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Abstract: Introduce the function of the power management monitoring chip PS223 of Dianjing Technology and its design and application in high performance and high power ATX switching power supply. PS223 is the most complete and universal control chip for protection against overvoltage, overcurrent, undervoltage, short circuit, overload and lightning protection. The switching power supply designed with this chip has simple protection circuit, complete functions, energy saving and safety. The feature is that the product is positioned at the server user and enthusiast level.
Keywords: power management monitoring; chip; switching power supply; PS223; ATxl2V 2.2 power supply

Switching Power Supply (SPS) utilizes modern power electronics technology to be widely used in electronic devices, such as various terminal devices and communication devices, which are small, energy-saving, lightweight, and highly efficient. Switching power supply is based on safety and reliability. High-performance high-power ATX power supply design uses power management monitoring chip to achieve anti-surge soft start and protection against overvoltage, undervoltage, overheat, overcurrent, short circuit and overtemperature. .

1 ATX power supply overview and power management monitoring protection
Intel's high-power (350-900 W) ATX power specification version is ATXl2V 2.2, +12 V uses dual output, one of which +12 V (A) is dedicated to the CPU, and the other +12 V (B ) Power is supplied to other devices, and the connector output to the motherboard is 24 pins to output two groups of +12 V.
The high-performance switching power supply is designed as an active power factor correction (PFC), using a CM6800G integrated PFC/PWM controller such as Champion to provide PFC and PWM power stage circuit integration control for power supplies, using power supplies such as PS223. The management monitor chip provides multiple protections such as overvoltage, overcurrent, overpower, low voltage and short circuit. Temperature is the most important factor affecting the reliability of power supply equipment. According to the analysis of relevant data, overheating will cause damage to the power device, and an overheat protection circuit needs to be provided. The short circuit protection (SCP) and overload protection (OPP) in the protection design are ATXl2V mandatory standards, which are triggered to protect the power supply when the short circuit and the total load of each road are overloaded; the overcurrent protection (OCP) prevents the output of the power supply from being overloaded; (OTP) prevents internal overheating of the power supply; overvoltage/undervoltage protection (OVP/UVP) is used to trigger when the output voltage exceeds/below the standard value of 20~25%. If the power supply is abnormal, the output will be cut off immediately. All have no output. At the moment when the power is turned on, the fan stops and the power is protected.

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