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PDF SG6860 Data sheet ( Hoja de datos )
| Número de pieza | SG6860 | |
| Descripción | Green-Mode PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
March 2008
SG6860
Low-Cost, Green-Mode PWM Controller for
Flyback Converters
Features
Green-Mode PWM
Supports the “Blue Angel” Eco Standard
Low Start-up Current: 9µA
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 (Latch off)
Gate Output Voltage Clamped at 17V
Low Cost
Few External Components Required
Small SOT-26 Package
Applications
Power Adaptors
Open-Frame SMPS
Description
This highly integrated PWM controller provides several
enhancements designed to meet the low standby-power
needs of low-power SMPS. To minimize standby power
consumption, a 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 meet
even strict power conservation requirements.
The BiCMOS fabrication process enables reducing the
start-up current to 9µA 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 SG6860’s output
driver is clamped at 17V. SG6860 controllers can
improve the performance and reduce the production
cost of power supplies. The SG6860 can replace linear
and RCC-mode power adapters. It is available in 8-pin
DIP and 6-pin SOT-26 packages.
Ordering Information
Part Number
SG6860TZ
SG6860DZ
Operating Temperature Range
Package
-40°C to +85°C
Small SOT-26 Package
-40°C to +85°C
8-pin Dual in-line Package (DIP)
Packing Method
Tape & Reel
Rail
All packages are lead free per JEDEC: J-STD-020B standard.
© 2008 Fairchild Semiconductor Corporation
SG6860 • Rev. 1.0.1
www.fairchildsemi.com
1 page  
Electrical Characteristics
wwwV.DDaDt=aS15heVe,t4TUA=.co2m5°C, unless noted operating specs.
Symbol
Parameter
VDD Section
VDD-OP Continuous Operation Voltage
VDD-ON Turn-on Threshold Voltage
VDD-OFF Turn-off Threshold Voltage
IDD-ST Start-up Current
IDD-OP Operating Supply Current
VDD-OVP
tD-VDDOVP
IDD-H
VDD Over-voltage Protection Level
VDD Over-voltage Protection Debounce
Holding Current after OVP Latch-off
Feedback Input Section
ZFB
VFB-OPEN
VFB-OL
tD-OLP
VFB-N
VFB-G
SG
Input Impedance
FB Output High Voltage
FB Open-loop Trigger Level
Delay Time of FB Pin Open-loop Protection
Green-Mode Entry FB Voltage
Green-Mode Ending FB Voltage
Green-Mode Modulation Slope
Current-Sense Section
ZSENSE Input Impedance
tPD Delay to Output
VSTHFL Flat Threshold Voltage for Current Limit
VSTHVA Valley Threshold Voltage for Current Limit
tLEB Leading-Edge Blanking Time
DCYSAW Duty Cycle of SAW Limit
Oscillator Section
fOSC
Center Frequency
Hopping Range
tHOP Hopping Period
fOSC-G Green-Mode Frequency
fDV Frequency Variation vs. VDD Deviation
fDT
Frequency Variation vs. Temperature
Deviation
Output Section
DCYMAX Maximum Duty Cycle
VGATE-L Output Voltage Low
VGATE-H Output Voltage High
tr Rising Time
tf Falling Time
VGATE-
CLAMP
Output Clamp Voltage
Conditions
Min. Typ. Max. Units
VDD=VDD-ON – 0.1V
VDD=15V, GATE with
1nF to GND
Latch off
Latch off
VDD=5V
15.5
8.5
24
40
16.5
9.5
9
3.0
25
120
50
22
17.5
10.5
15
3.5
26
60
V
V
V
µA
mA
V
µs
µA
RI=95KΩ
5 KΩ
5V
4.7 V
54 ms
2.60 2.85 3.10
V
2.2 V
40 75 100 Hz/mV
10
40 55 100
1
0.65 0.70 0.75
250 300 350
Maximum Duty Cycle
40
KΩ
ns
V
V
ns
%
RI=95KΩ
RI=95KΩ
RI=95KΩ
VDD=13.5 to 22V
TA=-20 to 85°C
65 70 75 KHz
±4.9
3.7 ms
20 KHz
0
0.02 2.00
%
2%
VDD=15V, IO=20mA
VDD=13.5V, IO=20mA
VDD=15V, CL=1nF
VDD=15V, CL=1nF
VDD=22V
70
8
16
75 80
1.5
135
35
17 18
%
V
V
ns
ns
V
© 2008 Fairchild Semiconductor Corporation
SG6860 • Rev. 1.0.1
5
www.fairchildsemi.com
5 Page 
www.DataSheet4U.com
© 2008 Fairchild Semiconductor Corporation
SG6860 • Rev. 1.0.1
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SG6860.PDF ] | |
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