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UCC24612

ACTIVE

High-frequency multi-mode synchronous rectifier controller

Product details

Topology Active-clamp flyback, Active-clamp forward, CCM, DCM, Forward, Full bridge, Half bridge, LLC, Quasi resonant UVLO thresholds on/off (V) 4.5/4 Switching frequency (max) (kHz) 1000 Features 1 MHz operation, 800 kHz operation, Adaptive Minimum Off-time, Automatic light load and sleep mode, High or low-side configurable, Proportional gate drive, Synchronous Rectifier, USB C/PD compatible Operating temperature range (°C) -40 to 125 Control mode VDS sensing Device type Controllers Rating Catalog
Topology Active-clamp flyback, Active-clamp forward, CCM, DCM, Forward, Full bridge, Half bridge, LLC, Quasi resonant UVLO thresholds on/off (V) 4.5/4 Switching frequency (max) (kHz) 1000 Features 1 MHz operation, 800 kHz operation, Adaptive Minimum Off-time, Automatic light load and sleep mode, High or low-side configurable, Proportional gate drive, Synchronous Rectifier, USB C/PD compatible Operating temperature range (°C) -40 to 125 Control mode VDS sensing Device type Controllers Rating Catalog
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8
  • Supports Topologies such as Active Clamp Flyback, QR, DCM, CCM Flyback and LLC
  • MOSFET VDS Sensing up to 230 V
  • Operating Frequency Up to 1 MHz
    • 1 MHz for UCC24612-1
    • 800 kHz for UCC24612-2
  • Wide VDD Range Allows for Direct Bias from 5-V to 28-V Output Systems
  • 4-A Sink, 1-A Source Gate Driver with Proportional Gate Drive
  • Adaptive Minimum Off-time for Increased Noise Immunity
  • Cycle Limit Pre-Turn-off Improves Efficiency in CCM
  • High or Low-Side Configurable
  • Automatic Light-Load and Sleep-Mode Management with 320-µA standby current
  • 16-ns Typical Turnoff Propagation Delay
  • 9.5-V Gate Drive Clamp for Reduced Driving Loss
  • Supports Topologies such as Active Clamp Flyback, QR, DCM, CCM Flyback and LLC
  • MOSFET VDS Sensing up to 230 V
  • Operating Frequency Up to 1 MHz
    • 1 MHz for UCC24612-1
    • 800 kHz for UCC24612-2
  • Wide VDD Range Allows for Direct Bias from 5-V to 28-V Output Systems
  • 4-A Sink, 1-A Source Gate Driver with Proportional Gate Drive
  • Adaptive Minimum Off-time for Increased Noise Immunity
  • Cycle Limit Pre-Turn-off Improves Efficiency in CCM
  • High or Low-Side Configurable
  • Automatic Light-Load and Sleep-Mode Management with 320-µA standby current
  • 16-ns Typical Turnoff Propagation Delay
  • 9.5-V Gate Drive Clamp for Reduced Driving Loss

UCC24612 is a high performance synchronous rectifier controller and driver for standard and logic-level N-channel MOSFET power devices. By implementing a near-ideal diode emulation UCC24612 reduces losses of the output rectifier and indirectly the primary side losses. The drain to source (VDS) sensing control scheme allows UCC24612 to work with multiple topologies, such as Active Clamp Flyback, QR/DCM/CCM Flyback and LLC, et.

Integrated features simplify the design effort, enabling UCC24612 to excel in a variety of applications and frequencies. The wide operating VDD and VD voltage ranges enable simple implementation in systems with outputs up to 28 V. Efficiency and noise immunity is enhanced with adaptive minimum off-time. Variants UCC24612-1 and UCC24612-2 offer different minimum on-times to provide additional noise immunity. Robust operation in continuous conduction mode (CCM) is further enhanced with proportional gate-drive and CCM cycle limit pre-turn-off.

UCC24612 has multiple features that improve efficiency. The fast comparator with short propagation delays reduces switching loss. The 9.5-V gate drive clamp reduces MOSFET driving losses. Frequency dependent standby modes further decreases standby power. These features help UCC24612 be part of a greater system that meets stringent efficiency standards such as Department of Energy (DoE) Level VI and Code of Conduct (CoC) Tier 2.

UCC24612 is available in a SOT23-5 package.

UCC24612 is a high performance synchronous rectifier controller and driver for standard and logic-level N-channel MOSFET power devices. By implementing a near-ideal diode emulation UCC24612 reduces losses of the output rectifier and indirectly the primary side losses. The drain to source (VDS) sensing control scheme allows UCC24612 to work with multiple topologies, such as Active Clamp Flyback, QR/DCM/CCM Flyback and LLC, et.

Integrated features simplify the design effort, enabling UCC24612 to excel in a variety of applications and frequencies. The wide operating VDD and VD voltage ranges enable simple implementation in systems with outputs up to 28 V. Efficiency and noise immunity is enhanced with adaptive minimum off-time. Variants UCC24612-1 and UCC24612-2 offer different minimum on-times to provide additional noise immunity. Robust operation in continuous conduction mode (CCM) is further enhanced with proportional gate-drive and CCM cycle limit pre-turn-off.

UCC24612 has multiple features that improve efficiency. The fast comparator with short propagation delays reduces switching loss. The 9.5-V gate drive clamp reduces MOSFET driving losses. Frequency dependent standby modes further decreases standby power. These features help UCC24612 be part of a greater system that meets stringent efficiency standards such as Department of Energy (DoE) Level VI and Code of Conduct (CoC) Tier 2.

UCC24612 is available in a SOT23-5 package.

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Technical documentation

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Type Title Date
* Data sheet UCC24612 High Frequency Synchronous Rectifier Controller datasheet (Rev. A) PDF | HTML 13 Feb 2018
Technical article 高頻共振轉換器設計考量,第 2 部分 PDF | HTML 15 Mar 2024
Technical article 고주파 공진 컨버터 설계 고려 사항, 2부 PDF | HTML 15 Mar 2024
Technical article High-frequency resonant converter design considerations, Part 2 PDF | HTML 21 Dec 2023
More literature PCB layout guidelines to optimize power supply performance 23 Mar 2021
Technical article Gain ultra-high power density for 100-W USB Power Delivery adapters PDF | HTML 05 Mar 2019
Technical article How topology selection can help improve reliability in industrial AC/DC power supp PDF | HTML 14 Feb 2019
Technical article Intelligently control an active clamp flyback PDF | HTML 01 Mar 2018
Application note UCC24610 and UCC24612 SR Range Extension Guide 18 Dec 2017
EVM User's guide Using the UCC24612-1EVM 16 May 2017

Design & development

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

Evaluation board

UCC28780EVM-002 — UCC28780 active clamp flyback 45W AC/DC EVM with GaN FET

The UCC28780EVM-002 demonstrates high-efficiency and high-density for a 45-W off-line adapter using the UCC28780 active-clamp flyback controller at high frequency nominal 300 kHz using GaN MOSFET Power ICs, NV6115 and NV6117.  The EVM also uses the UCC24612 synchronous rectifier controller on (...)

User guide: PDF
Not available on TI.com
Evaluation board

UCC28780EVM-021 — UCC28780 active clamp flyback converter 45W EVM with UCC24612 and Si MOSFET

The UCC28780EVM-021 is a 45-W evaluation module (EVM) for evaluating an off-line active-clamp flyback adapter for notebook charging and other applications. The EVM meets CoC Tier 2 and DoE Level 6 efficiency requirements. It is intended for evaluation purposes and is not intended to be an end (...)

User guide: PDF
Not available on TI.com
Daughter card

UCC24612-1EVM — Secondary-side synchronous rectifier controller diode-replacement demonstration board

The UCC24612-1EVM evaluation module (EVM) is used to convert the output rectifier of a flyback converter from a diode to a synchronous rectifier (SR) FET to investigate and evaluate the efficiency benefits of using an SR over a rectifier diode.
User guide: PDF
Not available on TI.com
Simulation model

UCC24612 SIMPLIS Model (Rev. A)

SLUM597A.ZIP (491 KB) - SIMPLIS Model

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Package Pins Download
SOT-23 (DBV) 5 View options

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