Datasheet > ELM9327BB-S

ELM9327BB-S

更新时间： 2024-02-08 20:11:50

品牌	Logo	应用领域
ELM-TECH		转换器开关
页数	文件大小	规格书
8页	94K
描述
CMOS High efficiency PFM step-up DC/DC converter

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技术参数
数据手册

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ELM9327BB-S 技术参数

生命周期：	Contact Manufacturer	包装说明：	,
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.75
Is Samacsys：	N	模拟集成电路 - 其他类型：	SWITCHING REGULATOR
Base Number Matches：	1

ELM9327BB-S 数据手册

CMOS High efficiency PFM step-up DC/DC converter

ELM93xxxB

3) Capacitor

When choosing capacitor, please select that which is generally used for smoothing power supply circuit,

with comparatively large capacity and whose rated voltage is at least three times larger than rated output

voltage of used ELM93 series.

For ELM93 series, ELM recommends Aluminum electrolytic or Tantalum capacitor.

Under different conditions, such as different input voltage, load current, etc. larger output voltage ripple

may happen and thus result in intermittent switching. To solve this, using capacitors with larger capacity

can prevent output voltage ripple from becoming larger.

Inserting resistor, as shown in the following circuit, may also be effective.

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■Design of DC/DC converter

In the DC/DC converter which consists of ELM93 series and above-mentioned external parts, the output is

acquired as follows:

1) Output current of DC/DC converter

The current from the output terminal (Vout) of the circuit is:

9Vin²

Iout = K

Duty=75%

32 • L • Fosc • (Vout-Vin)

K: the efﬁciency of whole circuit (≈75% to ≈85%)

2) Remedies for noise

This DC/DC converter may cause electromagnetic noise due to switching of coil under large current. Solu-

tion is necessary especially when the IC is used in wireless devices.

To reduce noise, this IC is designed in consideration of the coil switching characteristics. The following

methods are also effective to reduce noise.

• Use shield-type, or magnetic shield coil.

• Locate coil and diode to the LX terminal of IC as close as possible.

• Select ground wire as thick and short as possible.

• Connect ground wire of circuit to one point.

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