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SEA05L

STMicroelectronics
Part Number SEA05L
Manufacturer STMicroelectronics
Description Advanced constant voltage and constant current controller
Published Mar 12, 2016
Detailed Description SEA05L Advanced constant voltage and constant current controller with very efficient LED pilot-lamp driver Preliminary d...
Datasheet PDF File SEA05L PDF File

SEA05L
SEA05L

Overview
SEA05L Advanced constant voltage and constant current controller with very efficient LED pilot-lamp driver Preliminary data 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 Applications ■ AC-DC adapter with LED pilot-lamp ■ Battery chargers with LED pilot-lamp ■ SMPS with LED pilot-lamp Description 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 lowside 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.
SOT23-6L (plastic package) Figure 1.
Block diagram 1.
23 V 2.
5 V + - V CC 6 50mV + - 5 3 4 2 GND 1 OSC Isense Out Vctrl LD 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 n...


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