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doc APW8723 5V to 12V Single Buck Voltage Mode PWM Controller
Carlos Porto postou um tópico em Gerenciador de arquivos
APW8723 5V to 12V Single Buck Voltage Mode PWM Controller Visualizar Arquivo The APW8723 is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The APW8723 allows wide input voltage that is either a single 5V~12V or two supply voltage(s) for various applications. The power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. A built-in soft-start circuit prevents the output voltages from overshoot as well as limits the input current. An internal 0.8V temperature-compensated reference voltage with high accuracy is designed to meet the requirement of low output voltage applications. The APW8723 provides excellent output voltage regulations against load current variation. APW8723 is built in reference voltage offset function for applications that require adjusting supply voltage. The controller’s over-current protection monitors the output current by using the voltage drop across the RDS(ON) of low-side MOSFET, eliminating the need for a current sensing resistor that features high efficiency and low cost. In addition, the APW8723 also integrates excellent protection functions, The over-voltage protection (OVP) , undervoltage protection (UVP) and over-temperature protection (OTP). OVP circuit which monitors the FB voltage to prevent the PWM output from over voltage, and UVP circuit which monitors the FB voltage to prevent the PWM output from under voltage or short circuit. OTP circuit which monitors the junction temperature to prevent over-heating conditions. The APW8723 is available in TDFN3x3-10 package. Uploader Carlos Porto Enviado 08-06-2021 Categoria Datasheets -
doc APW8723 5V to 12V Single Buck Voltage Mode PWM Controller
Carlos Porto postou um arquivo em Datasheets
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The APW8723 is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The APW8723 allows wide input voltage that is either a single 5V~12V or two supply voltage(s) for various applications. The power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. A built-in soft-start circuit prevents the output voltages from overshoot as well as limits the input current. An internal 0.8V temperature-compensated reference voltage with high accuracy is designed to meet the requirement of low output voltage applications. The APW8723 provides excellent output voltage regulations against load current variation. APW8723 is built in reference voltage offset function for applications that require adjusting supply voltage. The controller’s over-current protection monitors the output current by using the voltage drop across the RDS(ON) of low-side MOSFET, eliminating the need for a current sensing resistor that features high efficiency and low cost. In addition, the APW8723 also integrates excellent protection functions, The over-voltage protection (OVP) , undervoltage protection (UVP) and over-temperature protection (OTP). OVP circuit which monitors the FB voltage to prevent the PWM output from over voltage, and UVP circuit which monitors the FB voltage to prevent the PWM output from under voltage or short circuit. OTP circuit which monitors the junction temperature to prevent over-heating conditions. The APW8723 is available in TDFN3x3-10 package. -
devolvido Asus P7H55BR Cpu over Voltage Error
Mix-Info postou um tópico em Motherboards, PCs, All in One & Cia
Cliente tinha uma fonte ATX comum e trocou por fonte real GameMax GM500w para melhor performance. Após 1 mês de uso o computador começou apresentar problemas nas entradas usb e telas azul no Sistema Operacional (Windows10). Ao analisar a placa, percebi que as vezes ligava e não apresentava vídeo ou ligava o cooler girava e desligava, mas tinha hora que ligava normal. Fui logo fazer o teste em todas as tensões da fonte, fio roxo, vermelho ...ok porém ao testar os 12v do amarelo, estava dando 8.5 v /9.5v . Logo coloquei uma fonte atx nova e atualizei o bios, liguei funcionou normal, mas a placa onboard de rede queimou , coloquei uma pci slot comum não funcionau e tentei como uma mini-pci tb não funcionou , tive que colocar um adaptador usb Wilreless pra acessar internet, porém ao ligar apresenta msg Cpu fan error, e Cpu over Voltage Error, e ao conferir o bios as voltagens estão alteradas conforme a imagem, gostaria de saber qual componente posso trocar pra resolver este defeito, e se tem solução.
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