Product details

Topology LLC, Phase-Shifted Full-bridge Operating temperature range (C) -40 to 125
Topology LLC, Phase-Shifted Full-bridge Operating temperature range (C) -40 to 125
WSON (DRS) 6 9 mm² 3 x 3
  • Low-Side Gate Driver With Body-Diode
    Conduction Sensing
  • Gate Turnoff Edge Body-Diode Conduction
    Reporting
  • Gate Turnon Edge Delay Optimization
  • Works Together With the Dead-Time
    Compensation (DTC) Module in the UCD3138A
    Family of Digital Power Controllers:
    • Automatic or Manual Dead-Time Adjustment of
      Gate Turnon and Turnoff Edges
    • Negative Current Protection
  • –150-mV Body-Diode Conduction Sensing
    Threshold
  • Able to Sense Body Diode Conduction Times as
    Low as 10 ns
  • 4-A Peak-Source and 6-A Peak-Sink Drive
    Current
  • Fast Propagation Delays (14-ns Typical)
  • Fast Rise and Fall Times (5-ns Typical)
  • Up to 2-MHz Operating Frequency
  • 4.5-V to 18-V Supply Range
  • Rail-to-Rail Drive Capability
  • VCC Undervoltage Lockout (UVLO)
  • 6-Pin 3-mm × 3-mm WSON-6 Package
  • Low-Side Gate Driver With Body-Diode
    Conduction Sensing
  • Gate Turnoff Edge Body-Diode Conduction
    Reporting
  • Gate Turnon Edge Delay Optimization
  • Works Together With the Dead-Time
    Compensation (DTC) Module in the UCD3138A
    Family of Digital Power Controllers:
    • Automatic or Manual Dead-Time Adjustment of
      Gate Turnon and Turnoff Edges
    • Negative Current Protection
  • –150-mV Body-Diode Conduction Sensing
    Threshold
  • Able to Sense Body Diode Conduction Times as
    Low as 10 ns
  • 4-A Peak-Source and 6-A Peak-Sink Drive
    Current
  • Fast Propagation Delays (14-ns Typical)
  • Fast Rise and Fall Times (5-ns Typical)
  • Up to 2-MHz Operating Frequency
  • 4.5-V to 18-V Supply Range
  • Rail-to-Rail Drive Capability
  • VCC Undervoltage Lockout (UVLO)
  • 6-Pin 3-mm × 3-mm WSON-6 Package

The UCD7138 device is a 4-A and 6-A single-channel MOSFET driver with body-diode conduction sensing and reporting and is a high performance driver that allows the Texas Instruments UCD3138A digital PWM controller to achieve advanced synchronous-rectification (SR) control. The device contains a high-speed gate driver, a body-diode conduction-sensing circuit, and a turnon delay optimization circuit. The device is suitable for high-power, high-efficiency isolated converter applications where SR dead-time optimization is desired.

The UCD7138 device offers asymmetrical rail-to-rail 4-A source and 6-A sink peak-current drive capability. The short propagation delay and fast rise and fall time allows efficient operation at high frequencies. An internal high-speed comparator with a –150-mV threshold detects the body-diode conduction and reports the information to the UCD3138A digital-power controller. The UCD7138 device is capable of sensing body-diode conduction time as low as 10 ns. The SR turnon edge is optimized by the UCD7138 device. The SR turnoff edge is optimized by the UCD3138A digital-power controller which analyzes the body-diode conduction information reported by the UCD7138 DTC pin.

The benefits of the chipset include maximizing system efficiency by minimizing body-diode conduction time, robust and fast negative-current protection, and a simple interface.

The UCD7138 device is a 4-A and 6-A single-channel MOSFET driver with body-diode conduction sensing and reporting and is a high performance driver that allows the Texas Instruments UCD3138A digital PWM controller to achieve advanced synchronous-rectification (SR) control. The device contains a high-speed gate driver, a body-diode conduction-sensing circuit, and a turnon delay optimization circuit. The device is suitable for high-power, high-efficiency isolated converter applications where SR dead-time optimization is desired.

The UCD7138 device offers asymmetrical rail-to-rail 4-A source and 6-A sink peak-current drive capability. The short propagation delay and fast rise and fall time allows efficient operation at high frequencies. An internal high-speed comparator with a –150-mV threshold detects the body-diode conduction and reports the information to the UCD3138A digital-power controller. The UCD7138 device is capable of sensing body-diode conduction time as low as 10 ns. The SR turnon edge is optimized by the UCD7138 device. The SR turnoff edge is optimized by the UCD3138A digital-power controller which analyzes the body-diode conduction information reported by the UCD7138 DTC pin.

The benefits of the chipset include maximizing system efficiency by minimizing body-diode conduction time, robust and fast negative-current protection, and a simple interface.

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Technical documentation

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Type Title Date
* Data sheet UCD7138 4-A and 6-A Single-Channel Synchronous-Rectifier Driver With Body-Diode Conduction Sensing and Reporting datasheet (Rev. B) PDF | HTML 13 May 2015
Application note Intelligent LLC SR Control Using C2000 and UCD7138 (Rev. A) PDF | HTML 27 Jun 2022
Technical article Power Tips: How GaN devices boost resonant converter efficiency 25 Aug 2016
EVM User's guide Using the UCD3138ALLCEVM150 (Rev. A) 14 Jan 2016
Application note Using UCD7138 and UCD3138A for Advanced Synchronous Rectification Control (Rev. B) 23 Oct 2015
Technical article Is your power supply smart enough to be cool 21 May 2015
Technical article GaN is Ready For Digital Power Control 20 Mar 2015
Technical article Don’t "brick" my supply! 17 Mar 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

UCD3138ALLCEVM150 — UCD3138A LLC Evaluation Module

The UCD3138ALLCEVM150 is an evaluation module (EVM) board, functioning as an LLC resonant half-bridge dc-dc converter and digitally controlled by control card UCD3138ACCEVM149. This EVM is used to evaluate digital power control using UCD3138A in LLC resonant half-bridge dc-dc conversion (...)

User guide: PDF
Not available on TI.com
Simulation model

UCD7138 PSpice Transient Model

SLVMAT7.ZIP (77 KB) - PSpice Model
Reference designs

PMP20978 — High Efficiency and Power Density 1kW Resonant Converter Reference Design with High Voltage GaN FET

The PMP20978 reference design is a high efficiency, high power density and light weight resonant converter reference design. It converts a 390V input to a 48V/1kW output. The PMP20637 power stage has over 140W/in^3 power density. The whole board weight is less than 230g. With fixed 950kHz (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDM-1001 — Two Phase Interleaved LLC Resonant Converter Reference Design Using C2000™ MCUs

Resonant converters are popular DC-DC converters frequently used in server, telecom, automotive, industrial and other power supply applications. Their high performance (efficiency, power density, etc.), improving requirements of the various industry standards, and the ever increasing power density (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP20289 — 400V – 12V/500W High Frequency Resonant Converter Reference Design Using High Voltage GaN Devices

The PMP20289 was built and tested to verify the performance of a high frequency (>400kHz nominal switching frequency) LLC series resonant converter (LLC-SRC) implemented with Texas Instrument’s high voltage GaN FETs under nominal (390V to 12V) voltage conversion. The digital controller (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP20637 — High Efficiency and High Power Density 1kW Resonant Converter Reference Design with TI HV GaN FET

This reference design is a high efficiency, high power density and light weight resonant converter reference design. It converts a 390V input to a 48V/1kW output. The PMP20637 power stage has over 140W/in^3 power density. The whole board weight is less than 210g. With fixed 950kHz switching (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP21309 — 24-V/500-W resonant converter reference design with HV GaN FET

This reference design is a high-frequency resonant converter reference design. The output voltage is regulated to 24 V with input voltage ranges from 380 V to 400 V using a resonant tank with 500 kHz resonant frequency. A 97.9% peak efficiency is achieved with this design using TI’s (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP21842 — 12-V/500-W resonant converter reference design with HV GaN FET

This high-frequency resonant converter reference design regulates a 12-V output from a 380-V to 400-V input voltage range using a resonant tank with 500 kHz resonant frequency. A peak efficiency of 96.0% (bias supply included) is achieved with this design using our high-voltage GaN device along (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-00512 — 340W Digital Controlled LLC Resonant Half-Bridge DC-to-DC Power Conversion Reference Design

This design is a LLC resonant half-bridge DC-DC power converter with digital control using 3138ACC32EVM-149 daughter-card. The daughter-card control functions with preloaded firmware providing the required control functions for a LLC resonant half-bridge converter.  The TIDA-00512 (...)
Test report: PDF
Schematic: PDF
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SON (DRS) 6 View options

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