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发布者:来自网络 发布时间:2016-12-14 阅读:1683次    关键字: PoE-PD
CY1112-整合802.3 af 协议和DC/DC Converter的高效能二合一芯片


CY1112-整合802.3 af 协议和DC/DC Converter的高效能二合一芯片
 

CY1112-High Efficiency, Integrated 802.3af PoE-PD Controller and DC/DC Controller DataSheet


GENERAL DESCRIPTION
The CY1112 is a power solution for PoE PD (Powered Device). It integrates anIEEE802.3 af 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, CY1112 is safely protected during the input capacitor charging
and without interruption due to die heating. The PoE interface allows the classification is programmable
through the adjusting of application circuits. Also, CY1112 input current limit is set at 450mA.
The CY1112 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, an appropriate gate driver is
implemented to optimize the design of forward and flyback converters.
Besides, CY1112 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
capability. Both isolated and non-isolated DC/DC converter topologies are supported.
To be a good power solution, CY1112 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 compliant PD controller
Power delivery up to 13 Watt
Integrated 100V 0.65Ω hot swap MOSFET
Accurate 140 mA typical inrush current level
Programmable classification
Current limit at 450mA
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-14 Package

APPLICATIONS
Wireless access points
IP security cameras
Digital signage
VoIP phones
IoT applications
Safety backup power
Thin/Zero Client Terminals
IEEE 802.3af PoE powered device

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