PMP7993.1: ±5V @ 100mA, ±15V @ 50mA, 17 ~ 32V in

Summary

The LM5017 Flybuck reference design provides multiple isolated outputs to supply the bias voltage needed in a PLC I/O module. It generates 4 isolated outputs: ±15V @ 50mA and ±5V @ 100mA; it can cover most of the required voltage rails in the I/O module, such as the OP-AMP, DAC bias, RS-485 transmitter and digital isolator power supplies.

In the Flybuck, the regulation is done on the primary side, and thus no opto-coupler is needed. The overall load/line regulation for each output is within +/-5%. The input voltage range is from 17V to 32V.

Specifications

Manufacturer Texas Instruments
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Multi Output
Eval Board Board not Stocked
Topology Step Down
Outputs and Type 4 Isolated
Voltage Out: Highest Current First ±5V, ±15V
Current Out 100mA, 50mA
Voltage In 17 ~ 32 V
Efficiency @ Conditions >70%, 32V in, 65 ~ 100% Load
>70%, 24V in, 55 ~ 100% Load
>70%, 17V in, 50 ~ 100% Load
Voltage Out Range - Fixed
Features Current Limit (Adj. or Fixed)
Shutdown, Enable, Standby
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 260 kHz
Standby Current [Typical] 50 µA
Quiescent Current [Typical] 1.75 mA
Component Count + Extras 32 + 11
Internal Switch Yes
Design Author Texas Instruments
Application / Target Market Automotive
Power: Auxiliary Power Supply
RF: Metering
Telecom
Standby Current [Maximum] 225 µA
Quiescent Current [Maximum] - Not Given
Main I.C. Base Part LM5017
Date Created By Author 2012-01
Date Added To Library 2014-11

Support Documents & Media

PMP7993.1 - User Guide PMP7993 - Bill of Materials LM5017 - Datasheet

Media

PMP7993.1_Schematic_Full.png PMP7993.1_Board_Full.jpg PMP7993.1_Chart_1_Full.png PMP7993.1_Chart_2_Full.png PMP7993.1_Chart_3_Full.png