RETAINING CIRCUIT AND LIGHT EMITTING DEVICE DRIVER CIRCUIT WITH RETAINING CIRCUIT

摘要

A retaining circuit includes: a low dropout regulator (LDO) circuit for generating a primary operation voltage, a secondary operation voltage generation (SOVG) circuit, and a memory circuit. The SOVG circuit generates a secondary operation voltage, and the memory circuit is powered by the secondary operation voltage to store at least one operation parameter, such that when the primary operation voltage is lower than a non-controlled level, the memory circuit holds the operation parameter to sustain operation.

主权项

1. A retaining circuit, comprising:
a low dropout regulator (LDO) circuit, for converting rectified input voltage to a primary operation voltage; a secondary operation voltage generation circuit, which is coupled. to the LDO circuit, for generating a secondary operation voltage according to the primary operation voltage; and a memory circuit, which is coupled to the secondary operation voltage generation circuit, and powered by the secondary operation voltage to store at least one operation parameter; wherein the primary operation. voltage is supplied to an operation circuit in a normal operation mode whereby the operation circuit operates according to the operation parameter, and when the primary operation voltage is lower than a non-controlled level whereby the operation circuit is in a non-controlled mode wherein the operation circuit can not perform a basic operation and loses the operation parameter, the memory circuit holds the operation parameter such that, after the operation circuit resumes the normal operation mode from he non-controlled mode, the operation circuit retrieves the operation parameter from the memory circuit to sustain operation.