SG6741SY FAIRCHILD [Fairchild Semiconductor], SG6741SY Datasheet

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SG6741SY

Manufacturer Part Number
SG6741SY
Description
Highly Integrated Green-Mode PWM Controller
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
1.SG6741SY.pdf (12 pages)
© 2008 Fairchild Semiconductor Corporation
SG6741 • Rev. 1.3.3
SG6741
Highly Integrated Green-Mode PWM Controller
Features
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
Ordering Information
Part Number
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
SG6741SZ
SG6741SY
High-Voltage Startup
Low Operating Current: 4mA
Linearly Decreasing PWM Frequency to 22kHz
Frequency Hopping to Reduce EMI Emission
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Leading-Edge Blanking
Synchronized Slope Compensation
Gate Output Maximum Voltage Clamp: 18V
V
V
Internal Open-Loop Protection
Constant Power Limit (Full AC Input Range)
Power Adapters
Open-Frame SMPS
DD
DD
Over-Voltage Protection (Auto Restart)
Under-Voltage Lockout (UVLO)
Temperature
-40 to +105°C
-40 to +105°C
Operating
Range
8-Lead Small Outline Package (SOP)
8-Lead Small Outline Package (SOP)
Package
Description
The highly integrated SG6741 PWM controller provides
several features to enhance the performance of flyback
converters.
The
controllers provides several features to enhance the
performance of flyback 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 22KHz. 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, SG6741 is manufactured
using the BiCMOS process, which allows an operating
current of only 4mA.
SG6741 integrates a frequency-hopping function that
helps reduce EMI emission of a power supply with
minimum line filters. Its built-in synchronized slope
compensation
control. The proprietary internal line compensation
ensures constant output power limit over a wide range
of AC input voltages, from 90V
SG6741 provides many protection functions. In addition
to cycle-by-cycle current limiting, the internal open-loop
protection circuit ensures safety when an open-loop or
output short-circuit failure occurs. PWM output is
disabled until V
then the controller starts again. As long as V
about 26V, the internal OVP circuit is triggered.
SG6741 is available in an 8-pin SOP package.
1
highly
integrated
DD
achieves
drops below the UVLO lower limit;
Eco Status Packing Method
Green
Green
SG6741
stable
AC
to 264V
peak-current-mode
series
Tape & Reel
Tape & Reel
October 2008
AC
.
www.fairchildsemi.com
DD
of
exceeds
PWM

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SG6741SY Summary of contents

Page 1

... Operating Part Number Temperature Range SG6741SZ -40 to +105°C SG6741SY -40 to +105°C For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2008 Fairchild Semiconductor Corporation SG6741 • Rev. 1.3.3 Description The highly integrated SG6741 PWM controller provides several features to enhance the performance of flyback converters ...

Page 2

Application Diagram Internal Block Diagram © 2008 Fairchild Semiconductor Corporation SG6741 • Rev. 1.3.3 Figure 1. Typical Application Figure 2. Functional Block Diagram 2 www.fairchildsemi.com ...

Page 3

... Marking Information Marking for SG6741SZ Marking for SG6741SY Pin Configuration Pin Definitions Pin # Name Description 1 GND Ground. The signal from the external compensation circuit is fed into this pin. The PWM duty cycle determined in response to the signal on this pin and the current-sense signal on the SENSE pin. ...

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 V =15V, T =25°C, unless otherwise noted Symbol Parameter V Section DD V Continuously Operating Voltage OP V Start Threshold Voltage DD-ON V Minimum Operating Voltage DD-OFF I Startup Current DD-ST I Operating Supply Current DD-OP ...

Page 6

Electrical Characteristics V =15V, T =25°C, unless otherwise noted Symbol Parameter Feedback Input Section A Input Voltage to Current-Sense Attenuation V Z Input Impedance FB V Output High Voltage FB-OPEN V FB Open-Loop Trigger Level FB-OLP t Delay ...

Page 7

Typical Performance Characteristics Temperature (℃) Figure 6. Startup Current (I Start Threshold Voltage (V 20.0 19.0 18.0 17.0 16.0 15.0 -40 -25 - ...

Page 8

Functional Description Startup Current For startup, the HV pin is connected to the line input or bulk capacitor through an external resistor recommended as 100KΩ. Typical startup current drawn from pin HV is 2mA and it charges the ...

Page 9

Functional Description V Over-Voltage Protection (OVP over-voltage protection has been built in to prevent DD damage due to abnormal conditions. Once the V voltage is over the V over-voltage protection voltage and lasts for t ...

Page 10

Applications Information CN1 CN1 GND 2 FB C12 BOM Designator BD1 BD 4A/600V C1 XC 0.68µF/300V C2 XC 0.1µF/300V C3 YC 2200pF/ 120µF/400V C5 CC ...

Page 11

Physical Dimensions 5.00 4.80 3.81 8 6.20 5.80 1 PIN ONE INDICATOR (0.33) 0.25 0.10 1.75 MAX R0.10 R0.10 8° 0° 0.90 0.406 DETAIL A SCALE: 2:1 Package drawings are provided as a service to customers considering Fairchild components. Drawings ...

Page 12

Fairchild Semiconductor Corporation SG6741 • Rev. 1.3.3 12 www.fairchildsemi.com ...

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