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參數(shù)資料
| 型號： | SP6123 |
| 英文描述： | Low Voltage, Synchronous Step-Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| 中文描述： | 低，同步降壓電壓降壓PWM控制器，適合2A至10A條，占地面積小，DC - DC電源轉(zhuǎn)換器 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 154K |
| 代理商： | SP6123 |
15
Date: 5/25/04
SP6123 Low Voltage, Synchronous Step Down PWM Controller Copyright 2004 Sipex Corporation
Figure 5. A voltage divider connected to the V
FB
pin
programs the output voltage.
V
FB
V
OUT
SP6123
R1
R2
Overcurrent Protection
Over current protection on the SP6123 is imple-
mented through detection of an excess voltage
condition across the high side switch during
conduction. This is typically referred to as high
side R
DS(ON)
detection. By using the R
DS(ON)
of
Q1 to measure the output current, the current
limit circuit eliminates the sense resistor that
would otherwise be required and the corre-
sponding loss associated with it. This improves
the overall efficiency and reduces the number of
components in the power path benefiting size
and cost. R
DS(ON)
sensing is by default inaccu-
rate and is primarily meant to protect the power
supply during a fault condition. The overcurrent
trip point will vary from unit to unit as the
R
DS(ON)
of MOSFET varies. The SP6123 pro-
vides a built-in 200mV threshold between the
V
CC
and SWN pins.
The overcurrent threshold can be calculated as
200mV
I
MAX
=
R
DS(ON)
To ensure accurate current sensing, the V
CC
pin
should be connected directly to the drain of the
high side MOSFET. A RC filter on the V
CC
pin
is not recommended because it would artifi-
cially alter the current signal and reduce the
overcurrent threshold from the value given by
the equation.
Output Voltage Program
As shown in Figure 5, the voltage divider con-
necting to the V
FB
pin programs the output
voltage according to
V
OUT
= 0.8(1 + R
1
)
R
2
where 0.8V is the internal reference voltage.
Select R2 in the range of 10k to 100k, and R1 can
be calculated using
R
1
= R
2
(V
OUT
– 0.8)
0.8
APPLICATIONS INFORMATION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6123A | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Synchronous Step-Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6123ACN | 制造商:Exar Corporation 功能描述:Swithed-Mode Power Supply Controller, Voltage Mode Type, 8 Pin, Plastic, SOP |
| SP6123ACN/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage, Synchronous Step-Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6123ACN-L | 功能描述:電壓模式 PWM 控制器 Low Voltage, Micro 8 Synchronous, Cntrllr 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 |
| SP6123ACN-L/TR | 功能描述:電壓模式 PWM 控制器 Low Voltage, Micro 8 Synchronous, Cntrllr 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 |
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