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PDF SG5701 Data sheet ( Hoja de datos )
| Número de pieza | SG5701 | |
| Descripción | Low Cost Green-Mode PWM Controller | |
| Fabricantes | System General | |
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Low Cost Green-Mode PWM Controller for Flyback Converters
Product Specification
SG5701
FEATURES
Green-Mode PWM
Supports the “Blue Angel” Standard
Low Start-up Current (10uA)
Low Operating Current (2mA)
Leading-Edge Blanking
Constant Output Power Limit
Universal Input
Built-in Synchronized Slope Compensation
Current Mode Operation
Cycle-by-cycle Current Limiting
Under Voltage Lockout (UVLO)
Programmable PWM Frequency
Gate Output Voltage Clamped at 17V
Low Cost
Few External Components Required
Small SOT-26 Package
APPLICATIONS
General-purpose switching mode power supplies and
flyback power converters, such as
Battery chargers for cellular phones, cordless phones,
PDAs, digital cameras, and power tools
Power adapters for ink jet printers, video game
consoles, and portable audio players
Open-frame SMPS for TV/DVD standby and other
auxiliary supplies, home appliances, and consumer
electronics
Replacements for linear transformers and RCC
SMPS
PC 5V standby power.
DESCRIPTION
This highly-integrated PWM controller provides
several special enhancements designed to meet the low
standby-power needs of low-power SMPS. To minimize
standby power consumption, the proprietary green-mode
function provides off-time modulation to linearly
decrease the switching frequency under light-load
conditions. This green-mode function enables the power
supply to easily meet even the strictest power
conservation requirements.
The BiCMOS fabrication process enables reducing
the start-up current to 10uA, and the operating current to
2mA. To further improve power conservation, a large
start-up resistance can be used. Built-in synchronized
slope compensation ensures the stability of peak current
mode control. Proprietary internal compensation provides
a constant output power limit over a universal AC input
range (90VAC to 264VAC). Pulse-by-pulse current
limiting ensures safe operation even during short-circuits.
To protect the external power MOSFET from being
damaged by supply over voltage, the SG5701’s output
driver is clamped at 17V. SG5701 controllers can be used
to improve the performance and reduce the production
cost of power supplies. The SG5701 is the best choice for
replacing linear and RCC-mode power adapters. It is
available in 8-pin DIP and 6-pin SOT-26 packages.
TYPICAL APPLICATION
© System General Corp.
Version 1.0(IAO33.0025.B1)
-1-
www.sg.com.tw
Mar. 28, 2006
1 page  
Low Cost Green-Mode PWM Controller for Flyback Converters
Product Specification
SG5701
Current Sense Section
Symbol Parameter
ZCS
TPD
VTH,FLT
VTH,VALLEY
Input Impedance
Delay to Output
Current Limit Flatten Threshold Voltage
Current Limit Valley Threshold Voltage
Test Condition
Min.
10
0.80
Typ.
60
1.0
0.85
Max.
100
0.90
Unit
kΩ
nsec
V
V
Oscillator Section
Symbol Parameter
FOSC
FOSC-GREEN
IG
IN
SG
FDY
FDT
Frequency
Green-Mode Frequency
Green-Mode FB Input Current
Green-Mode Start Threshold FB Input Current
In = 0.3mA for a Maximum Duty Cycle
Green-Mode Modulation Slope
Frequency Variation versus VDD Deviation
Frequency Variation versus Temp. Deviation
Test Condition
RI=95kΩ
RI=95kΩ
RI=95kΩ
VDD=12 to 20V
TA=-30 to 105 ℃
PWM Section
Symbol Parameter
DC (MAX)
DC (MIN)
BNK
Maximum Duty Cycle
Minimum Duty Cycle
Leading-Edge Blanking Time
Test Condition
Min.
65
Typ.
70
13
1.05
0.85
300
0.02
Max.
75
15
2
2
Unit
kHz
kHz
mA
mA
Hz/uA
%
%
Min.
70
-
Typ.
75
1
200
Max.
80
2
Unit
%
%
nsec
Output Section
Symbol Parameter
VOL Output Voltage Low
VOH Output Voltage High
TR Rising Time
TF Falling Time
VCLAMP
Output Clamp Voltage
Test Condition
VDD=15V, Io=20mA
VDD=15V, Io=20mA
VDD=15V, CL=1nF
VDD=15V, CL=1nF
VDD=20V
Min.
8
16
Typ.
250
60
17
Max.
1.5
350
150
18
Unit
V
V
nsec
nsec
V
© System General Corp.
Version 1.0(IAO33.0025.B1)
-5-
www.sg.com.tw
Mar. 28, 2006
5 Page 
Low Cost Green-Mode PWM Controller for Flyback Converters
PACKAGE INFORMATION
8 PINS -- DIP (D)
D
85
E
14
Product Specification
SG5701
Θ°
eB
L
b1
e
b
Dimensions
Symbol
A
A1
A2
b
b1
D
E
E1
e
L
eB
θ˚
Millimeters
Min. Typ.
0.381
3.175
9.017
6.223
2.921
8.509
0˚
3.302
1.524
0.457
9.271
7.620
6.350
2.540
3.302
9.017
7˚
Max.
5.334
3.429
10.160
6.477
3.810
9.525
15˚
Inches
Min.
0.015
0.125
0.355
0.245
0.115
0.335
0˚
Typ.
0.130
0.060
0.018
0.365
0.300
0.250
0.100
0.130
0.355
7˚
Max.
0.210
0.135
0.400
0.255
0.150
0.375
15˚
© System General Corp.
Version 1.0(IAO33.0025.B1)
- 11 -
www.sg.com.tw
Mar. 28, 2006
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SG5701.PDF ] | |
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