参数资料
| 型号： | BD95513MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 32VQFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 5 V |
| 输入电压： | 4.5 V ~ 28 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 200kHz ~ 600kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | VQFN032V5050 |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD95513MUV-E2DKR |
BD95513MUV
Technical Note
● External Component Selection
1. Inductor (L) Selection
The inductor ’s value directly influences the output ripple current.
As formula (4) indicates below, the greater the inductance or switching
frequency, the lower the ripple current:
Δ I L
V IN
Δ I L =
(V IN -V OUT ) × V OUT
L × V IN × f
[A] ??? (4)
The proper output ripple current setting is about 30% of maximum output
I L
V OUT
current.
Δ I L =0.3 × I OUT max. [A] ??? (5)
L
Co
L=
(V IN -V OUT ) × V OUT
Δ I L × V IN × f
[H] ??? (6)
( Δ I L : output ripple current, f: switching frequency)
Output ripple current
* Passing a current larger than the inductor ’s rated current will cause magnetic saturation in the inductor and decrease
system efficiency. In selecting the inductor, be sure to allow enough margin to assure that peak current does not
exceed the inductor ’s rated current value.
* To minimize possible inductor damage and maximize efficiency, choose an inductor with a low DCR and ACR resistance.
2. Output Capacitor Selection (C O )
V IN
V OUT
When determining the proper output capacitor, be sure to factor in the
equivalent series resistance (ESR) and equivalent series inductance (ESL)
required to set the output ripple voltage at 20 mV or more.
When selecting the limit of the inductor, be sure to allow enough margin for
L
ESL ESR
the output voltage. Output ripple voltage is determined by formula (7)
below:
Δ V OUT = Δ I L × ESR+ESL ×Δ I L / T ON ??? (7)
Co
Output Capacitor
( Δ I L : Ouput ripple current, ESR: equivalent series resistance,
ESL: equivalent series inductance)
Give special consideration to the conditions of formula (7) for output capacitance. Also, keep in mind that the output rise
time must be established within the soft start timeframe.
Co ≦
tss × (I limit -I OUT )
V OUT
??? (8)
tss: Soft start timeframe (see p. 10, equation (2))
I limit : Maximum output current
Choosing a capacitance that is too large can cause startup malfunctions, or in some cases, may engage the short circuit
protection.
3. Input Capacitor Selection (C IN )
V IN
C IN
In order to prevent extreme over-current conditions, the input capacitor
must have a low enough ESR to fully support a large ripple in the output.
The formula for RMS ripple current (I RMS ) is given by equation (9) below:
L
Co
V OUT
I RMS =I OUT ×
V IN (V IN -V OUT )
V IN
[A] ??? (9)
When V IN =2 × V OUT , I RMS =
I OUT
2
Input Capacitor
A low-ESR capacitor is recommended to reduce ESR loss and maximize efficiency.
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
12/17
2010.10- Rev.A
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