Heat regulating device and method for D-type audio amplifier and D-type audio amplifier with heat regulation
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- RICHTEK TECH
- Publication Date
- 2013-09-11
- Estimated Expiration
- Not applicable · inactive patent
Smart Images
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Abstract
Description
technical field
[0001] The present invention relates to a class D amplifier, in particular, an over temperature protection (Over Temperature Protection; OTP) for a class D audio amplifier. Background technique
[0002] Generally, Class D audio amplifiers are equipped with an overheating protection circuit to prevent them from being damaged or burned due to overheating. Such as figure 1 As shown, when the overheat protection circuit 12 detects that the operating temperature of the amplifier exceeds a default value (usually 150° C.), it sends a shutdown signal to shut down the gate driver 10 . Although this mechanism can protect the amplifier from burning out, it also causes the current supply to the load 11 to be cut off instantaneously, thus generating a pop, which makes the user feel uncomfortable in hearing.
[0003] To reduce plosives, known class D audio amplifiers are provided with filters to filter out plosives. But even with the crackle removed, the momentary inter...