Product details

Topology Active Clamp, Active Clamp Forward, CCM, DCM, Forward, Full-Bridge, Half-Bridge, LLC, Quasi-Resonant Frequency (Max) (kHz) 1000 UVLO thresholds on/off (V) 4.5/4 Supply voltage (Max) (V) 28 Features Synchronous Rectifier, Operation up to 1Mhz, Adaptive Minimum Off-time, High or low-side configurable, Automatic light load and sleep mode, Proportional gate drive Operating temperature range (C) -40 to 125
Topology Active Clamp, Active Clamp Forward, CCM, DCM, Forward, Full-Bridge, Half-Bridge, LLC, Quasi-Resonant Frequency (Max) (kHz) 1000 UVLO thresholds on/off (V) 4.5/4 Supply voltage (Max) (V) 28 Features Synchronous Rectifier, Operation up to 1Mhz, Adaptive Minimum Off-time, High or low-side configurable, Automatic light load and sleep mode, Proportional gate drive Operating temperature range (C) -40 to 125
SOT-23 (DBV) 5 5 mm² 2.9 x 1.6
  • 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) 13 Feb 2018
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 05 Mar 2019
Technical article How topology selection can help improve reliability in industrial AC/DC power supplies 14 Feb 2019
Technical article Intelligently control an active clamp flyback 01 Mar 2018
Technical article TI empowers design engineers at APEC 16 Feb 2018
Application note UCC24610 and UCC24612 SR Range Extension Guide 18 Dec 2017
User guide Using the UCC24612-1EVM 16 May 2017

Design & development

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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 (...)

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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 (...)

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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.
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Simulation model

UCC24612 SIMPLIS Model (Rev. A)

SLUM597A.ZIP (491 KB) - SIMPLIS Model
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SOT-23 (DBV) 5 View options

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