FAN7311BMX

更新时间： 2024-01-13 11:02:00

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管驱动
页数	文件大小	规格书
14页	496K
描述
LCD Backlight Inverter Drive IC

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中文翻译

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技术参数
数据手册

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FAN7311BMX 技术参数

是否Rohs认证：	符合	生命周期：	Transferred
零件包装代码：	DIP	包装说明：	LEAD FREE, MS-001AE, DIP-20
针数：	20	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	8.44	接口集成电路类型：	LIQUID CRYSTAL DISPLAY DRIVER
JESD-30 代码：	R-PDIP-T20	长度：	28.695 mm
功能数量：	1	区段数：	4
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-25 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	认证状态：	Not Qualified
座面最大高度：	4.06 mm	最大供电电压：	25.5 V
最小供电电压：	5 V	标称供电电压：	12 V
表面贴装：	NO	温度等级：	COMMERCIAL EXTENDED
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	宽度：	7.62 mm
Base Number Matches：	1

FAN7311BMX 数据手册

Function Description

UVLO: The under-voltage lockout circuit guarantees sta-

ble operation of the IC’s control circuit by stopping and

starting it as a function of the V_INvalue. The UVLO cir-

cuit turns on the control circuit when V_INexceeds 5V.

When V_INis lower than 5V, the IC’s standby current is

less than 200µA.

ENA: Applying voltage higher than 2V to the ENA pin

enables operation of the IC. Applying voltage lower than

0.7V to the ENA pin disables operation of the inverter.

Soft-Start: The soft-start function requires that the S_S

pin is connected through a capacitor to GND. A soft-start

circuit ensures a gradual increase in the input and output

power. The capacitor connected to the S_S pin deter-

mines the rate at which the duty ratio rises. It is charged

by a 6µA current source.

Figure 4. Main Oscillator Waveform

Burst Oscillator & Burst Dimming: The timing capaci-

tors (BCTs) are charged by the reference current source,

which is formed by the timing resistor (RT). The timing

resistor’s voltage is regulated at 1.25V. The sawtooth

waveform charges up to 2V. Once this voltage is

reached, the capacitors begin discharging down to 0.5V.

Next, the timing capacitors start charging again and a

new switching cycle begins. The burst dimming fre-

quency can be programmed by adjusting the RT and

BCT values. The burst dimming frequency can be calcu-

lated as shown in Equation 2.

3.75

(2)

f^burst=

96 ⋅RT ⋅CT

Figure 3. Soft-Start During Initial Operation

To avoid visible flicker, the burst dimming frequency

should be greater than 120Hz.

Main Oscillator: The timing capacitors (CTs) are

charged by the reference current source, which is

formed by the timing resistor (RT). The timing resistor’s

voltage is regulated at 1.25V. The sawtooth waveform

charges up to 2V. Once this voltage is reached, the

capacitors begin discharging down to 0.5V. Next, the tim-

ing capacitors start charging again and a new switching

cycle begins. The main frequency can be programmed

by adjusting the RT and CT values. The main frequency

can be calculated as shown below.

By comparing the input of BDIM pin with the 0.5~2V tri-

angular wave of the burst oscillator, the PWM pulses for

burst dimming. The PWM pulse controls EA_OUT’s volt-

age by summing 85µA into the EA_IN pin.

(1)

f^op=

32 ⋅ RT ⋅CT

FAN7311B Rev. 1.0.0

www.fairchildsemi.com

1...4 5 678 9 10...14

中文翻译

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与FAN7311BMX相关器件

型号	品牌	描述	获取价格	数据表
FAN7311G	FAIRCHILD	LCD Backlight Inverter Drive IC	获取价格
FAN7311G	ROCHESTER	LIQUID CRYSTAL DISPLAY DRIVER, PDSO20, LEAD FREE, SSOP-20	获取价格
FAN7311GX	ROCHESTER	LIQUID CRYSTAL DISPLAY DRIVER, PDSO20, LEAD FREE, SSOP-20	获取价格
FAN7311GX	FAIRCHILD	LCD Backlight Inverter Drive IC	获取价格
FAN7311M	FAIRCHILD	LCD Backlight Inverter Drive IC	获取价格
FAN7311MX	FAIRCHILD	LCD Backlight Inverter Drive IC	获取价格

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