Looking for a 100 mA full H-bridge driver in one chip. - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: February 20, 2018, 06:55:56 pm
content: Two bridges in one chip is even better.This is to drive a small 2 winding stepper motor.I’m trying to avoid building two bridges with 8 discrete transistors.A quad op-amp with output drive capability might be ideal, if such a device exists.Any suggestions on how to do this?

author: MasterT
author_rank: Frequent Contributor
timestamp: February 20, 2018, 07:22:06 pm
content: ULN2803, perhaps? Or L293/L298, TB6612, L9110.

author: Zero999
author_rank: Super Contributor
timestamp: February 20, 2018, 08:28:10 pm
content: The SN754410.http://www.ti.com/lit/ds/symlink/sn754410.pdfWhat's the supply voltage?

author: AndersJ
author_rank: Frequent Contributor
timestamp: February 21, 2018, 07:05:44 am
content: Aiming for < 4V, but since this driver is otherwise perfect I mayneed to step up and use a 6 or 12 Volt motor.Thanks for your suggestion.

author: Zero999
author_rank: Super Contributor
timestamp: February 21, 2018, 08:58:55 am
content: Quote from: AndersJ on February 21, 2018, 07:05:44 amYes, there will be a voltage drop across the driver transistors.All the ICs suggested so far are not specified to work below 5V, except the L9110. The devices with BJTs have too higher voltage drop, for low supply voltage applications.How about the DRV8836?http://www.ti.com/lit/ds/symlink/drv8836.pdfIs this going to be hand soldered or are you going to use a reflow oven? The DRV8836 has a thermal pad, which can't be hand soldered.An alternative is the LB1938FA, but it's only one H-bridge.http://www.onsemi.com/pub/Collateral/ENA2041-D.PDFThe TC78H620FNG is another possibility, which is surface mount, but doesn't have a thermal pad, so is fairly easy to hand solder.https://toshiba.semicon-storage.com/info/docget.jsp?did=35802&prodName=TC78H620FNG

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 21, 2018, 09:30:53 am
content: https://www.digikey.co.uk/products/en/integrated-circuits-ics/pmic-full-half-bridge-drivers/746?k=full+bridge+motor&k=&pkeyword=full+bridge+motor&pv255=150&pv255=151&pv255=188&pv255=187&pv255=134&pv255=147&pv255=135&pv255=143&pv255=139&FV=ffe002ea%2C4500467%2C4500072%2C4500074%2C4500085%2C450055e%2C450000f%2C4500096%2C45005e5%2C45005ed%2C4500098%2C4500010%2C4500011%2C45007f9%2C45000d2%2C45000de%2C4500017%2C4500962%2C4500a98%2C4500124%2C4500c9a%2C4500ce5%2C4500cf6%2C4500d32%2C4500d3a%2C450015b%2C4500164%2C4500e08%2C450018b%2C450101e%2C45001a0%2C45001b6%2C45002df%2C450004f%2C450032f%2C450039e%2C45003e7&quantity=0&ColumnSort=0&page=1&stock=1&pageSize=25Allegro A3909 looks goodhttps://www.digikey.co.uk/product-detail/en/allegro-microsystems-llc/A3909GLYTR-T/620-1499-6-ND/3979661Dual full-bridge, 4-12V 1A

author: Vic20
author_rank: Contributor
timestamp: February 21, 2018, 10:12:44 am
content: Quote from: Hero999 on February 21, 2018, 08:58:55 amI have used this one. Good driver.The JSON package is a pain to hand solder.

author: AndersJ
author_rank: Frequent Contributor
timestamp: February 22, 2018, 02:21:57 am
content: Thanks for all suggestions.Now I need to generate the driver input signals for a full step bipolar stepper motor.I planned to avoid a microcontroller, since the clock is already available,and instead use a 2 bit counter with appropriate output decoding.I have a solution based on a HC194 based circulating shift registerbut it needs a complexity driving initial parallell load that must be preserved during operation.A static decoder on the output is more reliable, but I can’t figure out how to design it.

author: AndersJ
author_rank: Frequent Contributor
timestamp: February 22, 2018, 06:25:05 am
content: The current design uses such a chip, the now obsolete MC3479P.I want to replace it with a modern equivalent.But I have not found one, only the various H bridges suggested in this thread.A driver with STEP and DIR is what I need.But I can’t find one.If such chips are available, please point me in the right direction.