Calculation tool
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
No results found. Please clear your search and try again.
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 | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (D) | 7 | Ultra Librarian |
Ordering & quality
Information included:
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.