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PDF SG6742HR Data sheet ( Hoja de datos )
| Número de pieza | SG6742HR | |
| Descripción | Highly Integrated Green-Mode PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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April 2009
SG6742HL/HR
Highly Integrated Green-Mode PWM Controller
Features
High-Voltage Startup
Low Operating Current: 2.7mA
Linearly Decreasing PWM Frequency to 22KHz
Frequency Hopping to Reduce EMI Emission
Fixed PWM Frequency: 100KHz
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Leading-Edge Blanking (LEB)
Synchronized Slope Compensation
Internal Open-Loop Protection
GATE Output Maximum Voltage Clamp: 18V
VDD Under-Voltage Lockout (UVLO)
VDD Over-Voltage Protection (OVP)
Programmable Over-Temperature Protection (OTP)
Internal Latch Circuit (OVP, OTP)
Internal-Sense, Short-Circuit Protection
Built-in 6ms Soft-Start Function
Constant Power Limit (Full AC Input Range)
Internal OTP Sensor with Hysteresis
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
Power Adapters
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
1 page  
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
5 Page 
Applications Information
F1
CN1
1
2
3
CN1
L1
T1
C1
VZ1
C2 4
C3
D4
BD1
1
+
C4
C5 R1
D2
4 T2 8
5
6
2
37
R2
1
3
Q1
C6
2
1 L2 2
VO+
++
C7 C8
L3
VO+
D1
VO-
R3
R4
Q2
1
D3
12
U1 SG6742MR
1 GND GATE 8
+
C9
2 FB VDD 7
C12
3 NC SENSE 6
4 HV
RT 5
R6
R5
C10
THER1
R7
R8
U2
VO+
R9
C11
R10
R
U3
R11
BOM
Designator
BD1
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
D1
D2
D3
D4
F1
L1
L2
Figure 21. 60W Flyback 12V/5A Application Circuit
Part Type
BD 4A/600V
XC 0.68µF/300V
XC 0.1µF/300V
YC 2200pF/Y1
EC 120µF/400V
CC 0.01µF/500V
CC 1000pF/100V
EC 1000µF/25V
EC 470µF/25V
EC 22µF/50V
CC 47pF/50V
CC 2200pF/50V
CC 0.01µF/50V
Zener Diode 15V 1/2W (option)
BYV95C
FR103
1N4007
FUSE 4A/250V
Inductor (900µH)
Inductor (2µH)
Designator
L3
Q1
Q2
R1
R2
R3
R4
R5
R6, R9
R7
R8
R10
R11
THER1
T1
T2
U1
U2
U3
VZ1
Part Type
Inductor (900µH)
STP20-100CT
MOS 7A/600V
R 100KΩ 1/2W
R 47Ω 1/4W
R 100KΩ 1/2W
R 4.7Ω 1/8W
R 100Ω 1/8W
R 4.7KΩ 1/8W
R 0.3Ω 2W
R 680Ω 1/8W
R 150KΩ 1/8W
R 39KΩ 1/8W
Thermistor TTC104
10mH
255µH(PQ2620)
IC SG6742
IC PC817
IC TL431
VZ 9G
© 2008 Fairchild Semiconductor Corporation
SG6742HL/HR • Rev. 1.0.4
11
www.fairchildsemi.com
Free Datasheet http://www.nDatasheet.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SG6742HR.PDF ] | |
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