Datasheet > A8519-1

A8519-1

更新时间： 2024-02-17 05:04:22

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
35页	4309K
描述
Fully integrated 42 V MOSFET for boost converter

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数据手册

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A8519-1 数据手册

A8519 and

A8519-1

Wide Input Voltage Range, High-Efficiency,

Fault-Tolerant LED Driver

Step 4a: Determine the Duty Cycle.

I_L= I_IN(max)× K_ripple

V_IN(min)

(V_OUT(ovp)+ V )

D_MAX= 1 –

I_L= 1.06 A × 0.3 = 0.318 A

(V_IN(min)× D_MAX

I_L× f_SW)

)

L =

D_MAX= 1 –

= 0.75

(39.9 + 0.4)

10 V

0.318 A × 2 MHz

L =

× 0.75 = 11.79 µH

Step 4b: Determine the maximum and minimum input current to

the system. The minimum input current will dictate the inductor

value. The maximum current rating will dictate the current rating

of the inductor.

Double-check to make sure that ½ current ripple is less than

I_IN(min)

I_IN(min)> ½ DI_L

_OUT(ovp)× I_OUT

I_IN(max)

0.625 A > 0.159 A

IN(min)

A good inductor value to use would be 10 µH.

I_OUT= #Channels × I_LED

Step 4d: This step is used to verify that there is sufficient slope

compensation for the inductor chosen. 6 A/µs slope compensation

value is applied inside the IC at 2 MHz switching frequency. The

slope compensation at any switching frequency can be deter-

mined by the following formula:

I_OUT= 4 × 0.060 A = 0.240 A

A good approximation of efficiency η can be taken from the

efficiency curves located on page 10. A value of 90% is a good

starting approximation.

6 A/µs × f_SW

Slope Comp =

2 × 10 ⁶

39.9 V × 240 mA

10 V × 0.90

I_IN(max)

= 1.06 A

Next, insert the inductor value used in the design:

V_OUT× I_OUT

I_IN(max)

V_IN(max)

V_IN(min)× D_MAX

ΔI_L(used)

L(used) × f_SW

V_OUT= 10 × 3.2 V + 0.85 V = 32.85 V

10 V × 0.75

10 µH × 2 MHz

32.85 V × 240 mA

ΔI_L(used)

= 0.375 A

I_IN(min)

= 0.625 A

14 V × 0.90

ΔI_L(used)× ΔS × 10^-6

Required Min Slope =

Step 4c: Determining the inductor value. To ensure that the

inductor operates in continuous conduction mode, the value of

the inductor needs to be set such that the ½ inductor ripple cur-

rent is not greater than the average minimum input current. A

first pass calculation for K_rippleshould be 30% of the maximum

inductor current.

× (1 – D_MAX

)

f_SW

where ΔS is taken from the following formula:

0.18

ΔS = 1 –

D_MAX

ΔS = 0.76

0.375 × 0.76 × 10^-6

Required Min Slope =

= 2.28 A/µs

× (1 – 0.75)

2 MHz

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

1...26 27 282930 31 32...35

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与A8519-1相关器件

型号	品牌	获取价格	描述	数据表
A8519KETTR-R	ALLEGRO	获取价格	Fully integrated 42 V MOSFET for boost converter
A8519KETTR-R-1	ALLEGRO	获取价格	Fully integrated 42 V MOSFET for boost converter
A8519KLPTR-T	ALLEGRO	获取价格	Fully integrated 42 V MOSFET for boost converter
A8519KLPTR-T-1	ALLEGRO	获取价格	Fully integrated 42 V MOSFET for boost converter
A8520E24A91	ANAREN	获取价格	Operates in the 2.4GHz ISM band
A8520E24A91-EM2	ANAREN	获取价格	The A8520E24A91-EM2 is a high-performance
A8521	ALLEGRO	获取价格	The A8521 is a multi-output white LED driver for small-size LCD backlighting.
A8521KLPTR-T	ALLEGRO	获取价格	The A8521 is a multi-output white LED driver for small-size LCD backlighting.
A8530	ALLEGRO	获取价格	Ultracompact 6-Channel Backlight and Flash/Torch White LED Driver
A8530EES-T	ALLEGRO	获取价格	Display Driver, PQCC16

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