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UCC28740-Q1
Automotive ultra low standby, flyback controller with integrated HV startup and optocoupler feedback
Data sheet
UCC28740-Q1
- Qualified for automotive applications
- AEC-Q100 qualified with the following results:
- Device temperature grade 1: -40.C to +125.C
- Device HBM classification level 2: ±2 kV
- Device CDM classification level C4B: ±750 V
- Funcitonal Safety-Capable
- Documentation available to aid functional safety system design
- Less than 10-mW no-load power capability
- Enables ±1% voltage regulation and ±5% current regulation across line and load
- 700-V startup switch
- 100-kHz maximum switching frequency enables high-power-density charger designs
- Resonant-ring valley-switching operation for highest overall efficiency
- Frequency dithering to ease EMI compliance
- Clamped gate-drive output for MOSFET
- Overvoltage, low-line, and over current protection functions
- Create a custom design using the UCC28740-Q1 with the WEBENCH Power Designer
The UCC28740-Q1 isolated-flyback power-supply controller regulates the output using an optical coupler to provide fast transient response to large-load steps.
An internal 700-V startup switch, dynamically controlled operating states, and a tailored modulation profile support ultra-low standby power without sacrificing startup time or output transient response.
Control algorithms in the UCC28740-Q1 allow operating efficiencies to meet or exceed applicable standards. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.
The controller has a maximum switching frequency of 100 kHz and always maintains control of the peak-primary current in the transformer. Protection features keep primary and secondary component stresses in check. A minimum switching frequency of 170 Hz facilitates the achievement of less than 10-mW no-load power.
Technical documentation
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View all 6 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC28740-Q1 Ultra Low Standby, Flyback Controller for Automotive, with Integrated HV Startup and Optocoupler Feedback datasheet (Rev. C) | PDF | HTML | 08 Dec 2020 |
| White paper | Isolated Bias Power Supply Architecture for HEV and EV Traction Inverters | PDF | HTML | 11 Oct 2023 | |
| Application brief | Designing a Robust Traction Inverter Redundant Power Supply From 800 V Battery (Rev. C) | PDF | HTML | 16 Feb 2023 | |
| Functional safety information | UCC28740-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 11 Nov 2020 | |
| Application note | Minimize Standby Consumption for UCC287XX Family | 01 Aug 2019 | ||
| Analog Design Journal | Agency requirements for stand-by power consumption w/ offline and PoL converters | 26 Jan 2016 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
UCC28740EVM-525 — UCC28740EVM-525 Evaluation Module
The UCC28740EVM-525 evaluation module is a 10W off-line discontinuous mode (DCM) flyback converter that provides constant-voltage (CV) and constant-current (CC) output regulation. It uses optical coupler feedback for tight voltage regulation and improved the transient response to large load steps (...)
User guide: PDF
Reference designs
PMP41009 — 350-V to 1000-V DC input, 56-W flyback isolated power supply reference design
This reference design provides isolated 14-V and 56-W outputs with a quasi-resonant flyback topology. The power supply can be powered from the 350-V to 1000-V DC input. This design uses cascode MOSFETs and flyback controller UCC28740-Q1. The line and load regulation are regulated to within ±1% (...)
Test report: PDF
| Package | Pins | Download |
|---|---|---|
| SOIC (D) | 7 | View options |
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