SG6105 ETC, SG6105 Datasheet - Page 10

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SG6105

Manufacturer Part Number
SG6105
Description
Power Supply Supervisor + Regulator + PWM
Manufacturer
ETC
Datasheet

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Power Supply Supervisor + Regulator + PWM
Example of Using SG6105 for the ATX
Power Supply
fault conditions is mandatory in PC power supplies. These
protection circuits can be realized by using many discrete
components and comparators, which occupy a lot of PCB
space and also add to assembling costs. This single chip
controller IC provides complete protection circuits, shunt
regulators, and PWM control function and with less
number of components. SG6105 is an ideal controller IC
for PC switching mode power supplies.
below:
FEATURE DESCRIPTIONS
©System General Corp.
Version 2.3(IRO33.0011.B0)
Over-voltage and under-voltage protection for 3.3V,
5V and 12V without external divider
Over-power protection.
UV protection for –12V and/or –5V.
Power-down warning for power good signal.
Power good signal and power-fail lockup
Remote on/off control.
Delay time for PSON and PS-off signal.
Two shunt regulator for 3.3V and 5V-Standby
regulation.
Complete pulse width modulation (PWM) control
circuitry.
On-chip oscillator.
Programmable Soft-Start.
Maximum 93% duty cycle
Few external components
More reliable system
Little space on PCB
Easy trouble-shooting and implementation
Over voltage protection can be implemented without
any additional components. Over-voltage sense
Levels or 3.3V, 5V, 12V are 4.1V, 6.1V, 14.5V
respectively.
Over current and/or short circuit protection can also
be achieved by using over-power protection, in
which OPP pin is connected to the current
transformer (driver transformer).
The power good signal is asserted to indicate the
3.3V, 5V and 12V is above the under voltage
Protection against over-voltage, short-circuit and
The features and benefits of this device are listed
- 10 -
threshold level. PG pin goes high when the above
condition is reached. A 2K pull up resistor may connect to
5V.
Supervisory Circuit Operation
which is “Low” for power supply “On” and “High” to
switch off the power supply. The remote ON/OFF is
connected to PSON input.
APPLICATION GUIDES
Introduction
SG6105 and illustrates how to use in an ATX switching
mode power supply (SMPS). SG6105 is suitable for
half-bridge, push-pull topology. It incorporates with a
4-channel supervisor, including 5V-standby. The PWM
section of SG6105 comprises a built-in 65kHz oscillator
and high immunity circuits, which protect the system
from noise interference and provide more noise margins
for improper PCB layout. SG6105 has OVP and UVP for
12V, 5V and 3.3V. Besides, the NVP is used for negative
voltage protection, such as –12V and/or –5V. The UVAC
(AC fails detection) is applied to detect AC line condition.
Two built-in internal precision TL431 shunt regulators
can be used for 3.3V or 5V auxiliary standby power.
AC Fails Detection
the secondary power transformer for detecting the AC line
condition. Once the voltage of UVAC is lower than 0.7V
for a period of time, such as 200usec, the PG (power good)
signal will be pulled low to indicate an AC line
power-down condition. The voltage amplitude of the
The VCC can be supplied from the 5V-standby.
When the VCC voltage is higher than 7V, besides the
shunt regulator, the circuit of SG6105 will be
shutdown and reset. No extra power supply is
needed.
Two internal high precision 431 shunt regulators are
built-in. It provides stable reference voltages.
Complete PWM control circuitry including the error
amplifier for push-pull or half-bridge operation.
The PC generates the remote ON/OFF logic (PSON),
The application guide shows the key-feature of
Through a resistor divider, UVAC is connected to
Product Specification
www.sg.com.tw
June 19, 2003
SG6105

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