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PDF SG6842J Data sheet ( Hoja de datos )
| Número de pieza | SG6842J | |
| Descripción | Highly-Integrated Green-Mode PWM Controller | |
| Fabricantes | System General | |
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Highly-Integrated Green-Mode PWM Controller
FEATURES
Green-mode PWM Controller
Low Start-Up Current (8uA)
Low Operating Current (4mA)
Programmable PWM frequency with Jittering
Peak-current-mode Operation
Cycle-by-Cycle Current Limiting
Synchronized Slope Compensation
Leading-Edge Blanking
Constant Output Power Limit (Full AC Input Range)
VDD Over Voltage Protection (OVP)
Programmable Over Temperature Protection (OTP)
Internal Latch Circuit (OTP, OVP) Options
Internal Open-loop Protection
APPLICATIONS
General-purpose sw itch m ode pow er supp lies an d
flyback power converters, including:
Notebook Power Adapters
Open-Frame SMPS
DESCRIPTION
The hi ghly i ntegrated S G6842J se ries of P WM
controllers provides se veral feat ures t o enhance t he
performance of flyback converters.
To m inimize standby p ower co nsumption, a
proprietary green-mode fun ction pro vides of f-time
modulation t o co ntinuously dec rease t he swi tching
TYPICAL APPLICATION
Product Specification
SG6842J
frequency at l ight-load co nditions. To a void
acoustic-noise p roblem, t he m inimum PWM frequency
set abo ve 20kHz. T his green-mode f unction e nables t he
power supp ly to easily meet in ternational power
conservation r equirements. To further re duce p ower
consumption, SG 6842J is m anufactured by usi ng the
BiCMOS process. This allows the lowest start-up current
around 8uA, and the operating current is only 4mA. As a
result, large start-up resistance can be used.
SG6842J in tegrates freq uency j ittering fun ction
internally. The frequency jittering fun ction helps reduce
EMI em ission of a power supply wi th minimum line
filters. Also, its built-in synchronized slope compensation
achieves st able pea k-current-mode c ontrol. The
proprietary int ernal line c ompensation ensures c onstant
output power limit over a wide AC input voltages, from
90VAC to 264VAC.
SG6842J pr ovides many protection f unctions. In
addition to cycle-b y-cycle cu rrent limitin g, th e in ternal
open-loop protection circuit ensures safety should an open
loop or output short-circuit failure occurs. PWM output is
disabled till V DD d rops below th e UVLO lo wer lim it.
Then, th e co ntroller starts up agai n. As long as VDD
exceeds about 24V, the internal OVP circuit is triggered.
An exte rnal NTC t hermistor ca n be applied for
over-temperature pr otection. For OV P and OTP , the
protection m ode can be c hosen t o be l atch o ff or aut o
recovery.
SG6842J is av ailable in a n 8 -pin DIP o r S OP
package.
© System General Corp.
Version 1.4(IAO33.0015.B4)
-1-
www.sg.com.tw
Feb. 13, 2006
http://www.Datasheet4U.com
1 page  
Highly-Integrated Green-Mode PWM Controller
Product Specification
SG6842J
Oscillator Section
Symbol Parameter
FOSC
Normal PWM Frequency Center Frequency
Jitter Range
TJTR Jittering
FOSC-G-MIN
FDV
FDT
Period
Green-Mode Min. Frequency
Frequency Variation Versus VDD Deviation
Frequency Variation Versus Temp. Deviation
Test Condition
RI = 26kΩ
RI = 26kΩ 3.9
RI = 26kΩ
VDD = 11.5V to 20V
TA = -30 to 85 ℃
Min. Typ.
62 65
±3.7 ±4.2
4.4
18 22
Max.
68
±4.7
4.9
25
5
5
Unit
kHz
mS
kHz
%
%
Feedback Input Section
Symbol Param eter
AV
ZFB
VHGH
VFB-OL
TLPS
VN
VG
FB Input to Current Comparator Attenuation
Input Impedance
Output High Voltage
FB open-loop trigger level
FB open-loop Protection Delay
Green-Mode Entry FB Voltage
Green-Mode Ending FB Voltage
FG-TEST Burst-Mode
test Frequency
IZERO
PWM OFF FB Voltage
Test Condition
@Green mode
FB pin open
RI = 26kΩ
VG+20mV
Min. Typ.
1/4.5
1/4
4
5.5
5
50 56
1.9 2.1
VN-0.6 V
FOSC-G-MIN
+0.5
N-0.5 V
Max.
1/3.5
7
5.4
62 mS
2.3
N-0.4 V
1.5
Unit
V/V
kΩ
V
V
V
KHz
mA
Current Sense Section
Symbol Parameter
ZCS
VTH80
Input Impedance
Threshold voltage for current limit
VTH160
Threshold voltage for current limit
TPD Propagation Delay to GATE Output
TLEB Leading Edge Blanking Time
VSLOPE Slope
Compensation
Test Condition
Min. Typ.
12
IVIN = 80uA, RI = 26kΩ
IVIN = 160uA, RI = 26kΩ
0.81 0.84
VTH80
-0.085
VTH80
-0.07
100
260 360
SENSE=2KΩ, Dut y
DCYMAX
= 0.34 0.37
Max.
0.87 V
VTH80
-0.055
200
460
0.41 V
Unit
kΩ
V
nS
nS
© System General Corp.
Version 1.4(IAO33.0015.B4)
-5-
www.sg.com.tw
Feb. 13, 2006
5 Page 
Highly-Integrated Green-Mode PWM Controller
PACKAGE INFORMATION
8PINS-DIP(D)
D
85
14
E
Product Specification
SG6842J
Θ°
eB
L
b1
e
b
Dimensions
Symbol
A
A1
A2
b
b1
D
E
E1
e
L
eB
θ˚
Millimeters Inches
Min. Typ. Max.
Min. Typ. Max.
5.334
0.210
0.381
0.015
3.175
3.302
3.429
0.125
0.130
0.135
1.524
0.060
0.457
0.018
9.017
9.271 10.160
0.355 0.365 0.400
7.620
0.300
6.223
6.350 6.477 0.245 0.250 0.255
2.540
0.100
2.921
3.302 3.810 0.115 0.130 0.150
8.509
9.017 9.525 0.335 0.355 0.375
0˚
7˚ 15
˚ 0˚
7˚ 15
˚
© System General Corp.
Version 1.4(IAO33.0015.B4)
- 11 -
www.sg.com.tw
Feb. 13, 2006
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SG6842J.PDF ] | |
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