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Gestión de la energía
Reguladores lineales y de baja salida (LDO)

TPS7A78

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Regulador de tensión lineal de 120 mA, inteligente, de caída de capacidad y caída baja (LDO)

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TPS7A78

ACTIVO
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Detalles del producto

Output options Fixed Output Iout (max) (A) 0.12 Vin (max) (V) 23 Vin (min) (V) 17 Vout (max) (V) 5 Vout (min) (V) 1.25 Fixed output options (V) 3.3, 3.6, 5 Rating Catalog Iq (typ) (mA) 0.28 Thermal resistance θJA (°C/W) 48 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Features AC/DC regulation, Power good, Power-fail detect Accuracy (%) 2 Operating temperature range (°C) -40 to 125
Output options Fixed Output Iout (max) (A) 0.12 Vin (max) (V) 23 Vin (min) (V) 17 Vout (max) (V) 5 Vout (min) (V) 1.25 Fixed output options (V) 3.3, 3.6, 5 Rating Catalog Iq (typ) (mA) 0.28 Thermal resistance θJA (°C/W) 48 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Features AC/DC regulation, Power good, Power-fail detect Accuracy (%) 2 Operating temperature range (°C) -40 to 125
HTSSOP (PWP) 14 32 mm² 5 x 6.4
  • Non-isolated power solution for ≥ 18 VAC RMS:
    • Up to 75% efficiency
    • Standby power consumption: 15 mW (typical)
    • Line-voltage, cap-drop capacitor as small as 1/4th the size of linear solutions
  • Available in fixed output voltages:
    • 1.3 V to 5 V (50-mV steps)
  • Power-fail detection
  • Power-good indication
  • 1% typical accuracy
  • Package:
    • 5-mm × 6.5-mm HTSSOP-14 (PWP)
  • Non-isolated power solution for ≥ 18 VAC RMS:
    • Up to 75% efficiency
    • Standby power consumption: 15 mW (typical)
    • Line-voltage, cap-drop capacitor as small as 1/4th the size of linear solutions
  • Available in fixed output voltages:
    • 1.3 V to 5 V (50-mV steps)
  • Power-fail detection
  • Power-good indication
  • 1% typical accuracy
  • Package:
    • 5-mm × 6.5-mm HTSSOP-14 (PWP)

The TPS7A78 improves the overall efficiency and standby-power in power-supplies in an easy-to-use, non-magnetic approach to AC/DC conversion. The TPS7A78 uses a capacitor-drop architecture to lower the AC source voltage before actively clamping the rectified voltage. The device then regulates this rectified voltage down to the application-specific operating voltage. The unique architecture of the device allows the standby power to be reduced to just a few 10s of milliwatts. The TPS7A78 switched-capacitor stage reduces power losses by stepping down the rectified input voltage by a factor of four and increasing the output-to-input current by the same ratio, as given by PIN ≅ POUT and VIN ≅ VOUT × 4. Compared to a traditional capacitor-drop (cap-drop) stage, this step down reduces input current, thus minimizing the value of the capacitance needed.

Electricity-metering applications, where the power supply must be reliable and magnetic tamper-proof, benefits from using the TPS7A78 because this device does not require external magnetics. This feature makes complying with IEC 61000-4-8 easier while minimizing magnetic shielding cost.

Additionally, the TPS7A78 also comes with a user-programmable, power-fail detection threshold that can provide an early alert to power failures and enable shutdown before complete power loss. The power-good indicator (PG) is also provided for sequencing or resetting a microcontroller.

The TPS7A78 is available in a 14-pin HTSSOP (PWP) package.


The TPS7A78 improves the overall efficiency and standby-power in power-supplies in an easy-to-use, non-magnetic approach to AC/DC conversion. The TPS7A78 uses a capacitor-drop architecture to lower the AC source voltage before actively clamping the rectified voltage. The device then regulates this rectified voltage down to the application-specific operating voltage. The unique architecture of the device allows the standby power to be reduced to just a few 10s of milliwatts. The TPS7A78 switched-capacitor stage reduces power losses by stepping down the rectified input voltage by a factor of four and increasing the output-to-input current by the same ratio, as given by PIN ≅ POUT and VIN ≅ VOUT × 4. Compared to a traditional capacitor-drop (cap-drop) stage, this step down reduces input current, thus minimizing the value of the capacitance needed.

Electricity-metering applications, where the power supply must be reliable and magnetic tamper-proof, benefits from using the TPS7A78 because this device does not require external magnetics. This feature makes complying with IEC 61000-4-8 easier while minimizing magnetic shielding cost.

Additionally, the TPS7A78 also comes with a user-programmable, power-fail detection threshold that can provide an early alert to power failures and enable shutdown before complete power loss. The power-good indicator (PG) is also provided for sequencing or resetting a microcontroller.

The TPS7A78 is available in a 14-pin HTSSOP (PWP) package.


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Documentación técnica

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Tipo Título Fecha
* Data sheet TPS7A78 120-mA, Smart AC/DC Linear Voltage Regulator datasheet (Rev. A) PDF | HTML 17 sep 2019
EVM User's guide TPS7A78EVM-041 Evaluation Module User's Guide PDF | HTML 16 ago 2023
Application note How to Make a Simple Nonmagnetic AC/DC Power Supply 21 feb 2020
White paper How to detect and harden a meter against tampering by neutral disconnection 12 feb 2020
Technical article Understanding the difference between capacitors, capacitance and capacitive drop p PDF | HTML 10 sep 2019
EVM User's guide TPS7A78EVM-011 evaluation module user's guide 12 mar 2019
Technical article Searching for the newest innovations in power? Find them at APEC PDF | HTML 09 feb 2019

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

TPS7A78EVM-011 — Módulo de evaluación TPS7A78 para regulador de tensión lineal LDO inteligente de 120 mA con caída de

The TPS7A78EVM-011 evaluation module (EVM) is designed for a typical configuration to evaluate the operation and performance of the TPS7A78, which is a 120-mA smart AC/DC low-dropout (LDO) linear voltage regulator.

The TPS7A78EVM-011 circuit board is configured to be a reference design for (...)

Guía del usuario: PDF
No disponible en TI.com
Placa de evaluación

TPS7A78EVM-041 — Módulo de evaluación TPS7A78 para regulador de tensión lineal CA/CC inteligente de baja caída de 120

El módulo de evaluación (EVM) TPS7A78 evalúa el funcionamiento y el rendimiento del regulador lineal de CA/CC TPS7A78. Esta configuración EVM contiene un único regulador lineal de baja potencia de reserva y tensión de salida variable para una amplia gama de aplicaciones. El regulador es capaz de (...)

Guía del usuario: PDF | HTML
No disponible en TI.com
Soporte de software

SBVC046 — TPS7A78 Calculator Form

Productos y hardware compatibles

Productos y hardware compatibles

Productos
Reguladores lineales y de baja salida (LDO)
TPS7A78 — Regulador de tensión lineal de 120 mA, inteligente, de caída de capacidad y caída baja (LDO)
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Modelo de simulación

TPS7A78 SIMPLIS 3.3 V Model

SBVM957.ZIP (110 KB) - SIMPLIS Model
Descargar
Modelo de simulación

TPS7A78 SIMPLIS 3.6 V Model

SBVM958.ZIP (6 KB) - SIMPLIS Model
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Modelo de simulación

TPS7A78 SIMPLIS Model (Rev. A)

SBVM947A.ZIP (107 KB) - SIMPLIS Model
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Diseños de referencia

TIDA-010036 — Diseño de referencia de medidor de electricidad de derivación monofásico con ADC independientes

This reference design implements Class 0.5 single-phase energy measurement using standalone multi-channel analog-to-digital converters (ADC) to sample a shunt current sensor. With the combination of the shunt sensor and a compact magnetically immune power supply, the design provides protection (...)
Design guide: PDF
Esquema: PDF
Diseños de referencia

TIDA-010060 — Diseño de referencia de las arquitecturas de fuente de alimentación de CA/CC fuera de línea (no aisl

This reference design showcases three non-isolated AC/DC power supply topologies for line-powered applications such as residential circuit interrupters, circuit breakers, home automation equipment and appliances for < 100 mA. The three topologies are:
  • Off-line switcher using inductor
  • AC line (...)
Design guide: PDF
Esquema: PDF
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
HTSSOP (PWP) 14 Ultra Librarian
Se aplican los Términos y condiciones estándar de TI para los elementos de evaluación.

Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

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