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PDF SG6859 Data sheet ( Hoja de datos )
| Número de pieza | SG6859 | |
| Descripción | Low Cost Green-Mode PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Product Specification
Low Cost Green-Mode PWM Controller for Flyback Converters
www.DataSheet4U.com
SG6859
FEATURES
Green-Mode PWM
Supports the “Blue Angel” Standard
Low Start-up Current (9uA)
Low Operating Current (3mA)
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 with Frequency
Hopping
VDD Over Voltage Protection (Auto Restart)
Gate Output Voltage Clamped at 17V
Low Cost
Few External Components Required
Small SOT-26 and Dip 8 Packages
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 9uA, and the operating current to
3mA. 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 SG6859’s output
driver is clamped at 17V. SG6859 controllers can be used
to improve the performance and reduce the production
cost of power supplies. The SG6859 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 1.2.1(IAO33.0067.B2)
SG6859
- 1 - www.sg.com.tw • www.fairchildsemi.com
September 28,2007
1 page  
Low Cost Green-Mode PWM Controller for Flyback Converters
www.DataSheet4U.com
Feedback Input Section
Symbol Parameter
ZFB Input Impedance
VFB-OPEN
VFB-OL
tD-OLP
VFB-N
VFB-G
SG
FB Output High Voltage
FB Open-loop Trigger Level
The delay time of FB pin Open Loop Protection
Green-Mode Entry FB Voltage
Green-Mode Ending FB Voltage
Green-Mode Modulation Slope
Test Condition
RI=95KΩ
Current Sense Section
Symbol Parameter
ZSENSE
tPD
VSTHFL
VSTHVA
tLEB
DCYSAW
Input Impedance
Delay to Output
Flat Threshold Voltage for Current Limit
Valley Threshold Voltage for Current Limit
Leading-Edge Blanking Time
Duty Cycle of SAW Limit
Test Condition
Product Specification
SG6859
Min.
5
4.3
2.6
40
Typ.
5
4.6
56
2.85
2.20
75
Max.
4.9
3.1
100
Unit
KΩ
V
V
ms
V
V
Hz/mV
Min.
10
40
0.91
0.75
250
Typ.
55
0.96
0.80
300
40
Max.
100
1.01
0.85
350
Unit
KΩ
ns
V
V
ns
%
Oscillator Section
Symbol Parameter
FOSC
Center Frequency
Normal PWM Frequency
Hopping Range
THOP
Hopping Period
FOSC-G
FDV
FDT
Green-Mode Frequency
Frequency Variation versus VDD Deviation
Frequency Variation versus Temp. Deviation
Test Condition
RI=95KΩ
RI=95KΩ
RI=95KΩ
VDD=13.5 to 22V
TA=-20 to 85°C
Min.
65
0
Typ.
70
±4.9
3.7
22
0.02
Max.
75
2
2
Unit
KHz
ms
KHz
%
%
Output Section
Symbol Parameter
DCYMAX
VGATE-L
Maximum Duty Cycle
Output Voltage Low
VGATE-H
Output Voltage High
tr Rising Time
tf Falling Time
VGATE-CLAMP
Output Clamp Voltage
Test Condition
VDD=15V, Io=20mA
VDD=13.5V, Io=20mA
VDD=15V, CL=1nF
VDD=15V, CL=1nF
VDD=22V
Min.
70
8
16
Typ.
75
150
55
17
Max.
80
1.5
18
Unit
%
V
V
ns
ns
V
© System General Corp.
Version 1.2.1(IAO33.0067.B2)
- 5 - www.sg.com.tw • www.fairchildsemi.com
September 28, 2007
5 Page 
Low Cost Green-Mode PWM Controller for Flyback Converters
www.DataSheet4U.com
PACKAGE INFORMATION
8 PINS - DIP (D)
D
85
E
14
Product Specification
SG6859
Θ ¢X
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.
Typ.
0.015
0.125
0.355
0.245
0.115
0.335
0˚
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 1.2.1(IAO33.0067.B2)
- 11 -
www.sg.com.tw • www.fairchildsemi.com
September 28, 2007
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SG6859.PDF ] | |
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