Datasheet > A8519-1

A8519-1

更新时间： 2024-02-18 18:27:12

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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A8519-1 数据手册

A8519 and

A8519-1

Wide Input Voltage Range, High-Efficiency,

Fault-Tolerant LED Driver

Step 8: Selection of input capacitor. The input capacitor needs to

be selected such that it provides good filtering of the input volt-

age waveform. A good rule of thumb is to set the input voltage

ripple ΔV_INto be 1% of the minimum input voltage. The mini-

mum input capacitor requirements are as follows:

larger input capacitor. A larger input capacitor is also required to

have stable input voltage during line transients. Combinations of

aluminum electrolytic and ceramic capacitors can be used.

Step 9: Choosing the input disconnect switch components.

Set the input disconnect current limit to 4.25 A.

ΔI_L(used)

8 × f_SW× ΔV

C_IN=

0.11 V

R_SC=

= 0.0259 Ω

4.25 A

0.375 A

8 × 2 MHz × 0.1 V

The R_SCchosen is 0.024 ohms. Therefore, the voltage drop across

R_SCis:

C_IN=

= 0.234 µF

= 0.1 A

ΔI_L(used)

I_IN(max)

V_SC= 4.25 A×0.024 Ω = 0.102 V

V_VSENSE(trip)– V_SC

I_OUT

C_IN(rms)

(1 – D_MAX)× 12

R_adj=

I_adj

0.375 A

0.240 A ×

0.11 V – 0.102 V

1.06 A

R_adj=

= 372 Ω

C_IN(rms)

= 0.1 A

21.5 µA

(1 – 0.75) × 12

A value of 383 W was chosen for this design. The disconnect

switch Q1 works as on or off. Therefore, the R_adjvalue is not

really critical.

A good ceramic input capacitor with ratings of 50 V / 2.2 µF or

50 V / 4.7 µF will suffice for this application.

For the input disconnect switch, an AO4421 6.2 A / 60 V P-chan-

nel MOSFET is selected.

Vendor

Murata

Value

Part Number

4.7 µF / 50 V

2.2 µF / 50 V

GRM32ER71H475KA88L

GRM31CR71H225KA88L

To achieve proper operation at low dimming ratios, connect an

RC filter to the VOUT pin. Use R = 10 kW and C = 47 pF.

If long wires are used for the input, it is necessary to use a much

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

1...28 29 303132 33 34 35

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