CM6800AGISTR CHAMP [Champion Microelectronic Corp.], CM6800AGISTR Datasheet

CM6800AGISTR

Manufacturer Part Number

CM6800AGISTR

Description

LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO

Manufacturer

CHAMP [Champion Microelectronic Corp.]

Datasheet

1.CM6800AGISTR.pdf (18 pages)

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GENERAL DESCRIPTION

The CM6800A 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, CM6800A

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.

CM6800A includes an additional folded-back current limit

for PWM section to provide short circuit protection function.

APPLICATIONS

2009/08/10

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

Rev. 1.6

Champion Microelectronic Corporation

TART-

FEATURES

PIN CONFIGURATION

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

PWM in one IC

ultra-fast PFC response

PFC and PWM sections

edge PFC

operation

start, and Reference OK

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

Pin to pin compatible with ML4800 and FAN4800

Additional folded-back current limit for PWM section.

23V Bi-CMOS process

VIN OK turn on PWM at 2.25V instead of 1.5V(ML4800).

Internally synchronized leading edge PFC and trailing edge

Slew rate enhanced transconductance error amplifier for

Low start-up current (100

Low operating current (3.0mA type.)

Low total harmonic distortion, high PF

Reduces ripple current in the storage capacitor between the

Average current, continuous or discontinuous boost leading

VCC OVP Comparator, Low Power Detect Comparator

PWM configurable for current mode or voltage mode

Current fed gain modulator for improved noise immunity

Brown-out control, over-voltage protection, UVLO, and soft

URRENT

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

PFC/PWM C

IEAO

RAM P1

RAM P2

SENSE

RMS

Top View

A typ.)

PW M OUT

PFC OUT

DC I

VEAO

GND

LIMIT

ONTROLLER

REF

CM6800A

Page 1

OMBO

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CM6800AGISTR Summary of contents

Page 1

GENERAL DESCRIPTION The CM6800A 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

... Vcc 20uA 350 SPST SW SPST SW SPST VREF DC ILIMIT 9 GND 10 ORDERING INFORMATION Part Number CM6800AGIP* CM6800AXIP* CM6800AGIS* CM6800AGISTR* CM6800AXIS* CM6800AXISTR Suffix for Pb Free Product *Note Suffix for Halogen Free Product TR : Package is Typing Reel 2009/08/10 Rev. 1 TART- P URRENT 1 IEAO VCC OVP ...

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, R =30.16kΩ 1000pF Symbol Parameter Sink Current Source Current Open Loop Gain Power Supply Rejection Ratio Threshold Voltage Hysteresis Threshold Voltage Threshold Voltage Hysteresis Fault Detect HIGH Time to Fault Detect HIGH ...

Page 6

ELECTRICAL CHARACTERISTICS Vcc=+15V 30.16kΩ 1000pF Symbol Parameter Initial Accuracy Voltage Stability Temperature Stability Total Variation Ramp Valley to Peak Voltage PFC Dead Time (Note 4) CT Discharge Current Output Voltage Line Regulation Load ...

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 CM6800A 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

VEAO - 0.3V + LOW POWER DETECT VFB GMv 18 - 3.5K . 2.5V + IAC 2 GAIN VRMS MODULATOR 4 ISENSE 3 RAMP1 7 Error Amplifier Compensation The PWM loading of the PFC can be modeled as a ...

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 ...

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 (Voltage Mode) EMC FILTER R5 R3 IVIN IVIN_EMC 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 PWM_OUT Q7 ...

Page 16

APPLICATION CIRCUIT (Current Mode) EMC FILTER R5 R3 IVIN IVIN_EMC 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 PWM_OUT Q7 ...

Page 17

PACKAGE DIMENSION PIN 1 ID PIN 1 ID 2009/08/10 Rev. 1 TART- P URRENT 16-PIN PDIP (P16) 16-PIN SOP (S16), 0.300” Wide Body θ 　 Champion Microelectronic Corporation CM6800A PFC/PWM C ONTROLLER θ Page 17 ...

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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