ST Life.augmented

SEA05L

Advanced constant voltage and constant current controller with very efficient LED pilot-lamp driver
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The device is a highly integrated solution for SMPS applications, with an LED pilot-lamp requiring a dual control loop to perform CV (constant voltage) and CC (constant current) regulation.

The IC allows very efficient LED pilot-lamp driving which helps to reduce the standby consumption of the SMPS. It integrates a voltage reference, two op-amps (with OR-ed open-drain outputs), a low-side current sensing circuit and an LED pilot-lamp driver pin implemented with an open-drain mosfet driven by square waveform with 12.5% duty cycle at 1 kHz that allows reducing LED consumption.

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 is ideal for space-critical applications.

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Errata Sheet
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Datasheet

Key Features

  • Constant voltage and constant current control
  • Very efficient LED pilot-lamp driver
  • Wide operating VCCrange (3.5 V - 36 V)
  • Low quiescent consumption: 250 μA
  • Voltage reference: 2.5 V
  • Voltage control loop accuracy ± 0.5%
  • Current sense threshold: 50 mV
  • Current control loop accuracy ± 4%
  • Low external component count
  • Open-drain output stage
  • SOT23-6L package

Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DS7102: Advanced constant voltage and constant current controller with very efficient LED pilot-lamp driver
1.1 276 KB

Technical Notes & Articles

Description Version Size
pdf
TA0308: Reducing the total no-load power consumption of battery chargers and adapter applications
1.3 100 KB

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Part Number Description
EVL6566B-65W-SR 12 V - 65 W FF flyback adapter with synchronous rectification featuring L6566B, STSR30 and SEA05L

Sample & Buy

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Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Reference Voltage (nom) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
SEA05LTRActiveSOT23-6LTape And Reel-401502.5_Free Samples.222Distributor reported inventory date: 2014-10-31
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA23223000
DIGIKEYOrder NowWORLDWIDE28121
MOUSEROrder NowWORLDWIDE83741
Ecopack2PDF
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(*) 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
(**) The Material Declaration forms available on st.com 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.
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