ZHCSBC7E JULY 2013 – December 2019 LMZ31710
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 VIN and PVIN Input Voltage
- 7.3.2 3.3-V PVIN Operation
- 7.3.3 Adjusting the Output Voltage (0.6 V to 5.5 V)
- 7.3.4 Capacitor Recommendations For the LMZ31710 Power Supply
- 7.3.5 Transient Response
- 7.3.6 Power Good (PWRGD)
- 7.3.7 Light Load Efficiency (LLE)
- 7.3.8 SYNC_OUT
- 7.3.9 Parallel Operation
- 7.3.10 Power-Up Characteristics
- 7.3.11 Pre-Biased Start-Up
- 7.3.12 Remote Sense
- 7.3.13 Thermal Shutdown
- 7.3.14 Output On/Off Inhibit (INH)
- 7.3.15 Slow Start (SS/TR)
- 7.3.16 Overcurrent Protection
- 7.3.17 Synchronization (CLK)
- 7.3.18 Sequencing (SS/TR)
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機械、封裝和可訂購信息
7.3.18 Sequencing (SS/TR)
Many of the common power supply sequencing methods can be implemented using the SS/TR, INH and PWRGD pins. The sequential method is illustrated in Figure 35 using two LMZ31710 devices. The PWRGD pin of the first device is coupled to the INH pin of the second device which enables the second power supply once the primary supply reaches regulation. Figure 36 shows sequential turn-on waveforms of two LMZ31710 devices.
Figure 35. Sequencing Schematic 
Figure 36. Sequencing Waveforms Simultaneous power supply sequencing can be implemented by connecting the resistor network of R1 and R2 shown in Figure 37 to the output of the power supply that needs to be tracked or to another voltage reference source. The tracking voltage must exceed 750mV before VOUT2 reaches its set-point voltage. The PWRGD output of the VOUT2 device may remain low if the tracking voltage does not exceed 1.4 V. Figure 38 shows simultaneous turn-on waveforms of two LMZ31710 devices. Equation 3 and Equation 4 calculate the values of R1 and R2.
Figure 37. Simultaneous Tracking Schematic 
Figure 38. Simultaneous Tracking Waveforms