SLVAFP0 December   2023 LMR51610

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Specifications
    1. 2.1 Input Voltage Range
    2. 2.2 Output Current Range
  6. 3External Component Selection
    1. 3.1 Duty Cycle Calculation
    2. 3.2 Output Voltage Calculation
    3. 3.3 Inductor Selection
    4. 3.4 Input and Output Capacitor
    5. 3.5 Enable Level Shift
    6. 3.6 Output Clamp Diode
  7. 4Evaluation Results
    1. 4.1 Typical Performance
    2. 4.2 Loop Response Bench Verification
  8. 5Conclusion
  9. 6References
  10. 7LMR50410 Design Example
    1. 7.1 LMR50410 Output Current Range
    2. 7.2 LMR50410 Efficiency

3 External Component Selection

In this section, the inductor and output capacitor is designed in a practical application. The loop response is considered during the process. Note that VO is negative in all the equations.

Detailed design procedure is described based on a design example. For this design example, 400 kHz operating frequency LMR51610X is used with design specs as shown in Table 3-4. Figure 3-3 shows the reference design circuit.

GUID-20230904-SS0I-8QRG-HKFJ-XR81VWZ5LKVP-low.png Figure 3-1 Design Example Circuit
Table 3-1 Design Example Specification
VO (V) VIN (V) IO (A) fSW (kHz) Output Voltage Ripple ΔVO
VIN_min VIN_norm VIN_max
-12 12 24 48 0.4 400 0.5%*|VO| = 60 mV