SLUU182A January   2004  – March 2022 TPS5124

 

  1.   Trademarks
  2. 1Introduction
  3. 2Features
  4. 3Schematic
  5. 4Design Procedure
    1. 4.1 Frequency Setting
    2. 4.2 Inductance Value
    3. 4.3 Output Capacitors
    4. 4.4 Input Capacitors
      1. 4.4.1 Case One: D1, D2 < 0.5
      2. 4.4.2 Case Two: D2 < 0.5 < D1
    5. 4.5 Compensation Design
    6. 4.6 Current Limiting
    7. 4.7 Timer Latch
      1. 4.7.1 Undervoltage Protection
      2. 4.7.2 Short Circuit Protection
      3. 4.7.3 Overvoltage Protection
      4. 4.7.4 Disabling the Protection Function
        1. 4.7.4.1 Disabling the Overcurrent Protection
        2. 4.7.4.2 Disabling the Overvoltage Protection or Undervoltage Protection
  6. 5Test Results
    1. 5.1 Efficiency Curves
    2. 5.2 Typical Operating Waveform
    3. 5.3 Start-Up Waveform
    4. 5.4 Output Ripple Voltage and Load Transient
  7. 6Layout Guidelines
    1. 6.1 Low-Side MOSFET
    2. 6.2 Connections
    3. 6.3 Bypass Capacitor
    4. 6.4 Bootstrap Capacitor
    5. 6.5 Output Voltage
  8. 7PCB Layout
  9. 8List of Materials
  10. 9Revision History

2 Features

This EVM is designed to operate from 12-V bus voltage. It generates two outputs: 3.3 V at 15 A and 1.5 V at 10 A.

Table 2-1 TPS5124EVM-001 Performance Summary
Parameter Test Conditions MIN TYP MAX Units
Input voltage range 6.5 12.0 15.0 V
Operating frequency 300 kHz
Input ripple voltage (RMS) VIN = 12 V, IOUT1 = 15 A, IOUT2 = 10 A 92 mV
Channel 1
Output current range 6.5 V ≤ VIN ≤ 15 V 0 15 16 A
Line regulation 6.5 V ≤ VIN ≤ 15 V, IOUT = 15 A ±0.1%
Load regulation 1 A ≤ IOUT ≤ 15 A, VIN = 12 V ±0.3%
Load transient response voltage change IOUT rising from 0 A to 8.5 A −160 mVPK
IOUT falling from 8.5 A to 0 A 200
Load transient response recovery time IOUT rising from 0 A to 8.5 A 80 ms
IOUT falling from 8.5 A to 0 A 120
Loop bandwidth IOUT = 15 A 30 kHz
Phase margin IOUT = 15 A 55 °
Output ripple voltage IOUT = 15 A 33 66 mVPP
Output rise time VIN = 12 V, VOUT = 3.3 V, IOUT = 15 A 2.85 ms
Full load efficiency VIN = 12 V, VOUT = 3.3 V, IOUT = 15 A 90.6%
Channel 2
Output current range 6.5 V ≤ VIN ≤ 15 V 0 10 12 A
Line regulation 6.5 V ≤ VIN ≤ 15 V ±0.1%
Load regulation 1 A ≤ IOUT ≤ 10 A, VIN = 12 V ±0.3%
Load transient response voltage change IOUT rising from 0 A to 7.5 A −120 mVPK
IOUT falling from 7.5 A to 0 A 220
Load transient response recovery time IOUT rising from 0 A to 7.5 A 40 ms
IOUT falling from 7.5 A to 0 A 80
Loop bandwidth IOUT = 10 A 23 kHz
Phase margin IOUT = 10 A 55 °
Output ripple voltage IOUT = 10 A 15 30 mVPP
Output rise time VIN = 12 V, VOUT = 1.5 V, IOUT = 10 A 2.12 ms
Full load efficiency VIN = 12 V, VOUT = 1.53 V, IOUT = 10 A 85.5%