| 摘要 |
A twin dimming controller for backlight system is disclosed. In the present invention, the output of pulse width modulation modulator is used as a reference voltage of error-feedback amplifier and frequency compensation loop in backlight controller having pulse dimming control, and meanwhile, the output of pulse width modulation modulator is sent to the output terminal of error-feedback amplifier and frequency compensation loop. Therefore, by utilizing the present invention, the peaked lamp current and the working period of lamp current are adjusted at the same time for adjusting the output power of lamp, and with the same working period of lamp current, the dimming range is broader, and the minimum power consumption of lamp is decreased substantially.
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