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What is SG6742HL?

This electronic component, produced by the manufacturer "Fairchild Semiconductor", performs the same function as "Highly Integrated Green-Mode PWM Controller".


SG6742HL Datasheet PDF - Fairchild Semiconductor

Part Number SG6742HL
Description Highly Integrated Green-Mode PWM Controller
Manufacturers Fairchild Semiconductor 
Logo Fairchild Semiconductor Logo 


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April 2009
SG6742HL/HR
Highly Integrated Green-Mode PWM Controller
Features
ƒ High-Voltage Startup
ƒ Low Operating Current: 2.7mA
ƒ Linearly Decreasing PWM Frequency to 22KHz
ƒ Frequency Hopping to Reduce EMI Emission
ƒ Fixed PWM Frequency: 100KHz
ƒ Peak-Current-Mode Control
ƒ Cycle-by-Cycle Current Limiting
ƒ Leading-Edge Blanking (LEB)
ƒ Synchronized Slope Compensation
ƒ Internal Open-Loop Protection
ƒ GATE Output Maximum Voltage Clamp: 18V
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ VDD Over-Voltage Protection (OVP)
ƒ Programmable Over-Temperature Protection (OTP)
ƒ Internal Latch Circuit (OVP, OTP)
ƒ Internal-Sense, Short-Circuit Protection
ƒ Built-in 6ms Soft-Start Function
ƒ Constant Power Limit (Full AC Input Range)
ƒ Internal OTP Sensor with Hysteresis
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
ƒ Power Adapters
ƒ Open-Frame SMPS
Description
The highly integrated SG6742HL/HR PWM controller
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 eliminated. To further
reduce power consumption, SG6742HL/HR is
manufactured using the BiCMOS process, which allows
an operating current of 2.7mA.
SG6742HL/HR integrates a frequency-hopping function
internally that helps reduce EMI emission of a power
supply with minimum line filters. Its built-in synchronized
slope compensation achieves stable peak-current-mode
control. The proprietary, internal line compensation
ensures constant output power limit over a wide AC
input voltage range, from 90VAC to 264VAC.
SG6742HL/HR provides many protection functions. In
addition to cycle-by-cycle current limiting, the internal
open-loop protection circuit ensures 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 starts up again. As long as VDD
exceeds ~25V, the internal OVP circuit is triggered.
SG6742HL/HR is available in an 8-pin SOP package.
Ordering Information
Part
Number
SG6742HLSY
SG6742HRSY
Operating
Temperature
Range
-40 to +105°C
-40 to +105°C
OLP
Function
Package
Eco Packing
Status Method
Latch 8-Lead Small Outline Package (SOP)
Restart 8-Lead Small Outline Package (SOP)
Green
Green
Tape & Reel
Tape & Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
SG6742HL/HR • Rev. 1.0.4
www.fairchildsemi.com
Free Datasheet http://www.nDatasheet.com

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SG6742HL equivalent
Electrical Characteristics
VDD=15V and TA=25°C unless otherwise noted.
Symbol
Parameter
Conditions
VDD Section
VOP
VDD-ON
VDD-OFF
IDD-ST
IDD-OP
IDD-OLP
VTH-OLP
VDD-OVP
tD-VDDOVP
Continuously Operating Voltage
Start Threshold Voltage
Minimum Operating Voltage
Startup Current
Operating Supply Current
Internal Sink Current
IDD-OLP off Voltage
VDD Over-Voltage Protection
VDD Over-Voltage Protection
Debounce Time
HV Section
VDD-ON – 0.16V
VDD=15V, GATE Open
VTH-OLP+0.1V
IHV Supply Current from HV Pin
IHV-LC Leakage Current After Startup
Oscillator Section
fOSC
tHOP
fOSC-G
fDV
fDT
Frequency in Normal Mode
Hopping Period
Green-Mode Frequency
Frequency Variation vs. VDD
Deviation
Frequency Variation vs.
Temperature Deviation
VAC=90V (VDC=120V),
VDD=0V
HV=500V, VDD=VDD-
OFF+1V
Center Frequency
Hopping Range
VDD=11V to 22V
TA=-40 to 105°C
PWM Frequency
fOSC
Min. Typ. Max. Units
22
14.5 15.5 16.5
8.5 9.5 10.5
30
2.7 3.7
30 60 90
6.5 7.5 8.0
24 25 26
75 125 200
V
V
V
µA
mA
µA
V
V
µs
1.75 2.30 3.35
1 20
mA
µA
90 100 110
KHz
±4.2 ±4.7 ±5.2
4.9 5.6 6.3 ms
18 22 25 KHz
5%
5%
Continued on the following page…
fOSC-G
VFB-ZDC VFB-G
VFB-N
Figure 5. VFB vs. PWM Frequency
VFB
© 2008 Fairchild Semiconductor Corporation
SG6742HL/HR • Rev. 1.0.4
5
www.fairchildsemi.com
Free Datasheet http://www.nDatasheet.com


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Featured Datasheets

Part NumberDescriptionMFRS
SG6742HLThe function is Highly Integrated Green-Mode PWM Controller. Fairchild SemiconductorFairchild Semiconductor
SG6742HRThe function is Highly Integrated Green-Mode PWM Controller. Fairchild SemiconductorFairchild Semiconductor

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