CM6824IS Champion Microelectronic Corp., CM6824IS Datasheet

CM6824IS

Manufacturer Part Number

CM6824IS

Description

Low Start-Up Current PFC/PWM Controller Combo

Manufacturer

Champion Microelectronic Corp.

Datasheet

1.CM6824IS.pdf (18 pages)

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GENERAL DESCRIPTION

The CM6824 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, CM6824 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.

APPLICATIONS

2002/09/20

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

Preliminary

Rev. 1.1

Champion Microelectronic Corporation

TART-

FEATURES

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.

PIN CONFIGURATION

Patent Filed #5,565,761, #5,747,977, #5,742,151,

#5,804,950, #5,798,635

Pin to pin compatible with ML4800 and FAN6800/1

Additional folded-back current limit for PWM section.

23V Bi-CMOS process

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 (100µA 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

URRENT

SOP-16 (S16) / PDIP-16 (P16)

PFC/PWM C

IEAO

RAMP1

RAMP2

SENSE

R M S

D C

Top View

PW M OUT

PFC OUT

DC I

VEAO

GND

ONTROLLER

LIM IT

R EF

C C

CM6824

Page 1

OMBO

Related parts for CM6824IS

CM6824IS Summary of contents

Page 1

GENERAL DESCRIPTION The CM6824 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 ...

Page 2

PIN DESCRIPTION Pin No. Symbol 1 IEAO PFC transconductance current error amplifier output 2 I PFC gain control reference input Current sense input to the PFC current limit comparator SENSE 4 V Input for PFC RMS line ...

Page 3

... ISENSE 3 RAMP1 7 350 RAMP2 8 SW SPST PWM CMP - 1.5V + VDC 6 Vcc 20uA 350 SPST SW SPST SW SPST VREF DC ILIMIT 9 ORDERING INFORMATION Part Number CM6824IP CM6824IS Preliminary 2002/09/20 Rev. 1 TART- P URRENT 1 IEAO VCC OVP VCC + 19.4V - 2.75V GMi PFC CMP + . + - - -1V 3.5K OSCILLATOR DUTY CYCLE ...

Page 4

ABSOLUTE MAXIMUM RATINGS Absolute Maximum ratings are those values beyond which the device could be permanently damaged. Parameter V CC IEAO I Voltage SENSE PFC OUT PWMOUT Voltage on Any Other Pin I REF I Input Current AC Peak PFC ...

Page 5

ELECTRICAL CHARACTERISTICS Vcc=+15V 52.3kΩ 470pF Symbol Parameter Sink Current Source Current Open Loop Gain Power Supply Rejection Ratio Threshold Voltage Hysteresis Threshold Voltage Threshold Voltage Hysteresis Threshold Voltage (PFC I V – Gain ...

Page 6

ELECTRICAL CHARACTERISTICS Vcc=+15V 52.3kΩ 470pF Symbol Parameter Output Voltage Line Regulation Load Regulation Temperature Stability Total Variation Long Term Stability Minimum Duty Cycle Maximum Duty Cycle Output Low Rdson Output High Rdson Rise/Fall ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTIC 127 120 113 106 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 VFB (V) Voltage Error Amplifier (g mv 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 ...

Page 8

Functional Description The CM6824 consists of an average current controlled, continuous boost Power Factor Correction (PFC) front end and a synchronized Pulse Width Modulator (PWM) back end. The PWM can be used in either current or voltage mode. In voltage ...

Page 9

The output of the gain modulator is a current signal, in the form of a full wave rectified sinusoid at twice the line frequency. This current is applied to the virtual-ground (negative) input of the current error amplifier. In this ...

Page 10

Error Amplifier Compensation The PWM loading of the PFC can be modeled as a negative resistor; an increase in input voltage to the PWM causes a decrease in the input current. This response dictates the proper compensation of the two ...

Page 11

Z : Compensation Net Work for the Current Loop Transconductance of IEAO PFC Boost Output Voltage; typical designed value OUTDC is 380V and we use the worst condition to calculate the ...

Page 12

Oscillator (RAMP1) The oscillator frequency is determined by the values of R and C , which determine the ramp and off-time of the T oscillator output clock OSC t t RAMP DEADTIME The dead time of the ...

Page 13

C is the required soft start capacitance, and the the desired start-up delay. DEALY It is important that the time constant of the PWM soft-start allow the PFC time to generate sufficient output power for the ...

Page 14

Leading/Trailing Modulation Conventional Pulse Width Modulation (PWM) techniques employ trailing edge modulation in which the switch will turn on right after the trailing edge of the system clock. The error amplifier output is then compared with the modulating ramp up. ...

Page 15

APPLICATION CIRCUIT (Current Mode) +12V L2 +382V R30 R17 T1B C25 R7A R21 R27 R1A R2A C1 VIN AC Preliminary 2002/09/20 Rev. 1 TART- P ...

Page 16

APPLICATION CIRCUIT (Voltage Mode) EMC FILTER R5 R3 IVIN_EMC IVIN L2 L3 RT1 VIN PWM_IN PFC_Vout C7 R27 C22 10n 10n 100k D13 MUR1100 C15 10n VCC C34 100n Q6 Q2N2222 R28 PWM_DC PFC_OUT Q7 ...

Page 17

PACKAGE DIMENSION PIN 1 ID PIN 1 ID Preliminary 2002/09/20 Rev. 1 TART- P URRENT 16-PIN PDIP (P16) 16-PIN SOP (S16), 0.300” Wide Body Champion Microelectronic Corporation CM6824 PFC/PWM C ONTROLLER Page 17 C OMBO ...

Page 18

Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing ...

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