FAN4800IM

FAN4800IM Datasheet

FAN4800 Low Start-Up Current PFC/PWM Controller Combos

Part	Datasheet
FAN4800IM	FAN4800IM (pdf)

Related Parts	Information
FAN4800IN	FAN4800IN
FAN4800IMX	FAN4800IMX

PDF Datasheet Preview
FAN4800 Low Start-Up Current PFC/PWM Controller Combos November 2006 FAN4800 Low Start-Up Current PFC/PWM Controller Combos - Low start-up 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 operation - Additional folded-back current limit for PWM section - 20V BiCMOS process - VIN OK guaranteed turn-on PWM at 2.25V - VCC OVP comparator, low-power detect comparator - Current-fed gain modulator for improved noise immunity - Brownout control, over-voltage protection, UVLO, soft-start, and reference OK - Available in 16-DIP, 16-SOIC wide packages - 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 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 capacitors, 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 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. The FAN4800 includes a folded-back current limit for the PWM section to provide short-circuit protection. 16-PDIP 16-SOIC Ordering Information Part Number FAN4800IN FAN4800IM FAN4800IMX Operating Temp. Range -40°C to +125°C -40°C to +125°C -40°C to +125°C Pb-Free Yes Package 16-PDIP 16-SOIC 16-SOIC Packing Method Rail Tape & Reell Marking Code FAN4800 FAN4800 Low Start-Up Current PFC/PWM Controller Combos Block Diagram 16 VEAO 15 VFB 2.5V 0.3V 2 IAC 4 VRMS 3 ISENSE RAMP1 7 GAIN MODULATOR 1 IEAO Low Power Detector 3.5k POWER FACTOR CORRECTOR VCC 17.9V VCC OVP 2.78V TRI-FAULT PFC OVP 0.5V -1V 3.5k PFC CMP PFC ILIMIT OSCILLATOR 13 VCC 7.5V REFERENCE VREF 14 PFC OUT 12 8 RAMP2 6 VDC 0.9V 20uA VREF 9 DC ILIMIT PWM CMP DUTY CYCLE LIMIT

PDF Datasheet Preview

FAN4800 Low Start-Up Current PFC/PWM Controller Combos

November 2006

FAN4800 Low Start-Up Current PFC/PWM Controller Combos
- Low start-up 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
operation - Additional folded-back current limit for PWM section - 20V BiCMOS process - VIN OK guaranteed turn-on PWM at 2.25V - VCC OVP comparator, low-power detect comparator - Current-fed gain modulator for improved noise
immunity - Brownout control, over-voltage protection, UVLO,
soft-start, and reference OK - Available in 16-DIP, 16-SOIC wide packages
- 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

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 capacitors, 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 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.

The FAN4800 includes a folded-back current limit for the PWM section to provide short-circuit protection.
16-PDIP
16-SOIC
Ordering Information

Part Number FAN4800IN FAN4800IM FAN4800IMX

Operating Temp. Range -40°C to +125°C -40°C to +125°C -40°C to +125°C

Pb-Free Yes

Package 16-PDIP 16-SOIC 16-SOIC

Packing Method

Rail Tape & Reell

Marking Code

FAN4800

FAN4800 Low Start-Up Current PFC/PWM Controller Combos

Block Diagram
16 VEAO
15 VFB 2.5V
0.3V
2 IAC 4 VRMS 3 ISENSE

RAMP1 7

GAIN MODULATOR
1 IEAO

Low Power Detector
3.5k

POWER FACTOR CORRECTOR

VCC 17.9V

VCC OVP 2.78V

TRI-FAULT

PFC OVP
0.5V -1V
3.5k

PFC CMP

PFC ILIMIT

OSCILLATOR
13 VCC
7.5V REFERENCE

VREF 14

PFC OUT 12
8 RAMP2
6 VDC
0.9V
20uA

VREF 9 DC ILIMIT

PWM CMP

DUTY CYCLE LIMIT

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Datasheet ID: FAN4800IM 513893