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參數(shù)資料
| 型號： | sp6650 |
| 英文描述： | High Efficiency 600mA Synchronous Buck Regulator(高效率,600mA同步補(bǔ)償穩(wěn)壓器) |
| 中文描述： | 600mA的高效率同步降壓穩(wěn)壓器（高效率，600mA的同步補(bǔ)償穩(wěn)壓器） |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 170K |
| 代理商： | SP6650 |
7
Rev. 2/4/02
SP6650 High Efficiency 600mA Synchronous Buck Regulator
Copyright 2002 Sipex Corporation
Under-Current Detection
The synchronous rectifier is comprised of the
inductor discharge switch, a voltage compara-
tor, and a latch. During the off-time, positive
inductor current flows into the PGND pin 9
through the low side NMOS switch to LX pin
10, through the inductor and the output capaci-
tor, and back to pin 9. The comparator monitors
the voltage drop across the discharge NMOS.
As the inductor current approaches zero, the
channel voltage sign goes from negative to
positive, causing the comparator to trigger the
latch and open the switch to prevent inductor
current reversal. This circuit along with the on-
time one shot puts the converter into PFM 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
SP6650 and surrounding circuitry from exces-
sive power dissipation due to fault conditions.
Shutdown/Enable Control
Pin 5 of the device is a logic level control pin that
shuts down the converter with a logic low, or
enables the converter with a logic high. When
the converter is shut down, the power switches
are opened and all circuit biasing is extinguished
leaving only junction leakage currents on sup-
ply pins 1 and 2. After pin 5 is brought high to
enable the converter, there is a turn on delay to
allow the regulator circuitry to re-establish it-
self. Power conversion begins with the assertion
of the internal reference ready signal which
occurs approximately 150
μ
s after the enable
signal is received.
Battery Low Indicator
The regulator bias voltage on pin 2 (V
IN
) is
divided down and compared to the internal
+1.25V reference voltage. When pin 2 voltage
drops below +3.00V, an open drain NMOS on
pin 3 (BLON) sinks current to ground. Tying a
resistor from pin 3 to V
IN
or V
OUT
creates a logic
level battery low indicator. A low bandwidth
comparator and 2.9% hysteresis filter the input
voltage ripple to prevent noisy transitions at the
threshold.
External Feedback Pin
The SP6650 comes with a factory preset output
voltage of +3.3V when pin 6 (FB) is grounded.
Otherwise, the output voltage can be externally
programmed within the range +1.25V 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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6650EB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6650EU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6650EU/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency 600mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery |
| SP6650EU-L | 功能描述:DC/DC 開關(guān)控制器 High Eff 600mA Synchronous 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 |
| SP6650EU-L/TR | 功能描述:DC/DC 開關(guān)控制器 High Eff 600mA Synchronous 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 |
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