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LM2576T Arkusz danych(PDF) 9 Page - HTC Korea TAEJIN Technology Co. |
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LM2576T Arkusz danych(HTML) 9 Page - HTC Korea TAEJIN Technology Co. |
9 / 14 page 3.0A, 52kHz, Step-Down Switching Regulator LM2576 This pin is the positive input supply for the LM2576 step–down switching regulator.In order to minimize voltage transients and to supply the switching currents needed by the regulator, a suitable input bypass capacitor must be present .(Cin in Figure 1). This is the emitter of the internal switch. The saturation voltage Vsat of this output switch is typically 1.5 V. It should be kept in mind that the PCB area connected to this pin should be kept to a minimum in order to minimize coupling to sensitive circuitry. Circuit ground pin. See the information about the printed circuit board layout. This pin senses regulated output voltage to complete the feedback loop. The signal is divided by the internal resistor divider network R2, R1 and applied to the non–inverting input of the internal error amplifier. In the Adjustable version of the LM2576 switching regulator this pin is the direct input of the error amplifier and the resistor network R2, R1 is connected externally to allow programming of the output voltage. It allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total input supply current to approximately 80 mA. The threshold voltage is typically 1.4 V. Applying a voltage above this value (up to +Vin) shuts the regulator off. If the voltage applied to this pin is lower than 1.4V or if this pin is left open, the regulator will be in the "on" condition Feedback HTC - 9 - Symbol 1 Vin Output 4 5 ON/OFF 2 Gnd 3 Description PIN FUNCTION DESCRIPTION |
Podobny numer części - LM2576T |
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Podobny opis - LM2576T |
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