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发布者:来自网络 发布时间:2016-12-14 阅读:275次    关键字: 802.3 af/at
CY1122-整合802.3 af/at 协议和DC/DC Converter的高效能二合一芯片


CY1122-整合802.3 af/at 协议和DC/DC Converter的高效能二合一芯片
 
CY1122_Evaluation Board

CY1122-High Efficiency, Integrated 802.3at PoE-PD Controller and DC/DC Controller DataSheet

GENERAL DESCRIPTION
The CY1122 is a power solution for PoE PD (Powered Device). It integrates anIEEE802.3 af/at
compliant PoE PD controller and a high efficiency current mode DC/DC controller. The PD controller
includes PoE detection, classification, under-voltage lockout (UVLO) and an inrush control.
With the inrush current limit mechanism, CY1122 is safely protected during the input capacitor charging
and without interruption due to die heating. The PoE interface allows both the classification and the
current limitation are programmable through the adjusting of application circuits. Also, CY1122 performs
IEEE802.3at Layer1 hardware classification, and provides an indication of Type 2 PSE detection.
The CY1122 also implements all features which are necessary in DC/DC controller for a flexible, robust
and highly efficient design, including programmable switching frequency, duty cycle up to 80%, slope
compensation, soft startup, and bootstrap startup source. In addition, a decent gate driver is
implemented to optimize the design of forward and flyback converters.
Besides, CY1122 supports different input voltage options either from PoE front input or rear external
adapter dependent on users’ preferences. The DC/DC converter is designed for 9V converter startup
circuitry. Both isolated and non-isolated DC/DC converter topologies are supported. To be a good power
solution, CY1122 also incorporates a variety of protections: OCP(over current protection), SCP(short
circuit protection), OVP(over voltage protection) and OTP (over temperature protection)

FEATURES
• IEEE 802.3af/at compliant PD controller
• Type 2 PSE indication per IEEE802.3at
• Power delivery up to 25.5 Watt
• Integrated 100V 0.65 Ω hot swap MOSFET
• Accurate 140 mA typical inrush current level
• Programmable classification
• Current limit at 1000 mA
• Programmable UVLO of hot swap switch
• Programmable DC/DC switching frequency
• Current mode pulse width modulator
• 80% max duty cycle w/ internal compensation
• Support for isolated / non-isolated converters
• Seamless support for local power down to 9V
• OCP, SCP, OVP and OTP protections
• -40°C to 85°C ambient temperature range
TSSOP-20 Package

APPLICATIONS
• Wireless access points
• IP security cameras
• Digital signage
• VoIP phones
• Small-cell base stations
• Safety backup power
• Thin/Zero Client Terminals
• PoE LED networking
IEEE 802.3af/at PoE powered device

 
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