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BD8119FM-ME2

更新时间： 2024-02-13 18:43:57

品牌	Logo	应用领域
罗姆 - ROHM		显示驱动器稳压器驱动程序和接口开关接口集成电路光电二极管
页数	文件大小	规格书
21页	438K
描述
White Backlight LED Driver for Medium to Large LCD Panels (Switching Regulator Type)

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技术参数
数据手册

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BD8119FM-ME2 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Not Recommended	零件包装代码：	SOIC
包装说明：	ROHS COMPLIANT, HSOP-28	针数：	28
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.68
Is Samacsys：	N	接口集成电路类型：	LED DISPLAY DRIVER
JESD-30 代码：	R-PDSO-G28	长度：	18.5 mm
复用显示功能：	NO	功能数量：	1
区段数：	4	端子数量：	28
最高工作温度：	95 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	HSSOP
封装等效代码：	SOP28,.4,32	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, SHRINK PITCH	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	12 V	认证状态：	Not Qualified
子类别：	Display Drivers	最大供电电压：	30 V
最小供电电压：	5 V	标称供电电压：	12 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子形式：	GULL WING	端子节距：	0.8 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	7.5 mm	Base Number Matches：	1

BD8119FM-ME2 数据手册

Technical Note

BD8119FM-M

●Buck-Boost DC/DC controller

・Number of LEDs in series connection

Output voltage of the DCDC converter is controlled such that the forward voltage over each of the LEDs on the output is

set to 1.0V (Typ.). DCDC operation is performed only when the LED output is operating. When two or more LED outputs

are operating simultaneously, the LED voltage output is held at 1.0V (Typ.) per LED over the column of LEDs with the

highest VF value. The voltages of other LED outputs are increased only in relation to the fluctuation of voltage over this

column. Consideration should be given to the change in power dissipation due to variations in VF of the LEDs. Please

determine the allowable maximum VF variance of the total LEDs in series by using the description as shown below:

VF variation allowable voltage 3.7V(Typ.) = short detecting voltage 4.7V(Typ.) - LED control voltage 1.0V(Typ.)

The number of LEDs that can be connected in series is limited due to the open-circuit protection circuit, which engages at

85% of the set OVP voltage. Therefore, the maximum output voltage of the under normal operation becomes

30.6 V (= 36 V x 0.85, where (30.6 V – 1.0 V) / VF > N [maximum number of LEDs in series]).

・Over-voltage protection circuit (OVP)

The output of the DCDC converter should be connected to the OVP pin via a voltage divider. In determining an

appropriate trigger voltage of for OVP function, consider the total number of LEDs in series and the maximum variation in

VF. Also, bear in mind that over-current protection (OCP) is triggered at 0.85 x OVP trigger voltage. If the OVP function

engages, it will not release unless the DCDC voltage drops to 72.5% of the OVP trigger voltage. For example, if ROVP1

(output voltage side), ROVP2 (GND side), and DCDC voltage VOUT are conditions for OVP, then:

VOUT ≥ (ROVP1 + ROVP2) / ROVP2 x 2.0 V.

OVP will engage when VOUT > 32 V if ROVP1 = 330 kΩ and ROVP2 = 22 kΩ.

・Buck-boost DC/DC converter oscillation frequency (FOSC)

The regulator’s internal triangular wave oscillation frequency can be set via a resistor connected to the RT pin (pin 26).

This resistor determines the charge/discharge current to the internal capacitor, thereby changing the oscillating frequency.

Refer to the following theoretical formula when setting RT:

30 × 10⁶

RT [Ω]

fosc =

x α [kHz]

30 x 10⁶(V/A/S) is a constant (±16.6%) determined by the internal circuitry, and α is a correction factor that varies in

relation to RT: { RT: α = 50kΩ: 0.98, 60kΩ: 0.985, 70kΩ: 0.99, 80kΩ: 0.994, 90kΩ: 0.996, 100kΩ: 1.0, 50kΩ: 1.01, 200kΩ:

1.02, 300kΩ: 1.03, 400kΩ: 1.04, 500kΩ: 1.045 }

A resistor in the range of 62.6kΩ～523kΩ is recommended. Settings that deviate from the frequency range shown below

may cause switching to stop, and proper operation cannot be guaranteed.

550K

450K

350K

250K

150K

50K

100

200

300

400

500

600

700

800

RT [kΩ]

Fig.15 RT versus switching frequency

・External DC/DC converter oscillating frequency synchronization (FSYNC)

Do not switch from external to internal oscillation of the DC/DC converter if an external synchronization signal is present

on the SYNC pin. When the signal on the SYNC terminal is switched from high to low, a delay of about 30 µS (typ.)

occurs before the internal oscillation circuitry starts to operate (only the rising edge of the input clock signal on the SYNC

terminal is recognized). Moreover, if external input frequency is less than the internal oscillation frequency, the internal

oscillator will engage after the above-mentioned 30 µS (typ.) delay; thus, do not input a synchronization signal with a

frequency less than the internal oscillation frequency.

www.rohm.com

2010.08 - Rev.A

7/20

1...4 5 678 9 10...21

中文翻译

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