Automotive ultra low standby, flyback controller with integrated HV startup and optocoupler feedback
Product details
Parameters
Package | Pins | Size
Features
- 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
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Description
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
Type | Title | Date | |
---|---|---|---|
* | Datasheet | UCC28740-Q1 Ultra Low Standby, Flyback Controller for Automotive, with Integrated HV Startup and Optocoupler Feedback datasheet (Rev. C) | Dec. 08, 2020 |
Application note | UCC28740-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | Nov. 11, 2020 | |
Application note | Increase Traction Inverter System Robustness With a HV to LV Backup Supply (Rev. B) | Oct. 09, 2019 | |
Application note | Minimize Standby Consumption for UCC287XX Family | Aug. 01, 2019 | |
Application note | Agency requirements for stand-by power consumption w/ offline and PoL converters | Jan. 26, 2016 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
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 (...)
Features
- Universal AC input, 5V/2.1A output
- <20mW no load power
- Avg. efficiency > 80%
- Opto-Coupled Feedback for Constant Voltage Regulation and Fast Dynamic Response
- Primary Side Control for Tight Constant Current Performance (± 5% Output Current Regulation)
- Internal 700V Start-Up Switch to Start up the Supply (...)
Design tools & simulation
Reference designs
Design files
-
download TIDA-010071 BOM.pdf (115KB) -
download TIDA-010071 Assembly Drawing.pdf (370KB) -
download TIDA-010071 PCB.pdf (1548KB) -
download TIDA-010071 CAD Files.zip (3242KB) -
download TIDA-010071 Gerber.zip (401KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
SOIC (D) | 7 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
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