參數(shù)資料
型號： S-8353H20MC-IWFT2G
元件分類： 穩(wěn)壓器
英文描述： 0.3 A SWITCHING REGULATOR, 287.5 kHz SWITCHING FREQ-MAX, PDSO5
封裝： LEAD FREE, SOT-23, 5 PIN
文件頁數(shù)： 13/49頁
文件大?。?/td> 479K
代理商： S-8353H20MC-IWFT2G
STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
S-8353/8354 Series
Rev.3.0_00
Seiko Instruments Inc.
20
External Parts Selection
The relationship between the major characteristics of the step-up circuit and the characteristic parameters of the external
parts is shown in Figure 12.
For higher efficiency ?
For larger output current ?
At PFM control
At PWM control
For smaller ripple voltage ?
Smaller inductance
Larger inductance
Smaller direct current resistance of inductor
Larger output capacitance
Figure 12
Relationship between Major Characteristics of Step-up Circuit and External Parts
1.
Inductor
The inductance value (L value) has a strong influence on the maximum output current (IOUT) and efficiency (
η).
The peak current (IPK) increases by decreasing L value and the stability of the circuit improves and IOUT increases. If L
value is decreased, the efficiency falls causing a decline in the current drive capacity for the switching transistor, and
IOUT decreases.
The loss of IPK by the switching transistor decreases by increasing L and the efficiency becomes maximum at a
certain L value. Further increasing L value decreases the efficiency due to the loss of the direct current resistance of
the coil.
IOUT also decreases.
A higher oscillation frequency allows selection of a lower L value, making the coil smaller.
The recommended inductances are a 47
μH to 220 μH for A, C, and D types, a 10 μH to 47 μH for H and J types.
Be careful of the allowable inductor current when choosing an inductor.
Exceeding the allowable current of the
inductor causes magnetic saturation, much lower efficiency and destruction of the IC chip due to a large current.
Choose an inductor so that IPK does not exceed the allowable current. IPK in discontinuous mode is calculated by the
following equation:
L
f
)
V
(
I
2
I
OSC
IN
D
OUT
PK
+
=
(A)
(17)
fosc = oscillation frequency, VD
0.4 V.
2.
Diode
Use an external diode that meets the following requirements :
Low forward voltage :
VF
< 0.3 V
High switching speed : 50 ns max.
Reverse voltage :
VOUT
+ VF or more
Current rate :
IPK or more
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相關代理商/技術參數(shù)
參數(shù)描述
S-8353H20MC-IWFT2U 功能描述:IC REG BOOST 2V 0.3A SOT23-5 制造商:ablic u.s.a. inc. 系列:* 包裝:剪切帶（CT） 零件狀態(tài):在售 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商器件封裝:SOT-23-5 標準包裝:1
S-8353H26MC-IWLT2G 功能描述:DC/DC 開關控制器 Step-Up SWR PWM 18.7uA Iq RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
S-8353H28MC-IWNT2G 功能描述:DC/DC 開關控制器 STEP-UP SWR PWM 18.7UA IQ RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
S-8353H30MA-IWPT2G 功能描述:DC/DC 開關控制器 Step-Up SWR PWM 18.7uA Iq RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
S-8353H30MC-IWPT2G 功能描述:直流/直流開關調節(jié)器 Step-Up SWR PWM 18.7uA Iq RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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