12-VAC to 28-VAC, 7.5-W to 25-W ideal diode full-bridge rectifier reference design
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Key Document


This reference design implements the LM74610-Q1 zero IQ reverse polarity protection smart diode controller to control the high-side rectifier MOSFETs for both line and neutral inputs of a 12-VAC to 28-VAC power supply. The design was tested at loads from 7.5 W to 25 W. The use of low Rdson MOSFETs with ideal diode drivers eliminates the high losses found in standard diode rectifiers. Applications are video doorbells and smart thermostats that run off of a home or building 12-V or 24-V AC transformer.

  • Increased efficiency of AC rectifier due to replacement of diodes with MOSFETs
  • Tested at loads from 7.5 W to 25 W

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)1212
Vin (Max) (V)2828
Vout (Nom) (V)1228
Iout (Max) (A)2.1.9
Output Power (W)25.225.2
Input TypeACAC
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Part Number Status Vin  (Min)  (V)   Vin  (Max)  (V)   Vout  (Nom)  (V)   Iout  (Max)  (A)   Output Power  (W)   Isolated/Non-Isolated   Input Type   Topology  

Output Voltage 1-Other

ACTIVE 12   28   28   .9   25.2   Non-Isolated   AC   Other  

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD88539ND  60-V, N channel NexFET™ power MOSFET, dual SO-8, 28 mOhm  MOSFETs  Sample & Buy Not Available
LM74610-Q1  0.48-V to 42-V, zero IQ automotive ideal diode controller  Power switches  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD88539ND Download
LM74610-Q1 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 817 20 Aug 2020
Design files (6)
Title Type Size (KB) Date
ZIP 268 21 Aug 2020
ZIP 3790 21 Aug 2020
PDF 236 21 Aug 2020
PDF 93 21 Aug 2020
PDF 89 21 Aug 2020
PDF 175 21 Aug 2020
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
LM74610-Q1 evaluation board   LM74610-SQEVM  Evaluation board 

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