ZHCSGB1C March 2013 – December 2019 TPS84A20
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Ordering Information
- 6 Specifications
- 7 Device Information
- 8 Typical Characteristics (PVIN = VIN = 12 V)
- 9 Typical Characteristics (PVIN = VIN = 5 V)
- 10Typical Characteristics (PVIN = 3.3 V, VIN = 5 V)
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11Application Information
- 11.1 Adjusting the Output Voltage
- 11.2 Capacitor Recommendations for the TPS84A20 Power Supply
- 11.3 Transient Response
- 11.4 Transient Waveforms
- 11.5 Application Schematics
- 11.6 VIN and PVIN Input Voltage
- 11.7 3.3 V PVIN Operation
- 11.8 Power Good (PWRGD)
- 11.9 Light Load Efficiency (LLE)
- 11.10 SYNC_OUT
- 11.11 Parallel Operation
- 11.12 Power-Up Characteristics
- 11.13 Pre-Biased Start-Up
- 11.14 Remote Sense
- 11.15 Thermal Shutdown
- 11.16 Output On/Off Inhibit (INH)
- 11.17 Slow Start (SS/TR)
- 11.18 Overcurrent Protection
- 11.19 Synchronization (CLK)
- 11.20 Sequencing (SS/TR)
- 11.21 Programmable Undervoltage Lockout (UVLO)
- 11.22 Layout Considerations
- 11.23 EMI
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
11.12 Power-Up Characteristics
When configured as shown in the front page schematic, the TPS84A20 produces a regulated output voltage following the application of a valid input voltage. During the power-up, internal soft-start circuitry slows the rate that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the input source. Figure 27 shows the start-up waveforms for a TPS84A20, operating from a 5-V input (PVIN = VIN) and with the output voltage adjusted to 1.8 V. Figure 28 shows the start-up waveforms for a TPS84A20 starting up into a pre-biased output voltage. The waveforms were measured with a 5-A constant current load.
Figure 27. Start-Up Waveforms 
Figure 28. Start-up into Pre-bias