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Recommendation for simple buck boost converter to drive solenoid with 13-15VDC from 12 or 24VDC input.

Henry Zagara
Prodigy 30 points
Other Parts Discussed in Thread: TPS55165-Q1, TPS55288, DRV120, TPS61175, TPS55340EVM-147, TPS55340

Hi,

Solenoid is rated: 12 VDC, 60.2 Ohm, 2.5W, 199mA

Application is in high security door locks, which are powered from either 12V or 24V  depending on existing access control systems.  Original design was to drive solenoid directly for 12V installations and use a simple dropping (i.e. current limiting) resistor for 24V applications.  However testing has shown that at 12V solenoid does not provide enough pull force to reliably retract plunger.  Reliable actuation can be achieved with 13-15V.  Per solenoid manufacturer solenoid can be operated continuously at up to 15V.

 So I am looking for a simple, small footprint DC-DC converter which will accept either a 12 or 24V input and produce a fixed 13-15V output at about .3A max.

 I have done some testing with an inexpensive "DC-DC Boost Buck adjustable step up down Converter Module" which are available all over EBay, Amazon, etc...   These are based on an XL6009 regulator from XLSEMI configured as what to me looks like a SEPIC topology.  This module seems to work ok, and I have found a schematic as well as the datasheet for the XL6009.  However I do not see much info regarding the XLSEMI brand, nor does it appear to be available through typical distribution channels.

 Module ref. link below: "DC-DC 1.5V - 35V Adjustable Boost Buck Step Up / Down XL6009 Converter Module"

 https://www.ebay.com/itm/DC-DC-1-5V-35V-Adjustable-Boost-Buck-Step-Up-Down-XL6009-Converter-Module-/192019886845

Note only load is the solenoid plus a couple status LED's.  No other active electronics where noise or ripple would be a concern.

Estimated available PCB space is approx. 2.25 sq. in.

Can you recommend any TI parts or designs to consider as a solution for this requirement?

Any advise you can provide greatly appreciated.

Thanks,

Henry (Hank) Zagara

Z-TECH EMS (Electronics Manufacturing Support)

3 Manlon Terrace

Cheektowaga, NY 14225

716-465-6990

hank.ztech@roadrunner.com

  • 0
    TI__Mastermind 40080 points

    Dear Sir,

    The simplest solution is use TPS55165-Q1,  but its output is only 12V. Not sure if 12V is OK for the solenoid?

    If 13V is a must, suggest them use use TPS55288, our new part, this part will RTMed in April.

    What will be the volume of your project? We can have a discuss through email.

  • 0 in reply to Helen chen
    Prodigy 30 points

    Hi Helen,

    12V output would not be enough.  Testing is showing maybe up to 15V output required to reliably actuate our solenoid.

    Input will be either 12V or 24V depending on access control system installed at location.  Both are common supply voltages found in access control systems, but typically a given installation will use one or the other.  My customers product (high security door lock) must accommodate either voltage.

    I was initially considering a circuit using TI's DRV120, PWM current driver for solenoids.
    However it was then discovered that in applications with only 12V input available even with 100% duty cycle the solenoid would not produce enough strength to reliably actuate in our application.
    My customer would prefer a design which can accept either the 12V or 24V input using a single common input terminal.  So basically I need a single circuit to output say 14-15V for an input of either 12V or 24V.  For 12V function would be "step up", for 24V would be "step down".

    EAU is 5000-7500 units.

    Thank you for your response, and any further help you can provide!

    Hank Z.

  • 0 in reply to Henry Zagara
    TI__Mastermind 40080 points

    Dear Sir,

    You can use our new device TPS55288, this device will be RTMed in April. If you can't wait, you can also use TPS61175 in Sepic topology.

    For the circuit, please refer to TPS55340EVM-147, just change the TPS55340 with TPS61175, then choose  a 3A rating coupling inductor which has smaller size.