TPS7A78 Texas instruments

TPS7A78

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TPS7A78

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Описание

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.

Non-isolated power solution for ≥ 18 V_{AC 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)

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
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