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NXP TEA1721AT
HV start-up flyback controller with integrated MOSFET for 5 W applications, 905 Hz burst frequency
Overview
| Topology | Flyback Converter |
| Input voltage | 85-265 V |
| Switching frequency | 22.5-50.5 kHz |
| Output 1 | 3.3 V / 0.4 A |
| Output 2 | 12 V / 0.4 A |
| IC revision | 2.1 |
Description
The TEA1721 is a small and low cost module Switched Mode Power Supply (SMPS) controller IC for low power applications (up to 5 W) and operates directly from the rectified universal mains input. The device includes a high voltage power switch (700 V) and has been optimized for flyback converter topologies to provide high-efficiency over the entire load range with ultra-low power consumption in the no-load condition. It provides a circuitfor start-up directly from the rectified mains voltage without any external bleeder circuits.The converter operates as a regulated voltage source from no-load up to the maximum output current and operates as current source that delivers the maximum current over a broad output voltage range. Using the TEA1721, a low power converter can be built at minimum cost and with the minimum number of external components.The controller regulates the output voltage with primary-side sensing which eliminates the need for an additional secondary feedback circuitry and simplifies the design. At higher power levels, a frequency and current control mode is used. It operates with burst mode control at low power levels and no-load condition. The burst mode minimizes audiblenoise and provides an energy saver state which reduces the power consumption in no-load condition. The Burst mode frequency of 905 Hz enables no-load power consumption below < 20 mW at high mains input.
Features
- Low power SMPS controller with integrated power switch designed for applications up
- to 5 W700 V high voltage power switch for global mains operationPrimary sensing for control of the output voltage without optocoupler and secondary
- feedback circuitryMinimizes audible noise in all operation modesUSB battery charging and Energy Star 2.0 compliantJitter function for reduced EMIEnables no-load power consumption < 20 mWVery low supply current in no-load condition with energy saver modeIncorporates a high voltage start-up circuit with zero current consumption under
- normal switching operationAvailable in halogen-free and Restriction of Hazardous Substances (RoHS) SO7
- packageOverVoltage Protection (OVP) on Feedback control (FB) pin with auto-restartUnderVoltage LockOut (UVLO) protection on IC supply pinOverTemperature Protection (OTP)Soft-start by reduced peak current for zero and low output voltageDemagnetization protection for guaranteed discontinuous conduction mode operationOpen and short-circuit protection of the Feedback control (FB) pinShort-circuit protection of the charger output
Typical applications
- Power supply for white goods applications
- Battery chargers for cellular phones and other low power adapters up to 5 W
- Standby supply for TV and desktop PC
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | IR(A) | L(mH) | RDC max.(Ω) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TFC Common Mode Power Line Choke, 0.25 A, 25 mH | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TFC Common Mode Power Line Choke | Rated Current0.25 A | Inductance25 mH | DC Resistance3.6 Ω | Rated Voltage300 V (AC) | Insulation Test Voltage2500 V (AC) | MaterialMnZn | Length17 mm | Width11.5 mm | Height17 mm | MountTHT | ||||
750311993 | Offline Transformer WE-UNIT, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Offline Transformer WE-UNIT | – | – | – | – | – | – | – | – | – | – |