CTX210607-R

更新时间： 2024-11-09 06:51:11

品牌	Logo	应用领域
库柏 - COOPER		变压器电力变压器电源变压器
页数	文件大小	规格书
4页	563K
描述
CCFL Transformer Application Note

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CTX210607-R 技术参数

是否无铅：	不含铅	生命周期：	Transferred
包装说明：	ROHS COMPLIANT	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8504.31.40.35
风险等级：	5.06	Is Samacsys：	N
其他特性：	HEIGHT DIMENSION INCLUDES TERMINAL ALSO	中心点击功能1：	NO
中心点击功能2：	NO	高度：	7.1 mm
长度：	21 mm	安装特点：	SURFACE MOUNT
次级绕组数量：	1	最大工作频率：	80 kHz
最小工作频率：	40 kHz	最高工作温度：	70 °C
最低工作温度：		输出电流 1：	0.011 A
输出电压 1：	1340 V	包装方法：	BULK
物理尺寸：	L21.0XB16.5XH7.1 (mm)	表面贴装：	YES
变压器类型：	POWER TRANSFORMER	VA 额定值：	6 VA
宽度：	16.5 mm	Base Number Matches：	1

CTX210607-R 数据手册

CCFL Transformer Application Note

Cold Cathode Fluorescent Lamps (CCFLs) are used to illuminate Liquid

Crystal Displays (LCDs). The LCD display is used in laptop computers, gas

pumps, automobiles, test equipment, PDAs and medical instruments.

CCFLs are small, efficient and inexpensive. The lamp must be driven by a

specialized power supply. High sinusoidal AC voltage is needed to start the

lamps, but once started, the voltage drops to a lower level. CCFL circuits

are usually powered from a low voltage DC source of 5-12V. The DC to AC

power supply needs a transformer to change low DC input voltage to high

sinusoidal AC voltage.

The Cooper Bussmann^®Coiltronics^®brand CCFL transformers are

designed to work with inexpensive Royer class self-oscillating circuits. The

Royer circuit works with input voltage from 2.5 to 20Vdc and is capable of

producing 90% efficiency above 5Vdc input.

Royer Diagram

Transformer Selection

The CCFL lamp manufacturer supplies the following lamp characteristics:

1. Strike voltage (V

)

strike

2. Running voltage (V

)

run

3. Frequency of operation (F

4. Power (W)

)

res

5. Current (I

)

lamp

The first step is to select the transformer according to the power

requirement from the catalog.

The second step is to decide the termination.

A current-fed, push-pull topology is commonly used to power the CCFL

transformer. This topology accommodates a wide input voltage and

consists of a resonant push-pull stage, a Pulse-Width-Modulated (PWM)

buck-derived control stage and a high-voltage secondary stage. The push-

pull stage consists of transistors Q2 and Q3 to drive the center-tapped

transformer T1. The transistors are driven 180° out of phase at 50% duty

cycle with an auxiliary winding on the transformer. A resonant tank is

formed between the primary inductance of the transformer and a low-

loss, external resonant bulk capacitor C1. The resonant tank provides a

sinusoidal voltage to the transformer’s primary winding and sets the

system’s operating frequency.

Use this formula to find the turn ratio needed to obtain the strike voltage of

the lamp.

π ×V_inmin

V_strike

×TR

TR = Turns ratio

= Battery voltage

The high voltage at the secondary of transformer is used to ignite and

operate the lamp. Since the ignition or “strike voltage” is higher than the

operating voltage, a high voltage ballast capacitor C2 is required to allow

a voltage difference between the transformer secondary and the lamp. To

minimize lamp stress and improve efficiency, the striking voltage

waveforms should be sinusoidal.

in min

12 3 4

中文翻译

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