CM6502S
(Dynamic Soft 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
CM6502S is a ZVS-Like Single PFC and it is designed to
meet 90+ spec. ( total efficiciency). 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 ripple current can be reduced; therefore,
the boost inductor core size may be reduced.
3.)
No Load Consumption can be reduced to 290mW at
270VAC.
4.)
The stress over the entire external power device is
reduced and EMI noise reduced.
5.)
A PGB function is designed for interfacing to next
stage controller. It has a customer programmable
low threshold PGTHL.
CM6502S is designed to meet the EPA/80+ 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 342V during light
load.
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 (55uA typ.)
Low operating current (2.5mA typ.)
16.5V VCC shunt regulator
Customer Programmable Low Threshold PGTHL
Dynamic Soft PFC to ease the stress of the Power
Device and Ease the EMI-filter design.
PFC Digital Brown Out
Low total harmonic distortion, THD and Power Factor
approaches 1.0.
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.
Brown-out control, over-voltage protection, UVLO, and
soft start, and Reference OK.
Power Fold Back Protection
2008/10/09
Rev. 1.0
Champion Microelectronic Corporation
1
CM6502S
(Dynamic Soft 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
APPLICATIONS
EPA/90+ related Power Supply
Desktop PC Power Supply
Internet Server Power Supply
LCD Power Supply
PDP Power Supply
IPC Power Supply
UPS
Battery Charger
DC Motor Power Supply
Monitor Power Supply
Telecom System Power Supply
Distributed Power
PIN CONFIGURATION
DIP-14 (P14) / SOP-14 (S14)
TOP View
1
2
3
4
5
6
7
IEAO
IAC
ISENSE
VRMS
ISS
PGTHL
RTCT
VEAO
VFB
VREF
VCC
PFCOUT
PGB
GND
14
13
12
11
10
9
8
PIN DESCRIPTION
Pin No.
Symbol
Description
PFC transconductance current error amplifier output
(Gmi).
IAC has 2 functions:
1. PFC gain modulator reference input.
2. At start up, IAC is connected to VCC and it helps to
reduce the startup time and it helps to reduce the no load
consumption. Typical RAC resistor is about 6 Mega ohm
to 8 Mega ohm to sense the line.
Operating Voltage
Min.
0
Typ.
Max.
VREF
Unit
V
1
I
EAO
2
I
AC
0
100
uA
3
4
I
SENSE
V
RMS
PFC Current Sense: for both Gain Modulator and PFC
ILIMIT comparator.
Line Input Sense pin for multiplier and also it is the PFC
Brown out sense pin.
PFC Soft Start pin: It supplies ~ 10uA to SS pin. It
provides a close-loop soft start function during power
supply start up. During PFC Brown Out, SS pin is
charged through an internal ~ 300 Ohm resistor.
PFC Soft Start function can just need a simple capacitor
to ground and it can be around 1uF.
-1.2
0
0.7
6
V
V
5
ISS
0
10
V
2008/10/09
Rev. 1.0
Champion Microelectronic Corporation
2
CM6502S
(Dynamic Soft 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
PGTHL is an input I/O. The user can program the Low
6
PGTHL
Threshold of the Power Good which can determine the
comparator output of PGB(open drain) to be pulled high.
0
2.3
V
7
8
RTCT
Oscillator timing node; timing set by RT and CT
0.8
4
V
GND
Ground
PGB is the PG comparator output. The input of PG
comparator is using Vfb (pin 13) to compare with the high
threshold, 2.3V (preset internally) and the low threshold,
PGTHL (pin 6, Set by user).
When 380V is ready, pin 9 is open-drain and it will be
pulled low.
9
PGB
0
6
V
10
11
PFC OUT
V
CC
PFC driver output
0
10
15
VCC
V
18
V
Positive supply for CM6502S
12
VREF
Maximum 3.5mA buffered output for the internal 7.5V
reference when VCC=14V
7.5
V
13
V
FB
PFC transconductance voltage error amplifier input
0
2.5
3
V
14
VEAO
PFC transconductance voltage error amplifier output
(GmV)
0
6
V
2008/10/09
Rev. 1.0
Champion Microelectronic Corporation
3
CM6502S
(Dynamic Soft 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
Simplified Block Diagram (CM6502S)
14
2.5V
VFB
13
2
4
3
IAC
VRMS
ISENSE
Gain Modulator
Imul
Dynamic Soft
VEAO
1
IEAO
VFB
+
-
-
12
PFC OVP
.
VREF
VCC
11
16.5V
Shunt
+
GMv
.
Rmul
+
-
-
GMi
.
2.75V
2.5V
PFC CMP
+
-
VRMS
+
-
-
VINOK
.
7.5V
REFERENCE
IAC
Rmul
PFC RAMP
PFC
7 RAMP1
RTCT
RTCT
.
1.25V
1.0V
PFC Tri-Fault
+
0.5V
-
VFB
PFC ILIMIT
+
-1.0V
-
ISENSE
Green PFC
+
0.3V
-
VEAO
PFCCLK=0.25 RTCT Frequency
S
Q
VCC
R
Q
50 Ohm ON
PFC OUT
10
30 Ohm OFF
17V
ZENER
S
Q
R
Q
RTCT CLK
VFB
6
PGTHL
VREF+2.5V
2.3V
+
PG
.
-
PGB
9
30 Ohm OFF
17V
ZENER
10uA
SUPPORT
5
SS
VCC
10V
REFOKB
300Ohm
VINOKB
300 Ohm
13V
UVLO
.
GND
8
ORDERING INFORMATION
Part Number
CM6502SXIS*
CM6502SXIP*
*Note:
X : Suffix for Halogen Free Product
Temperature Range
-40℃ to 125℃
-40℃ to 125℃
Package
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
V
CC
IEAO
I
SENSE
Voltage
PFC OUT
I
REF
I
AC
Input Current
Peak PFC OUT Current, Source or Sink
PFC OUT, Energy Per Cycle
Junction Temperature
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering, 10 sec)
Thermal Resistance (θ
JA
)
Plastic DIP
Plastic SOIC
Min.
0
-5
GND – 0.3
Max.
18
VREF+0.3
0.7
VCC + 0.3
5
1
0.5
1.5
150
150
125
260
80
105
Units
V
V
V
V
mA
mA
A
μ
J
℃
℃
℃
℃
℃/W
℃/W
-65
-40
2008/10/09
Rev. 1.0
Champion Microelectronic Corporation
4
CM6502S
(Dynamic Soft 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
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications apply Vcc=+14V, R
T
= 7.75K kΩ, C
T
= 1000pF, T
A
=Operating Temperature
Range (Note 1)
Symbol
Parameter
Test Conditions
Min.
CM6502S
Typ.
Max.
Unit
PFC Brown Out
VRMS Threshold High
VRMS Threshold Low
Hysteresis
AC High Light
AC Low Light
Hysteresis
Voltage Error Amplifier (g
mv
)
Input Voltage Range
Transconductance
Feedback
(High)
Input Bias Current
Output High Voltage
Output Low Voltage
Sink Current
Source Current
Open Loop Gain
Power Supply Rejection Ratio
Current Error Amplifier (g
mi
)
Input Voltage Range (Isense pin)
Transconductance
Input Offset Voltage
Output High Voltage
Output Low Voltage
V
NONINV
= V
INV
, IEAO = 3.75V @ T=25℃
VEAO=0V, IAC is open
-1.2
50
-10
6.8
7.4
0.1
65
0.7
80
50
7.7
0.4
V
V
FB
= 3V, VEAO = 6V
V
FB
= 1.5V, VEAO = 1.5V
DC gain
11V < V
CC
< 16.5V
TBD
30
60
Note 2
Reference
V
NONINV
= V
INV
, VEAO = 3.75V @ T=25℃
Voltage Veao = 1.5V
VRMS>2.25V
0
38
2.32
-1.0
5.8
48
2.39
-0.05
6.0
0.1
6.7
70
40
75
TBD
0.4
3
58
2.44
V
Sweep Vrms Pin
Sweep Vrms Pin
Room Temperature=25℃
Room Temperature=25℃
1.19
0.97
170
2.13
1.66
0.68
1.25
1.05
216
2.25
1.32
1.13
260
2.36
1.82
0.86
V
V
mV
V
V
V
μ
mho
V
μ
A
V
V
μ
A
μ
A
dB
dB
μ
mho
mV
V
V
2008/10/09
Rev. 1.0
Champion Microelectronic Corporation
5
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