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SEA05LTR Datasheet(PDF) 1 Page - STMicroelectronics |
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SEA05LTR Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 12 page Preliminary data This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. February 2011 Doc ID 18462 Rev 1 1/12 1 SEA05L Advanced constant voltage and constant current controller with very efficient LED pilot-lamp driver 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 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. Figure 1. Block diagram 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. Table 1. Device summary Order code Package Packing SEA05LTR SOT23-6L Tape & reel SOT23-6L (plastic package) Out LD Vctrl Isense + - + - 1.23 V 2.5 V 1 2 5 3 4 6 VCC 50m V OSC GND www.st.com |
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