SG6842 System General, SG6842 Datasheet

SG6842

Manufacturer Part Number

SG6842

Description

Highly Integrated Green-Mode PWM Controller

Manufacturer

System General

Datasheet

1.SG6842.pdf (15 pages)

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Download datasheet (203Kb)

Highly-Integrated Green-Mode PWM Controller

www.DataSheet4U.com

FEATURES

APPLICATIONS

flyback power converters, including:

DESCRIPTION

controllers provides several features to enhance the

performance of flyback converters. To minimize standby

power consumption, a proprietary green-mode function

provides off-time modulation to linearly decrease the

switching frequency under light-load conditions. Under

TYPICAL APPLICATION

Version 0.1(IRO33.0009.B0)

Linearly decreasing PWM frequency

Burst-mode at light load and zero load

Low start-up current (20uA)

Low operating current (4mA)

Internal latch circuit for OTP, OVP

Leading-edge blanking

Built-in synchronized slope compensation

Totem pole output with soft driving

Improved EMI

Constant power limit over a universal AC input

range

Current mode operation

Cycle-by-cycle current limiting

Under Voltage Lockout (UVLO)

Programmable PWM frequency

GATE output maximum voltage clamped at 18V

VDD Over Voltage Protection (OVP)

Programmable Over Temperature Protection (OTP)

Very few external components are required

General-purpose switch mode power supplies and

Power adapters

Open-frame SMPS

Battery Charger Adapter

The highly integrated SG6842 series of PWM

From bridge rectifier

127~ 373VDC

RIN

VIN

SG6842

- 1 -

GND

SENSE

VDD

GATE

zero-load conditions, the power supply enters burst-mode.

This completely shuts off PWM output. Then, the output

restarts just before the supply voltage, VDD, drops below

the UVLO voltage. This green-mode function enables the

power supply to easily meet international power

conservation requirements.

SG6842 series is manufactured using the BiCMOS

process. This allows the start-up current to be reduced to

20uA, and the operating current to be reduced to 4mA.

For even higher power conversion efficiency, a large

start-up resistance can be used.

the stability of peak current mode control. Proprietary

internal compensation ensures constant output power

limiting over a universal range of AC input voltages, from

90VAC to 264VAC.

functions. Pulse-by-pulse current limiting ensures a

constant output current, even when short circuits occur.

Should an open circuit failure occur in the feedback loop,

the internal protection circuit will disable PWM output.

PWM output will be disabled as long as VDD remains

higher than 26V. The gate output is clamped at 18V to

protect the power MOS from over-voltage damage. An

external NTC thermistor can be applied to sense the

ambient temperature for over temperature protection.

When either over temperature conditions or VDD over

voltage faults are detected, an internal latch circuit is used

to latch-off the controller. The latch will reset when the

temperature cools off sufficiently, or when the VDD

power supply is disabled.

DIP and SO packages.

For improved power conversion efficiency, the

Built-in synchronized slope compensation ensures

SG6842 controllers provide many protection

SG6842 series controllers are available in both 8-pin

From auxiliary

winding

Preliminary Specification

www.sg.com.tw

Apr.09, 2003

SG6842

Related parts for SG6842

SG6842 Summary of contents

Page 1

... The latch will reset when the temperature cools off sufficiently, or when the VDD power supply is disabled. SG6842 series controllers are available in both 8-pin DIP and SO packages. From bridge rectifier D1 127~ 373VDC ...

Page 2

... DIP SOP XXXXXXX: Wafer Lot YY: Year; WW: Week V: Assembly Location ORDERING INFORMATION The SG6842 family of controllers is distinguished for its protection features and burst-mode functionality. Green-Mode Function: Linearly Decreasing Frequency and Burst-Mode OTP Latch: Part Number Reset when AC is unplugged (L). SG6842BS ...

Page 3

... Linear-Mode with Burst-Mode: After the PWM frequency linearly decreases from the maximum frequency of 65kHz to around 22kHz, the controller can enter into burst-mode. In burst-mode, PWM completely and the V voltage begins dropping. When V DD the SG6842 will start to send out PWM signals at a frequency of 27kHZ. © System General Corp. Version 0.1(IRO33.0009.B0) Hysteresis OTP: OVP Latch: ...

Page 4

... The line voltage is detected to compensate the output power limit, so that it can be kept constant over a universal AC input range A resistor from the RI pin to ground will generate a constant current source for the SG6842. This current charges an internal capacitor. This determines the switching frequency. ...

Page 5

... System General Corp. Version 0.1(IRO33.0009.B0 Current 5V source O.V.P. Soft ON/OFF + Driver Internal BIAS Q Green Mode D o.s.c. Controller O.T.P. Bnk 1 GND - 5 - Preliminary Specification SG6842 VDD GATE Q2 Rg slope Compensation 0.15V Rs ∑ 0.85V www.sg.com.tw Apr.09, 2003 SENSE FB ...

Page 6

... Junction-Air DIP 82.5 SOP 141 - 150 - -40 to 125 - -65 to +150 10 sec DIP 260 10 sec SOP 230 - 2.0 - 200 Min. - -30 Test Condition Min. 1/3 SG6842 Unit °C/W °C °C °C ° Max. Unit °C Typ. Max. Unit 1/4 1/4 ...

Page 7

... VDD=15V Ri=26KΩ VDD=11 to 20V Ta=- ℃ VTH(OFF) + 0.8 Test Condition Min 260 Test Condition Min. VDD= 12V 50mA VDD= 12V 50mA 8V VDD=15V, CL=1nF 150 VDD=15V, CL=1nF 30 VDD=25V - 7 - SG6842 Typ. Max. Unit 12 16 kΩ 100 200 nsec 0.85 0.9 V -0.15 -0. msec 32 msec Typ. Max. ...

Page 8

... VDD Over Voltage Protection Debounce (Disable PWM Output) VDD-ZENER VDD ZENER Crowbar © System General Corp. Version 0.1(IRO33.0009.B0) Preliminary Specification Test Condition Min. Ri=26KΩ 64 1.015 2 1.05 Test Condition Min. 15.5 9.5 - 23.5 IDD = 10mA SG6842 Typ. Max. Unit 1.05 1.085 msec 1.15 1.25 V Typ. Max. Unit 16.5 17.5 V 10.5 11 ...

Page 9

... Highly-Integrated Green-Mode PWM Controller www.DataSheet4U.com TYPICAL CHARACTERISTICS This page is purposely left blank. © System General Corp. Version 0.1(IRO33.0009.B0) Preliminary Specification - 9 - SG6842 www.sg.com.tw Apr.09, 2003 ...

Page 10

... VDD during start-up. Gate Output / Soft Driving The BiCMOS output stage of a SG6842 is a fast totem pole gate driver. Cross-conduction has been avoided to minimize heat dissipation, increase efficiency, and enhance reliability. The output driver is clamped by ...

Page 11

... Protection Latch Circuit In some applications, latch operation for OVP or OTP may be necessary. For the SG6842 family, the optional built in latch function provides a versatile protection feature that does not require external components. See ordering information for a detailed description ...

Page 12

... Reference Component Q2 MOS 2A/600V R1,R2 R 470KΩ 1/ 47Ω 1/ 22Ω 1/ 4.7KΩ 1/ 0.5Ω 1W R8,R12 R 510KΩ 1/ 20KΩ 1/8W 1% R10 R 100Ω 1/8W THER1 Thermistor SCK054 T1 Transformer EI28 U1 IC SG6842 U2 IC 4N35D U3 IC TL431 VZ1 SG6842 www.sg.com.tw Apr.09, 2003 ...

Page 13

... Preliminary Specification SG6842 Θ Typ. Max. 0.210 0.130 0.135 0.060 0.018 0.365 0.400 0.300 0.250 0.255 0.100 0.130 0.150 0.355 0.375 7˚ ...

Page 14

... Preliminary Specification SG6842 C L Typ. Max. 0.069 0.010 0.016 0.008 0.196 0.157 0.050 0.015X45˚ 0.244 0.050 8˚ www.sg.com.tw Apr.09, 2003 ...

Page 15

... RIGHT TO MAKE CHANGES System General reserves the right to change this document and/or this product without notice. Customers are advised to consult their System General sales representative before ordering. © System General Corp. Version 0.1(IRO33.0009.B0) DISCLAIMERS - 15 - Preliminary Specification SG6842 www.sg.com.tw Apr.09, 2003 ...

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