FAN4803

FAN4803CS1 FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

• Internally synchronized PFC and PWM in one 8-pin IC
• Patented one-pin voltage error amplifier with advanced input current shaping technique
• Peak or average current, continuous boost, leading edge PFC (Input Current Shaping Technology)
• High efficiency 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 V CC OVP with PFC Soft Start General Description 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 compli- ant to IEC1000-3-2 specifications. 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 ISENSE VEAO VDC ILIMIT GND PWM OUT PFC OUT COMP COMP 35µA 16.2V 17.5V VCC COMP ––1V SOFT START PFC/PWM UVLO DUTY CYCLE LIMIT OSCILLATOR PFC – 67kHz PWM – 134kHz VREF VREF 1.2V 26k 40k R1 C1 30pF PWM CONTROL LOGIC 1.5V DC ILIMIT PFC ILIMIT PWM COMPARATOR VCC OVP PFC OFF ONE PIN ERROR AMPLIFIER LEADING EDGE PFC TRAILING EDGE PWM COMP 7V + COMP REFVCC PFC CONTROL LOGIC FAN4803 8-Pin PFC and PWM Controller Combo

FAN4803 PRODUCT SPECIFICATION REV. 1.2.3 11/2/04 Pin Configuration Pin Description PFC OUT GND ISENSE VEAO PWM OUT VCC ILIMIT VDC TOP VIEW 8-Pin SOIC (S08) 8-Pin PDIP (P08) FAN4803 Pin Name Function

1 PFC OUT PFC driver output

2 GND Ground

Current sense input to the PFC current limit comparator

4 VEAO PFC one-pin error amplifier input

PWM voltage feedback input LIMIT PWM current limit comparator input CC Positive supply (may require an external shunt regulator)

8 PWM OUT PWM driver output

Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. Operating Conditions Parameter Min Max Unit I CC Current (average) 40 mA V CC MAX 18.3 V I SENSE Voltage -5 1 V Voltage on Any Other Pin GND – 0.3 V CC + 0.3 V Peak PFC OUT Current, Source or Sink 1 A Peak PWM OUT Current, Source or Sink 1 A PFC OUT, PWM OUT Energy Per Cycle 1.5 µJ Junction Temperature 150 °C Storage Temperature Range -65 ° 150 °C Lead Temperature (Soldering, 10 sec) 260 °C Thermal Resistance ( θ JA Plastic DIP 110 °C/W Plastic SOIC 160 °C/W Temperature Range FAN4803CS-X 0 °C to 70°C FAN4803CP-X 0 °C to 70°C

PRODUCT SPECIFICATION FAN4803 REV. 1.2.3 11/2/04

Electrical Characteristics

Unless otherwise specified, V CC = 15V , T A = Operating Temperature Range (Note 1) Note: 1. Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions. Symbol Parameter Conditions Min TYP MAX UNITS One-pin Error Amplifier V EAO Output Current T A = 25°C, V EAO = 6V 34.0 36.5 39.0 µA Line Regulation 10V < V CC < 15V, V EAO = 6V 0.1 0.3 µA V CC OVP Comparator Threshold Voltage 15.5 16.3 16.8 V PFC I LIMIT Comparator Threshold Voltage -0.9 -1 -1.15 V Delay to Output 150 300 ns DC I LIMIT Comparator Threshold Voltage 1.4 1.5 1.6 V Delay to Output 150 300 ns Oscillator Initial Accuracy T A = 25°C 60 67 74 kHz Voltage Stability 10V < V CC < 15V 1 % Temperature Stability 2 % Total Variation Over Line and Temp 60 67 74.5 kHz Dead Time PFC Only 0.3 0.45 0.65 µs PFC Minimum Duty Cycle V EAO > 7.0V,I SENSE = -0.2V 0 % Maximum Duty Cycle V EAO < 4.0V,I SENSE = 0V 90 95 % Output Low Impedance 8 15 Ω Output Low Voltage I OUT = –100mA 0.8 1.5 V I OUT = –10mA, V CC = 8V 0.7 1.5 V Output High Impedance 8 15 Ω Output High Voltage I OUT = 100mA, V CC = 15V 13.5 14.2 V Rise/Fall Time C L = 1000pF 50 ns PWM Duty Cycle Range FAN4803-2 0-41 0-47 0-50 % FAN4803-1 0-49.5 0-50 % Output Low Impedance 8 15 Ω Output Low Voltage I OUT = –100mA 0.8 1.5 V I OUT = –10mA, V CC = 8V 0.7 1.5 V Output High Impedance 8 15 Ω Output High Voltage I OUT = 100mA, V CC = 15V 13.5 14.2 V Rise/Fall Time C L = 1000pF 50 ns Supply V CC Clamp Voltage (V CCZ CC = 10mA 16.7 17.5 18.3 V Start-up Current V CC = 11V, C L = 0 0.2 0.4 mA Operating Current V CC = 15V, C L = 0 2.5 4 mA Undervoltage Lockout Threshold 11.5 12 12.5 V Undervoltage Lockout Hysteresis 2.4 2.9 3.4 V

grounding techniques should be used. turn ON right after the trailing edge of the system clock. 2 shows a typical trailing edge control scheme. Figure 2. Typical Trailing Edge Control Scheme.

reducing dissipation in the high-voltage PFC capacitor. ming resistor. The nominal voltage at the VEAO pin is 5V . VEAO, the boost output voltage would be 400V . to limit the amount of line current harmonic distortion. the error amplifier gain at the loop unity-gain frequency. displays a simplified model of the voltage loop. Figure 3. Typical Leading Edge Control Scheme.

state operating point is reached. See Figure 8. which the VEAO pin may rise in a shutdown condition. Once VCC reaches 12V both the PFC and PWM are enabled. The UVLO threshold is 9.1V providing 2.9V of hysteresis. Figure 8. PFC Soft Start Figure 9. ISENSE Offset for Light Load Conditions

Figure 12. Typical Application Circuit. Universal Input 240W 12V DC Output

PRODUCT SPECIFICATION FAN4803 REV. 1.2.3 11/2/04 11 Mechanical Dimensions SEA TI N G PLA N E 0.148 - 0.158 (3.76 - 4.01)PI N 1 I D 0.228 - 0.244 (5.79 - 6.20) 0.189 - 0.19 Package: S08

8 Pin SOIC

(4.80 - 5.06) 0.012 - 0.020 (0.30 - 0.51)

0.050 BS C

(1.27 BS C) 0.015 - 0.035 (0.38 - 0.89) 0.059 - 0.069 (1.49 - 1.75) 0.004 - 0.010 (0.10 - 0.26) 0.055 - 0.061 (1.40 - 1.55) 0.006 - 0.010 (0.15 - 0.26) 0°–8° 0.017 - 0.027 (0.43 - 0.69) ( 4 PLA CES) SEATING PLANE 0.240 - 0.260 (6.09 - 6.60)PIN 1 ID 0.299 - 0.335 (7.59 - 8.50) 0.365 - 0.385 (9.27 - 9.77) 0.016 - 0.020 (0.40 - 0.51)

0.100 BSC

(2.54 BSC) 0.008 - 0.012 (0.20 - 0.31)

0.015 MIN

(0.38 MIN) 0° - 15° 0.055 - 0.065 (1.39 - 1.65)

0.170 MAX

(4.32 MAX)

0.125 MIN

(3.18 MIN)

0.020 MIN

(0.51 MIN) (4 PLACES) Package: P08 8-Pin PDIP

FAN4803 PRODUCT SPECIFICATION 11/2/04 0.0m 003 Stock#DS30004803  2004 Fairchild Semiconductor Corporation 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: 1. 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. 2. 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. www.fairchildsemi.com 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.

Ordering Information

Part Number PFC/PWM Frequency Temperature Range Package FAN4803CS-1 67kHz / 67kHz 0 °C to 70°C 8-Pin SOIC (S08) FAN4803CS-2 67kHz / 134kHz 0 °C to 70°C 8-Pin SOIC (S08) FAN4803CP-1 67kHz / 67kHz 0 °C to 70°C 8-Pin PDIP (P08) FAN4803CP-2 67kHz / 134kHz 0 °C to 70°C 8-Pin PDIP (P08)