AN1061设计与L4978，催效率的DC-DC 2A converter\

AN1061设计与L4978，催效率的DC-DC 2A converter\

AN1061
APPLICATION NOTE
DESIGNING WITH L4978,
2A HIGH EFFICIENCY DC-DC CONVERTERY

1 INTRODUCTION
The L4978 is a 2A monolithic dc-dc converter, step- down , operating at fix frequency contin-
uous mode.
It is realised in BCD60 II technology, and it’s available in two plastic packages, MINIDIP and
SO16L.
One direct fixed output voltage at 3.3V ±1% is available, adjustable for higher output voltage
values, till 40V, by an external voltage divider.
The operating input supply voltage ranges from 8V to 55V, while the absolute value, with no
load, is 60V.
New internal design solutions and superior technology perfor