SHUTDOWN

INPUT

ON

OFF

0

+5V

VCC

COMP/SD

LM3477

COMP/SD

LM3477

SHUTDOWN

INPUT

OFF

ON

0

+5V

LM3477

SNVS141K – OCTOBER 2000 – REVISED MARCH 2013

www.ti.com

Figure 23. Implementing Shutdown in LM3477

Figure 24. Implementing Shutdown in LM3477

Design Section

GENERAL

Power supply design involves making tradeoffs. To achieve performance specifications, limitations will be set on

component selection. The LM3477/A provides many degrees of flexibility in choosing external components to

accommodate various performance/component selection optimizations. For example, the internal slope

compensation can be externally increased to allow smaller inductances to be used. The design procedures that

follow provide instruction on how to select the external components in a typical LM3477/A buck circuit in

continuous conduction mode, as well as aid in the optimization of performance and/or component selection. See

Figure 25 for component reference and typical circuit. The LM3477/A may also be designed to operate in

discontinuous conduction mode.

14

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