Advanced CV/CC secondary controller

The SEA05 is a highly integrated solution for SMPS applications requiring a dual control loop to perform CV (constant voltage) and CC (constant current) regulation.

The device integrates a voltage reference, two opamps (with OR-ed open-drain outputs), and a lowside current sensing circuit.

The voltage reference, along with one op-amp, is the core of the voltage control loop; the current sensing circuit and the other op-amp make up the current control loop.

The external components needed to complete the two control loops are: a resistor divider that senses the output of the power supply and fixes the voltage regulation setpoint at the specified value; a sense resistor that feeds the current sensing circuit with a voltage proportional to the dc output current; this resistor determines the current regulation setpoint and must be adequately rated in terms of power dissipation; the frequency compensation components (R-C networks) for both loops.

The device, housed in one of the smallest available package, is ideal for space-shrunk applications such as adapters and chargers.

Key Features

  • Open-drain output stage
  • Current sense threshold: 50 mV
  • SOT23-6L micro package
  • Constant voltage and constant current control
  • Low quiescent consumption: 200 µA
  • Wide operating VCC range [3.5 - 36] V
  • Voltage control loop accuracy +/- 0.5%
  • Low external component count
  • Voltage reference: 2.5 V



Description Version Size
DS6685 DS6685: Advanced constant voltage and constant current controller 1.1 255 KB
Technical Notes & Articles
Description Version Size
TA0308 TA0308: Reducing the total no-load power consumption of battery chargers and adapter applications 1.3 100 KB
Design Notes & Tips
Description Version Size
DN0002 DN0002: 10W off-line LED driver based on VIPER27 1.0 826 KB


Description Version Size
ST products and solutions for solar energy 5.1 2 MB


Description Version Size
Brochure Power management guide 09.2017 4 MB


型号 Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Reference Voltage (V) (nom) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
SEA05TR SOT23-6L Tape And Reel - - - Active - - NEC EAR99 MALAYSIA MORE INFO 获取样片 Add to cart DISTRIBUTOR AVAILABILITY

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors


型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SEA05TR ActiveSOT23-6LIndustrialEcopack2 0 0

(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.