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SG6105 Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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SG6105 Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
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10 / 13 page  Product Specification Power Supply Supervisor + Regulator + PWM SG6105 ©System General Corp. - 10 - www.sg.com.tw Version 2.3(IRO33.0011.B0) June 19, 2003 Example of Using SG6105 for the ATX Power Supply Protection against over-voltage, short-circuit and 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. The features and benefits of this device are listed below: 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 FEATURE DESCRIPTIONS 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 threshold level. PG pin goes high when the above condition is reached. A 2K pull up resistor may connect to 5V. 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. Supervisory Circuit Operation The PC generates the remote ON/OFF logic (PSON), 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 The application guide shows the key-feature of 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 Through a resistor divider, UVAC is connected to 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 |
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