this ic is a white led driver for lcd backlight. it has 4ch current drivers for led drive, making it ideal for high brightness led drive. led pin maximum voltage is 50v, making it suitable for driving medium lcd panels. the dimming is controlled by the pwm signal and can be set up to 20,000: 1@100hz. it also supports analog dimming and can accommodate even higher brightness ranges by combining with pwm dimming. dc/dc converters can be controlled for boost applications, and the input operating voltage range is 4.5v to 48.0v.

主要规格

 
型号 | bd83a14efv-me2
status | 推荐品
封装 | htssop-b24
包装数量 | 2000
最小独立包装数量 | 2000
包装形态 | taping
rohs |

功能安全:

ag旗舰平台尊龙
类别 : fs supportive
a product that has been developed for automotive use and is capable of supporting safety analysis with regard to the functional safety.

特性:

topology

boost

vin(min.)[v]

4.5

vin(max.)[v]

48

per channel drive(max.)[ma]

150

number of outputs

4

vout(max.)[v]

50

frequency(max.)[mhz]

2.42

synchronous

yes

integrated fet

no

dimming

pwm / analog

ishutdown(typ.)[µa]

0

operating temperature (min.)[°c]

-40

operating temperature (max.)[°c]

125

package size [mm]

7.8x7.6 (t=1)

common standard

aec-q100 (automotive grade)

特点:

  • aec-q100 qualified (grade 1)
  • functional safety supportive automotive products
  • built-in 4ch current driver for led driver
  • current mode boost dc/dc converter
  • load switch (m1) control pin
  • dc dimming function by pulse input
  • pwm dimming
    (20,000: 1@100hz, 100hz to 25khz)
  • spread spectrum function
  • dc/dc converter oscillation frequency external synchronization function
  • lsi protect functions (uvlo, ovp, tsd, ocp)
  • led anode/cathode short circuit protection function
  • led open/short protection function

产品概要

 

背景

近年来,随着adas(高级驾驶辅助系统)的发展和车载信息娱乐系统的功能增加,车载显示器的尺寸日趋增大。这就要求用于车载显示器液晶背光的led驱动器具有更高的驱动效率,能够在提高额定输出电流的同时降低功耗。此外,如果车载显示器出现闪烁,其视认性将会降低,相关应用将处于不安全的状态,因此要求led驱动器还要具有高可靠性。然而,传统的led驱动器,存在ic本身功耗大和pwm调光时有可能发生闪烁等问题。对此,rohm通过采用自有的低功耗技术和无缝pwm调光技术,成功开发出功耗低、而且从低亮度到高亮度区间均难以发生闪烁的液晶背光led驱动器。

概要

产品通过采用rohm自有的低功耗技术,成功降低了led驱动器电流控制电路中的损耗。因此,在常规的规格条件下(led电路电流:80ma/ch,电源电压:12v),相比以往产品,ic整体的功耗可降低20%左右,在配有中、大型车载显示器的应用中使用这些产品,有助于进一步改善此类应用的关键问题——功耗。另外,配备dc调光和pwm调光两种调光方式,可以支持多种规格。而且,pwm调光还采用了rohm自有的无缝pwm调光技术,从低亮度区间到高亮度区间,不需要切换其电流反馈模式。采用普通pwm调光方式时,低亮度和高亮度时的电流反馈模式切换是造成闪烁的原因。此次的产品无需电流反馈模式的切换,因而可以降低发生闪烁的风险,有助于提高应用产品的可靠性。

应用示例

  • ・电子后视镜(侧后视镜、内后视镜)
  • ・组合仪表
  • ・车载信息娱乐系统
  • ・抬头显示器(hud)

可支持五英寸到十多英寸等多种尺寸的显示器。

reference design / application evaluation kit

 
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