Overview
The TEA1995T is a dedicated controller IC for synchronous rectification on the secondary side of resonant converters. It is part of a new generation of Synchronous Rectifier (SR) controller ICs designed for switched mode power supplies. Fabricated in a Silicon On Insulator (SOI) process, the TEA1995T is optimized for high-efficiency power supplies, including those used in PCs, adapters, TVs, and servers.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 4.35 | 4.55 | 4.75 | V | |
| Stop Voltage (Vstop) | 4.0 | 4.2 | 4.4 | V | |
| Operating Supply Current (ICC(oper)) | Normal operation (without gate charge) | 0.9 | 1.1 | 1.3 | mA |
| Energy Save Mode Activation Time (tact(es)) | 85 | 110 | 135 | μs | |
| Driver Activation Voltage (Vact(drv)) | -55 | -400 | mV | ||
| Gate Pull-Down Resistance (Rpd(G)) | VDSA/VDSB = 4 V; IGDA/IGDB = 30 mA; VCC = 12 V | 3.2 | 4 | 5 | Ω |
Key Features
- Adaptive Gate Drive: Ensures maximum efficiency at any load condition.
- High Efficiency: Optimized for high-efficiency power supplies, reducing energy consumption.
- Wide Supply Voltage Range: Operates within a range of 4.5-38V.
- Independent Driver Stages: Two gate driver stages with their own sensing inputs, operating independently.
- Low Supply Current in Energy Save Mode: Below 200 μA, enhancing power efficiency during low-load conditions.
Applications
- Resonant Power Supplies: Ideal for driving two external synchronous rectifier MOSFETs in resonant converters.
- PC Power Supplies: Suitable for high-efficiency power supplies in personal computers.
- Adapters and Chargers: Used in adapters and chargers requiring high efficiency.
- TV and Server Power Supplies: Applicable in power supplies for TVs and servers.
- Multi-Output Flyback Converters: Can be used with SR MOSFETs placed at the low side.
Q & A
- What is the primary function of the TEA1995T?
The TEA1995T is a dedicated controller IC for synchronous rectification on the secondary side of resonant converters.
- What is the supply voltage range of the TEA1995T?
The TEA1995T operates within a supply voltage range of 4.5-38V.
- What are the key features of the TEA1995T's gate drive?
The TEA1995T features adaptive gate drives for maximum efficiency at any load and has two independent driver stages.
- What is the typical operating supply current of the TEA1995T?
The typical operating supply current is 1.1 mA.
- What is the energy save mode activation time of the TEA1995T?
The energy save mode activation time is typically 110 μs.
- What are some common applications of the TEA1995T?
Common applications include resonant power supplies, PC power supplies, adapters, TVs, and servers.
- How does the TEA1995T enhance power efficiency?
The TEA1995T enhances power efficiency through its adaptive gate drive and low supply current in energy save mode.
- What is the significance of the SOI process in the TEA1995T?
The SOI process helps in achieving high efficiency and reliability in power supplies.
- Can the TEA1995T be used in multi-output flyback converters?
Yes, the TEA1995T can be used in multi-output flyback converters with the SR MOSFET placed at the low side.
- What is the gate pull-down resistance of the TEA1995T?
The gate pull-down resistance is typically 4 Ω.
