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

设计

技术文档

产品规格
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

演示和培训资料

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

出版刊物和宣传资料

手册
Description Version Size
Brochure Power management guide 05.2016 7 MB
支持和社区



样片和购买

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
SEA05LTR SOT23-6L Tape And Reel -40 150 2.5 Active - - NEC EAR99 - MORE INFO 获取样片 Add to cart DISTRIBUTOR AVAILABILITY
test

(*) 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

质量和可靠性

型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SEA05LTR ActiveSOT23-6LIndustrialEcopack2
test

(**) 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.

×