FAN4800I Fairchild Semiconductor, FAN4800I Datasheet

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FAN4800I

Manufacturer Part Number
FAN4800I
Description
The FAN4800 is a controller for power-factor-corrected, switched-mode power supplies
Manufacturer
Fairchild Semiconductor
Datasheet

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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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FAN4800I Summary of contents

Page 1

... Telecom System Power Supply Distributed Power Ordering Information Part Number Temperature Range FAN4800IN FAN4800IN_G © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 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- ...

Page 2

... I SENSE 3 RAMP1 7 RAMP2 350 8 0. 20μA SS 350 5 V REF DC I LIMIT 9 © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0 POWER FACTOR CORRECTOR EAO V OVP 2.78V 17.9V Low Power TRI-FAULT Detector 0.5V PFC CMP 3.5k OSCILLATOR DUTY CYCLE LIMIT PWM CMP SS CMP 1 ...

Page 3

... RAMP1 (RtCt) 8 RAMP2 (PWM RAMP LIMIT 10 GND 11 PWM OUT 12 PFC OUT REF EAO © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0 EAO EAO SENSE REF RMS ...

Page 4

... Peak PWM OUT Current, Source or Sink PWM_OUT PFC OUT, PWM OUT Energy per Cycle T Junction Temperature J T Storage Temperature Range STG T Operating Temperature Range A T Lead Temperature (Soldering,10 Seconds) L θ Thermal Resistance JA © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 Parameter 4 Min. Max. Unit 5.5 V -3.0 0.7 V GND-0.3 V +0.3 ...

Page 5

... LOW-POWER DETECT COMPARATOR V (lp) Threshold Voltage th VCC OVP COMPARATOR V Threshold Voltage CC_OVP HY(V ) Hysteresis CC_OVP TRI-FAULT DETECT t Time to Fault Detect HIGH d(F) F(L) Fault Detect LOW © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 = 15V 52.3KΩ Condition ( 25° 25° 3V ...

Page 6

... Line Regulation ref1 ΔV Load Regulation ref2 ΔV Temperature Stability ref4 (1) V Total Variation ref2 ΔV Long Term Stability ref5 © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 (Continued) = 15V 52.3kΩ Condition – Gain Modulator I = 100μ RMS 25°C ...

Page 7

... V Under-Voltage Lockout Hysteresis th(hys) Notes: 1. This parameter, although guaranteed by design, is not 100% production tested. 2. Includes all bias currents to other circuits connected to the V 3. Gain = K × 5.375V SENSE © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 (Continued) = 15V 52.3kΩ Condition V > ...

Page 8

... 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 0.5 1.0 1.5 2.0 2.5 V (V) RMS Figure 5. Gain Modulator Transfer Characteristic (K) − GAINMOD OFFSET K × − 0.625) AC © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 100 -10 2.6 2.7 2.8 2.9 3.0 -0.8 Figure 4. Current Error Amplifier (gmi) 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 3.0 3.5 4.0 4.5 5.0 0.0 − ...

Page 9

... Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 One of these conditions is that the output voltage of the boost converter must be set higher than the peak value of the line voltage ...

Page 10

... The negative voltage on I SENSE currents flowing in the PFC circuit and is typically derived from a current sense resistor in series with the negative terminal of the input bridge rectifier. © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 . The The inverting input of the current error amplifier is a vir- EAO tual ground ...

Page 11

... Figure 4. This raises the gain-bandwidth product of the voltage loop, resulting in a much more rapid voltage loop response to such perturbations than would occur with conventional linear gain characteristics. © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0 POWER FACTOR CORRECTOR ...

Page 12

... SENSE 2) To reduce L, the boost inductor: The I can reduce the boost inductor value since the I filter behaves like an integrator before the I which is the input of the current error amplifier, I © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 The I SENSE I filter is between 100Ω and 50Ω because I ...

Page 13

... PWM power cycle. When the DC I LIMIT © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 cycle current, it also softly discharges the voltage of the soft-start capacitor. It limits the PWM duty cycle mode and the power dissipation is reduced during the dead- short condition ...

Page 14

... In most applications, an electrolytic capacitor of between 47μF and 220μF is also required across the part both for filtering and as a part of the startup boot- strap circuitry. © 2005 Fairchild Semiconductor Corporation FAN4800 Rev. 1.0.6 2.8 Leading/Trailing Modulation Conventional PWM techniques employ trailing-edge modulation, in which the switch turns on right after the trailing edge of the system clock ...

Page 15

... 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 DFF CMP CLK Figure 10. Typical Trailing-Edge Control Scheme DFF CMP ...

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

... Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specif- ically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’ ...

Page 19

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

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