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參數(shù)資料
| 型號： | SP6125EK1L |
| 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)： | 6/12頁 |
| 文件大?。?/td> | 536K |
| 代理商： | SP6125EK1L |
Mar22-07 RevC SP6125: TSOT-6 PFET Buck Controller
2007 Sipex Corporation
6
Overcurrent protection
Figure 3- Overcurrent protection circuit
The overcurrent protection circuit functions by
monitoring the voltage across the high-side FET
Q1. When this voltage exceeds 0.3V, the
overcurrent
comparator
controller enters hiccup mode. For example if
Q1 has Rds(on)=0.1
, then the overcurrent will
trigger at I = 0.3V/0.1
=3A. To program a lower
overcurrent use a resistor Rs as shown in figure
1. Calculate Rs from:
(
uA
30
The overcurrent circuit triggers at peak current
through Q1 which is usually about 15% higher
than average output current. Hence the
multiplier 1.15 is used in (5).
Example: A switching MOSFET used with
SP6125 has Rds(on) of 0.1
. Program the over-
current circuit so that maximum output is 2A.
(
Rs
30
Rs = 2333
Using the above equation there is good
agreement between calculated and test results
for Rs in the range of 0.5k
to 3k
. For Rs
larger than 3k
test results are lower than those
predicted by (5), due to circuit parasitics.
Therefore maximum value of Rs should be
limited to 3k
.
triggers
and
the
)
on
Rds
Iout
Rs
)
(
15
.
3
×
×
=
……… (5)
)
uA
Ohm
A
1
×
2
15
.
3
×
=
Using the ON/OFF Function
The Feedback pin serves a dual role of
ON/OFF control. The MOSFET driver is
disabled when a voltage greater than 1V is
applied at the FB pin. Maximum voltage rating
of this pin is 5.5V. The controlling signal should
be applied through a small signal diode as
shown on page 1.
Please note that an optional
10k
bleeding resistor across the output helps
keep the output capacitor discharged under no
load condition.
Programming the Output Voltage
To program the output voltage, calculate R2
using the following equation:
=
1
1
2
Vref
Vout
R
R
Where:
Vref=0.6 is the reference voltage of the SP6125
R1=200k
is a fixed-value resistor that, in
addition to being a voltage divider, it is part of
the compensation network. In order to simplify
compensation calculations, R1 is fixed at
200k
.
Soft Start
Soft Start is preset internally to 5ms (nominal).
Internal Soft Start eliminates the need for the
external capacitor CSS that is commonly used
to program this function.
MOSFET Gate Drive
P-channel drive is derived through an internal
regulator that generates V
IN
-5V. This pin (VDR)
has to be connected to V
IN
with a 0.1uF
decoupling capacitor. The gate drive circuit
swings between V
IN
and V
IN
-5 and employs
powerful drivers for efficient switching of the P-
channel MOSFET.
Ds
Q1
Rs
SP6125
Gate
LX
30uA
+
-
Vin - 0.3V
Vin
Over-Current Comparator
General Overview
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6126_1 | Evaluation Board Manual |
| SP6126EB | Evaluation Board Manual |
| SP6126EK1 | Evaluation Board Manual |
| SP6126 | High-Voltage, Step Down Controller in TSOT6 |
| SP6126_07 | High-Voltage, Step Down Controller in TSOT6 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6125EK1-L | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| SP6125EK1-L/TR | 功能描述:電源管理IC開發(fā)工具 High-Voltage Step Down Controller 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 |
| SP6125EK1L/TR1 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6126 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6126_07 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
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