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.
- 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
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RoHS Compliance Grade
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Sample & Buy
|Part Number||Order from Distributors||Order from ST||Marketing Status||ECCN (US)||ECCN (EU)||Packing Type||Package||Temperature (°C)||Reference Voltage (V) (nom)||Country of Origin||Budgetary Price (US$)*/Qty||More info|
|SEA05LTR|| 3 distributors |
Distributor availability ofSEA05LTR
Distributor reported inventory date: 2020-07-31
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|EAR99||NEC||Tape And Reel||SOT23-6L||-40||150||2.5||MALAYSIA||0.2664 / 1k|| |
Tape And Reel
Operating Temperature (°C)
Reference Voltage (V) (nom)
Budgetary Price (US$)* / Qty
0.2664 / 1k
Country of Origin