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PDF CM6904 Data sheet ( Hoja de datos )
| Número de pieza | CM6904 | |
| Descripción | Low Pin Count PFC/PWM Controller Combo | |
| Fabricantes | Champion Microelectronic | |
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Hay una vista previa y un enlace de descarga de CM6904 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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GENERAL DESCRIPTION
CM6903/4
Low Pin Count PFC/PWM CONTROLLER COMBO
FEATURES
The CM6903/4 is a space-saving PFC-PWM controller for
power factor corrected, switched mode power supplies that
offers very low start-up and operating currents. For the
power supply less than 500Watt, its input current shaping
PFC performance could be very close to CM6800 or
ML4800 architecture.
Power Factor Correction (PFC) offers the use of smaller,
lower cost bulk capacitors, reduces power line loading and
stress on the switching FETs, and results in a power supply
fully compliant to IEC1000-3-2 specifications. The
CM6903/4 includes circuits for the implementation of a
leading edge, input current shaping technique “boost” type
PFC and a trailing edge, PWM.
The CM6903’s PFC and PWM operate at the same
frequency, 67kHz. The PFC frequency of the CM6904 is
automatically set at half that of the 134kHz PWM. This
higher frequency allows the user to design with smaller
PWM components while maintaining the optimum operating
frequency for the PFC. An PFC OVP comparator shuts
down the PFC section in the event of a sudden decrease in
load. The PFC section also includes peak current limiting
for enhanced system reliability.
Patent Number #5,565,761, #5,747,977, #5,742,151,
#5,804,950, #5,798,635
Pin to pin compatible with FAN6903/4
Enable lowest BOM for power supply with PFC
Internally synchronized PFC and PWM in one IC
Patented slew rate enhanced voltage error amplifier with
advanced input current shaping technique
Universal Line Input Voltage
CCM boost or DCM boost with leading edge modulation
PFC using Input Current Shaping Technique
Feedforward IAC pin to do the automatic slope
compensation
PFCOVP, PFC VCCOVP, Precision -1V PFC ILIMIT,
Tri-Fault Detect comparator to meet UL1950
No bleed resistor required
Low supply currents; start-up: 100uA typical, operating
current: 2mA typical.
Synchronized leading PFC and trailing edge modulation
PWM to reduce ripple current in the storage capacitor
between the PFC and PWM sections and to reduce
switching noise in the system
VINOK Comparator to guarantee to enable PWM when
PFC reach steady state
High efficiency trailing-edge current mode PWM
UVLO, REFOK, and brownout protection
Digital PWM softstart: CM6903 (10ms), CM6904 (5ms)
Precision PWM 1.5V current limit for current mode
operation
APPLICATIONS
Desktop PC Power Supply
AC Adaptor
Internet Server Power Supply
IPC Power Supply
UPS
Battery Charger
DC Motor Power Supply
Monitor Power Supply
Telecom System Power Supply
Distributed Power
2004/06/01 Preliminary Rev. 1.2
PIN CONFIGURATION
SIP-09 (Z09)
Front View
123456789
Champion Microelectronic Corporation
Page 1
1 page  
CM6903/4
Low Pin Count PFC/PWM CONTROLLER COMBO
ELECTRICAL CHARACTERISTICS (Conti.) Unless otherwise stated, these specifications apply
Vcc=+15V, RT = 52.3kΩ, CT = 470pF, TA=Operating Temperature Range (Note 1)
Symbol
Parameter
Test Conditions
CM6903/4
Min.
Typ.
PWM
Duty Cycle Range
CM6903
CM6904
0-49.5
0-49.5
Output Low Impedance
15
Output Low Voltage
Output High Impendence
IOUT = -100mA
IOUT = -10mA, VCC = 8V
0.8
0.7
30
Output High Voltage
Rise/Fall Time (Note 2)
IOUT = 100mA, VCC = 15V
CL = 1000pF
Supply
13.5 14.2
50
Start-Up Current
Operating Current
Undervoltage Lockout Threshold
VCC = 11V, CL = 0
VCC = 15V, CL = 0
100
2.5
14.7 15
Undervoltage Lockout Hysteresis
4.85 5
Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
Note 2: Guaranteed by design, not 100% production test.
Max.
0-50
0-50
22.5
1.5
1.5
45
150
4.0
15.3
5.15
Unit
%
%
ohm
V
V
ohm
V
ns
uA
mA
V
V
TYPICAL PERFORMANCE CHARACTERISTIC
127
120
113
106
99
92
85
78
71
64
57
2
2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9
VFB (V)
3
Voltage Error Amplifier (gmv) Transconductance
2004/06/01 Preliminary Rev. 1.2
Champion Microelectronic Corporation
Page 5
5 Page 
CM6903/4
Low Pin Count PFC/PWM CONTROLLER COMBO
UVLO
The UVLO threshold is 15V providing 5V hysteresis.
PFCOUT and PWMOUT
Both PFCOUT and PWMOUT are CMOS drivers. They both
have adaptive anti-shoot through to reduce the switching
loss. Its pull-up is a 30ohm PMOS driver and its pull-down
is a 15ohm NMOS driver. It can source 0.5A and sink 1A if
the VCC is above 15V.
PWM Section
After 10mS digital soft start, CM6903/4’s PWM is operating
as a typical current mode. It requires a secondary
feedback, typically, it is configured with CM431, and photo
couple.
Since PWM Section is different from CM6800 family, it
needs the emitter of the photo couple to connected with
DCILIMIT instead of the collector. The PWM current
information also goes into DCILIMIT. Usually, the PWM
current information requires a RC filter before goes into the
DCILIMIT.
Therefore, DCILIMIT actually is a summing node from
voltage information which is from photo couple and CM431
and current information which is from one end of PWM
sensing resistor and the signal goes through a single pole,
RC filter then enter the DCILIMIT pin.
This RC filter at DCILMIT also serves several functions:
1.) It protects IC.
2.) It provides level shift for voltage information.
3.) It filters the switching noise from current information.
The pole location of the RC filter should be greater than one
sixth of the PWM switching frequency which is 67Khz for
CM6903 and which is 134Khz for CM6904. Since the typical
photo couple should be biased around 1mA, the resistor of
the RC filter should be around 1.5V/1mA~1.5K ohm and we
suggest R is 1K ohm. Therefore, for CM6903, C should be
around 14nF and for CM6904, C should be around 1.2nF.
The maximum input voltage of the DCILIMIT pin is 1.5V.
Component Reduction
Components associated with the VRMS and IEAO pins of a
typical PFC controller such as the CM6800 have been
eliminated. The PFC power limit and bandwidth does vary
with line voltage. Double the power can be delivered from a
220V AC line versus a 110V AC line. Since this is a
combination PFC/PWM, the power to the load is limited by
the PWM stage.
2004/06/01 Preliminary Rev. 1.2
Champion Microelectronic Corporation
Page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CM6904.PDF ] | |
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