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podes hacer un circuito basico para el LM2577 adj para una fuente dcdc de 8 a 5...
tyrco

tyrco

@copilot podes hacer un circuito basico para el LM2577 adj para una fuente dcdc de 8 a 50v
2y

copilot

Claro, estaré encantado de ayudarte a diseñar un circuito básico para un convertidor DC-DC usando el LM2577 ADJ, que es un regulador de conmutación elevador (boost) ajustable. Para el propósito de esta explicación, asumiré que deseas diseñar un circuito que aumente un voltaje de entrada en el rango de 8 a 50V.
El LM2577 ADJ es parte de la serie Simple Switcher de Texas Instruments, y es conveniente para este tipo de aplicaciones de conversión de voltaje. Aquí hay una guía paso a paso sobre cómo podría ser este circuito:
Componentes requeridos:
  • LM2577 ADJ: Regulador de conmutación elevador ajustable.
  • L1: Inductor de potencia. Para un rango de entrada de 8 a 50V, un valor común podría ser de 100µH.
  • D1: Diodo Schottky. Es importante seleccionar uno que pueda manejar la corriente máxima esperada y tener una tensión inversa suficiente, por ejemplo, 1N5822.
  • Cin: Condensador de entrada. Un valor típico podría ser de 100µF, 63V.
  • Cout: Condensador de salida. Un valor típico podría ser de 220µF, 63V, para garantizar una salida estable.
  • Rfb1 y Rfb2: Resistencias para el ajuste del voltaje de salida. Los valores dependerán del voltaje de salida deseado, consultando la ecuación provista en la hoja de datos del LM2577.
Esquemático de conexión básica:
  1. Vin (Entrada de voltaje): Conectar el positivo de la fuente de alimentación a LM2577:Vin y el negativo de la fuente a LM2577:GND.
  2. Tierra: Asegúrate de que todos los componentes compartan una conexión común a tierra (GND).
  3. Inductor (L1): Conectar L1:1 a LM2577:SW y L1:2 al ánodo de D1.
  4. Diodo (D1): Conectar el cátodo de D1 a LM2577:Vout.
  5. Condensadores:
    • Conectar Cin:1 entre LM2577:Vin y LM2577:GND.
    • Conectar Cout:1 entre LM2577:Vout y LM2577:GND.
  6. Circuito de Retroalimentación:
    • Conectar Rfb1:1 a LM2577:Vout y Rfb1:2 al punto intermedio entre Rfb1 y Rfb2.
    • Conectar Rfb2:1 desde el punto intermedio entre Rfb1 y Rfb2 a LM2577:FB (realimentación).
    • El punto de ajuste del voltaje de salida se modifica cambiando los valores de Rfb1 y Rfb2 según la ecuación de la hoja de datos.
Cálculo de resistencias para la retroalimentación:
Para definir el voltaje de salida (V_{out}), puedes usar la siguiente ecuación proporcionada en la hoja de datos del LM2577:
Vout=Vref(1+Rfb1Rfb2)+Iadj⋅Rfb1V_{out} = V_{ref} \left(1 + \frac{Rfb1}{Rfb2}\right) + I_{adj} \cdot Rfb1
Donde (V_{ref}) es el voltaje de referencia del LM2577 (1.23V para LM2577) y (I_{adj}) es típicamente muy pequeño y puede ser ignorado para simplificar el cálculo. Para conseguir un voltaje de salida específico, ajusta los valores de (Rfb1) y (Rfb2) basándote en esta fórmula.
Asegúrate de revisar las hojas de datos de todos los componentes para asegurar su adecuado rango operativo según tus necesidades específicas. Este es un circuito de arranque básico para el LM2577, y siempre es recomendable simular tu circuito (cuando sea posible) antes de construirlo físicamente.
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BC817-40

Bipolar Transistors BJT 45V 250mW 500mA NPN SOT-23(SOT-23-3)

Properties

Transistor

BC817-40

ST SEMTECH

datasheet.lcsc.com/lcsc/1811061725_ST-Semtech-BC817-40_C85078.pdf

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Qty 1

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