ZHCS803E June 2013 – February 2020 LMZ31704
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Specifications
- 6 Device Information
- 7 Typical Characteristics (PVIN = VIN = 12 V)
- 8 Typical Characteristics (PVIN = VIN = 5 V)
- 9 Typical Characteristics (PVIN = 3.3 V, VIN = 5 V)
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10Application Information
- 10.1 Adjusting the Output Voltage
- 10.2 Capacitor Recommendations for the LMZ31704 Power Supply
- 10.3 Transient Response
- 10.4 Transient Waveforms
- 10.5 Application Schematics
- 10.6 Custom Design With WEBENCH® Tools
- 10.7 VIN and PVIN Input Voltage
- 10.8 3.3 V PVIN Operation
- 10.9 Power Good (PWRGD)
- 10.10 SYNC_OUT
- 10.11 Parallel Operation
- 10.12 Light Load Efficiency (LLE)
- 10.13 Power-Up Characteristics
- 10.14 Pre-Biased Start-up
- 10.15 Remote Sense
- 10.16 Thermal Shutdown
- 10.17 Output On/Off Inhibit (INH)
- 10.18 Slow Start (SS/TR)
- 10.19 Overcurrent Protection
- 10.20 Synchronization (CLK)
- 10.21 Sequencing (SS/TR)
- 10.22 Programmable Undervoltage Lockout (UVLO)
- 10.23 Layout Considerations
- 10.24 EMI
- 11器件和文档支持
- 12机械、封装和可订购信息
10.13 Power-Up Characteristics
When configured as shown in the front page schematic, the LMZ31704 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 24 shows the start-up waveforms for a LMZ31704, operating from a 5-V input (PVIN=VIN) and with the output voltage adjusted to 1.8 V. Figure 25 shows the start-up waveforms for a LMZ31704 starting up into a pre-biased output voltage.
Figure 24. Start-up Waveforms 
Figure 25. Start-up into Pre-bias