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PDF CM6800 Data sheet ( Hoja de datos )
| Número de pieza | CM6800 | |
| Descripción | LOW START UP CURRENT PFC/PWM CONTROLLER COMBO | |
| Fabricantes | Champion Microelectronic | |
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CM6800
LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO
GENERAL DESCRIPTION
FEATURES
The CM6800 is a controller for power factor corrected,
switched mode power suppliers. 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 ML4824,
CM6800 includes circuits for the implementation of leading
edge, average current, “boost” type power factor
correction and a trailing edge, pulse width modulator
(PWM). Gate-driver with 1A 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.
CM6800 includes an additional folded-back current limit
for PWM section to provide short circuit protection
function.
Patent Number #5,565,761, #5,747,977, #5,742,151,
#5,804,950, #5,798,635
Pin to pin compatible with ML4800 and FAN4800
Additional folded-back current limit for PWM section.
23V Bi-CMOS process
VIN OK 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 (100 μ A 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, Low Power Detect Comparator
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
APPLICATIONS
Desktop PC Power Supply
Internet Server Power Supply
IPC Power Supply
UPS
Battery Charger
DC Motor Power Supply
Monitor Power Supply
Telecom System Power Supply
Distributed Power
PIN CONFIGURATION
SOP-16 (S16) / PDIP-16 (P16)
Top View
1
IEAO
VEAO
16
2 IAC
VFB 15
3
ISENSE
VREF
14
4
VRMS
VCC
13
5
SS PFC OUT
12
6
VDC
PWM OUT
11
7
RAMP1
GND
10
8
RAMP2
DC ILIMIT
9
2008/10/23 Rev. 2.1
Champion Microelectronic Corporation
Page 1
1 page  
CM6800
LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO
ELECTRICAL CHARACTERISTICS (Conti.) Unless otherwise stated, these specifications apply
Vcc=+15V, RT = 30.16kΩ, CT =1000pF, TA=Operating Temperature Range (Note 1)
Symbol
Parameter
Test Conditions
Sink Current
Source Current
Open Loop Gain
Power Supply Rejection Ratio
Threshold Voltage
Hysteresis
Threshold Voltage
Threshold Voltage
Hysteresis
Fault Detect HIGH
Time to Fault Detect HIGH
Fault Detect LOW
Threshold Voltage
(PFC ILIMIT VTH – Gain Modulator
Output)
Delay to Output (Note 4)
Threshold Voltage
Delay to Output (Note 4)
OK Threshold Voltage
Hysteresis
Gain (Note 3)
Bandwidth
Output Voltage =
3.5K*(ISENSE-IOFFSET)
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
Tri-Fault Detect
VFB=VFAULT DETECT LOW to
VFB=OPEN.470pF from VFB to GND
PFC ILIMIT Comparator
Overdrive Voltage = -100mV
DC ILIMIT Comparator
Overdrive Voltage = 100mV
VIN OK Comparator
GAIN Modulator
IAC = 100 μ A, VRMS =0, VFB = 1V
at room temp
IAC = 100 μ A, VRMS = 1.1V, VFB = 1V
at room temp
IAC = 150 μ A, VRMS = 1.8V, VFB = 1V
at room temp
IAC = 300 μ A, VRMS = 3.3V, VFB = 1V
at room temp
IAC = 100 μ A
IAC = 250 μ A, VRMS = 1.1V, VFB = 1V
Min.
35
60
60
CM6800
Typ.
-65
75
70
75
Max.
-35
2.70 2.77 2.85
230 290
0.2 0.3 0.4
17.5 17.9 18.5
1.40 1.5 1.65
2.65 2.75 2.85
24
0.4 0.5 0.6
-1.10
20
-1.00
100
250
-0.90
0.95 1.0 1.05
250
2.35 2.45 2.55
0.95 1.2
1.4
0.70 0.84 0.95
1.80 2.00 2.20
0.90 1.00 1.10
0.25 0.32 0.40
10
0.84 0.90 0.95
Unit
μA
μA
dB
dB
V
mV
V
V
V
V
ms
V
V
mV
ns
V
ns
V
V
MHz
V
2008/10/23 Rev. 2.1
Champion Microelectronic Corporation
Page 5
5 Page 
CM6800
LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO
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 2 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.
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.
Figure 2. Compensation Network Connections for the
Voltage and Current Error Amplifiers
Figure 3. External Component Connections to VCC
2008/10/23 Rev. 2.1
Champion Microelectronic Corporation
Page 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet CM6800.PDF ] | |
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