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System General

SG5701TZ Datasheet Preview

SG5701TZ Datasheet

Low Cost Green-Mode PWM Controller

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Low Cost Green-Mode PWM Controller for Flyback Converters
Product Specification
SG5701
FEATURES
Green-Mode PWM
Supports the “Blue Angel” Standard
Low Start-up Current (10uA)
Low Operating Current (2mA)
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
Gate Output Voltage Clamped at 17V
Low Cost
Few External Components Required
Small SOT-26 Package
APPLICATIONS
General-purpose switching mode power supplies and
flyback power converters, such as
Battery chargers for cellular phones, cordless phones,
PDAs, digital cameras, and power tools
Power adapters for ink jet printers, video game
consoles, and portable audio players
Open-frame SMPS for TV/DVD standby and other
auxiliary supplies, home appliances, and consumer
electronics
Replacements for linear transformers and RCC
SMPS
PC 5V standby power.
DESCRIPTION
This highly-integrated PWM controller provides
several special enhancements designed to meet the low
standby-power needs of low-power SMPS. 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 enables the power
supply to easily meet even the strictest power
conservation requirements.
The BiCMOS fabrication process enables reducing
the start-up current to 10uA, and the operating current to
2mA. 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 SG5701’s output
driver is clamped at 17V. SG5701 controllers can be used
to improve the performance and reduce the production
cost of power supplies. The SG5701 is the best choice for
replacing linear and RCC-mode power adapters. It is
available in 8-pin DIP and 6-pin SOT-26 packages.
TYPICAL APPLICATION
© System General Corp.
Version 1.0(IAO33.0025.B1)
-1-
www.sg.com.tw
Mar. 28, 2006




System General

SG5701TZ Datasheet Preview

SG5701TZ Datasheet

Low Cost Green-Mode PWM Controller

No Preview Available !

Low Cost Green-Mode PWM Controller for Flyback Converters
Product Specification
SG5701
MARKING DIAGRAMS
AAEMW
AAE:SG5701
M: Mask Version
W: Week
: Lead Free
PIN CONFIGURATION
GND
FB
RI
SOT-26
GATE
VDD
SENSE
SG5701DP
XXXXXXXXYWWV
D: D=DIP
P : Z =Lead Free
Null=Regular Package
XXXXXXXX: Wafer Lot
Y: Year
WW: Week
V: Assembly Location
GATE
VDD
NC
SENSE
DIP-8
GND
FB
NC
RI
ORDERING INFORMATION
Part Number
PWM Frequency
SG5701TZ
70kHz
SG5701DZ
70kHz
Package
6-Pin SOT-26 (Lead Free)
8-pin DIP-8 (Lead Free)
PIN DESCRIPTIONS
Name Pin No.
Type
DIP-8 / (SOT-26)
GATE 1 / (6)
Driver Output
VDD
2 / (5)
Supply
NC 3
SENSE 4 / (4)
Analog Input
RI 5 / (3)
NC
FB
GND
6
7 / (2)
8 / (1)
Analog
Input/Output
Analog Input
Supply
Function
The totem-pole output driver for driving the power MOSFET.
Power supply.
NC pin.
Current sense. This pin senses the voltage across a resistor. When the voltage reaches
the internal threshold, PWM output is disabled. This activates over-current protection.
This pin also provides current amplitude information for current-mode control.
A resistor connected from the RI pin to ground will generate a constant current source for
the SG5701. This current is used to charge an internal capacitor, to determine the
switching frequency. Increasing the resistance will reduce the amplitude of the current
source and reduce the switching frequency. A 95kresistor Ri results in a 50uA constant
current Ii and a 70kHz switching frequency.
NC pin.
Feedback. The FB pin provides the output voltage regulation signal. It provides feedback
to the internal PWM comparator, so that the PWM comparator can control the duty cycle.
Ground.
© System General Corp.
Version 1.0(IAO33.0025.B1)
-2-
www.sg.com.tw
Mar. 28, 2006


Part Number SG5701TZ
Description Low Cost Green-Mode PWM Controller
Maker System General
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