CM6802 Champion Microelectronic, CM6802 Datasheet

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CM6802

Manufacturer Part Number
CM6802
Description
NO BLEED RESISTOR GREEN MODE PFC/PWM CONTROLLER COMBO
Manufacturer
Champion Microelectronic
Datasheet

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GENERAL DESCRIPTION
The CM6802 is a green PFC/PWM. It is the new generation
of ML4802, ML4841, ML4801 and ML4824-2. Its system
clock frequency is generated by the external RT and CT,
and then its PWM frequency is 50% of the clock and its
PFC frequency is 25% of the clock. CM6802 is designed to
be pin-pin compatible with CM6800 family, ML4800 family
and ML4824 family. Its PWM (DC to DC section) can be
easily configured to Voltage Mode or Current Mode. The
green mode function can easily be designed so during the
no load condition, its input power can be less than 0.75Watt
without shutting off PFC. Its PFC green mode threshold and
the PWM green mode threshold can separately set by
selecting the proper the RC filter at ISENSE pin (pin3) and
CT on RAMP 1 pin (pin 7). 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 CM6800, CM6802 includes
circuits for the implementation of leading edge, average
current, “boost” type power factor correction and a trailing
edge, pulse width modulator (PWM). Both PFC and PWM
Gate-driver with 0.5A 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.
When RAMP1 is 280KHz, fpfc is 70KHz and fpwm is
140KHz.
2003/06/25
Preliminary
N
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LEED
R
ESISTOR
Champion Microelectronic Corporation
G
FEATURES
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24 Hours Technical Support---WebSIM
Champion provides customers an online circuit simulation tool
called WebSIM. You could simply logon our website at
www.champion-micro.com for details.
REEN
Patent Number #5,565,761, #5,747,977, #5,742,151,
#5,804,950, #5,798,635
fosc=2 x fpwm =4 x fpfc
No bleed resistor required
Before the chip wakes up, IAC can start up VCC
Pin to pin Compatible with CM6800, ML4824 and ML4800
(It needs to modify the values of the external component to
work properly).
User Program PFC automatic green mode threshold
(patented)
User Program PWM automatic green mode threshold
(patented)
Input power less than 0.75Watt without shutting off PFC at
no load condition.
Additional folded-back current limit for PWM section.
23V Bi-CMOS process
PWM pulse keeping for the green mode
VIN OK guaranteed 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 (30µA 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 will turn off both PFC and PWM
Low Power Detect Comparator
Tri-Fault detect to meet UL1950
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
M
ODE
PFC/PWM C
ONTROLLER
CM6802
Page 1
C
OMBO

Related parts for CM6802

CM6802 Summary of contents

Page 1

... N O GENERAL DESCRIPTION The CM6802 is a green PFC/PWM the new generation of ML4802, ML4841, ML4801 and ML4824-2. Its system clock frequency is generated by the external RT and CT, and then its PWM frequency is 50% of the clock and its PFC frequency is 25% of the clock. CM6802 is designed to be pin-pin compatible with CM6800 family, ML4800 family and ML4824 family ...

Page 2

... DC I PWM current limit comparator input LIMIT 10 GND Ground Preliminary 2003/06/ LEED ESISTOR REEN PIN CONFIGURATION Description Champion Microelectronic Corporation CM6802 PFC/PWM C ODE ONTROLLER SOP-16 (S16) / PDIP-16 (P16) Top View IEA REF I SENSE ...

Page 3

... REFERENCE . - PFC ILIMIT R Q PWM DUTY 1. ILIMIT Q S VCC UVLO R fosc=2xfpwm=4xfpfc CM6802 C OMBO VCC V VCC VREF 14 POWER FACTOR CORRECTOR VCC MPPFC PFC OUT 12 MNPFC GND CLK PFCOUT PWMOUT VCC MPPWM PWM OUT ...

Page 4

... ODE ONTROLLER Package 16-Pin PDIP (P16) 16-Pin SOP (S16) Min. Max 4.5 -5 0.7 GND – 0.3 VCC + 0.3 GND – 0.3 VCC + 0.3 GND – 0.3 VREF + 0 1.5 150 -65 150 -40 125 260 80 105 CM6802 Min. Typ 2.45 2.5 -1.0 -0.5 5.8 6.0 0.1 - -1.5 50 100 -12 C OMBO Units ...

Page 5

... ODE ONTROLLER CM6802 Min. Typ. -1.0 -0.5 4.0 4.25 0.65 - < 16. 2.70 2.77 230 0.4 0.5 0.25 19 19.4 1.40 1.5 -1.10 -1.00 80 200 250 0.95 1.0 250 2.35 2.45 0 0.70 0. < 16. CM6802 C OMBO Unit Max. µA V 1.0 V -35 µA µ 2.85 V 290 mV 0 1.65 V -0. 1. 2.55 V 1.2 V 0.81 2.03 0.92 0.29 MHz 0.90 V 75.5 kHz % % Page 5 ...

Page 6

... CM6802 Min. Typ. 68 2.5 500 = 2.5V 6 1mA 7.4 7 0℃~70℃ -40℃~85℃ 0.4 7. 0.8 0.4 30 13.5 14.2 50 0-49.5 15 0.8 0.7 30 13.5 14 14.7 15 4.85 5.0 ; VEAO = 6V MAX CM6802 C OMBO Unit Max. 84 kHz V 700 ns 10 22.5 ohm 1 ohm V ns 0-50 % 22.5 ohm 1 ohm µ ...

Page 7

... Champion Microelectronic Corporation M PFC/PWM C ODE ONTROLLER 220 200 180 160 140 120 100 -500 -400 -300 -200 -100 0 100 200 ISENSE (mV) ) Transconductance mi 2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0 0.5 1 1.5 2 2.5 3 3.5 VRMS (V) Gain I I SENSE OFFSET Gain I AC CM6802 C OMBO 300 400 500 4 4.5 5 Page 7 ...

Page 8

... The synchronized of the PWM with the PFC simplifies the PWM compensation due to the controlled ripple on the PFC output capacitor (the PWM input capacitor). The PWM section of the CM6802 runs at the same frequency as the PFC. In addition to power factor correction, a number of protection features have been built into the CM6802. These ...

Page 9

... PFC Section Gain Modulator Figure 1 shows a block diagram of the PFC section of the CM6802. The gain modulator is the heart of the PFC this circuit block which controls the response of the current loop to line voltage waveform and frequency, rms line voltage, and PFC output voltages. There are three inputs to the gain modulator ...

Page 10

... R 1.414)/(2 x 200) = 0.197 ohm. PFC OVP In the CM6802, PFC OVP comparator serves to protect the power circuit from being subjected to excessive voltages if the load should suddenly change. A resistor divider from the high voltage DC output of the PFC is fed to VFB. When the voltage on VFB exceeds 2 ...

Page 11

... The gain vs. input voltage of the CM6802’s voltage error amplifier, V specially shaped non-linearity such that under steady-state operating conditions the transconductance of the error amplifier local minimum. Rapid perturbation in line or ...

Page 12

... LIMIT protection. No voltage error amplifier is included in the PWM stage of the CM6802, as this function is generally performed on the output side of the PWM’s isolation boundary. To facilitate the design of optocoupler feedback circuitry, an offset has been built into the PWM’s RAMP2 input which allows V command a zero percent duty cycle for input voltages below 1 ...

Page 13

... LEED ESISTOR REEN Generating V After turning on CM6802 at 15V, the operating voltage can vary from 10V to 19.4V. The threshold voltage of VCC OVP comparator is 19.4V. The hysteresis of VCC OVP is 1.5V. When VCC see 19.4V, PFCOUT will be low, and PWM section will not be disturbed. That’s the two ways to generate VCC ...

Page 14

... N O EXAMPLE: With a wanting voltage called, V and the CM6802 driving a total gate charge of 90nC at 100kHz (e.g. 1 IRF840 MOSFET and 2 IRF820 MOSFET), the gate driver current required is 100kHz x 90nC = 9mA GATEDRIVE V V BIAS BIAS 18V 15V www.DataSheet4U.com R = BIAS 5mA ...

Page 15

... R1B R2B R3 R4 D12 D13 Champion Microelectronic Corporation PFC/PWM C ODE ONTROLLER R25 R26 C23 U3 C10 C9 C8 R11 C17 C14 C13 D15 C17 C16 C15 D10 R10 R6 C31 R8 C18 VDC C19 R28 C2 D14 C3 C32 R5D R5C R5B R5A CM6802 C OMBO C11 D8 Page 15 ...

Page 16

... Q1 R26 Q2N2222 18k MUR1100 22 1N4148 Q2 C23 R23 R24 470p Q2N904 75 22 R25 10k VFB C55A C41 R58 C43 IEAO U2 CM6802 1 16 VEAO IEAO VEAO 2 15 IAC VFB VREF 3 14 VREF I-SENSE VREF 4 13 VCC C54 VCC VRMS VCC C52 C53 ...

Page 17

... N O PACKAGE DIMENSION PIN 1 ID www.DataSheet4U.com PIN 1 ID Preliminary 2003/06/ LEED ESISTOR REEN 16-PIN PDIP (P16) 16-PIN SOP (S16) Champion Microelectronic Corporation CM6802 PFC/PWM C ODE ONTROLLER C OMBO Page 17 ...

Page 18

... Preliminary 2003/06/ LEED ESISTOR REEN IMPORTANT NOTICE Sales & Marketing 11F, No. 306-3, Sec Tung Rd., Hsichih, Taipei Hsien 221 Taiwan, R.O. +886-2-8692 1591 +886-2-8692 1596 Champion Microelectronic Corporation CM6802 PFC/PWM C ODE ONTROLLER C OMBO Page 18 ...

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