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參數(shù)資料
| 型號： | SP6126EK1-L |
| 英文描述： | High-Voltage, Step Down Controller in TSOT6 |
| 中文描述： | 高電壓，降壓控制器在TSOT6步 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 477K |
| 代理商： | SP6126EK1-L |
Mar 29-07 RevD SP6126: TSOT-6 PFET Buck Controller
2007 Sipex Corporation
7
Power MOSFET Selection
Select the Power MOSFET for Voltage rating
BV
DSS
, On resistance R
DS(ON)
, and thermal
resistance Rthja. BV
DSS
should be about twice
as high as V
IN
in order to guard against
switching transients. Recommended MOSFET
voltage rating for V
IN
of 5V, 12V and 24V is
12V, 30V and 40V respectively. R
DS(ON)
has to
be selected such that when operating at peak
current
and
junction
Overcurrent threshold of the SP6126 is not
exceeded. Allowing 50% for temperature
coefficient of R
DS(ON)
and 15% for inductor
current ripple, the following expression can be
used:
≤
ON
RDS
5
Within this constraint, selecting MOSFETs with
lower R
DS(ON)
will reduce conduction losses at
the expense of increased switching losses. As
a rule of thumb select the highest R
DS(ON)
MOSFET that meets the above criteria.
Switching losses can be assumed to roughly
equal the conduction losses. A simplified
expression for conduction losses is given by:
temperature
the
×
×
Iout
mV
15
.
300
)
(
×
×
=
Vin
Vout
ON
(
RDS
Iout
Pcond
)
MOSFET’s
estimated from:
T
Schottky Rectifier selection
Select the Schottky for Voltage rating V
R
,
Forward voltage V
f
, and thermal resistance
Rthja. Voltage rating should be selected using
the same guidelines outlined for MOSFET
voltage selection. For a low duty cycle
application such as the circuit shown on first
page, the Schottky is conducting most of the
time and its conduction losses are the largest
component
of
losses
Conduction losses can be estimated from:
junction
temperature
can
be
(
)
Tambient
+
Rthja
Pc
×
×
=
2
in
the
converter.
1
×
×
=
Vin
Vout
Iout
Vf
Pc
where:
Vf is diode forward voltage at
I
OUT
Schottky’s AC losses due to its switching
capacitance are negligible.
Inductor Selection
Select the Inductor for inductance L and
saturation current
I
SAT
. Select an inductor with
I
SAT
higher than the programmed overcurrent.
Calculate inductance from:
×
=
Vin
(
)
×
×
Irip
f
Vout
Vout
Vin
L
1
1
where:
V
IN
is converter input voltage
V
OUT
is converter output voltage
f
is switching frequency
I
RIP
is inductor peak-to-peak current ripple
(nominally set to 30% of I
OUT
)
Keep in mind that a higher
I
RIP
results in a
smaller inductor which has the advantages of
small size, low DC equivalent resistance DCR,
high saturation current
I
SAT
and allows the use
of a lower output capacitance to meet a given
step load transient. A higher
I
RIP
, however,
increases the output voltage ripple and
increases the current at which converter enters
Discontinuous Conduction Mode. The output
current at which converter enters DCM is of
I
RIP
. Note that a negative current step load that
drives the converter into DCM will result in a
large output voltage transient. Therefore the
lowest current for a step load should be larger
than of
I
RIP
.
Output Capacitor Selection
Select the output capacitor for voltage rating,
capacitance and Equivalent Series Resistance
(ESR). Nominally the voltage rating is selected
to be twice as large as the output voltage.
Select
the
capacitance
specification
for
overshoot/undershoot caused by current step
load.
A
steady-state
corresponds to inductor stored energy of L I
OUT
2
.
to
satisfy
the
output
voltage
output
current
I
OUT
GENERAL OVERVIEW
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6127_07 | Evaluation Board Manual |
| SP6127EB | Evaluation Board Manual |
| SP6127EK1 | Evaluation Board Manual |
| SP6127EK1L | High-Voltage, Step-Down Controller in TSOT6 |
| SP6127 | High-Voltage, Step-Down Controller in TSOT6 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6126EK1L/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6126EK1-L/TR | 功能描述:電壓模式 PWM 控制器 High-Voltage Step Down Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6127 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6127_07 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6127EB | 功能描述:電源管理IC開發(fā)工具 Eval Board for SP6127 Series RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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