FAN4800_10 FAIRCHILD [Fairchild Semiconductor], FAN4800_10 Datasheet

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FAN4800_10

Manufacturer Part Number
FAN4800_10
Description
Low Startup Current PFC/PWM Controller Combinations
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
1.FAN4800_10.pdf (19 pages)
FAN4800 Rev. 1.0.6
© 2005 Fairchild Semiconductor Corporation
FAN4800
Low Startup Current PFC/PWM Controller Combinations
Features
Applications
Ordering Information
Low Startup Current (100µA Typical)
Low Operating Current (2.5mA Typical)
Low Total Harmonic Distortion, High Power Factor
Pin-Compatible Upgrade for the ML4800
Average Current, Continuous or Discontinuous Boost,
Leading-Edge PFC
Slew Rate Enhanced Transconductance Error
Amplifier for Ultra-Fast PFC Response
Internally Synchronized Leading-Edge PFC and
Trailing-Edge PWM
Reduction of Ripple Current in the Storage Capacitor
between the PFC and PWM Sections
PWM Configurable for Current Mode or Voltage Mode
Additional Folded-Back Current Limit for PWM Section
20V BiCMOS Process
V
V
Current-Fed Gain Modulator for Improved Noise
Immunity
Brownout Control, Over-Voltage Protection, UVLO,
Soft-Start, and Reference OK
Available in16-DIP Package
Desktop PC Power Supply
Internet Server Power Supply
Uninterruptible Power Supply (UPS)
Battery Charger
DC Motor Power Supply
Monitor Power Supply
Telecom System Power Supply
Distributed Power
IN
CC
Part Number
FAN4800IN_G
FAN4800IN
OK Guaranteed Turn-on PWM at 2.25V
OVP Comparator, Low-Power Detect Comparator
Temperature Range
-40°C to +125°C
-40°C to +125°C
Operating
Description
The FAN4800 is a controller for power-factor-corrected,
switched-mode power supplies. Power Factor Correction
(PFC) allows the use of smaller, lower-cost bulk capaci-
tors, reduces power line loading and stress on the
switching FETs, and results in a power supply that fully
complies with IEC-1000-3-2 specifications. Intended as a
BiCMOS version of the industry-standard ML4800, the
FAN4800 includes circuits for the implementation of
leading-edge, average-current, boost-type power factor
correction and a trailing-edge Pulse Width Modulator
(PWM). A gate driver with 1A capabilities minimizes the
need for external driver circuits. Low-power require-
ments 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 sec-
tion 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.
The FAN4800 includes a folded-back current limit for the
PWM section to provide short-circuit protection.
Package
16-PDIP
16-PDIP
16-PDIP
Packing
Method
Rail
Rail
November 2010
FAN4800
FAN4800
www.fairchildsemi.com
Marking
Code

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FAN4800_10 Summary of contents

Page 1

FAN4800 Low Startup Current PFC/PWM Controller Combinations Features Low Startup Current (100µA Typical) Low Operating Current (2.5mA Typical) Low Total Harmonic Distortion, High Power Factor Pin-Compatible Upgrade for the ML4800 Average Current, Continuous or Discontinuous Boost, Leading-Edge PFC Slew Rate ...

Page 2

Block Diagram 16 V EAO 0.3V 2.5V 3. GAIN V RMS MODULATOR 4 I SENSE 3 RAMP1 7 RAMP2 350 8 0. 20μA SS 350 5 V REF DC ...

Page 3

Pin Configuration Pin Definitions Pin # Name 1 I EAO SENSE 4 V RMS RAMP1 (RtCt) 8 RAMP2 (PWM RAMP LIMIT 10 GND 11 PWM OUT ...

Page 4

Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera- ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi- tion, ...

Page 5

Electrical Characteristics Unless otherwise stated, these specifications apply: V Symbol Parameter VOLTAGE ERROR AMPLIFIER V Input Voltage Range FB gm1 Transconductance V (PFC) Feedback Reference Voltage ref Input Bias Current b EAO V (H) Output High-Voltage EAO ...

Page 6

Electrical Characteristics Unless otherwise stated, these specifications apply: V Symbol Parameter PFC I COMPARATOR LIMIT V Threshold Voltage th(cs) (PFC I V LIMIT th(cs) gm Output) (1) t Delay to Output d(pfc_off COMPARATOR LIMIT V ...

Page 7

Electrical Characteristics Unless otherwise stated, these specifications apply: V Symbol Parameter PFC D Minimum Duty Cycle min. D Maximum Duty Cycle max. R (low)1 ON Output Low R dson R (low)2 ON Vol1 Output Low Voltage R (high)1 ON Output ...

Page 8

Typical Performance Characteristics 126 119 112 105 2.0 2.1 2.2 2.3 2.4 2.5 V (V) FB Figure 3. Voltage Error Amplifier (gmv) Transconductance 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 0.0 ...

Page 9

Functional Description The FAN4800 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 mode, feed ...

Page 10

The output of the voltage error amplifier, V gain modulator responds linearly to variation in V The output of the gain modulator is a current signal, in the form of a full wave rectified sinusoid at twice the line ...

Page 11

V EAO 0.3V 2.5V 3. GAIN V RMS MODULATOR 4 I SENSE 3 RAMP1 7 1.6 Error Amplifier Compensation The PWM loading of the PFC can be modeled as a neg- ative resistor ...

Page 12

Z : Compensation network for the current loop Transconductance EAO V : PFC boost output voltage (typical designed OUTDC value is 380V). The equation uses the worst- case condition to calculate the Z ...

Page 13

Example For the application circuit shown in Figures 12 and 13, with the oscillator running at 100kHz OSC t solving for yields 1. 51.1kΩ, selecting standard components ...

Page 14

Generating V CC After turning on the FAN4800 at 13V, the operating volt- age can vary from 10V to 17.9V. The threshold voltage of the V OVP comparator is 17.9V and its hysteresis is CC 1.5V. When V reaches ...

Page 15

SW2 VIN DC SW1 REF U3 VEAO EA RAMP OSC CLK U4 SW2 VIN DC SW1 U3 VEAO EA REF RAMP OSC CLK U4 © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0 ...

Page 16

Typical Application Circuit © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 Figure 12. Current-Mode Application 16 www.fairchildsemi.com ...

Page 17

Typical Application Circuit © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 (Continued) Figure 13. Voltage-Mode Application 17 www.fairchildsemi.com ...

Page 18

Physical Dimensions 16 1 (0.40) 0.38 MIN 5.33 MAX 2.54 NOTES: UNLESS OTHERWISE SPECIFIED A THIS PACKAGE CONFORMS TO JEDEC MS-001 VARIATION BB B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR ...

Page 19

Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 19 www.fairchildsemi.com ...

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