UCC28730-Q1

• AEC-Q100 Qualified for Automotive Applications:
  • Device Temperature Grade 1: –40⁰C to +125⁰C
  • Device HBM Classification Level 2: ±2 kV
  • Device CDM Classification Level C4B: ±750 V
• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• Enables Zero-Power (< 5 mW) Standby Consumption
• Primary-Side Regulation (PSR) Eliminates Opto-coupler
• ±5% Voltage Regulation and Current Regulation Across Line and Load
• 700-V Start-up Switch with 30-V Minimum Start-up Voltage
• 83-kHz Maximum Switching Frequency Enables Low Stand-by Power Charger Designs
• Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
• Frequency-Dither to Ease EMI Compliance
• Clamped Gate-Drive Output for MOSFET
• Over-Voltage, Low-Line, and Over-Current Protection Functions
• Programmable Cable Compensation
• SOIC-7 Package

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The UCC28730-Q1 isolated-flyback power supply controller provides constant-voltage (CV) and constant-current (CC) output regulation without the use of an optical coupler. A minimum switching frequency of 30 Hz achieves less than 5 mW of no-load power.

This device processes information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.

An internal 700-V start-up switch, dynamically- controlled operating states and a tailored modulation profile support ultra-low stand-by power without sacrificing start-up time or output transient response. Control algorithms in the UCC28730-Q1 allow operating efficiencies to meet or exceed applicable standards. Discontinuous conduction mode (DCM) operation with valley-switching reduces switching losses. Modulation of the switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.