Datasheet > ACT4303YH-T

ACT4303YH-T

更新时间： 2022-04-13 02:36:12

品牌	Logo	应用领域
技领 - ACTIVE-SEMI		转换器传感器
页数	文件大小	规格书
15页	622K
描述
30V/3A Sensorless CC/CV Step-Down DC/DC Converter

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数据手册

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ACT4303YH-T 数据手册

ACT4303

Active- Semi

Rev 0, 05-Dec-11

APPLICATIONS INFORMATION

CC Current Line Compensation

Output Voltage Setting

When operating at constant current mode, the

current limit increase slightly with input voltage. For

wide input voltage applications, a resistor R_Cis

added to compensate line change and keep output

high CC accuracy, as shown in Figure 3.

Figure 1:

Output Voltage Setting

Figure 3:

Iutput Line Compensation

Figure 1 shows the connections for setting the

output voltage. Select the proper ratio of the two

feedback resistors R_FB1and R_FB2based on the

output voltage. Typically, use R_FB2≈ 10kꢀ and

determine R_FB1from the following equation:

V_OUT

⎛

⎜

⎞

⎟

R_FB1= R_FB2

−1

Inductor Selection

(1)

0.808V

⎝

⎠

The inductor maintains a continuous current to the

output load. This inductor current has a ripple that is

dependent on the inductance value:

CC Current Setting

ACT4303 constant current value is set by a resistor

connected between the ISET pin and GND. The CC

output current is linearly proportional to the current

flowing out of the ISET pin. The voltage at ISET is

roughly 1V and the current gain from ISET to output

is roughly 25000 (25mA/1µA). To determine the

proper resistor for a desired current, please refer to

Figure 2 below.

Higher inductance reduces the peak-to-peak ripple

current. The trade off for high inductance value is

the increase in inductor core size and series

resistance, and the reduction in current handling

capability. In general, select an inductance value L

based on ripple current requirement:

(

)

_OUT× V V_OUT

(2)

L =

Figure 2:

V_INf_SWI_LOADMAXK_RIPPLE

Curve for Programming Output CC Current

where V_INis the input voltage, V_OUTis the output

voltage, f_SWis the switching frequency, I_LOADMAXis

the maximum load current, and K_RIPPLEis the ripple

Output Current vs. R_ISET

3500

factor. Typically, choose K_RIPPLE

correspond to the peak-to-peak ripple current being

30% of the maximum load current.

30% to

3000

2500

2000

1500

1000

500

With a selected inductor value the peak-to-peak

inductor current is estimated as:

(

)

V_OUT× V_INV_OUT

I_LPK_{_}

(3)

L×V_IN×f_SW

V_IN= 24V, V_OUT= 4V

23 29 32

The peak inductor current is estimated as:

(4)

I_LPK=I_LOADMAX

I_LPK_{_}

R_ISET(kꢀ)

Innovative Power^TM

- 6 -

www.active-semi.com

1...3 4 567 8 9...15

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与ACT4303YH-T相关器件

型号	品牌	获取价格	描述	数据表
ACT4402	AEROFLEX	获取价格	ACT4402 SINGLE TRANSCEIVER FOR MIL-STD-1553/1760
ACT4402-I	AEROFLEX	获取价格	ACT4402 SINGLE TRANSCEIVER FOR MIL-STD-1553/1760
ACT4404N	AEROFLEX	获取价格	Single Transceiver for MACAIR (A3818, A4905, A5232, A5690), MIL-STD-1553 & SAE-AS15531
ACT4404N_07	AEROFLEX	获取价格	Single Transceiver for MACAIR (A3818, A4905, A5232, A5690), MIL-STD-1553 & SAE-AS15531
ACT4404N-2	AEROFLEX	获取价格	Single Transceiver for MACAIR (A3818, A4905, A5232, A5690), MIL-STD-1553 & SAE-AS15531
ACT4407N	AEROFLEX	获取价格	Single Transceiver for MACAIR (A3818, A4905, A5232, A5690), MIL-STD-1553 & SAE-AS15531
ACT4407N-2	AEROFLEX	获取价格	Single Transceiver for MACAIR (A3818, A4905, A5232, A5690), MIL-STD-1553 & SAE-AS15531
ACT4418	AEROFLEX	获取价格	ACT4418 Molded Dual Variable Amplitude Transceivers for MACAIR A3818, A5690, A5232, A4905
ACT4418D	AEROFLEX	获取价格	ACT4418 Molded Dual Variable Amplitude Transceivers for MACAIR A3818, A5690, A5232, A4905
ACT4419	AEROFLEX	获取价格	Single Supply Variable Amplitude Transceivers for MIL-STD-1553

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