FAN400A_2 FAIRCHILD [Fairchild Semiconductor], FAN400A_2 Datasheet

FAN400A_2

Manufacturer Part Number

FAN400A_2

Description

Low-Power Green-Mode PWM Flyback Power Controller

Manufacturer

FAIRCHILD [Fairchild Semiconductor]

Datasheet

1.FAN400A_2.pdf (15 pages)

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FAN400A Rev. 1.0.2

FAN400A —

Controller without Secondary Feedback

Features

Applications

General-purpose, switching mode, power supplies and

flyback power converters, such as:

Ordering Information

FAN400ATY

FAN400ANY

Part Number

Linearly Decreasing PWM Frequency

Green Mode Under Light-Load and Zero-Load

Constant Voltage (CV) and Constant Current (CC)

No Secondary Feedback

Low Startup Current: 8μA

Low Operating Current: 3.6mA

Leading-Edge Blanking

Constant Power Limit

Universal AC Input Range

Synchronized Slope Compensation

140°C OTP Sensor with Hysteresis

Cycle-by-Cycle Current Limiting

Under-Voltage Lockout (UVLO)

Fixed PWM Frequency with Hopping

Gate Output Maximum Voltage Clamped at 17V

Small SSOT-6 Package

Battery Chargers for Cellular Phones, Cordless

Phones, PDAs, Digital Cameras, Power Tools

Power Adapters for Ink Jet Printers, Video Game

Consoles, Portable Audio Players

Open-Frame SMPS for TV/DVD Standby and

Auxiliary Supplies, Home Appliances, Consumer

Electronics

Replacement for Linear Transformers and RCC SMPS

PC 5V Standby Power

Conditions

For Fairchild’s definition of “green” please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

Over-Voltage Clamping

Operating Temperature Range

Low-Power Green-Mode PWM Flyback Power

-40°C to +105°C

Package

Description

This highly integrated PWM controller provides several

features to enhance the performance of low-power

flyback

consumption,

provides off-time modulation to linearly decrease the

switching frequency under light-load and zero-load

conditions. This green mode enables the power supply

to meet international power conservation requirements.

The supply voltage V

compensation, to regulate the output voltage without

requiring a conventional TL431 and a photo-coupler.

Another advantage of the FAN400A is that the typical

startup current is only 8μA, while the typical operating

current can be as low as 3.6mA. A large startup

resistance can be used to achieve even higher power

conversion efficiency.

FAN400A integrates a frequency hopping function

internally to reduce EMI emissions with minimum line

filters.

maintains the stability of peak current-mode control.

Proprietary internal compensation ensures constant

output power limiting over a universal range of AC input

voltages, from 90V

The FAN400A provides many protection functions.

Pulse-by-pulse current limiting ensures constant output

current, even if a short circuit occurs. The internal

protection circuit disables PWM output if V

22.7V. The gate output is clamped at 17V to protect the

power MOS from over-voltage damage. The built-in

over-temperature protection (OTP) function shuts down

the controller at 140°C with a 30°C hysteresis.

The FAN400A is designed to provide a low-cost total

solution for flyback converters. It is available in a small-

footprint, 6-pin, SSOT-6 package.

Related Resources

SSOT-6

DIP-8

AN-400A Low-Power Green-Mode PWM Flyback

Power Controller without Secondary Feedback

Built-in

converters.

Eco Status

synchronized

Green

proprietary

to 264V

is also used for feedback

minimize

green-mode

slope

Packing Method

Tape & Reel

standby

October 2008

compensation

Tube

www.fairchildsemi.com

exceeds

function

power

Related parts for FAN400A_2

FAN400A_2 Summary of contents

Page 1

FAN400A — Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback Features Linearly Decreasing PWM Frequency Green Mode Under Light-Load and Zero-Load Conditions Constant Voltage (CV) and Constant Current (CC) No Secondary Feedback Low Startup Current: 8μA Low Operating Current: ...

Page 2

Page 3

Marking Information Pin Configuration SSOT-6 GND FB NC Pin Definitions DIP SSOT Name Pin # Pin # 1 6 GATE 2 5 VDD SENSE GND © ...

Page 4

Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure ...

Page 5

Electrical Characteristics Unless otherwise noted, V =15V and T DD Symbol Parameter V Section DD V Continuously Operation Voltage DD-OP V Turn-on Threshold Voltage DD-ON V Turn-off Threshold Voltage DD-OFF I Startup Current DD-ST I Operating Supply Current DD-OP V ...

Page 6

Electrical Characteristics Unless otherwise noted, V =15V and T DD Symbol Parameter Oscillator Section f Frequency OSC t Hopping Period HOP f Green Mode Frequency OSC-G V Green Mode Entry FB Voltage FB-N V Green Mode Ending FB Voltage FB-G ...

Page 7

Typical Performance Characteristics 17 16.8 16.6 16.4 16.2 16 -40 -25 - emperature (℃ ) Figure 6. Turn-on Threshold Voltage (V vs. Temperature -40 -25 - ...

Page 8

Typical Performance Characteristics 3 2.8 2.6 2.4 2.2 2 -40 -25 - emperature (℃ ) Figure 12. Green-Mode Entry FB Voltage (V ) vs. Temperature FB-N 300 280 260 240 220 200 -40 -25 -10 5 ...

Page 9

Operation Description FAN400A devices integrate many useful functions for low-power switch-mode power supplies. The following descriptions highlight the key features of the FAN400A. Startup Current The required startup current is only 8μA. This allows a high-resistance, low-wattage startup resistor to ...

Page 10

Operation Description Slope Compensation The sensed voltage across the current sense resistor is used for current mode control and pulse-by-pulse current limiting. The built-in slope compensation improves power supply stability. prevents sub-harmonic oscillations that normally would occur because of peak ...

Page 11

Applications Information Figure 16. BOM Reference Component BD1 BD DI106 1A/600V CX1 (Option) YC 4.7nF/400V (Y1) CY1 (Option) YC 2.2nF/250V (Y1 4.7μF/400V 105° 4.7μF/400V 105° 1nF/1kV C4 EC 10μF/50V C7 (Option) CC 1nF/100V 1206 ...

Page 12

Applications Information Figure 17. BOM Reference Component BD1 BD DI106 1A/600V CY1 (Option) YC 2.2nF/250V (Y1 4.7μF/400V 105° 4.7μF/400V 105° 1nF/1kV C4 EC 10μF/50V C6 CC 4.7nF/0805 C7 (Option) CC 1nF/100V 1206 C8 EC ...

Page 13

Physical Dimensions 5.08 MAX 0.33 MIN (0.56) 2.54 NOTES: UNLESS OTHERWISE SPECIFIED A) THIS PACKAGE CONFORMS TO JEDEC MS-001 VARIATION BA B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR EXTRUSIONS. D) ...

Page 14

Physical Dimensions (Continued) 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 ...

Page 15

Fairchild Semiconductor Corporation FAN400A Rev. 1.0.2 15 www.fairchildsemi.com ...

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