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PDF SG6203 Data sheet ( Hoja de datos )
| Número de pieza | SG6203 | |
| Descripción | Synchronous Rectifier Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Synchronous Rectifier Controller for Flyback Converter
Product Specification
SG6203
FEATURES
Low operation current (1.7mA)
One resistor for timing setting
Internal automatic tracking for optimum dead time
No reverse energy flow at light load
Best suited for primary green-mode PWM IC
Wide supply voltage range from 6V to 20V
Built-in 18V Zener diode
Optional current sensing:
- Current shunt
- RC network for better efficiency
APPLICATIONS
Flyback converters, such as:
Power adaptors
Open-frame SMPS
DESCRIPTION
The SG6203 is designed to control and drive the
synchronous rectifier for the flyback converter. The
synchronous signal of the primary switch is obtained by a
single diode connected between the transformer
secondary winding and the SG6203. Using the SG6203,
no additional transformer winding is required and the
circuit complexity can be minimized.
The power unit can be properly operated under
discontinuous conduction mode (DCM) or continuous
conduction mode (CCM). Problems such as
“shoot-through” or “cross conduction” in CCM and
energy-reverse from the secondary to the primary in DCM
are prevented by the SG6203 design.
TYPICAL APPLICATION
www.DataSheet4U.com
© System General Corp.
Version 1.0.1 (IAO33.0010.B1)
- 1 - www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
1 page  
Synchronous Rectifier Controller for Flyback Converter
Synchronous Detection Section
Symbol Parameter
Test Condition
VTH Threshold Voltage to Enable One-shot Signal
VTL Threshold Voltage to Enable Output
IN+ - IN- > 5mV
IDET Current Output from DET Pin
RT=24KΩ
TD_LOW
Debounce Time from DET Low to Enable Output
Product Specification
SG6203
Min.
1.9
1.2
150
Typ.
2.1
1.4
250
Max.
2.3
1.6
300
300
Unit
V
V
µA
ns
Current Detection Section
Symbol Parameter
VOFFSET
Offset Voltage
IIN+ Current Output from IN+
Test Condition
RT=24KΩ
Min.
90
IIN- Current Output from IN-
RT=24KΩ
90
IIN+ - IIN-
TP
PSRR
CMRR
CMRR-f
Differential Current of IN+ and IN-
Propagation Delay (OUTPUT from Low to High)
Power Supply Rejection Ratio
Common Mode Rejection Ratio
Common Mode Rejection Ratio at 70KHz
12KΩ < RT < 36KΩ
DET< VTL, IN+ - IN- > 5mV
Typ.
100
100
65
65
32
Max.
10
110
110
1.5
200
Unit
mV
µA
µA
µA
ns
dB
dB
dB
Zener Section
Symbol Parameter
VZ Zener Voltage
Test Condition
IVZ=0.1 ~ 3mA
Min.
18
Typ.
19
Max.
20
Unit
V
Output Section
Symbol Parameter
www.DataSheVetO4HU.com Output Voltage High
VOL Output Voltage Low
Tr Rising Time
Tf Falling Time
Test Condition
VCC=12V, ISOURCE=50mA
VCC=6V, ISOURCE=30mA
VCC=12V, ISINK=50mA
VCC=6V, ISINK=30mA
TA=25°C; CL=5nF,
VCC=12V
TA=25°C; CL=5nF,
VCC=12V
Min.
11.2
3.5
Typ.
150
150
Max.
1
1.2
175
Unit
V
V
V
V
ns
175 ns
VCC Section
Symbol Parameter
VOP Continuously Operating Voltage
ICC_OP
Operating Current
VTH(ON)
VTH(OFF)
Start Threshold
Minimum Operating Voltage
Test Condition
Min.
VDD=12V, Output=open,
DET=50KHz,
IN-=IN+=open, RT=12KΩ
4.8
Typ.
1.7
6.0
5.1
Max.
20
Unit
V
4.0 mA
6.3 V
V
© System General Corp.
Version 1.0.1 (IAO33.0010.B1)
- 5 - www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
5 Page 
Synchronous Rectifier Controller for Flyback Converter
PACKAGE INFORMATION
8 PINS-SOP(S)
85
E
14
b
e
C
F
Product Specification
SG6203
D
A1 A
Θ
L
Dimensions
www.DataSheet4U.com
Symbol
A
A1
b
c
D
E
e
F
H
L
θ˚
Millimeter
Min.
1.346
0.101
4.648
3.810
1.016
5.791
0.406
0°
Typ.
0.406
0.203
1.270
0.381X45°
Max.
1.752
0.254
4.978
3.987
1.524
6.197
1.270
8°
Inch
Min.
0.053
0.004
0.183
0.150
0.040
0.228
0.016
0°
Typ.
0.016
0.008
0.050
0.015X45°
Max.
0.069
0.010
0.196
0.157
0.060
0.244
0.050
8°
© System General Corp.
Version 1.0.1 (IAO33.0010.B1)
- 11 -
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SG6203.PDF ] | |
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