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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ACT4303YH-T 数据手册

ACT4303

Active- Semi

Rev 0, 05-Dec-11

APPLICATIONS INFORMATION CONT’D

The selected inductor should not saturate at I_LPK.

The maximum output current is calculated as:

Output Capacitor

The output capacitor also needs to have low ESR to

keep low output voltage ripple. The output ripple

voltage is:

I_OUTMAX= I_LIM

I_LPK_{_}

(5)

V_IN

V_RIPPLE= I_OUTMAXK_RIPPLER_ESR

(6)

28 × f_SW²LC_OUT

L_LIMis the internal current limit, which is typically

3.2A, as shown in Electrical Characteristics Table.

Where I_OUTMAXis the maximum output current,

K_RIPPLEis the ripple factor, R_ESRis the ESR of the

output capacitor, f_SWis the switching frequency, L is

the inductor value, and C_OUTis the output

capacitance. In the case of ceramic output

capacitors, R_ESRis very small and does not

External High Voltage Bias Diode

It is recommended that an external High Voltage

Bias diode be added when the system has a 5V

fixed input or the power supply generates a 5V

output. This helps improve the efficiency of the

regulator. The High Voltage Bias diode can be a

low cost one such as IN4148 or BAT54.

contribute to the ripple. Therefore,

lower

capacitance value can be used for ceramic type. In

the case of tantalum or electrolytic capacitors, the

ripple is dominated by R_ESRmultiplied by the ripple

current. In that case, the output capacitor is chosen

to have sufficiently low ESR.

Figure 4:

External High Voltage Bias Diode

For ceramic output capacitor, typically choose a

capacitance of about 22µF. For tantalum or

electrolytic capacitors, choose a capacitor with less

than 50mꢀ ESR.

Rectifier Diode

Use a Schottky diode as the rectifier to conduct

current when the High-Side Power Switch is off.

The Schottky diode must have current rating higher

than the maximum output current and a reverse

voltage rating higher than the maximum input

voltage.

This diode is also recommended for high duty cycle

operation and high output voltage applications.

Input Capacitor

The input capacitor needs to be carefully selected

to maintain sufficiently low ripple at the supply input

of the converter. A low ESR capacitor is highly

recommended. Since large current flows in and out

of this capacitor during switching, its ESR also

affects efficiency.

The input capacitance needs to be higher than

10µF. The best choice is the ceramic type,

however, low ESR tantalum or electrolytic types

may also be used provided that the RMS ripple

current rating is higher than 50% of the output

current. The input capacitor should be placed close

to the IN and G pins of the IC, with the shortest

traces possible. In the case of tantalum or

electrolytic types, they can be further away if a

small parallel 0.1µF ceramic capacitor is placed

right next to the IC.

Innovative Power^TM

- 7 -

www.active-semi.com

1...4 5 678 9 10...15

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