Startseite Energiemanagement Linear- und Low-Dropout-Regler (LDO)

TPS7A78

AKTIV

Intelligenter linearer Spannungsregler Low-Dropout (LDO), Capacitance-Drop, 120 mA

Produktdetails

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 Iq (typ) (mA) 0.28 Thermal resistance θJA (°C/W) 48.0 Rating Catalog 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 Iq (typ) (mA) 0.28 Thermal resistance θJA (°C/W) 48.0 Rating Catalog 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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Technische Dokumentation

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Typ Titel Datum
* 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 Aug 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 Mär 2019
Technical article Searching for the newest innovations in power? Find them at APEC PDF | HTML 09 Feb 2019

Design und Entwicklung

Weitere Bedingungen oder erforderliche Ressourcen enthält gegebenenfalls die Detailseite, die Sie durch Klicken auf einen der unten stehenden Titel erreichen.

Evaluierungsplatine

TPS7A78EVM-011 — Evaluierungsmodul für intelligenten AC/DC-LDO-Linearspannungsregler TPS7A78 mit 120 mA

Das Evaluierungsmodul (EVM) TPS7A78EVM-011 wurde für eine typische Konfiguration zur Evaluierung des Betriebs und der Leistung des TPS7A78 entwickelt. Dieser ist ein intelligenter linearer AC/DC-Spannungsregler für 120 mA mit Low-Dropout (LDO).

Die TPS7A78EVM-011-Platine ist als Referenzdesign für (...)

Benutzerhandbuch: PDF
Evaluierungsplatine

TPS7A78EVM-041 — TPS7A78-Evaluierungsmodul für den intelligenten AC/DC-Low-Dropout-Linearspannungsregler mit 120 mA

Das TPS7A78-Evaluierungsmodul (EVM) evaluiert den Betrieb und die Leistung der TPS7A78-AC/DC-Linearregler. Diese EVM-Konfiguration enthält einen einzelnen linearen Regler mit geringer Standby-Leistung und variabler Ausgangsspannung für eine Vielzahl von Anwendungen. Der Regler kann bis zu 120 mA an (...)

Benutzerhandbuch: PDF | HTML
Support-Software

SBVC046 TPS7A78 Calculator Form

Unterstützte Produkte und Hardware

Unterstützte Produkte und Hardware

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Linear- und Low-Dropout-Regler (LDO)
TPS7A78 Intelligenter linearer Spannungsregler Low-Dropout (LDO), Capacitance-Drop, 120 mA
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SBVM957.ZIP (110 KB) - SIMPLIS Model
Simulationsmodell

TPS7A78 SIMPLIS 3.6 V Model

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Simulationsmodell

TPS7A78 SIMPLIS Model (Rev. A)

SBVM947A.ZIP (107 KB) - SIMPLIS Model
Referenzdesigns

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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
Schaltplan: PDF
Referenzdesigns

TIDA-010060 — Referenzdesign für Offline-AC/DC-Stromversorgungsarchitekturen (nicht isoliert) für Netzanwendungen

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
Schaltplan: PDF
Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
HTSSOP (PWP) 14 Ultra Librarian

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