltage amplifier, to prevent interaction with the voltage loop.
It should also be limited to less than 1/6th that of the
switching frequency, e.g. 16.7kHz for a 100kHz switching
frequency.
The Current Loop Gain (S)
= ∆VISENSE * ∆DOFF * ∆IEAO
∆DOFF ∆IEAO ∆ISENSE
≈ VOUTDC * RS * GMI * ZCI
S * L * 2.5V
ZCI: Compensation Net Work for the Current Loop
GMI: Transconductance of IEAO
VOUTDC: PFC Boost Output Voltage; typical designed value is
380V and we use the worst condition to calculate the ZCI
RS: The Sensing Resistor of the Boost Converter
2.5V: The Amplitude of the PFC Leading Modulation Ramp
L: The Boost Inductor
There is a modest degree of gain contouring applied to the
transfer characteristic of the current error amplifier, to
increase its speed of response to current-loop perturbations.
However, the boost inductor will usually be the dominant
factor in overall current loop response. Therefore, this
contouring is significantly less marked than that of the
voltage error amplifier. This is illustrated in the Typical
Performance Characteristics.
ISENSE Filter, the RC filter between RS and ISENSE :
There are 3 purposes to add a filter at ISENSE pin:
1.) Protection: During start up or inrush current
conditions, it will have a large voltage cross Rs
which is the sensing resistor of the PFC boost
converter. It requires the ISENSE Filter to attenuate
the energy.
2.) To reduce L, the Boost Inductor: The ISENSE Filter
also can reduce the Boost Inductor value since the
ISENSE Filter behaves like an integrator before going
ISENSE which is the input of the current error
amplifier, IEAO.
3.) By selecting the proper Rs, it can change the PFC
Green Mode threshold. Typical value is from 50
ohm (No Skipping) to 100 ohm.
The ISENSE Filter is a RC filter. The resistor value of the ISENSE
Filter is between 100 ohm and 50 ohm because IOFFSET x the
resistor can generate an offset voltage of IEAO. By selecting
RFILTER equal to 50 ohm will keep the offset of the IEAO less
than 5mV. Usually, we design the pole of ISENSE Filter at
fpfc/6, one sixth of the PFC switching frequency. Therefore,
the boost inductor can be reduced 6 times without disturbing
the stability. Therefore, the capacitor of the ISENSE Filter,
CFILTER, will be around 283nF.
2003/06/25 Preliminary
Champion Microelectronic Corporation
Page 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet CM6802.PDF ] | |
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