feature

Backlight Ballasts and Soft Dimming

Reduce the number of components

Wide range of working voltage 9- 30V

Precise voltage reference down to 3.4%

Low standby current (typ. 150 watts)

Soft start function

Dual PWM Control

Analog and pulse dimming functions

P-channel MOSFET driver

Open Lamp Regulation (OLR) Open Lamp Protection (OLP)

Buck+Royer topology

20 SSOPs

illustrate

The FAN 7548 implements a high-efficiency CCFL backlight power supply in a small footprint 20 SSOP package. Device Features Two-stage independent resonant tank control for multi-lamp designs. Reduced external parts count and system cost by integrating features such as feedback-controlled PWM driver bench, soft start, turn-on lamp regulation, turn-on lamp protection, UV low-E and self-synchronizing circuits between Buck and Royer stages . It includes an internal shunt regulator that allows it to operate from 9 volts to 30 volts at the input. Analog and pulsed dimming modes of operation are supported. It provides open light regulation, as well as open light protection

Internal block diagram

Absolute Maximum Ratings

Typical values are Vcc=12V, Ta=25 oC, min/max are -25 oC, Ta 85 oC, 9V, Vcc 30V unless otherwise specified.

Note:

1. Thermal resistance test board size: 76.2mm*114.3mm*1.6mm (1S0P) JEDEC standard: JESD51-3, JESD51-7

2. Assuming no ambient airflow

Electrical Characteristics

Typical values are Vcc=12V, Ta=25°C, min/max values are -25°C≤Ta≤85°C and 9V≤Vcc≤30V unless otherwise specified.