Advanced constant voltage and constant current controller with very efficient LED pilot-lamp driver

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.

Key Features

  • Constant voltage and constant current control
  • Very efficient LED pilot-lamp driver
  • Wide operating VCC range (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


Technical Documentation

Product Specifications
Description Version Size
DS7102 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
TA0308 TA0308: Reducing the total no-load power consumption of battery chargers and adapter applications 1.3 100 KB

Presentations & Training Material

Description Version Size
Secondary regulation CC/CV and Supervisor ICs 2 MB

Publications and Collaterals

Description Version Size
Brochure Power management guide 05.2016 4 MB
Support & Community
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Sample & Buy

Part Number 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
SEA05LTR SOT23-6L Tape And Reel -40 150 2.5 Active - - NEC EAR99 - MORE INFO Get Sample 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SEA05LTR ActiveSOT23-6LIndustrialEcopack2

(**) 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.