IEEE 802.3bt-Compliant, PoE Powered Device with DC-DC Controller
Description
The KTA1142 is a single-chip, highly integrated CMOS solution for Power over Ethernet (PoE) Powered Devices with a PWM controller that integrates all the circuitry required to design a smart and efficient converter for PoE and telecom mid-power applications up to 71Watt output load, include Voice over IP (VoIP) Phones, and 5G/LTE Base Stations, Wireless LAN Access Point, Security Cameras, and Notebook computers. The KTA1142 implements all the physical layer Powered Device (PD) functionality, as required by IEEE® 802.3af-2003 and IEEE® 802.3at-2009 and IEEE® 802.3bt-2019 standards. This includes 8-event classification, Type 1-2 or 3-4 PSE detection indicator, PD detection, under-voltage lockout (UVLO), and Hot-Swap FET integration.
The integrated DC/DC controller features adjustable slope compensation, dual complementary low-side drivers with programmable dead time, programmable soft-start, soft-stop, and a programmable frequency dithering. The controller’s main target is Flyback topology or Active Clamp Forward Converter for PoE.BT applications.
The KTA1142 has been architected to address EM emission concerns in PoE applications. The chip implements many design features that minimize transmission of system common-mode noise onto the Unshielded Twisted Pair (UTP). The device is designed to provide safe, low-impedance discharge paths directly to the earth ground, resulting in superior reliability and circuit protection.
Features
- Fully supports IEEE® Std. 802.3bt
- Supports input power levels up to 90W
- Compatible with IEEE® Std. 802.3af/at
- Support Class 0-8 for PoE PD
- Integrated PWM peak current mode controller
- Dual gate driver with dead time adjustment
- High efficiency topologies:
- Flyback, Forward
- Flyback with synchronous rectification
- Flyback with active clamp
- Forward with active clamp
- Internal slope compensation
- Internal pull-up resistor in feedback for optocoupler and isolated connection
- Robust Type 1, 2, 3 and 4 PSE detector with proprietary digital filtering line noise
- Auto-adjust Maintain Power Signature (MPS) for Type 1-4 PSE
- Supports up to 5 event classification
- Programmable DC current limit up to 2.2A for 90W applications
- IEC 61000-4-2/3/4/5/6 requirements for EMC Compliance
- Exceptional EMI performance
- Frequency dithering programming pin for spread-spectrum frequency operation
- Low RDSON 100V hot-swap FET (typical 0.13Ω)
- Integrated Short-Circuit Protection (SCP) and OCP
- Over temperature protection (OTP)
- Seamless support for local power down to 9.5V
- Supports low power standby modes
- Auto class support
- 4x4mm, 32-lead WQFN Package
- -40°C to +125°C Junction Temperature Range
Applications
- Voice over IP (VoIP) phones, and 5G/LTE Base Stations
- Pan, tilt and zoom (PTZ), security and web cameras
- Lighting and High-Power Wireless Data Systems
- Wireless LAN access points, WiMAX terminals
- Point-of-Sale (POS) terminals, RFID terminals
- Thin clients and notebook computers
- Fiber-to-the-home (FTTH) terminals
Packaging Information
| Package | Dimensions | Pins | Package Code |
| WQFN44-32 | 4mm x 4mm x 0.75mm | 32 | UAT |
Technical Documentation
| Description | Documents | Type |
|---|---|---|
| Datasheet | KTA1142-04a | |
| Package Outline Drawing | WQFN44-32 UAT POD |
Purchase
| Purchase Options |
|---|
| Buy from Digi-Key |
| Buy from Mouser |