UCC28740-Q1 Automotive ultra low standby, flyback controller with integrated HV startup and optocoupler feedback | TI.com

UCC28740-Q1
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Automotive ultra low standby, flyback controller with integrated HV startup and optocoupler feedback

 

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.

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
  • 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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WEBENCH® Designer UCC28740-Q1

 AC  DC  
AC Frequency  60 Hz  50 Hz
Use Isolated Output?
  Min   Max Range
VinRMS  V 60.00 to 480.00V
Vout  V 3.3 to 1000V
Iout  A ≤ 100A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Control method Duty cycle (Max) (%) Frequency (Max) (kHz) UVLO thresholds on/off (V) Features Operating temperature range (C) Package Group Rating Package size: mm2:W x L (PKG)
UCC28740-Q1 Order now Secondary-side regulation     99     100     21/7.75     SSR
HV Start-up
DCM
Low Power
Light Load Efficiency
Error Amplifier
Current Limiting
Green Mode
Input Line Monitor
Leading Edge Blanking    
-40 to 125     SOIC | 7     Automotive     7SOIC: 29 mm2: 6 x 4.9 (SOIC | 7)    
UCC28700-Q1 Order now Primary-side regulation     99     132     21/8     PSR
DCM
Low Power
Light Load Efficiency
Error Amplifier
Current Limiting
Green Mode
Input Line Monitor
Leading Edge Blanking    
-40 to 125     SOT-23 | 6     Automotive     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)    
UCC28730-Q1 Order now Primary-side regulation     99     83     21/7     PSR
DCM
HV Start-up
Low Power
Light Load Efficiency
Current Limiting
Thermal Shutdown
Green Mode
Input Line Monitor
Leading Edge Blanking
Soft Start    
-40 to 125     SOIC | 7     Automotive     7SOIC: 29 mm2: 6 x 4.9 (SOIC | 7)