SG6860 Fairchild Semiconductor, SG6860 Datasheet

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SG6860

Manufacturer Part Number
SG6860
Description
Green-Mode PWM Controller
Manufacturer
Fairchild Semiconductor
Datasheet

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Part Number:
SG6860TZ
Manufacturer:
Fairchild Semiconductor
Quantity:
135
© 2008 Fairchild Semiconductor Corporation
SG6860 • Rev. 1.0.1
www.DataSheet4U.com
SG6860
Low-Cost, Green-Mode PWM Controller for
Flyback Converters
Features
Applications
Ordering Information
SG6860TZ
SG6860DZ
Part Number
All packages are lead free per JEDEC: J-STD-020B standard.
Green-Mode PWM
Supports the “Blue Angel” Eco Standard
Low Start-up Current: 9µA
Low Operating Current: 3mA
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
Hopping
V
Gate Output Voltage Clamped at 17V
Low Cost
Few External Components Required
Small SOT-26 Package
Power Adaptors
Open-Frame SMPS
DD
Over-Voltage Protection (Latch off)
Operating Temperature Range
-40°C to +85°C
-40°C to +85°C
Small SOT-26 Package
8-pin Dual in-line Package (DIP)
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,
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 strict power conservation requirements.
The BiCMOS fabrication process enables reducing the
start-up current to 9µA and the operating current to
3mA. To further improve power conservation, a large
start-up resistance can be used. Built-in synchronized
slope compensation ensures the stability of peak
current mode control. Proprietary internal compensation
provides a constant output power limit over a universal
AC input range (90V
current limiting ensures safe operation even during
short-circuits.
To protect the external power MOSFET from being
damaged by supply over voltage, the SG6860’s output
driver is clamped at 17V. SG6860 controllers can
improve the performance and reduce the production
cost of power supplies. The SG6860 can replace linear
and RCC-mode power adapters. It is available in 8-pin
DIP and 6-pin SOT-26 packages.
Package
a
proprietary
AC
to 264V
green-mode
AC
Packing Method
). Pulse-by-pulse
Tape & Reel
March 2008
www.fairchildsemi.com
Rail
function

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SG6860 Summary of contents

Page 1

... SG6860’s output driver is clamped at 17V. SG6860 controllers can improve the performance and reduce the production cost of power supplies. The SG6860 can replace linear and RCC-mode power adapters available in 8-pin DIP and 6-pin SOT-26 packages. ...

Page 2

... Application Diagram www.DataSheet4U.com Block Diagram © 2008 Fairchild Semiconductor Corporation SG6860 • Rev. 1.0 10µ SG6860 Figure 1. Typical Application Figure 2. Function Block Diagram 2 www.fairchildsemi.com ...

Page 3

... Connection. 7 (2) FB Feedback. 8 (1) GND Ground. For ATX SMPS, it detects AC line voltage through the main transformer. © 2008 Fairchild Semiconductor Corporation SG6860 • Rev. 1.0.1 Figure 4. SOT Pin Configuration (Top View) , and a 70kHz switching frequency results in a 13µA I www.fairchildsemi.com ...

Page 4

... The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol T Operating Ambient Temperature A © 2008 Fairchild Semiconductor Corporation SG6860 • Rev. 1.0.1 Parameter SOT DIP Parameter 4 Min. Max. ...

Page 5

... Output Voltage Low GATE-L V Output Voltage High GATE-H t Rising Time r t Falling Time f V GATE- Output Clamp Voltage CLAMP © 2008 Fairchild Semiconductor Corporation SG6860 • Rev. 1.0.1 Conditions V =V – 0.1V DD DD-ON V =15V, GATE with DD 1nF to GND Latch off Latch off V = =95KΩ ...

Page 6

... Temperature (℃) Figure 5. V DD-ON 15.0 13.0 11.0 9.0 7.0 5.0 -40 -25 - Temperature (℃) Figure 7. I DD-ST 67.0 66.8 66.6 66.4 66.2 66.0 -40 -25 - Temperature (℃) Figure 9. f OSC © 2008 Fairchild Semiconductor Corporation SG6860 • Rev. 1.0.1 9.6 9.4 9.2 9.0 8.8 8 110 125 vs 3.5 3.3 3.1 2.9 2.7 2.5 -40 -25 - 110 125 vs 75.0 74.6 74.2 73.8 73.4 73.0 50 ...

Page 7

... Temperature (℃) Figure 11. V FB-N 400 360 320 280 240 200 -40 -25 - Temperature (℃) Figure 13. t LEB © 2008 Fairchild Semiconductor Corporation SG6860 • Rev. 1.0.1 (Continued) 2.30 2.26 2.22 2.18 2.14 2.10 -40 -25 - 110 125 vs 110 125 vs ...

Page 8

... This UVLO hysteresis window ensures that the hold-up capacitor is adequate to supply V Gate Output The SG6860 BiCMOS output stage is a fast totem pole gate driver. Cross conduction has been avoided to minimize heat dissipation, increase efficiency, and enhance reliability. The output driver is clamped by an internal 17V Zener diode to protect power MOSFET transistors against undesired over-voltage gate signals ...

Page 9

... 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/ © 2008 Fairchild Semiconductor Corporation SG6860 • Rev. 1.0 ...

Page 10

... 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/ © 2008 Fairchild Semiconductor Corporation SG6860 • Rev. 1.0.1 (Continued ...

Page 11

... Fairchild Semiconductor Corporation SG6860 • Rev. 1.0.1 11 www.fairchildsemi.com ...

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