| 摘要 |
<p>An LED backlight drive circuit, including a plurality of LED twinkle lights (21) connected in parallel, a constant current control circuit (22) used for controlling the magnitude of the current passing through each of the LED twinkle lights (21) as the same, and a plurality of constant voltage units (28) of the same number as the number of LED twinkle lights (21). The plurality of constant voltage units (28) are respectively connected between the plurality of LED twinkle lights (21) and the constant current control circuit (22). A constant voltage unit (28) includes a MOS tube (Q3) and a first operational amplifier (OP3). The drain electrode of the MOS tube (Q3) is connected with the negative electrode of a LED twinkle light (21); the grid electrode thereof is connected with the output end of the first operational amplifier (OP3); and the source electrode thereof is connected with the constant current control circuit (22). The positive phase input end of the first operational amplifier (OP3) accesses a reference voltage (V2), and the negative phase input end thereof is connected with the source electrode of the MOS tube (Q3). The LED backlight drive circuit has a relatively high stability.</p> |
