FAN4803CS1

FAN4803CS1 Datasheet

FAN4803

Part	Datasheet
FAN4803CS1	FAN4803CS1 (pdf)

Related Parts	Information
FAN4803CP2	FAN4803CP2
FAN4803CS1X	FAN4803CS1X
FAN4803CS2	FAN4803CS2
FAN4803CS2X	FAN4803CS2X
FAN4803CP1	FAN4803CP1
FAN4803CP2_NA3E220	FAN4803CP2_NA3E220

PDF Datasheet Preview
FAN4803 8-Pin PFC and PWM Controller Combo • Internally synchronized PFC and PWM in one 8-pin IC • Patented one-pin voltage error with advanced input current shaping technique • Peak or average current, continuous boost, leading edge PFC Input Current Shaping Technology • High trailing-edge current mode PWM • Low supply currents start-up 150µA typ., operating: 2mA typ. • Synchronized leading and trailing edge modulation • Reduces ripple current in the storage capacitor between the PFC and PWM sections • Overvoltage, UVLO, and brownout protection • PFC VCCOVP with PFC Soft Start The FAN4803 is a space-saving controller for power factor corrected, switched mode power supplies that offers very low start-up and operating currents. Power Factor Correction PFC offers the use of smaller, lower cost bulk capacitors, reduces power line loading and stress on the switching FETs, and results in a power supply fully compliant to IEC1000-3-2 The FAN4803 includes circuits for the implementation of a leading edge, average current “boost” type PFC and a trailing edge, PWM. The FAN4803-1’s PFC and PWM operate at the same frequency, 67kHz. The PFC frequency of the FAN4803-2 is automatically set at half that of the 134kHz PWM. This higher frequency allows the user to design with smaller PWM components while maintaining the optimum operating frequency for the PFC. An overvoltage comparator shuts down the PFC section in the event of a sudden decrease in load. The PFC section also includes peak current limiting for enhanced system reliability. Block Diagram VEAO 4 7V + PFC OFF COMP 35µA 7 VCC 17.5V 16.2V C1 30pF ISENSE 3 ONE PIN ERROR AMPLIFIER + PFC ILIMIT PFC/PWM UVLO + COMP VREF 26k VDC 5 40k ILIMIT 6 1.2V OSCILLATOR PFC 67kHz PWM 134kHz DUTY CYCLE LIMIT PWM COMPARATOR COMP + COMP + 1.5V DC ILIMIT + VCC OVP COMP VREF GND 2 PFC CONTROL LOGIC SOFT START PFC OUT 1 LEADING EDGE PFC TRAILING EDGE PWM PWM CONTROL Ordering Information Part Number FAN4803CS-1 FAN4803CS-2 FAN4803CP-1 FAN4803CP-2 PFC/PWM Frequency 67kHz / 67kHz / 134kHz 67kHz / 67kHz / 134kHz Temperature Range 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C PRODUCT SPECIFICATION Package 8-Pin SOIC S08 8-Pin SOIC S08 8-Pin PDIP P08 8-Pin PDIP P08 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 11/2/04 0.0m 003 Stock#DS30004803 Fairchild Semiconductor Corporation

PDF Datasheet Preview

FAN4803
8-Pin PFC and PWM Controller Combo
• Internally synchronized PFC and PWM in one 8-pin IC
• Patented one-pin voltage error with advanced
input current shaping technique
• Peak or average current, continuous boost, leading edge

PFC Input Current Shaping Technology
• High trailing-edge current mode PWM
• Low supply currents start-up 150µA typ., operating:
2mA typ.
• Synchronized leading and trailing edge modulation
• Reduces ripple current in the storage capacitor between
the PFC and PWM sections
• Overvoltage, UVLO, and brownout protection
• PFC VCCOVP with PFC Soft Start

The FAN4803 is a space-saving controller for power factor corrected, switched mode power supplies that offers very low start-up and operating currents.

Power Factor Correction PFC offers the use of smaller, lower cost bulk capacitors, reduces power line loading and stress on the switching FETs, and results in a power supply fully compliant to IEC1000-3-2 The FAN4803 includes circuits for the implementation of a leading edge, average current “boost” type PFC and a trailing edge, PWM.

The FAN4803-1’s PFC and PWM operate at the same frequency, 67kHz. The PFC frequency of the FAN4803-2 is automatically set at half that of the 134kHz PWM. This higher frequency allows the user to design with smaller PWM components while maintaining the optimum operating frequency for the PFC. An overvoltage comparator shuts down the PFC section in the event of a sudden decrease in load. The PFC section also includes peak current limiting for enhanced system reliability.

Block Diagram

VEAO 4
7V + PFC OFF COMP
35µA
7 VCC
17.5V 16.2V

C1 30pF

ISENSE 3

ONE PIN ERROR AMPLIFIER
+ PFC ILIMIT

PFC/PWM UVLO
+ COMP

VREF 26k VDC 5 40k

ILIMIT 6
1.2V

OSCILLATOR PFC 67kHz PWM 134kHz

DUTY CYCLE LIMIT

PWM COMPARATOR COMP +

COMP +
1.5V

DC ILIMIT
+ VCC OVP COMP

VREF

GND 2

PFC CONTROL

LOGIC

SOFT START

PFC OUT 1

LEADING EDGE PFC

TRAILING EDGE PWM

PWM CONTROL
Ordering Information

Part Number FAN4803CS-1 FAN4803CS-2 FAN4803CP-1 FAN4803CP-2

PFC/PWM Frequency 67kHz / 67kHz / 134kHz 67kHz / 67kHz / 134kHz

Temperature Range 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°C

PRODUCT SPECIFICATION

Package 8-Pin SOIC S08 8-Pin SOIC S08 8-Pin PDIP P08 8-Pin PDIP P08

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
11/2/04 0.0m 003 Stock#DS30004803 Fairchild Semiconductor Corporation

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Datasheet ID: FAN4803CS1 513896