Switching Power Supply Current-Limit Latchup(3 of 6)

Solvability

Reduction of the load at start-up, or static, dynamic, or adaptive modification of the start-up trajectory or current limit. The following can be used keep the source/load lines from crossing.

• Start-up into no load or a reduced load.
• Prevent operation at low input voltages (hysteresis is usually desirable).
• Extend or remove the current limit during start-up (not applicable to inherently current-limited sources).
• Limit the maximum duty cycle of the switching-mode regulator during start-up.
• Use adaptive control to limit the duty-cycle as a function of input voltage.

Do not use this information for design without independent verification of the information.

Editor: Jerrold Foutz