SG6859A Fairchild Semiconductor, SG6859A Datasheet

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SG6859A

Manufacturer Part Number
SG6859A
Description
This highly integrated PWM controller provides several special enhancements designed to meet the low standby-power needs of low-power SMPS
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2007 Fairchild Semiconductor Corporation
SG6859A • Rev. 1.0.4
SG6859A
Low-Cost, Green-Mode PWM Controller for Flyback Converters
Features
Applications
General-purpose switching mode power supplies and
flyback power converters, such as:
Green-Mode PWM
Supports the “Blue Angel” Standard
Low Startup Current: 9μA
Low Operating Current: 3mA
300mA Driving Capability
Leading-Edge Blanking
Constant Output Power Limit
Universal Input
Built-in Synchronized Slope Compensation
Current-Mode Operation
Cycle-by-cycle Current Limiting
Under-Voltage Lockout (UVLO)
Programmable PWM Frequency with Frequency
V
Gate Output Voltage Clamped at 17V
Low Cost
Few External Components Required
Small SSOT-6 Package
Battery chargers for cellular phones, cordless
phones, PDAs, digital cameras, and power tools
Power adapters for ink jet printers, video game
consoles, and portable audio players
Open-frame SMPS for TV/DVD standby and auxiliary
supplies, home appliances, and consumer electronics
Replacements for linear transformers and RCC SMPS
PC 5V standby power
Hopping
DD
Over-Voltage Protection (Auto Restart)
Description
This highly integrated PWM controller provides several
enhancements designed to meet the low standby-power
needs of low-power SMPS. To minimize standby power
consumption, the proprietary green-mode function
provides off-time modulation to linearly decrease the
switching frequency under light-load conditions. This
green-mode function enables the power supply to meet
even the strictest power conservation requirements.
The BiCMOS fabrication process enables reducing the
startup current to 9μA and the operating current to 3mA.
To further improve power conservation, a large startup
resistance can be used. Built-in synchronized slope
compensation ensures the stability of peak current
mode
provides a constant output power limit over a universal
AC input range (90V
limiting ensures safe operation during short-circuits.
To protect the external power MOSFET from damage by
supply over voltage, the SG6859A’s output driver is
clamped at 17V. SG6859A controllers can be used to
improve the performance and reduce the production
cost of power supplies. The best choice for replacing
linear and RCC-mode power adapters, the SG6859A is
available in 8-pin DIP and 6-pin SSOT-6 packages.
control.
Proprietary
AC
to 264V
AC
internal
). Pulse-by-pulse current
August 2010
compensation
www.fairchildsemi.com

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SG6859A Summary of contents

Page 1

... To protect the external power MOSFET from damage by supply over voltage, the SG6859A’s output driver is clamped at 17V. SG6859A controllers can be used to improve the performance and reduce the production cost of power supplies. The best choice for replacing linear and RCC-mode power adapters, the SG6859A is available in 8-pin DIP and 6-pin SSOT-6 packages ...

Page 2

... Part Number SG6859ATZ SG6859ATY SG6859ADZ SG6859ADY (Preliminary) Application Diagram Internal Block Diagram © 2007 Fairchild Semiconductor Corporation SG6859A • Rev. 1.0.4 Operating Temperature Range -40 to +105°C -40 to +105°C -40 to +105°C -40 to +105°C Figure 1. Typical Application Figure 2. Functional Block Diagram ...

Page 3

... Marking Information *Marking for SG6859ATZ (Pb-free) *Marking for SG6859ATY (Green Compound) *Marking for SG6859ADZ (Pb-free) *Marking for SG6859ADY (Green Compound) © 2007 Fairchild Semiconductor Corporation SG6859A • Rev. 1.0.4 AAJF: SG6859A W: Week Code A~Z=W1~W26 AAJFW A~Z=W27~W52 : Lead Free Package XXXX: AAJF=SG6859A T : Die Run Code ...

Page 4

... GND © 2007 Fairchild Semiconductor Corporation SG6859A • Rev. 1.0.4 Description The totem-pole output driver for driving the power MOSFET. Power supply No connection Current sense. This pin senses the voltage across a resistor. When the voltage reaches the internal threshold, PWM output is disabled. This activates over-current protection ...

Page 5

... Electrostatic Discharge Capability, Machine Model, JESD22-A115 Notes: 1. All voltage values, except differential voltages, are given with respect to GND pin. 2. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. © 2007 Fairchild Semiconductor Corporation SG6859A • Rev. 1.0.4 Parameter ( Min. Max ...

Page 6

... MAX V Output Voltage Low GATE-L V Output Voltage High GATE-H t Rising Time r t Falling Time f V Output Clamp Voltage GATE-CLAMP © 2007 Fairchild Semiconductor Corporation SG6859A • Rev. 1.0.4 =25°C. A Conditions DD-ON V =15V Auto Restart Auto Restart R =95kΩ I Center Frequency R =95kΩ ...

Page 7

... Figure 6. Turn-on Threshold Voltage (V vs. Temperature 3.0 2.5 2.0 1.5 1.0 0.5 -40 -25 - Temperature (℃) Figure 8. Startup Current (I 70.0 69.0 68.0 67.0 66.0 65.0 -40 -25 - Temperature (℃) Figure 10. Center Frequency (f © 2007 Fairchild Semiconductor Corporation SG6859A • Rev. 1.0.4 13.0 12.0 11.0 10.0 9.0 8 110 125 -40 ) Figure 7. Turn-off Threshold Voltage (V DD-ON 3.5 3.3 3.1 2.9 2.7 2 110 125 -40 ) vs. Temperature Figure 9 ...

Page 8

... Temperature (℃) Figure 12. Green-Mode Entry FB Voltage (V vs. Temperature 350.0 330.0 310.0 290.0 270.0 250.0 -40 -25 - Temperature (℃) Figure 14. Leading-Edge Blanking Time (t vs. Temperature © 2007 Fairchild Semiconductor Corporation SG6859A • Rev. 1.0.4 3.0 2.8 2.6 2.4 2.2 2 110 125 -40 ) Figure 13. Green-Mode Ending FB Voltage (V FB-N 3.5 3.0 2 ...

Page 9

... Good placement and layout practices should be followed. Avoiding long PCB traces and component leads, locating compensation and filter components near the SG6859A, and increasing power MOS gate resistance improve performance. 9 delay, t ...

Page 10

... EC 470μF/10V 105° 220μF/10V 105°C C10 CC 2.2nF 0805 C11 N.C. D1 Diode FRI07 D2 Diode FR102 D4 Diode SB360 D5 (Optional) ZD 6.8V 0. 1Ω/0.5W L1 20mH 6•8mm © 2007 Fairchild Semiconductor Corporation SG6859A • Rev. 1.0 ...

Page 11

... Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2007 Fairchild Semiconductor Corporation SG6859A • Rev. 1.0.4 9.83 9.00 6.67 6.096 3 ...

Page 12

... Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2007 Fairchild Semiconductor Corporation SG6859A • Rev. 1.0.4 Figure 18. 6-Pin, SSOT-6 Package 12 www.fairchildsemi.com ...

Page 13

... Fairchild Semiconductor Corporation SG6859A • Rev. 1.0.4 13 www.fairchildsemi.com ...

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