sg5842jasz-f116 Fairchild Semiconductor, sg5842jasz-f116 Datasheet

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sg5842jasz-f116

Manufacturer Part Number
sg5842jasz-f116
Description
Sg5842 ? Highly Integrated Green-mode Pwm Controller
Manufacturer
Fairchild Semiconductor
Datasheet
Highly Integrated Green-Mode PWM Controller
FEATURES
APPLICATIONS
General-purpose switch mode power supplies and flyback
power converters, including:
DESCRIPTION
The highly integrated SG5842A/JA series of PWM
controllers provides several features to enhance the
performance of flyback converters.
TYPICAL APPLICATION
© System General Corp.
Version 1.4.2 (IAO33.0026.B6)
Green-Mode PWM Controller
Low Start-up Current (14µA)
Low Operating Current (4mA)
Programmable PWM Frequency with Hopping
(5842JA)
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Synchronized Slope Compensation
Leading-Edge Blanking
Constant Output Power Limit
Totem Pole Output with Soft Driving
V
Programmable Over-Temperature Protection (OTP)
Internal Latch Circuit (OTP, OVP)
Internal Open-Loop Protection
V
GATE Output Maximum Voltage Clamp (18V)
Notebook Power Adapters
Open-Frame SMPS
DD
DD
Over-Voltage Protection (OVP)
Under-Voltage Lockout (UVLO)
SG5842A/JA
- 1 -
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
continuously decrease the switching frequency at
light-load conditions. To avoid acoustic-noise problem,
the minimum PWM frequency set above 22KHz. This
green-mode function enables the power supply to meet
international power conservation requirements. To further
reduce
manufactured using the BiCMOS process. This allows a
low start-up current, around 14µA, and an operating
current of only 4mA. As a result, a large start-up
resistance can be used.
The
compensation achieves stable peak-current-mode control.
SG5842JA integrates a frequency hopping function that
helps reduce EMI emission of a power supply with
minimum line filters.
SG5842A/JA provides many protection functions. In
addition to cycle-by-cycle current limiting, the internal
open-loop protection circuit ensures safety should an open
loop or output short-circuit failure occur. PWM output is
disabled until V
then the controller starts again. As long as V
about 24V, the internal OVP circuit is triggered. An
external
over-temperature protection.
SG5842A/JA is available in an 8-pin DIP or SOP package.
SG5842A/JA
power
NTC
www.sg.com.tw • www.fairchildsemi.com
DD
thermistor
drops below the UVLO lower limit,
consumption,
built-in
Product Specification
can
synchronized
SG5842A/JA
be
October 30, 2007
SG5842A/JA
applied
DD
exceeds
slope
for
is

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sg5842jasz-f116 Summary of contents

Page 1

Highly Integrated Green-Mode PWM Controller FEATURES Green-Mode PWM Controller Low Start-up Current (14µA) Low Operating Current (4mA) Programmable PWM Frequency with Hopping (5842JA) Peak-Current-Mode Control Cycle-by-Cycle Current Limiting Synchronized Slope Compensation Leading-Edge Blanking Constant Output Power Limit Totem Pole Output ...

Page 2

... DIP SOP Lead Free SG5842HATP Null = regular package XXXXXXXXYWWV XXXXXXXX: Y: Year; WW: Week V: Assembly Location ORDERING INFORMATION Part Number OTP Latch OVP Latch Frequency Hopping Pb-Free SG5842JASZ Yes SG5842JADZ Yes SG5842ASZ (Preliminary) Yes SG5842ADZ (Preliminary Yes PIN DESCRIPTIONS Pin No. Symbol Function Description ...

Page 3

Highly Integrated Green-Mode PWM Controller BLOCK DIAGRAM 5842JA only © System General Corp. Version 1.4.2 (IAO33.0026.B6 www.sg.com.tw • www.fairchildsemi.com Product Specification SG5842A/JA October 30, 2007 ...

Page 4

Highly Integrated Green-Mode PWM Controller ABSOLUTE MAXIMUM RATINGS Symbol Parameter V Supply Voltage VDD V Input Terminal VIN V Input Voltage to FB Pin FB V Input Voltage to SENSE Pin SENSE V Input Voltage to RT Pin RT V ...

Page 5

Highly Integrated Green-Mode PWM Controller Oscillator Section Symbol Parameter F Normal PWM Frequency OSC t Hopping Period HOP F Green-Mode Minimum Frequency OSC-G F Frequency Variation vs Frequency Variation vs. Temperature Deviation DT Feedback Input Section ...

Page 6

Highly Integrated Green-Mode PWM Controller GATE Section Symbol Parameter DCY Maximum Duty Cycle MAX V Output Voltage Low GATE-L V Output Voltage High GATE-H t Rising Time r t Falling Time f I Peak Output Current O V Gate Output ...

Page 7

Highly Integrated Green-Mode PWM Controller TYPICAL CHARACTERISTICS Start-up Current ( Temperature DD -40 -25 - Temperature (℃) Operation Current ( VDD Voltage DD- ...

Page 8

Highly Integrated Green-Mode PWM Controller Max. Duty Cycle (DCY ) vs Temperature -40 -25 - Tem perature (℃) Output Current of RT pin ( Temperature ...

Page 9

Highly Integrated Green-Mode PWM Controller OPERATION DESCRIPTION Start-up Current The typical start-up current is only 14µA, which allows a high-resistance, low-wattage start-up resistor to be used to minimize power loss. A 1.5MΩ, 0.25W, start-up resistor and a 10µF/25V V hold-up ...

Page 10

Highly Integrated Green-Mode PWM Controller Constant Output Power Limit When the SENSE voltage, across the sense resistor R reaches the threshold voltage, around 0.85V, the output GATE drive is turned off after a small delay t introduces additional current, proportional ...

Page 11

Highly Integrated Green-Mode PWM Controller REFERENCE CIRCUIT CN1 VZ1 3 TR1 GND VIN SG5842A/JA BOM Reference Component BD1 BD 4A/600V C1 XC 0.68µF/300V ...

Page 12

Highly Integrated Green-Mode PWM Controller PACKAGE INFORMATION 8PINS-DIP( Dimensions Millimeters Symbol Min 0.381 A2 3.175 9.017 E E1 6.223 e L 2.921 eB 8.509 θ˚ 0˚ © System General Corp. ...

Page 13

Highly Integrated Green-Mode PWM Controller 8PINS-SOP( Dimensions Millimeter Symbol Min. A 1.346 A1 0.101 4.648 E 3.810 e 1.016 F H 5.791 L 0.406 θ˚ 0° © System General Corp. Version 1.4.2 (IAO33.0026.B6) ...

Page 14

Highly Integrated Green-Mode PWM Controller © System General Corp. Version 1.4.2 (IAO33.0026.B6 www.sg.com.tw • www.fairchildsemi.com Product Specification SG5842A/JA October 30, 2007 ...

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