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線性與低壓差 (LDO) 穩壓器

TPS7A78

現行

120mA、智慧電容下降、低壓差 (LDO) 線性電壓穩壓器

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產品規格表

TPS7A78

現行
產品規格表 立即訂購

產品詳細資料

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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類型 標題 日期
* Data sheet TPS7A78 120-mA, Smart AC/DC Linear Voltage Regulator datasheet (Rev. A) PDF | HTML 2019年 9月 17日
EVM User's guide TPS7A78EVM-041 Evaluation Module User's Guide PDF | HTML 2023年 8月 16日
Application note How to Make a Simple Nonmagnetic AC/DC Power Supply 2020年 2月 21日
White paper How to detect and harden a meter against tampering by neutral disconnection 2020年 2月 12日
Technical article Understanding the difference between capacitors, capacitance and capacitive drop p PDF | HTML 2019年 9月 10日
EVM User's guide TPS7A78EVM-011 evaluation module user's guide 2019年 3月 12日
Technical article Searching for the newest innovations in power? Find them at APEC PDF | HTML 2019年 2月 9日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

TPS7A78EVM-011 — 適用於 120-mA、智慧電容下降、LDO 線性電壓穩壓器的 TPS7A78 評估模組

TPS7A78EVM-011 評估模組 (EVM) 爲典型配置設計，用於評估 TPS7A78 的運作和性能，其為 120 mA 智慧 AC/DC 低壓差 (LDO) 線性電壓穩壓器。

TPS7A78EVM-011 電路板主要配置爲參考設計，可供需要高達 100 mA 動態負載電流的工程應用。

使用指南: PDF
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開發板

TPS7A78EVM-041 — 適用 120-mA 智慧型 AC/DC 低壓降線性電壓穩壓器的 TPS7A78 評估模組

The TPS7A78 評估模組 (EVM) 可評估 TPS7A78 AC/DC 線性穩壓器的運作及性能。此 EVM 配置包含適合各種應用的單一低待機功耗、可變輸出電壓線性穩壓器。該穩壓器可以 90 VAC 至 264-VAC 輸入為負載提供最高 120 mA。EVM 設計為可讓使用者評估各種應用的評估系統，不應做為最佳化最小尺寸解決方案的參考設計。

使用指南: PDF | HTML
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支援軟體

SBVC046 — TPS7A78 Calculator Form

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產品
線性與低壓差 (LDO) 穩壓器
TPS7A78 — 120mA、智慧電容下降、低壓差 (LDO) 線性電壓穩壓器
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模擬型號

TPS7A78 SIMPLIS 3.3 V Model

SBVM957.ZIP (110 KB) - SIMPLIS Model
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模擬型號

TPS7A78 SIMPLIS 3.6 V Model

SBVM958.ZIP (6 KB) - SIMPLIS Model
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模擬型號

TPS7A78 SIMPLIS Model (Rev. A)

SBVM947A.ZIP (107 KB) - SIMPLIS Model
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參考設計

TIDA-010036 — 使用獨立 ADC 的一相分流電錶參考設計

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
電路圖: PDF
參考設計

TIDA-010060 — 適合電網應用的離線 (非隔離) AC/DC 電源供應架構參考設計

此參考設計展示三種非隔離式 AC/DC 電源拓撲，適合線路供電應用，例如住宅斷路器、斷路器、家庭自動化設備，以及 < 100 mA 的設備。共有以下三種拓撲：
  • 使用電感器的離線切換器
  • 使用切換式電容器的 AC 線路穩壓器 (主動箝位電容器壓降式電源供應器)
  • 電容下降穩壓器 (電容下降電源供應器)


效率、啟動時間與解決方案尺寸間的取捨，需在各種輸入與輸出條件下跨架構進行。其中包括設計方法、測試資料與比較，讓系統設計人員能快速評估並自訂解決方案。

Design guide: PDF
電路圖: PDF
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