OZ528 назначение, описание, схема включения

Микросхема OZ528, Производитель- O2micro®

FEATURES OZ528
• High power DC/DC power converter
• Operation frequency synchronization
• Optional spread spectrum operation
frequency
• Thermal, over-current, and over load
protection
• Abnormal pulled-up output protection
• LED fault status output
Buck Converter
• Integrated power MOSFET
• Current mode control
• Soft start function
Two Independent Boost Converters
• Integrated power MOSFET
• Current mode control
• Wide output range: up to 25.0V
• Adjustable power on/off delay time
• Soft start function
Negative Charge Pump
• Voltage mode control
• Adjustable power on/off delay time

GENERAL DESCRIPTION OZ528
The OZ528 is a LCD panel bias power supply controller and is suitable for GPS ap-
plication. It generates four voltage rails for a TFT LCD panel. It includes a boost con-
verter to provide the source voltage, buck converter to provide the logic voltage for
the system, boost converter for positive gate voltage and a negative charge-pump
driver to provide adjustable regulated output voltages to bias the TFT panel.
IC has power-on sequencing. The buck converter is the fi rst to start after the IC is
enabled. Two boost converters and a negative charge pump are enabled when their
corresponding TIMER reaches approximately 2.0V.

Схема включения OZ528

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