UCC28740-Q1 Texas instruments

UCC28740-Q1

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UCC28740-Q1

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Описание

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.

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

Topology	Flyback
Control mode	Secondary-side regulation
Switching frequency (max) (kHz)	100
Features	Current limiting, DCM, Error amplifier, Green mode, High-voltage startup, Input line monitor, Leading edge blanking, Light-load efficiency, Low power, SSR, Soft start, Valley switching
UVLO thresholds on/off (V)	21/7.75
Operating temperature range (°C)	-40 to 125
Rating	Automotive
Gate drive (typ) (A)	0.025
TI functional safety category	Functional Safety-Capable