TEA1795T/N1,118 NXP

TEA1795T GreenChip synchronous rectifier controller Rev. 1 4 November 2010 Product data sheet 1. General description The TEA1795T is a member of the new generation of Synchronous Rectifier (SR) controller ICs for switched mode power supplies. Its high level of integration enables the design of a cost-effective power supply with a minimum number of external components. The TEA1795T is a dedicated controller IC for synchronous rectification on the secondary side of resonant converters. It has two driver stages for driving the SR MOSFETs, which are rectifying the outputs of the central tap secondary transformer windings. The two gate driver stages have their own sensing inputs and operate independently of each other. The TEA1795T is fabricated in a Silicon On Insulator (SOI) process. 2. Features and benefits 2.1 Distinctive features Accurate synchronous rectification functionality Wide supply voltage range (8.5 V to 38 V) Separate sense inputs for sensing the drain and source voltage of each SR MOSFET High level of integration, resulting in a minimum external component count High driver output voltage of 10 V to drive all MOSFET brands to the lowest R DSon 2.2 Green features Low current consumption High system efficiency from no load to full load 2.3 Protection features UnderVoltage Protection (UVP) 3. Applications The TEA1795T is intended for resonant power supplies. In such applications, it can drive two external synchronous rectifier MOSFETs which replace diodes for the rectification of the voltages on the two secondary windings of the transformer. It can be used in applications such as: Adapters ATX power suppliesTEA1795T NXP Semiconductors GreenChip synchronous rectifier controller Server power supplies LCD television Plasma television 4. Ordering information Table 1. Ordering information Type number Package Name Description Version TEA1795T/N1 SO8 plastic small outline package 8 leads body width 3.9 mm SOT96-1 5. Block diagram V CC 7 SUPPLY UVLO AND BIAS control A TIMER 0.4 s 4 RQ TIMER DSA 3 GDA 0.5 s & S Q DRIVER 25 mV 12 mV 220 mV 1 SSA TEA1795T control B TIMER 0.4 s 5 RQ TIMER DSB 6 GDB 0.5 s & S Q DRIVER 25 mV 12 mV 220 mV 8 SSB 2 GND 001aal796 Fig 1. Block diagram TEA1795T All information provided in this document is subject to legal disclaimers. NXP B.V. 2010. All rights reserved. Product data sheet Rev. 1 4 November 2010 2 of 14