OZT1060 Datasheet – Phase-Shift PWM Controller IC

The OZT1060 is a Phase-Shift PWM Controller made by O2Micro International, supplied in an SOP 20 Pin Type package. The absolute maximum ratings table on this page lists the 6 limits from the manufacturer's datasheet that must not be exceeded. This page brings together the OZT1060 pinout and maximum ratings, with the full datasheet PDF to preview below or download.

OZT1060 is a high efficiency, Pulse Width Modulation (PWM) controller designed for both DC/DC and DC/AC high-voltage applications. The average current mode control is suitable for DC/DC converters where both voltage and current feedback are required, as well as for Cold Cathode Fluorescent Lamps (CCFL) backlight applications for small and large Liquid Crystal Displays (LCD).

OZT1060 operates in a zero-voltage switching mode that minimizes electromagnetic interference (EMI). In addition, OZT1060 achieves a high power-conversion efficiency resulting in a lower operating temperature and higher system reliability.

OZT1060 supports a wide input voltage range and provides a constant, user-defined, operating frequency, ensuring that the CCFLs operate at a fixed frequency. This eliminates interference among CCFLs and the LCD panel. Interference causes electromagnetic compatibility (EMC) problems and may create visual effects (waterfall) on LCD panels. The controller provides a phase-shift square wave output that is able to drive a full bridge power train.

OZT1060 utilizes a pulse width modulation (PWM) dimming method to achieve a wide dimming range. The IC performs the CCFL dimming function with an analog or low frequency PWM control. The PWM frequency is user- defined.

To avoid over-shoot and in-rush current to the CCFLs during ignition, a soft start function is provided for reliable CCFL operation.

The controller provides open-lamp protection and over-voltage protection, while providing an appropriate response for either open-lamp ignition or removal of a CCFL during normal operation. Intelligent open-lamp protection and over voltage protection provides design flexibility with various transformer characteristics. Open- lamp protection time is user-defined.

In addition, OZT1060 provides a shutdown delay function that will keep the inverter module in normal operation for a short period of time if the input voltage suddenly drops and subsequently resumes to a normal level. The shutdown delay time is user-defined.

OZT1060 provides under-voltage lockout protection and will disable the IC if VDDA falls below a threshold. OZT1060 will resume normal operation when VDDA exceeds the threshold. To reset the IC, toggle the enable (ENA) pin. OZT1060 operates with a standby current of approximately 200uA.