Overview
The TEA1995DB1294UL is a demonstration board for the TEA1995T GreenChip dual synchronous rectifier controller, manufactured by NXP USA Inc. This controller IC is designed for synchronous rectification on the secondary side of resonant converters, particularly in LLC resonant and multi-output flyback converters. The TEA1995T is part of a new generation of synchronous rectifier (SR) controller ICs, optimized for high efficiency and reliability in switched mode power supplies.
Key Specifications
| Parameter | 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)) | 0.9 | 1.1 | 1.3 | mA |
| Energy-Save Mode Current (ICC(energy-save)) | 140 | 160 | 180 | μA |
| Gate Pull-Down Resistance (Rpd(G)) | 3.2 | 4 | 5 | Ω |
| Driver Activation Voltage (Vact(drv)) | - | - | - | V |
| Package Type | - | - | - | SO8 |
Key Features
- Adaptive Gate Drive: Ensures maximum efficiency at any load condition.
- Low No-Load Supply Current: Below 200 μA in no-load operation.
- Wide Supply Voltage Range: From 4.5 V to 38 V.
- Dual Synchronous Rectification: Supports LLC resonant and multi-output flyback converters.
- Support for 5 V Operation: Compatible with logic level SR MOSFETs.
- Differential Inputs: For sensing the drain and source voltages of each SR MOSFET.
- No Minimum On-Time Requirement: SR control without minimum on-time constraints.
- Adaptive Gate Drive for Fast Turn-Off: Ensures efficient turn-off at the end of conduction.
- UnderVoltage LockOut (UVLO): With active gate pull-down for safety.
Applications
The TEA1995T and its demonstration board, TEA1995DB1294UL, are designed for use in various power supply applications, including:
- LLC resonant converters.
- Multi-output flyback converters.
- High-efficiency switched mode power supplies.
- Power supplies requiring synchronous rectification on the secondary side.
Q & A
- What is the primary function of the TEA1995T?
The TEA1995T is a controller IC for synchronous rectification on the secondary side of resonant converters.
- What is the supply voltage range of the TEA1995T?
The supply voltage range is from 4.5 V to 38 V.
- What type of package does the TEA1995T come in?
The TEA1995T comes in an SO8 package.
- Does the TEA1995T support 5 V operation?
- What is the purpose of the UnderVoltage LockOut (UVLO) feature?
The UVLO feature ensures the IC enters a safe state when the supply voltage drops below a certain threshold, with active gate pull-down.
- How does the adaptive gate drive feature work?
The adaptive gate drive feature ensures maximum efficiency at any load condition by adjusting the gate drive accordingly.
- What are the typical applications of the TEA1995T?
The TEA1995T is typically used in LLC resonant converters, multi-output flyback converters, and other high-efficiency switched mode power supplies.
- How do you connect the TEA1995DB1294 demo board?
The demo board connections include connecting the drain lines to the secondary outputs of the transformer, the GND connection to the power ground, and the VCC connection to the Vout terminal of the main board.
- What is the significance of the differential inputs on the TEA1995T?
The differential inputs are used for sensing the drain and source voltages of each SR MOSFET, ensuring accurate control.
- Does the TEA1995T have any safety features?
