LTE2426 problem - Page 1
Forum section: electronics / beginners

author: elki
author_rank: Regular Contributor
timestamp: November 24, 2023, 04:27:26 pm
content: Hello,I am trying to get + and - voltages from two batteries using TLE2426 with the following setup. Naively, I would expect the initial voltage to be split in two halves, however, I see a very asymmetric output. I am probably missing something very simple. Any ideas would be appreciated!

author: Jwillis
author_rank: Super Contributor
timestamp: November 24, 2023, 05:34:11 pm
content: Check this outhttps://e2e.ti.com/blogs_/b/powerhouse/posts/the-top-three-ways-to-split-a-voltage-rail-to-a-bipolar-supply

author: Zero999
author_rank: Super Contributor
timestamp: November 24, 2023, 05:57:53 pm
content: Is this in real life or a simulator?If it's a simulator, then it could be an issue with the model having internal nodes connected to 0V.Connect the negative side to 0V and create a new node, called centre, for the 0V. All plots will have to have V(centre) subtracted from them.I wish I had Googled. It is a problem with the model. Refer to the thread on the TI forum.https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1197958/tle2426-spice-model-doesn-t-work-in-floating-circuitsEDIT:Update:Here's an example schematic:Note that the output voltage is referenced to com, LTSpice's alternative to the ground 0 rail.

author: elki
author_rank: Regular Contributor
timestamp: November 24, 2023, 07:21:20 pm
content: Thanks a lot! This problem appeared in simulation only. Thanks for pointing me to that known issue with the model!

author: Zero999
author_rank: Super Contributor
timestamp: March 13, 2025, 07:35:48 pm
content: I found a bit of time to look at the model and fix it. I went through and changed all references to ground (node 0) to node 4. Now the output can be grounded, so long as the other connections are not. I've noticed the power supply wasn't modelled correctly in the original TI model, which I've not fixed.Code:*$* TLE2426x****************************************************************************** (C) Copyright 2022 Texas Instruments Incorporated. All rights reserved.******************************************************************************* This model is designed as an aid for customers of Texas Instruments.** TI and its licensors and suppliers make no warranties, either expressed** or implied, with respect to this model, including the warranties of** merchantability or fitness for a particular purpose. The model is** provided solely on an "as is" basis. The entire risk as to its quality** and performance is with the customer******************************************************************************* This model is subject to change without notice. Texas Instruments* Incorporated is not responsible for updating this model.********************************************************************************* Released by: Online Design Tools, Texas Instruments Inc.* Part: TLE2426x* Date: 09SEP2022* EVM Order Number: N/A* EVM Users Guide: N/A* Datasheet: SLOS098D - AUGUST 1991 - REVISED MAY 1998* Parts is a MicroSim product.** Model Version: Final 1.1******************************************************************************** Updates:** Zero999* Changed all references to ground (node 0) to common (node 4)* Now the output can be connected to 0V.** Final 1.1* 1. Updated PSpice Symbol.* 2. Added .ENDS name as TLE2426x.** Final 1.0* Release to Web.******************************************************************************* Model Usage Notes:* 1. Model file is updated with latest header.****************************************************************************** CONNECTIONS:* 1 FILTER* 3 INPUT* 4 COMMON* 5 OUTPUT.SUBCKT TLE2426 1 3 4 5*****************************************************************************C1 11 12 21.66E-12C2 6 7 30.00E-12C3 87 4 10.64E-9CPSR 85 86 15.9E-9DCM+ 81 82 DXDCM- 83 81 DXDC 5 53 DXDE 54 5 DXDLP 90 91 DXDLN 92 90 DXDP 4 3 DXECMR 84 99 (2,99) 1EGND 99 4 POLY(2) (3,4) (4,4) 0 .5 .5EPSR 85 4 POLY(1) (3,4) -16.22E-6 3.24E-6ENSE 89 2 POLY(1) (88,4) 120E-6 1FB 7 99 POLY(6) VB VC VE VLP VLN VPSR 0 74.8E6 -10E6 10E6 10E6 -10E6 74E6GA 6 4 11 12 320.4E-6GCM 4 6 10 99 1.013E-9GPSR 85 86 (85,86) 100E-6GRC1 4 11 (4,11) 3.204E-4GRC2 4 12 (4,12) 3.204E-4GRE1 13 10 (13,10) 1.038E-3GRE2 14 10 (14,10) 1.038E-3HLIM 90 4 VLIM 1KHCMR 80 1 POLY(2) VCM+ VCM- 0 1E2 1E2IRP 3 4 146E-6IEE 3 10 DC 24.05E-6IIO 2 4 .2E-9I1 88 4 1E-21Q1 11 89 13 QXQ2 12 80 14 QXR2 6 9 100.0E3RCM 84 81 1KREE 10 99 8.316E6RN1 87 4 2.55E8RN2 87 88 11.67E3RO1 8 5 63RO2 7 99 62VCM+ 82 99 1.0VCM- 83 99 -2.3VB 9 4 DC 0VC 3 53 DC 1.400VE 54 4 DC 1.400VLIM 7 8 DC 0VLP 91 4 DC 30VLN 4 92 DC 30VPSR 4 86 DC 0RFB 5 2 1KRIN1 3 1 400KRIN2 1 4 411K.MODEL DX D(IS=800.0E-18).MODEL QX PNP(IS=800.0E-18 BF=480).ENDS TLE2426

author: elki
author_rank: Regular Contributor
timestamp: March 13, 2025, 07:47:48 pm
content: Thanks a lot!