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PDF SG6742 Data sheet ( Hoja de datos )
| Número de pieza | SG6742 | |
| Descripción | Highly-Integrated Green-Mode PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Highly Integrated Green-Mode PWM Controller
FEATURES
High-voltage start-up
Low operating current (4mA)
Linearly decreasing PWM frequency to 22KHz
Frequency jittering to reduce EMI emission
Fixed PWM frequency (65KHz)
Peak-current-mode control
Cycle-by-cycle current limiting
Leading-edge blanking
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 (RT)
Internal latch circuit (OVP, RT)
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 SG6742 series of PWM controllers
www.DataShepert4oUvi.cdoems several features to enhance the performance of
flyback converters.
Product Specification
SG6742
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 start-up circuitry, the power loss due
to bleeding resistors is eliminated. To further reduce power
consumption, SG6742 is manufactured using the BiCMOS
process, which allows an operating current of 4mA.
SG6742 integrates a frequency a hopping function that
helps reduce EMI emission of a power supply with
minimum line filters. Also, 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 voltages,
from 90VAC to 264VAC.
SG6742 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 about
26V, the internal OVP circuit is triggered.
SG6742 is available in an 8-pin DIP or SOP package.
TYPICAL APPLICATION
© System General Corp.
Version 1.0.1 (IAO33.0083.B0)
- 1 - www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
1 page  
Highly Integrated Green-Mode PWM Controller
Oscillator Section
Symbol Parameter
FOSC
Frequency in Nominal Mode
tHOP
FOSC-G
FDV
FDT
Hopping Period
Green-Mode Frequency
Frequency Variation vs. VDD Deviation
Frequency Variation vs. Temp. Deviation
* Hopping off at green-mode.
Test Condition
Center Frequency
Hopping Range
VDD=11V to 22V
TA=-20 to 85°C
Feedback Input Section
Symbol Parameter
AV
ZFB
VFB-OPEN
VFB-OLP
tD-OLP
VFB-N
VFB-G
Input Voltage to Current-Sense Attenuation
Input Impedance
Output High Voltage
FB Open-Loop Trigger Level
Delay Time of FB Pin Open Loop Protection
Green-Mode Entry FB Voltage
Green-Mode Ending FB Voltage
Test Condition
FB pin open
Product Specification
SG6742
Min.
62
±3.7
18
Typ.
65
±4.2
4.4
22
Max.
68
±4.7
25
5
5
Unit
KHz
ms
KHz
%
%
Min.
1/4.5
4
5.5
5.0
53
1.9
Typ.
1/4.0
Max.
1/3.5
7
5.2
56
2.1
VFB-N-0.5
5.4
59
2.3
Unit
V/V
kΩ
V
V
ms
V
V
www.DataSheet4U.com
PWM Frequency
FOSC
FOSC-G
VFB-G
VFB-N
VFB
© System General Corp.
Version 1.0.1 (IAO33.0083.B0)
- 5 - www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
5 Page 
Highly Integrated Green-Mode PWM Controller
REFERENCE CIRCUIT (12V/5A)
Product Specification
SG6742
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
U1 SG6742
1 GND GATE
8
2 FB VDD 7
C12 3 NC SENSE 6
4 HV
RT 5
R4
1
+
C9
D3
2
1 Q2
R6 C10
THER1
R5
R7
R8
U2
VO+
R9
C11
R10
R
U3
R11
BOM
Reference
BD1
C1
C2
C3
www.DataSheCet44U.com
C5
C6
C7
C8
C9
C10
C11
C12
D1
D2
D3
D4
F1
L1
L2
L3
Component
BD 4A/600V
XC 0.68µF/300V
XC 0.1µF/300V
YC 222pF/Y1
EC 120µF/400V
CC 0.01µF/500V
CC 102pF/100V
EC 1000µF/25V
EC 470µF/25V
EC 22µF/50V
CC 470pF/50V
CC 222pF/50V
CC 103pF/50V
Zener Diode 15V 1/2W (option)
BYV95C
FR103
1N4007
FUSE 4A/250V
Inductor (900µH)
Inductor (2µH)
Inductor (900µH)
Reference
Q1
Q2
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
THER1
T1
T2
U1
U2
U3
VZ1
Component
STP20-100CT
MOS 7A/600V
R 100Kohm 1/2W
R 47ohm 1/4W
R 100Kohm 1/2W
R 20ohm 1/8W
R 100ohm 1/8W
R 4.7Kohm 1/8W
R 0.3ohm 2W
R 680ohm 1/8W
R 4.7Kohm 1/8W
R 150Kohm 1/8W
R 39Kohm 1/8W
Thermistor TTC104
10mH
600µH(PQ2620)
IC SG6742
IC PC817
IC TL431
VZ 9G
© System General Corp.
Version 1.0.1 (IAO33.0083.B0)
- 11 -
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SG6742.PDF ] | |
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