SBVS343 March   2019 TPS7A78

ADVANCE INFORMATION for pre-production products; subject to change without notice.  

  1. Features
  2. Applications
    1.     Typical Schematic
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
    1.     Pin Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Active Bridge Control
      2. 7.3.2 Full Bridge (FB) and Half Bridge Configurations
      3. 7.3.3 4 to 1 Switch Capacitor Voltage Reduction
      4. 7.3.4 VLDO_IN Overvoltage Protection
      5. 7.3.5 Dropout Voltage Regulation
      6. 7.3.6 Current Limit
      7. 7.3.7 Programmable Power-Fail Detection
      8. 7.3.8 Power-Good (PG) Detection
      9. 7.3.9 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation: AC Input mode
      2. 7.4.2 Dropout Mode
      3. 7.4.3 Disabled Mode
      4. 7.4.4 Normal Operation: DC Input mode
  8. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Recommended Capacitor Types
      2. 8.1.2 Cap-Drop Capacitor CS
      3. 8.1.3 Surge Resistor RS
      4. 8.1.4 Input and Output Capacitors Requirements
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ(パッケージ|ピン)
発注情報

Device Functional Modes

Table 1 shows the conditions that lead to the different modes of operation. See the Electrical Characteristics table for parameter values.

Table 1. Device Functional Mode Comparison

OPERATING MODE PARAMETER
SUPPLY ON SCIN PIN (VSCIN) IOUT TJ
Normal operation: AC input mode(1) Driven from AC input IOUT < IOUT (max) TJ < TSD for rising
Dropout mode(2) Figure 7 shows dropout vs IOUT TJ < TSD for rising
Disabled mode(3) VSCIN < UVLOSCIN_POR or VLDO_IN < VLDO_POR TJ > TSD for rising
Normal operation: DC input mode(4) VSCIN (max) > VSCIN > UVLOSCIN_RISING IOUT < IOUT (max) TJ < TSD for rising
The device can be on if VAC < 70 V with a light load, but the device was bench tested from 70 VAC to 270 VAC (45 Hz to 65 Hz).
The device can be in dropout whether powered by AC or DC input when (VLDO_IN - VLDO_OUT) < 0.25 V. See the Dropout Mode section for more details.
Any true condition disables the device.
The DC input mode is available with DC supply applied on SCIN pin bounded by VSCIN (max) > VSCIN > UVLOSCIN_RISING as specified in the Recommended Operating Conditions and Electrical Characterstics tables.