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參數(shù)資料
| 型號： | SP6659EK1-1.5/TR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 204K |
| 代理商： | SP6659EK1-1.5/TR |
7
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
Copyright 2005 Sipex Corporation
Figure 21. SP6659 Idle Mode Operation
APPLICATION INFORMATION
A resistive divider based on the following
equation determines the output voltage:
VOUT = 0.6 (1+
)
The external resistive divider is connected
to the output as shown in Figure 20 .
SP6659
GND
R1
R2
VFB
VOUT
Figure 20: Setting the SP6659 Output Voltage.
R1
R2
The SP6659 is a monolithic switching mode
Step-Down DC-DC converter. It utilizes in-
ternal MOSFETs to achieve high efficiency
and can generate very low output voltage
by using its internal reference at 0.6V. It
operates at a fixed switching frequency,
and uses slope compensated, current-mode
architecture. This Step-Down DC-DC con-
verter supplies 600mA of output current at
VIN = 3V. The entire input voltage range is
from 2.5V to 5.5V.
__________________ CURRENT MODE
PWM CONTROL
Slope compensated current mode PWM
control provides stable switching and cycle-
by-cycle current limit for excellent load and
line responses and protection of the internal
main switch (P-Channel MOSFET) as well
as the synchronous rectifier (N-Channel
MOSFET). During normal operation, the in-
ternal P-Channel MOSFET is turned on for
a certain time to ramp the inductor current at
each rising edge of the internal oscillator,
and switched off when the peak inductor
current is above the error voltage.
The
current comparator, ICOMP, limits the peak
inductor current. When the main switch is
off, the synchronous rectifier will be turned
THEORY OF OPERATION
on immediately and stay on until either the
inductor current starts to reverse, as indi-
cated by the current reversal comparator,
IZERO, or the beginning of the next clock
cycle.
The OVDET comparator controls
output transient overshoots by turning the
main switch off and keeping it off until the
fault is no longer present.
_______________________ IDLE MODE
OPERATION
At very light loads, the SP6659 automati-
cally enters Idle Mode (Figure 21).
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP6659EK118 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1.5MHz, 600mA Synchronous Buck Regulator |
| SP6659EK118/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1.5MHz, 600mA Synchronous Buck Regulator |
| SP6659EK1-L | 制造商:Exar Corporation 功能描述:REG BUCK 1.5MHZ 0.6A TSOT23-5 |
| SP6659EK1-L/TR | 功能描述:DC/DC 開關控制器 1.5MHz, 600mA Synchronous RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| SP6659EK1-L-1-5/TR | 功能描述:開關變換器、穩(wěn)壓器與控制器 1.5MHz, 600mA Synchronous RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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