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參數(shù)資料
| 型號： | SP6656 |
| 英文描述： | High Efficiency 400mA Synchronous Buck Regulator with Bit Programmable Output |
| 中文描述： | 高效率400mA同步降壓穩(wěn)壓器的可編程輸出位 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大小： | 185K |
| 代理商： | SP6656 |
11
Date: 7/9/04
SP6656 High Efficiency 400mA Synchronous Buck Regulator with Bit Programmable Output Copyright 2004 Sipex Corporation
For the typical SP6656 application circuit with
inductor size of 10
μ
H, and K
ON
of 2V*
μ
sec, the
SP6656 current ripple would be about 200mA, and
mode and improves light load efficiency when
the load current is less than half the inductor
ripple current defined by K
ON
/L.
Thermal Shutdown
The converter will open both power switches if
the die junction temperature rises above 140
°
C.
The die must cool down below 126
°
C before the
regulator is re-enabled. This feature protects the
SP6656 and surrounding circuitry from exces-
sive power dissipation due to fault conditions.
Shutdown/Enable Control
The EN pins of the device are logic level control
pins that shut down the converter when a logic
is low, or enables the converter when a logic is
high. When the converter is shut down, the
power switches are opened and all circuit bias-
ing is extinguished leaving only junction leak-
age currents on supply pins 1 and 2. After pins
4 or 5 are brought high to enable the converter,
there is a turn on delay to allow the regulator
circuitry to re-establish itself. Power conversion
begins with the assertion of the internal refer-
ence ready signal which occurs approximately
150
μ
s after the enable signal is received.
Output Voltage Selection
The OVSI (Output Voltage Selection Input) pin
is internally driving a NMOS Gate which Drain
(OVSO pin) is used to short circuit R
S
and then
achieve a a higher output voltage ( see table 1 for
calculation, page 3)
External Feedback Pin
The FB pin 6 is compared to an internal refer-
ence voltage of 0.8V to regulate the SP6656
output. The output voltage can be externally
programmed within the range +1.0V to +5.0V
by tying a resistor from FB to ground and FB to
V
OUT
(pin7). See the applications section for
resistor selection information.
Inductor Selection
The SP6656 uses a specially adapted minimum
on-time control of regulation utilizing a preci-
sion comparator and bandgap reference. This
adaptive minimum on-time control has the ad-
vantage of setting a constant current ripple for a
given inductor size. From the operations section
it has been shown:
Inductor Current Ripple, I
LR
≈
K
ON
THEORY OF OPERATION
APPLICATION INFORMATION
would be fairly constant for different input and
output voltages, simplifying the selection of com-
ponents for the SP6656 power circuit. Other
inductor values could be selected, as shown in
Table 2 Components Selection. Using a larger
value than 10
μ
H in an attempt to reduce output
voltage ripple would reduce inductor current ripple
and may not produce as stable an output ripple.
For larger inductors with the SP6656, which has
a peak inductor current of 0.625A, most 15
μ
H
or 22
μ
H inductors would have to be larger
physical sizes, limiting their use in small por-
table applications. Smaller values like 10
μ
H
would more easily meet the 0.625A limit and
come in small case sizes, and the increased
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SP6656_06 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency 400mA Synchronous Buck Regulator with Dynamically Adjustable Voltage Output |
| SP6656EB | 功能描述:電源管理IC開發(fā)工具 Hi-Efficiency 400mA Sync Buck Regulator 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 |
| SP6656ER | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency 400mA Synchronous Buck Regulator with Bit Programmable Output |
| SP6656ER/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency 400mA Synchronous Buck Regulator with Bit Programmable Output |
| SP6656ER3 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency 400mA Synchronous Buck Regulator with Dynamically Adjustable Voltage Output |
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