Datasheet > A8515

A8515

更新时间： 2024-01-12 08:05:04

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器显示器
页数	文件大小	规格书
34页	1183K
描述
The A8515 is a multi-output white LED (WLED) driver for LCD backlighting in consumer and industrial displays.

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A8515 数据手册

Wide Input Voltage Range, High Efficiency

Fault Tolerant LED Driver

A8515

The rms current requirement of the coupling capacitor is given

by:

Step 9 Selecting coupling capacitor C_SW. The minimum capaci-

tance of C_SWis related to the maximum voltage ripple allowed

across it:

1 – D(max)

D(max)

(51)

I_IN(max)

I_CSWrms

I_OUTD_MAX

C_SW

(50)

f_SW

∆V_SW

1 – 0.765

0.765

0.848 (A)

0.47 A

0.24 (A) 0.765

0.92 μF

0.1 (V) 2 (MHz)

The voltage rating of the coupling capacitor must be greater than

V_IN(max), or 16 V in this case. A ceramic capacitor rated for

2.2 μF 25 V will suffice for this application.

10 μH

2 A / 60 V

OUT

6 to 14 V

2.2 μF / 25 V

0.056 Ω

4.7 μF

50 V

OUT

ADJ

590 Ω

OVP

2.2 μF / 25 V

GATE

39.2kΩ

VSENSE

VIN

VDD

OVP

A8515

PAD

VDD

100 kΩ

0.1 μF

FAULT

EN/PWM

APWM

LED1

LED2

ISET

COMP

150 Ω

FSET

ISET

10 kΩ

FSET

8.25 kΩ

AGND

PGND

120pF

0.47 μF

Figure 33. Typical application showing SEPIC configuration, with accurate input current sense, and VSENSE

to GND protection

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

1...29 30 313233 34

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