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PDF SG6905 Data sheet ( Hoja de datos )
| Número de pieza | SG6905 | |
| Descripción | Green mode PFC/Flyback-PWM Controller | |
| Fabricantes | System General | |
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Hay una vista previa y un enlace de descarga de SG6905 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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Green mode PFC/Flyback-PWM Controller
www.DataSheet4U.com
FEATURES
Interleaved PFC/PWM switching
Green mode PWM operation
Low start-up and operating current
Innovative switching charge multiplier-divider
Multi-vector control for improved PFC output
transient response
Average-current-mode control for PFC
PFC over-voltage and under-voltage protections
PFC remote on/off Control
PFC and PWM feedback open-loop protection
Cycle-by-cycle current limiting for PFC/PWM
Slope compensation for PWM
Constant power limit for PWM
Power-on sequence control
Brownout protection
Over temperature protection
APPLICATIONS
Switching Power Suppliers with Active PFC
High-Power Adaptors
DESCRIPTION
The highly integrated SG6905 is specially designed for
power supplies with boost PFC and flyback PWM. It
requires very few external components to
Product Specification
SG6905
achieve versatile protections. It is available in a 20-pin
SOP package.
The patented interleave-switching feature synchronizes
the PFC and PWM stages and reduces switching noise.
For PFC stage, the proprietary multi-vector control
scheme provides a fast transient response in a
low-bandwidth PFC loop, in which the overshoot and
undershoot of the PFC voltage are clamped. If the
feedback loop is broken, the SG6905 will shut off PFC to
prevent extra-high voltage on output.
For the flyback PWM, the synchronized slope
compensation ensures the stability of the current loop
under continuous-conduction-mode operation. Built-in
line-voltage compensation maintains constant
output-power limit. Hiccup operation during output
overloading is also guaranteed.
During start-up, the RDY pin will be pulled low until the
PFC output voltage reaches to the setting level. This
signal can be used to control the second power stage for
proper power on sequence.
SG6905 provides complete protection functions such as
brownout protection and RI pin open/short.
TYPICAL APPLICATION
© System General Corp.
Version 1.1.1 (IAO33.0060.B1)
- 1 - www.sg.com.t w • www.fairchildsemi.com
September 27, 2007
1 page  
Product Specification
Green mode PFC/Flyback-PWM Controller
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter
Value
VVDD
DC Supply Voltage*
25
IAC Input AC Current
2
VHigh
OPWM, OPFC, IAC
-0.3 to +25
VLow
Others
-0.3 to +7
PD Power Dissipation At TA < 50°C
0.8
TJ Operating Junction Temperature
-40 to +125
TSTG
Storage Temperature Range
-55 to +150
Rθj-C
Thermal resistance (Junction to Case)
23.64
TL Lead Temperature (Wave soldering or IR, 10 seconds)
260
VESD,HBM
ESD capability, HBM model
4.5
VESD,MM
ESD capability, Machine model
250
*All voltage values, except differential voltages, are given with respect to GND pin.
*Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
SG6905
Unit
V
mA
V
V
W
°C
°C
°C/W
°C
KV
V
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
TA Operating Ambient Temperature*
*For proper operation
Value
-20 to +85
Unit
°C
ELECTRICAL CHARACTERISTICS (VDD=15V, TA=25°C UNLESS NOTED)
VDD section
Symbol Parameter
VDD-OP
IDD-ST
IDD-OP
Continuously Operating Voltage
Start-up Current
Operating Current
VDD-ON
VDD-OFF
VDD-OVP
tD-VDDOVP
VDD-TH-G
Start Threshold Voltage
Min. Operating Voltage
VDD OVP Threshold
Debounce Time of VDD OVP
VDD Low-Threshold Voltage to Exit
Green-OFF Mode
Test Conditions
VDD-ON-0.16V
VDD= 15V; RI= 24KΩ
OPFC, OPWM open
RI= 24KΩ
Min. Typ.
10
6
15
9
23.5
8
VDD-OFF
+0.9
16
10
24.5
VDD-OFF
+1.5
Max.
20
25
10
17
11
25.5
25
VDD-OFF
+2.1
Unit
V
µA
mA
V
V
V
µs
V
© System General Corp.
Version 1.1.1 (IAO33.0060.B1)
- 5 - www.sg.com.t w • www.fairchildsemi.com
September 27, 2007
5 Page 
Green mode PFC/Flyback-PWM Controller
www.DataSheet4U.com
P FC Over V oltage P rotection on FBP FC
(OV P F BPF C ) vs Temperature
3.30
3.28
3.26
3.24
3.22
3.20
-40 -25 -10 5 20 35 50 65 80 95 110 125
Te m pe ra ture ( )
Product Specification
SG6905
Rising Time (tR -PF C ) vs Temperature
120
104
88
72
56
40
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature ( )
2.75
T hreshold Voltage of F BPF C for R DY high impedance
( VFB-RDY -H I GH ) vs T emperature
2.73
2.71
2.69
2.67
2.65
-40 -25 -10 5 20 35 50 65 80 95 110 125
Te m pe ra ture ( )
Falling Time (tF -PF C ) vs Temperature
110
96
82
68
54
40
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature ( )
Reference V oltage (V R EF ) vs Temperature
3.05
3.03
3.01
2.99
2.97
2.95
-40 -25 -10
5 20 35 50 65 80
Temperature ( )
95 110 125
Ma xim um D uty C ycle (D C YM AX) vs Te m pe ra ture
98
97
96
95
94
93
-40 -25 -10 5 20 35 50 65 80 95 110 125
Te m pe ra ture ( )
© System General Corp.
Version 1.1.1 (IAO33.0060.B1)
- 11 -
www.sg.com.t w • www.fairchildsemi.com
September 27, 2007
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet SG6905.PDF ] | |
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