SG6841D ETC-unknow, SG6841D Datasheet

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SG6841D

Manufacturer Part Number
SG6841D
Description
Manufacturer
ETC-unknow
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
SG6841D
Manufacturer:
FSC
Quantity:
6 222
Price:
High-integrated Green-mode PWM Controller
FEATURES
T Green-mode PWM to support “Blue Angel” Norm
T Low start up current 30uA
T Low operation current 3mA
T Leading-edge blanking
T Built-in synchronized slope compensation
T
T Current mode operation
T Cycle-by-cycle current limiting
T Under voltage lockout (UVLO)
T Programmable PWM frequency
T GATE output maximum voltage clamped at 18V
T Totem pole output includes soft driving for better
T
T Programmable over-temperature protection
T Few external components & low cost solution
APPLICATIONS
and flyback power converters, and
T Power Adapter
T Open-frame SMPS
T Battery Charger Adapter
TYPICAL APPLICATION
©System General Corp.
Version 1.7 (IRO33.0001.B1)
Constant output power limit for universal AC input
EMI
Build-in limited-power-control to meet safety
requirement
General-purpose switching mode power supplies
RT
RA
From bridge rectifier
127~ 373VDC
RI
RIN
FB
RI
RT
VIN
SG6842
GND
SENSE
- 1 -
VDD
GATE
This highly integrated PWM controllers, SG6841 series,
provides several features to enhance the performance of
low power flyback converters. 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 assists the power
supply to easily meet the power conservation
requirement. Due to BiCMOS process, the start-up
current and operation current is reduced to 30uA and
3mA, respectively, to improve power conversion
efficiency. Large start-up resistance can be used for
further power saving. Built-in synchronized slope
compensation ensures the stability of peak current mode
control. A proprietary internal compensation ensures
constant output power limit for universal AC input
voltage from 90VAC to 264VAC.
DESCRIPTION
Pulse by pulse current limit ensures a constant output
current under short circuit. If a short circuit failure or
over load happens, the SG6841 will shut off after a
continuous high voltage detection on FB pin. The gate
output is clamped at 18V to protect the power MOS
from over voltage damage.
thermistor can be applied to sense the ambient
temperature for over-temperature protection. The
SG6841 series are available in 8-pin DIP and SO
packages.
C
IN
SG6841 provides many protection functions.
D1
Rg
From auxiliary
R
winding
S
Q1
Product Specification
An external NTC
www.sg.com.tw
JUL.25,2003
SG6841

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SG6841D Summary of contents

Page 1

High-integrated Green-mode PWM Controller FEATURES T Green-mode PWM to support “Blue Angel” Norm T Low start up current 30uA T Low operation current 3mA T Leading-edge blanking T Built-in synchronized slope compensation T Constant output power limit for universal AC ...

Page 2

... High-integrated Green-mode PWM Controller MARKING DIAGRAMS DIP SOP XXXXXXX: Wafer Lot YY: Year; WW: Week SG6841T V: Assembly Location XXXXXXXYYWWV 1 ORDERING INFORMATION Part Number Package SG6841S 8-Pin SOP SG6841D 8-Pin DIP PIN DESCRIPTIONS Pin No. Symbol Function 1 GND Ground 2 FB Feedback 3 VIN Start-Up Input ...

Page 3

High-integrated Green-mode PWM Controller BLOCK DIAGRAM 0.85V VIN + 3 _ UVLO VDD 16V/10V 0.65V ©System General Corp. Version 1.7 (IRO33.0001.B1 ON/OFF Driver Internal Green Mode OSC Q S ...

Page 4

High-integrated Green-mode PWM Controller ABSOLUTE MAXIMUM RATINGS Symbol Parameter DC Supply Voltage V DD Zener clamp Zener current I Gate Output Current OUT V Input Voltage to FB Pin FB V Input Voltage to SENSE Pin Sense V Input Voltage ...

Page 5

High-integrated Green-mode PWM Controller Current Sense Section Symbol Parameter Z Input impedance CS T Delay to Output PD V Threshold voltage for current limit TH The change of threshold voltage versus the input û VIN current of ...

Page 6

High-integrated Green-mode PWM Controller Over-Temperature Protection Section Symbol Parameter I Output current of pin Threshold voltage for over-temperature protection. OTP,STOP Turn-off point. Duty cycle is reduced to 0%. V Threshold voltage for over-temperature protection. OTP,START Starting point. ...

Page 7

High-integrated Green-mode PWM Controller TYPICAL CHARACTERISTICS Start-up Current ( Tem perature DD ST 25.5 25.0 24.5 24.0 23.5 23.0 22.5 22.0 -40 -25 - TEMPERATURE ( : : : : ) Frequency vs. FB ...

Page 8

High-integrated Green-mode PWM Controller Min. Operating Voltage (V Tem perature 10.20 10.15 10.10 10.05 10.00 9.95 9.90 9.85 9.80 9.75 9.70 -40 -25 - TEMPERATURE ( : : : : ) RT Voltage vs Ton 14 ...

Page 9

High-integrated Green-mode PWM Controller OPERATION DESCRIPTION Start-up current Typical start-up current is only 30uA so that a high resistance, and low-wattage, start-up resistor can be used to minimize power loss. For an AC/DC adapter with universal input range, a 1.5 ...

Page 10

High-integrated Green-mode PWM Controller Built-in Slope Compensation The sensed voltage across the current sense resistor is used for current mode control and pulse-by-pulse current limiting. Built-in slope compensation will improve stability or prevent sub-harmonic oscillation of peak current mode control. ...

Page 11

High-integrated Green-mode PWM Controller REFERENCE CIRCUIT Circuit F1 CN1 VZ1 THER1 BOM Reference Component BD1 BD 4A/600V C1 XC 0.1uF/275V C2 XC 0.22uF/275V C3 CC ...

Page 12

High-integrated Green-mode PWM Controller PACKAGE INFORMATION 8 PINS– DIP ( Dimension Millimeter Symbol Min 0.381 A2 3.175 9.017 E E1 6.223 e L 2.921 e 8.509 B ð+ ...

Page 13

High-integrated Green-mode PWM Controller 8 PINS– SOP ( Dimension Millimeter Symbol Min. A 1.346 A1 0.101 4.648 E 0.381 5.791 L 0.406 ð ...

Page 14

High-integrated Green-mode PWM Controller LIFE SUPPORT System General’s products are not designed to be used as components in devices intended to support or sustain human life. Use of System General’s products in components intended for surgical implant into the body, ...

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