Datasheet > 电源电路 > 开关式稳压器或控制器> BD6072HFN-TR

BD6072HFN-TR

更新时间： 2024-02-09 05:37:29

品牌	Logo	应用领域
罗姆 - ROHM		显示驱动器转换器驱动程序和接口接口集成电路脉冲光电二极管
页数	文件大小	规格书
17页	545K
描述
Boost DC/DC converter, Adjustment of brightness by external PWM pulse

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技术参数
数据手册

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BD6072HFN-TR 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	HVSSOF,	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
Factory Lead Time：	10 weeks	风险等级：	1.65
接口集成电路类型：	LED DISPLAY DRIVER	JESD-30 代码：	R-PDSO-F8
长度：	2.9 mm	复用显示功能：	NO
功能数量：	1	区段数：	4
端子数量：	8	最高工作温度：	85 °C
最低工作温度：	-30 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	HVSSOF	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	NOT SPECIFIED
座面最大高度：	0.6 mm	最大供电电压：	5.5 V
最小供电电压：	2.7 V	标称供电电压：	3.6 V
表面贴装：	YES	温度等级：	OTHER
端子形式：	FLAT	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	2.8 mm	Base Number Matches：	1

BD6072HFN-TR 数据手册

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BD6067GU

●Release Circuit Protection

1)Operation

BD6067GU is a constant frequency PWM current mode DC/DC converter. It is shown in the block diagram of Page 3 In a

PWM comparator forming one of the PWM current mode features, one is an error element from the error amplifier and

another is an element produced by superimposing the inductor current on a slope waveform that prevents sub-harmonic

oscillation. This output controls Q1 via the RS latch. Energy is stored in an external inductor whileQ1 is ON and then it is

moved to the COUT capacitor via D1 while Q1 is OFF. In this way, voltage VOUT higher than input voltage VIN can be

obtained. Because the above operation is performed in a way that the VFB pin voltage equals the VFB voltage, the boost

voltage is dominantly determined by the expression “Vf × number of LEDs.”

VOUT voltage = (Vf × number of LEDs) + VFB

2)LED current control

The LED current is determined depending on the VFB pin voltage “VFB” and the resistance connected to VFB.

ILED is given below.

ILED =200mV/ R1

ILED[mA]

BD6067GU R1 [Ω]

3)Dimming control

▪ Control by PWM signal

The startup condition of BD6067GU is controlled via the EN pin. It is powered OFF at 0.4V or less and powered ON at

1.4V or more.

As shown in Figure 12, brightness is controlled in the BD6067GU via the PWM signal input the EN pin. In this way, the

LED current is controlled in a range from 0 to the maximum current. The average LED current increases in proportion

to the Duty cycle of the PWM signal. In the PWM off cycle, no current dissipation takes place in IC and LEDs, resulting

in high efficiency. Duties below 5% and above 95% must no be used for brightness control because they significantly

affects the leading and trailing edges. BD6067GU standard PWM frequency ranges from 100Hz to 300Hz.

22μH

VIN

VIN SW

VOUT

1μF

BD6067GU

VFB

VDAC

ILED

GNDA

GND

PWM

100Hz~300Hz

10Ω

Figure 12. Example of Brightness Control by PWM signal at the EN Pin

www.rohm.com

TSZ02201-0G3G0C200080-1-2

5.OCT.2012 Rev.001

7/14

TSZ22111・15・001

1...4 5 678 9 10...17

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