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Fairchild Semiconductor Electronic Components Datasheet

FAN6791 Datasheet

(FAN6791 / FAN6793) Dual-PWM Combination Controller

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April 2009
FAN6791 / FAN6793
Highly Integrated, Dual-PWM Combination Controller
Features
ƒ High-Voltage Startup
ƒ Low Operating Current
ƒ Interleaved Stand-by PWM / Forward PWM Switching
ƒ Green Mode Stand-by PWM / Forward PWM
ƒ Linearly Decreasing Stand-by PWM Frequency to
20kHz
ƒ Remote On / Off
ƒ AC Brownout Protection
ƒ Forward PWM with Soft-Start
ƒ Frequency Hopping to Reduce EMI Emissions
ƒ Cycle-by-Cycle Current Limiting for Stand-by PWM /
Forward PWM
ƒ Leading-Edge Blanking for Stand-by PWM / Forward
PWM
ƒ Synchronized Slope Compensation for Stand-by
www.DataSheePt4WUM.co/mForward PWM
ƒ GATE Output Maximum Voltage Clamp
ƒ VDD Over-Voltage Protection (OVP)
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ Internal Open-Loop Protection for Stand-by PWM /
Forward PWM
ƒ Constant Power Limit for Stand-by PWM / Forward
PWM
Description
The highly integrated FAN6791/3 dual PWM
combination controller provides several features to
enhance the performance of converters.
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
linearly decrease the switching frequency at light-load
conditions. To avoid acoustic-noise problems, the
minimum PWM frequency is set above 20KHz. This
green-mode function enables the power supply to meet
international power conservation requirements. With the
internal high-voltage startup circuitry, the power loss
due to bleeding resistors is also eliminated. To further
reduce power consumption, FAN6791/3 is
manufactured using the CMOS process, which allows
an operating current of only 6mA.
FAN6791/3 integrates a frequency-jittering function
internally to reduce EMI emissions of a power supply
with minimum line filters. The built-in synchronized slope
compensation achieves stable peak-current-mode
control. The proprietary internal line compensation
ensures constant output power limit.
FAN6791/3 provides many protection functions,
including brownout protection, cycle-by-cycle current
limiting, and an internal open-loop protection circuit to
ensure safety should an open-loop or output short-
circuit failure occur. PWM output is disabled until VDD
drops below the UVLO lower limit when the controller
restarts. As long as VDD exceeds ~24.5V, the internal
OVP circuit is triggered.
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
ƒ PC-ATX Power Supplies
© 2008 Fairchild Semiconductor Corporation
FAN6791 / FAN6793 • Rev. 1.0.2
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FAN6791 Datasheet

(FAN6791 / FAN6793) Dual-PWM Combination Controller

No Preview Available !

Ordering Information
Part OPWM
Operating
Number Maximum Duty Temperature Range
FAN6791NY
48%
-40°C to +105°C
FAN6793NY
65%
-40°C to +105°C
FAN6791MY
48%
-40°C to +105°C
FAN6793MY
65%
-40°C to +105°C
Eco Status
Package
Green
Green
Green
Green
16-pin Dual In-Line
Package (DIP)
16-pin Dual In-Line
Package (DIP))
16-pin Small Out-Line
Package (SOP)
16-pin Small Out-Line
Package (SOP)
Packing
Method
Tube
Tube
Tape & Reel
Tape & Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
Application Diagram
www.DataSheet4U.com
© 2008 Fairchild Semiconductor Corporation
FAN6791 / FAN6793 • Rev. 1.0.2
Figure 1. Typical Application
2
www.fairchildsemi.com


Part Number FAN6791
Description (FAN6791 / FAN6793) Dual-PWM Combination Controller
Maker Fairchild Semiconductor
Total Page 19 Pages
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1 FAN6791 (FAN6791 / FAN6793) Dual-PWM Combination Controller
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