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參數(shù)資料
| 型號： | SP6120EY |
| 英文描述： | Low Voltage, AnyFETTM, Synchronous,Buck Controller Ideal for 2A to 10A, High Performance, DC-DC Power Converters |
| 中文描述： | 低電壓，AnyFETTM，同步，降壓控制器適合2A至10A條，高性能，DC - DC電源轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大?。?/td> | 308K |
| 代理商： | SP6120EY |
11
Date: 5/25/04
SP6120 Low Voltage, AnyFET
TM
, Synchronous, Buck Controller Copyright 2004 Sipex Corporation
0V
0V
0A
0V
0V
0A
Continuous
GH, GL
Discontinuous
GH, GL
TIME
Zero Crossing Detection
In some applications, it may be undesirable to have
negative conduction current in the inductor. This
situation happens when the ripple current in the
inductor is higher than the load current. Therefore,
the SP6120 provides an option for “discontinu-
ous” operation. If the Program Logic (see next
section) is set for discontinuous mode, then the
Driver Logic looks at the Zero Crossing Compara-
tor and the state of the lower gate driver. If the low
side MOSFET was “on” and V(ISP)-V(ISN) < 0
then the low side MOSFET is immediately turned
off and held off until the high side MOSFET is
turned “on”. When the high side MOSFET turns
“on” , the Driver Logic is reset. The following
figures show continuous and discontinuous opera-
tion for a converter with an NFET high
side
MOSFET.
Discontinuous vs. Continuous Mode
The discontinuous mode is used when better light
load efficiency is desired, for example in portable
applications. Additionally, for power supply se-
quencing in some applications the DC-DC con-
verter output is pre-charged to a voltage through a
switch at start-up, and discontinuous operation
would be required to prevent reverse inductor
current from discharging the pre-charge voltage.
The continuous mode is preferable for lower noise
and EMI applications since the discontinuous mode
can cause ringing of the switch node voltage when
it turns both switches off. Another example where
continuous mode could be required is one where
the inductor has an extra winding used for an over-
winding regulator and thus continuous conduction
is necessary to produce this second output voltage.
Program Logic
The Program pin (PROG) of the SP6120 adds a
new level of flexibility to the design of DC/DC
converters. A 10
μ
A current flows either into or out
of the Program pin depending on the initial poten-
tial presented to the pin. If no resistor is present, the
Program Logic simply looks at the potential on the
pin, sets the mode to “continuous” and programs
NFET or PFET high side drive accordingly. If the
68k
resistor is present,
Program Logic: continued
the voltage drop across the resistor signals the
SP6120 to put the Driver Logic in “discontinuous”
mode. With one pin and a 68k
resistor, the
SP6120 can be configured for a variety of operat-
ing modes:
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THEORY OF OPERATIONS: Continued
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|---|---|
| SP6120HV | High Voltage, Synchronous ,Buck Controller Ideal for 2A to 20A, High Performance, DC-DC Power Converters |
| SP6121 | Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6121CN | Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6121EB | Demo Board Manual |
| SP6132H | High Voltage, 300KHz Synchronous PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6120EY/TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Low Voltage, AnyFET Synchronous, Cntrllr 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(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6120EY-L | 功能描述:DC/DC 開關(guān)控制器 Low Voltage, AnyFET Synchronous, Cntrllr 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 |
| SP6120EY-L/TR | 功能描述:DC/DC 開關(guān)控制器 Low Voltage, AnyFET Synchronous, Cntrllr 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 |
| SP6120HV | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Voltage, Synchronous ,Buck Controller Ideal for 2A to 20A, High Performance, DC-DC Power Converters |
| SP6120HVCY | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Voltage, Synchronous ,Buck Controller Ideal for 2A to 20A, High Performance, DC-DC Power Converters |
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