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FMMT619 开发手册 - Diodes（美台）
制造商:
Diodes（美台）
分类:
双极性晶体管
封装:
SOT-23
描述:
单晶体管 双极, NPN, 50 V, 140 MHz, 625 mW, 2 A, 450 hFE
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
FMMT619数据手册
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若手册格式错乱，请下载阅览PDF原文件
Figure 1
DN55-1
A High Efficiency Royer Driver for a Scanner CCFL
A practical application using Zetex’s
very low V
CEsat
transistor is discussed
here for driving a 4.5W CCFL
lamp(240.0mm x 3.0mm diameter) as
used in a scanner. The circuit can be
easily modified for CCFL lamps of other
sizes for use in large screen LCD
displays and notebook computers.
The complete circuit is shown in Figure
1. As it has been designed specially for
scanners, the circuit is powered from a
fixed 12.0V DC voltage to run at
maximum brightness. The ccfl lamp
used is a Harrison 240.0mm x 3.0mm
diameter unit.
The lamp current is measured at 5.0mA
corresponding to 370.0mA at the input.
Waveform across the lamp is a sinusoid.
The circuit operates at nominal 65.0kHz.
The efficiency measured with a dummy
load of 150.0KΩ pulling 5.0mA rms. is
greater than 80% enabling Zetex’s
SuperSOT-23 or SOT-323 transistors to
be used. No heatsinking is necessary
further reducing cost.
Design Note 55
Issue 1 July 2000
L1
100µH, Sumida CDH74-101JC
R1
2K7
Q1
FMMT619
Q2
FMMT619
C1
56nF
T1b
C2
T1a
SUMIDA type EPS115 /6379-T002
12V
22pF/3KV To 240.0mm x
3.0mm CCFL
1
5
6
72
3
4
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