Kinetic Technology has unveiled the KTB2140, a PWM controller that integrates all the circuitry required to design a smart and efficient converter for PoE and telecom small and mid-powered applications. It features a programmable oscillator for the switching frequency, adjustable slope compensation, dual low-side drivers with programmable dead time, programmable soft-start, soft-stop, programmable frequency dithering, and maximum duty limit.
An internal high-voltage linear regulator allows the device to start up with a minimum number of external components. There are dual low-side gate drivers that are mainly for active clamp forward applications. When the second driver is not used in low-power flyback converters, it can be floating. The KTB2140 device embeds a set of protections that enable the design of a self-protected converter. It also targets high-efficiency conversion at a wide range of loads.
Key features
- Fully supports IEEE Std. 802.3bt
- PWM peak current mode controller
- Dual low-side gate driver
- High-efficiency topologies:
- Flyback, Forward
- Flyback with synchronous rectification
- Flyback with active clamp
- Forward with active clamp
- Wide VIN Range: 8 V to 80 V
- >1.5 A Output Gate Drive Capability
- Programmable fixed frequency up to 1MHz
- Integrated Short-Circuit Protection.
- Programmable Soft Start Time
- Programmable dead time between G1 and G2
- Programmable slope compensation
- Internal pull-up resistor in feedback for an optocoupler and isolated connection
- Over-current, OV/UVLO, and thermal Protection
- Programmable Frequency Dithering for Low EMI Spread Spectrum Operation
- Synchronous External Clock
- Soft turn off
- Maximum duty cycle limit
- Internal high voltage start-up regulator
- -40°C to +125°C Junction Temperature Range
- Small 3 mmx3 mm WQFN Package
Key applications
- PoE Powered Devices
- Up to 200 Watt SMPS
- Voice over IP (VoIP) Phones
- Lighting and High-Power Wireless Data Systems
- Wireless LAN Access Points, WiMAX Terminals
- Point-of-sale (POS) Terminals, RFID Terminals
- Thin Client and Notebook Computers
- Fiber-to-the-home (FTTH) Terminals
