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AL9910ASP-13

更新时间： 2024-01-05 09:39:32

品牌	Logo	应用领域
美台 - DIODES		显示驱动器驱动程序和接口接口集成电路光电二极管高压
页数	文件大小	规格书
14页	213K
描述
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER

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技术参数
数据手册

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AL9910ASP-13 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	HLSOP, SOP8,.25	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	19 weeks
风险等级：	1.55	输入特性：	STANDARD
接口集成电路类型：	LED DISPLAY DRIVER	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e3	长度：	4.9 mm
湿度敏感等级：	1	复用显示功能：	NO
功能数量：	1	区段数：	2
端子数量：	8	最高工作温度：	105 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	HLSOP	封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, LOW PROFILE
峰值回流温度（摄氏度）：	260	电源：	20/500 V
认证状态：	Not Qualified	座面最大高度：	1.5 mm
子类别：	Display Drivers	最大供电电压：	500 V
最小供电电压：	20 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	3.9 mm	Base Number Matches：	1

AL9910ASP-13 数据手册

AL9910/AL9910A

UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED

DRIVER

Applications Information (Continued)

Setting Operating Frequency

The AL9910 is capable of operating over a 25 and 300 kHz switching frequency range. The switching frequency is

programmed by connecting an external resistor between R_OSCpin and ground. The corresponding oscillator period is:

R_osc+ 22

t_OSC

µs

with R_OSCin kΩ

The switching frequency is the reciprocal of the oscillator period. Typical values for R_OSCvary from 75kΩ to 1MΩ

When driving smaller numbers of LEDs, care should be taken to ensure that t_ON> t_BLANK. The simplest way to do this is to

reduce/limit the switching frequency by increasing the R_OSCvalue. Reducing the switching frequency will also improve the

efficiency.

When operating in buck mode the designer must keep in mind that the input voltage must be maintained higher than 2 times

the forward voltage drop across the LEDs. This limitation is related to the output current instability that may develop when the

AL9910 operates at a duty cycle greater than 0.5. This instability reveals itself as an oscillation of the output current at a sub-

harmonic (SBO) of the switching frequency.

The best solution is to adopt the so-called constant off-time operation as shown in Figure 2. The resistor (R_OSC) is, connected

to ground by default, to set operating frequency. To force the AL9910 to enter constant OFF time mode R_OSCis connected to

the gate of the external MOSFET. This will decrease the duty cycle from 50% by increasing the total period, t_OFF+ t_ON

V_IN

V_DD

V_IN

AL9910/A _GATE

PWM_D

R_OSC

GND

R_OSC

Figure 2. Constant off-time configuration

The oscillator period equation above now defines the AL9910 off time, t_OFF

When using this mode the nominal switching frequency is chosen and from the nominal input and output voltages the off-time

can be calculated:

⎛

⎜

⎝

⎞

⎟

⎠

V_OUT(nom)

⎜

t_OFF= 1−

∗

V_IN(nom)

f_OSC

From this the timing resistor, R_OSC, can be calculated: R_OSC

(

t_OFF(µs)∗ 25 − 22(kΩ)

)

7 of 14

www.diodes.com

March 2011

AL9910/AL9910A

Document number: DS 35103 Rev. 2 - 2

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

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