GENERAL DESCRIPTION FEATURES
CM6502THH is designed to meet 90+ spec. (total efficiency). It has the following key features.
1.) 420V bulk capacitor value can be reduced, and also
PFC Boost Capacitor ripple current can be reduced
2.) Turbo Speed PFC may reduce 420 Bulk Capacitor
size further
3.)    A PGB function is designed for interfacing to next
stage controller or the House Keeping IC at
secondary side.  It has a customer programmable
low threshold PGTHL
4.) “Remember it was Light Load” function and
“Remember it was Full Load” function may reduce
PFC 420V Bulk Capacitor size further. It boosts the
total efficiency as well.
5.) No Load Consumption can be reduced to 290mW at
270VAC
6.) Better Power Factor and Better THD
7.) Clean Digital PFC Brown Out
8.) The stress over the entire external power device is
reduced and EMI noise reduced
9.) Superior Surge Noise Immunity
CM6502THH is designed to meet the EPA/90+ regulation. With the proper design, its efficiency of power supply can easily approach 90+.  Patents Pending
23V Bi-CMOS process.
Designed for EPA/90+efficiency
Selectable Boost output from 380V to 355V during light load
Customer Programmable the Low Threshold of PGB comparator at PGTHL pin
“Remember It was Light Load” function to improve the efficiency
“Remember It was Light Load” function to have extra hold-up time @ light load
Clean Digital PFC Brown Out
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 (50uA typ.)
Low operating current (2.1mA typ.)
Adjustable Long Delay Time for Line Sagging
(Up to 2 Second)
16.5V VCC shunt regulator
Dynamic Soft PFC to ease the stress of the Power Device and Ease the EMI-filter design.
Better Power Factor and Better THD
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.
Precision Current Limit, over-voltage protection, UVLO, and soft start, and Reference OK.
APPLICATIONS PIN CONFIGURATION
EPA/90+ related Power Supply  Desktop PC Power Supply  Internet Server Power Supply  LCD Power Supply  PDP Power Supply  AC Adaptor  IPC Power Supply  UPS
Battery Charger  DC Motor Power Supply  Monitor Power Supply
Telecom System Power Supply                Distributed Power
DIP-14 (P14) / SOP-14 (S14)
TOP View
9PGTHL 13IEAO ISS VREF VFB VEAO 128
10PFCOUT
11VCC RTCT
ISENSE 2167
4VRMS 3PGB GND
5IAC 14PIN DESCRIPTION
Operating Voltage Pin No.
Symbol
Description
Min. Typ. Max.Unit 1 I EAO
PFC transconductance current error amplifier output (Gmi).
0  VREF
V
2 I AC  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.
0  100 uA
3 I SENSE  PFC Current Sense: for both Gain Modulator and PFC ILIMIT comparator.
-1.3  0.7 V 4
V RMS
Line Input Sense pin for multiplier and also it is the PFC Brown out sense pin.
0  6 V
5 ISS
PFC Soft Start pin: It supplies ~ 10uA to SS pin. It provides a close-loop soft start function during power supply start up. When VFB is lower than PGTHL, PGB
comparator, SS pin is discharged through an internal ~ 145.3K Ohm resistor.
PFC Soft Start function can just need a simple capacitor
0  VCC V
6 PGTHL PGTHL is an input I/O. The user can program the Low
Threshold of the Power Good which can determine the
comparator output of PGB (open drain) to be pulled high.
0  2.25 V
7 RTCT Oscillator timing node; timing set by RT and CT 0.8    4 V 8 GND Ground
9 PGB PGB is the PG comparator output. The input of PG comparator is using Vfb (pin 13) to compare with the high threshold, 2.25V (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.
0  6 V
10 PFC OUT PFC driver output 0  VCC V 11 V CC
Positive supply for CM6502THH
10 15 18 V
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)pending
0  6 V
Simplified Block Diagram (CM6502THH)
ORDERING INFORMATION
Part Number Temperature Range Package
CM6502THHXIS* -40℃ to 125℃14-Pin Narrow SOP (S14)
CM6502THHXISTR* -40℃ to 125℃14-Pin Narrow SOP (S14)
CM6502THHXIP* -40℃ to 125℃14-Pin Narrow DIP (P14)
*Note: X : Suffix for Halogen Free and PB Free Product
TR : Package is Typing Reel
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are those values beyond which the device could be permanently damaged.
Parameter Min.
Max.
Units
V CC18
V IEAO 0
VREF+0.3
V I SENSE Voltage -5 0.7 V
PFC OUT GND – 0.3 VCC + 0.3 V
I REF    3.5
mA
I AC Input Current    1 mA
Peak PFC OUT Current, Source or Sink 0.5    A
PFC OUT, Energy Per Cycle    1.5 μJ
Junction Temperature 150 ℃
Storage Temperature Range -65 150 ℃
Operating Temperature Range -40 125 ℃
Lead Temperature (Soldering, 10 sec) 260 ℃
Thermal Resistance (θJA)
Plastic DIP Plastic SOIC 80
105
℃/W
℃/W

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