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DCR012405 Datasheet(PDF) 11 Page - Texas Instruments |
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DCR012405 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 28 page SYNC +VS ENABLE ERROR -VS VREC LDO Regulator -VOUT +VOUT Oscillator 800 kHz Divide-by-2 Reset Watchdog Startup PSU Thermal Shutdown Power Stage Input Controller Copyright © 2016, Texas Instruments Incorporated 11 DCR010503, DCR012405, DCR010505 DCR011203, DCR011205, DCR012403 www.ti.com SBVS013D – OCTOBER 2001 – REVISED JUNE 2016 Product Folder Links: DCR010503 DCR012405 DCR010505 DCR011203 DCR011205 DCR012403 Submit Documentation Feedback Copyright © 2001–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The DCR01 series of power modules offer isolation from a regulated power supply operating from a choice of input voltages. The DCR01s provide a regulated 3.3-V or 5-V output voltage at a nominal output power of 1 W or above. The DCR01 devices include a low dropout linear regulator internal to the device to achieve a well- regulated output voltage. The DCR01 devices are specified for operational isolation only. The circuit design uses an advanced BiCMOS/DMOS process. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Isolation Underwriters Laboratories, UL™, defines several classes of isolation that are used in modern power supplies. Safety extra low voltage (SELV) is defined by UL (UL1950 E199929) as a secondary circuit which is so designated and protected that under normal and single fault conditions the voltage between any two accessible parts, or between an accessible part and the equipment earthing terminal for operational isolation does not exceed steady state 42.4 VRMS or 60 VDC peak. 8.3.1.1 Operation or Functional Isolation The type of isolation used in the DCR01 products is referred to as operational or functional isolation. Insulated wire used in the construction of the transformer acts as the primary isolation barrier. A high-potential (hipot), one- second duration test (dielectric voltage, withstand test) is a production test used to verify that the isolation barrier is functioning. Products with operational isolation must never be used as an element in a safety-isolation system. 8.3.1.2 Basic or Enhanced Isolation Basic or enhanced isolation is defined by specified creepage and clearance limits between the primary and secondary circuits of the power supply. Basic isolation is the use of an isolation barrier in addition to the insulated wire in the construction of the transformer. Input and output circuits must also be physically separated by specified distances. |
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