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
• 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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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.