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PDF CM6900IS Data sheet ( Hoja de datos )
| Número de pieza | CM6900IS | |
| Descripción | PFC/PWM COMBO w/ INRUSH CURRENT CONTROL & SEPARATED PFCOVP | |
| Fabricantes | ETC | |
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CM6900
PFC/PWM COMBO w/ INRUSH CURRENT CONTROL & SEPARATED PFCOVP
ORDERING INFORMATION
Part Number
CM6900IP
CM6900IS
Temperature Range
-40℃ to 125℃
-40℃ to 125℃
Package
20-Pin PDIP (P20)
20-Pin Wide SOP (S20)
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are those values beyond which the device could be permanently damaged.
Parameter
VCCA and PVDD
IEAO
ISENSE Voltage
PFC OUT
PWMOUT
INRUSHSTOPB
Voltage on Any Other Pin
IREF
IAC Input Current
Peak PFC OUT Current, Source or Sink
Peak PWM OUT Current, Source or Sink
PFC OUT, PWM OUT Energy Per Cycle
Junction Temperature
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering, 10 sec)
Thermal Resistance (θJA)
Plastic DIP
Plastic SOIC
Min.
0
-5
GND – 0.3
GND – 0.3
GND – 0.3
GND – 0.3
-65
-40
Max.
23
4.5
0.7
VCCA + 0.3
VCCA + 0.3
VCCA + 0.3
VREF + 0.3
10
1
1
1
1.5
150
150
125
260
80
105
Units
V
V
V
V
V
V
V
mA
mA
A
A
µJ
℃
℃
℃
℃
℃/W
℃/W
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply VCCA=+15V,
RT = 52.3kΩ, CT = 470pF, TA=Operating Temperature Range (Note 1)
Symbol
Parameter
Input Voltage Range
Transconductance
Feedback Reference Voltage
Input Bias Current
Output High Voltage
Output Low Voltage
Sink Current
Source Current
Open Loop Gain
Power Supply Rejection Ratio
Test Conditions
Voltage Error Amplifier (gmv)
VNONINV = VINV, VEAO = 3.75V
Note 2
VFB = 3V, VEAO = 6V
VFB = 1.5V, VEAO = 1.5V
11V < VCCA < 16.5V
Min.
CM6900
Typ.
Max.
Unit
0 5V
30 65 90 µmho
2.45 2.5 2.55
V
-1.0 -0.5
µA
5.8 6.0
V
0.1 0.4
V
-35 -20 µA
30 40
µA
50 60
dB
50 60
dB
2003/04/23 Preliminary Rev. 1.2
Champion Microelectronic Corporation
Page 4
5 Page 
CM6900
PFC/PWM COMBO w/ INRUSH CURRENT CONTROL & SEPARATED PFCOVP
Figure 1. PFC Section Block Diagram
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
creates a differentiated 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 CM6900’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
2003/04/23 Preliminary Rev. 1.2
Champion Microelectronic Corporation
Page 10
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet CM6900IS.PDF ] | |
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