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

8 List of Materials

Table 8-1 List of Materials
REFERENCE DESIGNATOR QTY DESCRIPTION SIZE MFR PARTNUMBER
C1–C3 3 Capacitor, ceramic, 2.2 μF, 50 V, X7R, 10% 1210 Std Std
C12, C22 2 Capacitor, ceramic, 5600 pF, 50 V, X7R, 10% 805 Std Std
C13 1 Capacitor, ceramic, 10 μF, 10 V, X5R, 10% 1210 Murata GRM32ER61A106KC01L
C14, C20 2 Capacitor, ceramic, 0.027 μF, 50 V, X7R, 10% 805 Std Std
C7, C15, C18, C19, C32 5 Capacitor, ceramic, 0.01 μF, 50 V, X7R, 10% 805 Std Std
C16 1 Capacitor, ceramic, 47 pF, 50 V, COG, 5% 805 Std Std
C21, C23 2 Capacitor, ceramic, 1000 pF, 50 V, COG, 5% 805 Std Std
C24–C31 8 Capacitor, ceramic, 100 μF, 6.3 V, X5R 1210 TDK C3225X5R0J107M
C4, C5 2 Capacitor, special polymer, 150 μF, 20, 20% 10.3 mm (F12) Panasonic EEFWA1D151P
C6, C8–C11, C17 6 Capacitor, ceramic, 0.1 μF, 50 V, X7R, 10% 805 Std Std
J1, J2, J3 3 Terminal block, 2 pin, 15 A, 5.1 mm 0.40 × 0.35 OST ED1609
JP1, JP2 2 Header, 3-pin, 100-mil spacing (36-pin strip) 0.100 × 3 Sullins PTC36SAAN
L1, L2 2 Inductor, SMT, 2.2 μH, 20 A, 4.6 mΩ 0.51 × 0.51 Vishay−Siliconix IHLP5050EZ−01
Q1, Q3 2 MOSFET, N-channel, 30 V, 18 A, 8.0 mΩ PWRPAKS0−8 Vishay−Siliconix Si7860DP
Q2, Q4 2 MOSFET, N-channel, 30 V, 29 A, 3 mΩ PWRPAKS0−8 Vishay−Siliconix Si7880DP
R1, R11 2 Resistor, chip, 10.0 kW, 1/10 W, 1% 805 Std Std
R10 1 Resistor, chip, 68.1 W, 1/10 W, 1% 805 Std Std
R5 1 Resistor, chip, 10.0 W, 1/10 W, 1% 805 Std Std
R12, R15 2 Resistor, chip, 1.5 W, 1/10 W, 1% 805 Std Std
R13 1 Resistor, chip, 20.0 kW, 1/10 W, 1% 805 Std Std
R14 1 Resistor, chip, 14.0 kW, 1/10 W, 1% 805 Std Std
R16, R7 2 Resistor, chip, 49.9 W, 1/10 W, 1% 805 Std Std
R2 1 Resistor, chip, 14 W, 1/10 W, 1% 805 Std Std
R3 1 Resistor, chip, 3.48 kW, 1/10 W, 1% 805 Std Std
R4, R8 2 Resistor, chip, 1.10 kW, 1/10 W, 1% 805 Std Std
R6 1 Resistor, chip, 100 kW, 1/10 W, 1% 805 Std Std
R9 1 Resistor, chip, 13.0 kW, 1/10 W, 1% 805 Std Std
TP1–TP10 10 Test point, 0.062 hole 0.25 Keystone 5012
TP11,TP12 2 Adaptor, 3.5-mm probe clip (or 131−5031−00) 0.2 Tektronix 131−4244−00
U1 1 IC, dual-channel synchronous step-down PWM controller DBT30 TI TPS5124DBT
1 PCB, 4 in × 3.2 in × .062 in Any HPA053