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| 型号： | BD9533EKN-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 11/23页 |
| 文件大小： | 0K |
| 描述： | IC REG SW VAR SOFT START 20-HQFN |
| 标准包装： | 1 |
| 系列： | H³Reg™ |
| 应用： | 转换器，DDR SDRAM |
| 输入电压： | 4.5 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 2 V |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-HQFN |
| 包装： | 标准包装 |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD9533EKN-E2DKR |
● External Component Selection
1. Inductor (L) selection
The inductor value is a major influence on the output ripple
current. As formula (5) below indicates, the greater the inductor or
Δ I L
the switching frequency, the lower the ripple current.
V IN
Δ I L =
(V IN -V OUT ) × V OUT
Δ I L × V IN × f
[A] ??? (5)
The proper output ripple current setting is about 30% of maximum
I L
output current.
Δ I L × V IN × f
L
V OUT
Co
Δ I L =0.3 × I OUT max. [A] ??? (6)
(V IN -V OUT ) × V OUT
L= [H] ??? (7)
( Δ I L : output ripple current; f: switch 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 rated current value.
※ To minimize possible inductor damage and maximize efficiency, choose a inductor with a low (DCR, ACR) resistance.
2.Output Capacitor (C O ) Selection
V IN
When determining the proper output capacitor, be sure to factor in the equivalent
series resistance required to smooth out ripple volume and maintain a stable
output voltage range.
Output ripple voltage is determined as in formula (8) below.
L
Output capacitor
V OUT
ESR
ESL
Co
Δ V OUT = Δ I L × ESR+ESL ×Δ I L /T ON [V] ??? (8)
( Δ I L : Output ripple current; ESR: C O equivalent series resistance,
ESR:equivalent series inductance)
※ In selecting a capacitor, make sure the capacitor rating allows sufficient
margin relative to output voltage. Note that a lower ESR can minimize output
ripple voltage.
Please give due consideration to the conditions in formula (9) below for output capacity, bearing in mind that output rise time
must be established within the soft start time frame.
Co ≦
Tss × (Limit-I OUT )
V OUT
??? (9)
Tss: Soft start time
Limit: Over current detection
Note: Improper capacitor may cause startup malfunctions.
3. Input Capacitor (Cin) Selection
V IN
Cin
The input capacitor selected must have low enough ESR resistance to fully
support large ripple output, in order to prevent extreme over current. The formula
for ripple current IRMS is given in (10) below.
L
Co
V OUT
I RMS =I OUT ×
√ V OUT (V IN -V OUT )
V IN
[A] ??? (10)
Where V CC =2 × V OUT , I RMS =
I OUT
2
Input Capacitor
A low ESR capacitor is recommended to reduce ESR loss and maximize efficiency.
11/20
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