OZ9901 схема включения, описание
Микросхема OZ9901, Производитель- O2micro®
• Integrated 3A, 0.2Ω switching MOSFET
• Integrated VGH and VGL charge pump regulators
• Adjustable VGH Delay
• Operational ampliﬁ er for VCOM buffer
• Open-drain reset output for TCON
• 1.2MHz ﬁ xed switching frequency boost converter with soft start and adjustable
• Thermal protection
OZ9901 offers a complete power supply solution for TFT LCD panel applications. The
LCD Bias Supply Controller consists of a high performance boost converter, open
drain reset output, charge-pump regulators for VGH and VGL, operational ampliﬁ er,
input voltage detector and a logic-controlled gate-on pulse modulator. The boost con-
verter operates using current mode control, and offers fast line and load responses for
LCD bias supplies.
The integrated charge pumps provide a regulated supply for the panel gate driver ICs.
The charge-pump regulators provide a positive gate-on supply voltage (VGH) and
negative gate-off supply voltage (VGL).
The operational ampliﬁ er works as a VCOM buffer and supplies a high output current,
fast slew rate and wide bandwidth for driving capacitive loads.
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