The inverter is also adapted to reduce ripple current.

A first current mirror (16) is referred to the supply node and mirrors a current (I1) to a second node (20), the mirrored current (I3) including a ripple current induced by the ripple voltage.

The ripple current is adjusted to obtain correlation between the operating switching frequency and the reference frequency.

A ripple current reduction circuit includes a supply node (10) coupled to the output of a high ripple voltage source such as a charge pump (14).

The switching converter ripple current is varied by a frequency comparator (78) in response to a comparison of the switching frequency to a reference frequency.

Based on the operation of the sensing unit, the series regulator, which has a poor power efficiency while exhibiting an excellent regulation performance, supplies or absorbs only a small amount of ripple current.

In a second mode used for continuous operation, the switching is at low frequency and ripple current caused by a current limiting circuit is diverted away from the lamp (11) by the capacitor (7).

The LED driving circuit and the LED driving chip of the solution can restrain a current ripple output at a low frequency, and solve the problem of low frequency blink in a process of supplying power to an LED.

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