Datasheet > BD8374EFJ-ME2

BD8374EFJ-ME2

更新时间： 2022-02-26 11:29:18

品牌	Logo	应用领域
罗姆 - ROHM		/
页数	文件大小	规格书
29页	1223K
描述
50V 500mA 1ch Source Driver for Automotive

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中文翻译

获取价格

数据手册

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BD8374EFJ-ME2 数据手册

Daattaasshheeeett

BD8374HFP-M BD8374EFJ-M

(2) CRT Ramp down Time T2

CRT ramp down time is defined by discharge period due to external capacity CCRT and resistance (RCRT + RD1).

Make sure that T2 is set at not smaller than Min. pulse width 100μs(Min).

T2  C^CRT(R^CRTRD1)ln^{ VCRT_CHA}^[s]







^VCRT_DIS1

where:

RD1 is the CRT Terminal Discharge Resistance 1

50Ω (Typ)

VCRT_CHA is the CRT Terminal Discharge ON Voltage 1.1V (Typ)

VCRT_DIS1 is the CRT Terminal Discharge ON Voltage 13.0V (Typ)

(3) Dimming Frequency fPWM

PWM frequency is defined by T1 and T2.

PWM



[Hz]

T1 T2

(4) ON Duty (DON)

Like the above, PWM ON duty is defined by T1 and T2.

D^ON

T1 T2

(Ex) In case of fPWM = 518Hz and 6.7% Duty (Typ),

From fPWM=518Hz; T1 + T2 = 1 / fPWM = 1 / 518Hz = 1931μs

From ON Duty = 6.7%; CRT ramp up time T1 is T1 = (T1 + T2) × 0.933 = 1801.6μs

External capacity CCRT is;

CCRT = T1 × (ICRT / ∆VCRT) = 1800.7μs × 35μA / 1.9V ≒ 0.033μF

CRT ramp down time T2 is; T2 = (T1 + T2) × 0.067 = 129μs

External resistance RCRT is;

RCRT = －T2 / (C_CRT× ln(VCRT_CHA / VCRT_DIS)) － RD1 = －129usec / (0.033μF × ln(1.1 / 3.0) – 50Ω ≒ 3.9kΩ

In case where PWM signal is applied from external;

It is possible to directly input PWM signal from external microcomputer for Dimming.

Input PWM signal to CRT terminal. In that case, ’H’ level voltage of PWM signal should be equal to or higher than

VCRT_DIS2(4.0V(Typ)).

VIN_F

VIN

IOUT

VREF

OSC

VIN-0.180V

(Typ)

CRT

GND

PWM Signal Input

Figure 13. External Input of PWM Signal

www.rohm.com

TSZ02201-0G1G0C700310-1-2

2013.08.06 Rev.001

9/26

TSZ22111・15・001

1...6 7 8910 11 12...29

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