TIDT237 December   2022 TPS73801-SEP

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
  5. 2Testing and Results
    1. 2.1 Voltage Regulation
    2. 2.2 Efficiency Graphs
    3. 2.3 Thermal Images
    4. 2.4 Bode Plots
  6. 3Waveforms
    1. 3.1 Output Voltage Ripple
    2. 3.2 Current Limit
    3. 3.3 Load Transients
    4. 3.4 Start-up and Shutdown
    5. 3.5 Thermal Shutdown

3.2 Current Limit

The following figures show a load step being applied from 2.1 A to 3.5 A. The current ramps up, hits current limit, and output drops followed by hiccup mode. Once the load step goes down to 2.1 A the output recovers with soft start.

GUID-20210708-CA0I-1GQQ-20ZH-GSM89FTQZVCS-low.png Figure 3-37 Load Step, 13.2 VIN, 25°C
GUID-20210708-CA0I-MSGH-GZXC-XTK4KJNSPWKS-low.png Figure 3-38 Load Step, 13.2 VIN, –30°C
GUID-20210708-CA0I-NP7X-K8CT-CSLHHC6FNH4V-low.png Figure 3-39 Load Step, 13.2 VIN, 85°C

In Figure 3-40 through Figure 3-42, the current limit trip point shifts as the load is increased to above the limit.

GUID-20210708-CA0I-DS3G-2VRW-VBRCJNX07H8J-low.png Figure 3-40 LM63625 Output Voltage vs Load Current, VOUT = 9.3 V, Ta = 85°C
GUID-20210708-CA0I-0RWC-BMRN-7F5NPVSXNP2G-low.png Figure 3-41 LM63625 Output Voltage vs Load Current, VOUT = 9.3 V, Ta = 25°C
GUID-20210708-CA0I-1FCD-WJ06-H51CPTPFBGJW-low.png Figure 3-42 LM63625 Output Voltage vs Load Current, VOUT = 9.3 V, Ta = –30°C