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Product details

Parameters

Frequency (Max) (kHz) 2000 UVLO thresholds on/off (V) Features Operating temperature range (C) -40 to 125 open-in-new Find other Synchronous rectifier (SR) controllers

Package | Pins | Size

WSON (DRS) 6 9 mm² 3 x 3 open-in-new Find other Synchronous rectifier (SR) controllers

Features

  • 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
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Description

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
* Datasheet UCD7138 4-A and 6-A Single-Channel Synchronous-Rectifier Driver With Body-Diode Conduction Sensing and Reporting datasheet (Rev. B) May 13, 2015
Technical articles Power Tips: How GaN devices boost resonant converter efficiency Aug. 25, 2016
User guides Using the UCD3138ALLCEVM150 (Rev. A) Jan. 14, 2016
Application notes Using UCD7138 and UCD3138A for Advanced Synchronous Rectification Control (Rev. B) Oct. 23, 2015
Technical articles Is your power supply smart enough to be cool May 21, 2015
Technical articles GaN is Ready For Digital Power Control Mar. 20, 2015
Technical articles Don’t "brick" my supply! Mar. 17, 2015

Design & development

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

Hardware development

EVALUATION BOARDS Download
UCD3138A LLC Evaluation Module
UCD3138ALLCEVM150
document-generic User guide
$299.00
Description

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 (...)

Features
  • Digitally controlled LLC resonant half-bridge DC-DC power conversion DC line input from 350 to 400Vdc
  • Regulated output 12Vdc with output from no-load to full-load
  • Full-load power 340W, or full-load current 29A
  • Synchronous rectification
  • Constant Current/Constant Power control mode
  • Burst Mode (...)

Design tools & simulation

SIMULATION MODELS Download
SLVMAT7.ZIP (77 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
Two Phase Interleaved LLC Resonant Converter Reference Design Using C2000™ MCUs
TIDM-1001 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
400V – 12V/500W High Frequency Resonant Converter Reference Design Using High Voltage GaN Devices
PMP20289 — 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 (...)
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
High Efficiency and High Power Density 1kW Resonant Converter Reference Design with TI HV GaN FET
PMP20637 — 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 (...)
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
24-V/500-W resonant converter reference design with HV GaN FET
PMP21309 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
12-V/500-W resonant converter reference design with HV GaN FET
PMP21842 — 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 with (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Efficiency and Power Density 1kW Resonant Converter Reference Design with High Voltage GaN FET
PMP20978 — 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 switching (...)
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
340W Digital Controlled LLC Resonant Half-Bridge DC-to-DC Power Conversion Reference Design
TIDA-00512 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SON (DRS) 6 View options

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