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PDF SG6901A Data sheet ( Hoja de datos )
| Número de pieza | SG6901A | |
| Descripción | PFC / Flyback PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SG6901A (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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PFC / Flyback PWM Controller
www.DataSheet4U.com
FEATURES OVERVIEW
Interleaved PFC/PWM switching
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
Programmable two-level PFC output voltage
PFC over-voltage and under-voltage protections
PFC and PWM feedback open-loop protection
Cycle-by-cycle current limiting for PFC/PWM
Slope compensation for PWM
Constant power limit for PWM
Brownout protection
Over-temperature protection (OTP)
APPLICATIONS
Switching Power Supplies with Active PFC and
Standby Power
High-Power Adaptors
DESCRIPTION
The highly integrated SG6901A is designed for power
supplies with boost PFC and flyback PWM. It requires
Product Specification
SG6901A
very few external components to 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 SG6901A shuts off PFC to
prevent extra-high voltage on output. Programmable
two-level output voltage control reduces the PFC output
voltage at low line input to increase the efficiency of the
power supply.
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.
In addition, SG6901A provides protection functions, such
as brownout and RI pin open/short protection.
Typical Application
© System General Corp.
Version 1.0.1 (IAO33.0062.B0)
- 1 - www.sg.com.tw • www.fairchildsemi.com
September 26, 2007
1 page  
Product Specification
PFC / Flyback PWM Controller
SG6901A
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter
VVDD
IAC
VHigh
VLow
PD
TJ
TSTG
RθJC
DC Supply Voltage*
Input AC Current
OPWM, OPFC, IAC
Others
Power Dissipation at TA < 50°C
Operating Junction Temperature
Storage Temperature Range
Thermal Resistance (Junction-to-Case)
Value
25
2
-0.3 to +25.0
-0.3 to +7.0
1.15
-40 to +125
-55 to +150
23.64
TL Lead Temperature (Wave Soldering or Infrared, 10 Seconds)
260
VESD,HBM
Electrostatic Discharge Capability, Human Body Model
4.5
VESD,MM
Electrostatic Discharge 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.
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 otherwise noted.
VDD Section
Symbol Parameter
VDD-OP
IDD-ST
Continuously Operating Voltage
Start-up Current
IDD-OP
Operating Current
VDD-ON
VDD-OFF
VDD-OVP
tD-VDDOVP
Start Threshold Voltage
Minimum Operating Voltage
VDD OVP Threshold
Debounce Time of VDD OVP
Oscillator Section
Symbol Parameter
FOSC
RI
RIOPEN
RISHORT
PWM Frequency
RI Pin Resistance Range
RI Pin Open Protection
If RI > RIopen , SG6901A Turns Off
RI Pin Short Protection
If RI < RIshort , SG6901A Turns Off
© System General Corp.
Version 1.0.1 (IAO33.0062.B0)
Test Conditions
Min.
0V < VDD < VDD-ON
VDD=15V; OPFC, OPWM open;
RI=24KΩ
11
9
23.5
8
Typ.
10
6
12
10
24.5
Max.
20
25
10
13
11
25.5
25
Unit
V
µA
mA
V
V
V
µs
Test Conditions
RI=24KΩ
Min.
62
15.6
Typ.
65
200
Max.
68
47.0
Unit
KHz
KΩ
KΩ
2 KΩ
- 5 - www.sg.com.tw • www.fairchildsemi.com
September 26, 2007
5 Page 
PFC / Flyback PWM Controller
www.DataSheet4U.com
Maximum Duty C ycle (DC YMAX) vs Temperature
98
97
96
95
94
93
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (℃)
Product Specification
SG6901A
P eak Current Limit Thres hold V oltage 1 (VLIMIT -1)
0.75 vs Temperature
0.73
0.71
0.69
0.67
0.65
-40 -25 -10
5 20 35 50 65 80
Temperature (℃)
95 110 125
P WM Open Loop P rotection Voltage (F BOPE N-LOOP)
vs Temperature
4.80
4.68
4.56
4.44
4.32
4.20
-40 -25 -10
5 20 35 50 65 80
Temperature (℃)
95 110 125
Peak C urrent Limit Threshold Voltage 2 (VLIMIT-2) vs
0.70 Temperature
0.68
0.66
0.64
0.62
0.60
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (℃)
PWM Open Loop Protection Delay Time (tOPEN-PWM ) vs
70 Tem perature
65
60
55
50
45
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (℃)
Ris ing Time (tR -PWM) vs Temperature
120
102
84
66
48
30
-40 -25 -10
5 20 35 50 65 80
Temperature (℃)
95 110 125
© System General Corp.
Version 1.0.1 (IAO33.0062.B0)
- 11 -
www.sg.com.tw • www.fairchildsemi.com
September 26, 2007
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SG6901A.PDF ] | |
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