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ZXSC400
Layout considerations
Layout is critical for the circuit to function in the most
efficient manner in terms of electrical efficiency,
thermal considerations and noise.
For ‘ step-up converters ’ there are four main current
loops, the input loop, power-switch loop, rectifier loop
and output loop. The supply charging the input
capacitor forms the input loop. The power-switch loop
is defined when Q1 is ‘ on ’ , current flows from the input
through the inductor, Q1, R SENSE and to ground. When
Q1 is ‘ off ’ , the energy stored in the inductor is
transferred to the output capacitor and load via D1,
forming the rectifier loop. The output loop is formed by
the output capacitor supplying the load when Q1 is
switched back off.
ISSUE 1 - JANUARY 2003
9
To optimise for best performance each of these loops
kept separate from each other and interconnected with
short, thick traces thus minimising parasitic
inductance, capacitance and resistance. Also the
R SENSE resistor should be connected, with minimum
trace length, between emitter lead of Q1 and ground,
again minimising stray parasitics.
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