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Zero sandby PSR Flyback controller with CVCC and wake-up monitoring

Inventory: 7,179
Custom reel may be available

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Packaging information

Package | Pins SOIC (D) | 7
Operating temperature range (℃) Q (-40 to 125)
Package qty | Carrier: 2,500 | LARGE T&R
Custom reel may be available
View more packaging information

Quality information

RoHS Yes
Lead finish / Ball material NIPDAU
MSL rating / Peak reflow Level-1-260C-UNLIM
Material content View
DPPM / MTBF / Fit rate View
Qualification summary View
Ongoing reliability monitoring View
Device marking View


  • Enables Zero-Power (<5 mW) standby consumption
  • Smart Wake-Up detection enables smallest output capacitance
  • Primary-side regulation (PSR) eliminates optocoupler
  • ±5% voltage regulation and current regulation across line and load
  • 700-V start-up switch
  • 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
  • Overvoltage, low-line, and overcurrent protection functions
  • Programmable cable compensation
  • SOIC-7 package

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The UCC28730 isolated-flyback power supply controller provides Constant-Voltage (CV) andConstant-Current (CC) output regulation without the use of an optical coupler, andwake-up signal detection to improve transient response to largeload steps. A minimum switching frequency of 30 Hz facilitates achieving less than 5 mW of no-loadpower. This device processes information from the primary power switch and an auxiliary flybackwinding for precise control of output voltage and current. The wake-up monitoring works with a secondary-side alarm device such as theUCC24650 to deliver rapid response to heavy load steps using minimal output capacitance.

An internal 700-V start-up switch, dynamically- controlled operating states and atailored modulation profile support ultra-low stand-by power without sacrificing start-up time oroutput transient response. Control algorithms in the UCC28730 allow operating efficiencies to meetor exceed applicable standards. Discontinuous conduction mode (DCM) operation with valley-switchingreduces 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.

Qty Price
1-99 $1.04
100-249 $0.80
250-999 $0.59
1,000+ $0.42

Alternative carriers

Part number UCC28730D
Package qty | Carrier 75 | TUBE
Inventory 450
Qty | Price (USD) 1ku | $0.51