SLVUCE3 april   2023 TPS54KB20

 

  1.    TPS54KB20EVM 25-A, Regulator Evaluation Module
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Background
    2. 1.2 Before You Begin
    3. 1.3 Performance Characteristics Summary
  4. 2Configurations and Modifications
    1. 2.1 Output Voltage
    2. 2.2 Frequency and Operation Mode Setting (MSEL Pin)
  5. 3Test Setup and Results
    1. 3.1 Input/Output Connections
    2. 3.2 Efficiency
    3. 3.3 Output Voltage Regulation
    4. 3.4 Load Transient and Loop Response
    5. 3.5 Output Voltage Ripple
    6. 3.6 Start-up and Shutdown with EN
    7. 3.7 Thermal Performance
  6. 4Board Layout
    1. 4.1 Layout
  7. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials

1.3 Performance Characteristics Summary

A summary of the TPS54KB20EVM performance characteristics is provided in Table 1-2 and Table 1-3. The TPS54KB20EVM is designed and tested for VIN = 8 V to 16 V for U1 and VIN = 4.5 V to 16 V for U2. Characteristics are given for an input voltage of VIN = 12 V and output voltage of 3.3 V, unless otherwise specified. The ambient temperature is room temperature (20°C to 25°C) for all measurements, unless otherwise noted.

Table 1-2 TPS54KB20EVM Small Size (U1) Performance Characteristics Summary
SPECIFICATIONTEST CONDITIONSMINTYPMAXUNIT
VIN voltage range81216(1)V
Input currentVIN = 8 V, IO = 25 A11.2 A
VIN start voltageSet by EN pin resistor divider7.18V
VIN stop voltageSet by EN pin resistor divider5.98V
Output voltage setpoint3.310V
Output current rangeVIN = 8 V to 16 V025A
Line and load regulationVIN = 8 V to 16 V, IOUT = 0 A to 25 A±0.15%
Load transient responseIOUT = 5 A to 15 AVoltage change–17mV
Recovery time22µs
IOUT = 15 A to 5 AVoltage change14mV
Recovery time22µs
Input ripple voltageIOUT = 25 A780mVPP
Output ripple voltageIOUT = 25 A26mVPP
Output rise timeSet by SS pin capacitor550μs
Current limitSet by ILIM pin resistor27.5A
Switching frequency (fSW)Set by MSEL pin resistor1400kHz
Peak efficiencyIOUT = 10 A94.2%
IC case temperatureIOUT = 25 A, 15-minute soak113°C
(1) Max VIN limited by minimum on-time
Table 1-3 TPS54KB20EVM High Efficiency (U2) Performance Characteristics Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
VIN voltage range 4.5 12 16 V
Input current VIN = 4.5 V, IOUT = 25 A 19.9 A
VIN start voltage Set by EN pin resistor divider 3.84 V
VIN stop voltage Set by EN pin resistor divider 3.20 V
Output voltage setpoint 3.310 V
Output current range VIN = 4.5 V to 16 V 0 25 A
Line and load regulation VIN = 4.5 V to 16 V, IOUT = 0 A to 25 A ±0.03%
Load transient response IOUT = 5 A to 15 A Voltage change –34 mV
Recovery time 40 µs
IOUT = 15 A to 5 A Voltage change 53 mV
Recovery time 42 µs
Input ripple voltage IOUT = 25 A 340 mVPP
Output ripple voltage IOUT = 25 A 16.4 mVPP
Output rise time Set by SS pin capacitor 975 μs
Current limit Set by ILIM pin resistor 27.5 A
Switching frequency (fSW) Set by MSEL pin resistor, J8 short pins 3 and 4 800 kHz
Peak efficiency IOUT = 7.5 A 96.3%
IC case temperature IOUT = 25 A, 15-minute soak 97.2 °C