- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄297422 > SP6138ER1-L (EXAR CORP) 2 A SWITCHING CONTROLLER, 2800 kHz SWITCHING FREQ-MAX, QCC16 PDF資料下載
參數(shù)資料
| 型號(hào)： | SP6138ER1-L |
| 廠商： | EXAR CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 2800 kHz SWITCHING FREQ-MAX, QCC16 |
| 封裝： | 3 X 3 MM, LEAD FREE, MO-220VEED-4, QFN-16 |
| 文件頁(yè)數(shù)： | 16/17頁(yè) |
| 文件大?。?/td> | 958K |
| 代理商： | SP6138ER1-L |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)當(dāng)前第16頁(yè)第17頁(yè)
8
Oct 24-06 Rev J
SP638 Synchronous Buck Controller
2006 Sipex Corporation
APPLICATION INFORMATION
Increasing the Current Limit
If it is desired to set Imax >
{60mV / DCR}
(in this case larger than 4.6A), then a resis-
tor RS3 should be added as shown in figure
2. RS3 forms a resistor divider and reduces
the voltage seen by the comparator.
Since: 60mV
( Imax DCR )
RS3 =
{RS + RS2 + RS3}
Solving for RS3 we get:
RS3 = [60mV (RS + RS2)]
.........(2a)
[(Imax DCR) – 60mV]
As an example: if desired Imax is 7A, then
RS3 = 63.4K.
Figure 2- Over-current detection circuit
for Imax > 60mV / DCR
Decreasing the Current Limit
If it is required to set Imax <
{60mV / DCR}, a
resistor is added as shown in figure 3. RS3
increases the net voltage detected by the
current-sense comparator. Voltage at the
positive and negative terminal of compara-
tor is given by:
VSP = Vout + (Imax DCR)
VSN = Vout x {RS3 / (RS2 +RS3)}
Since the comparator is triggered at 60mV:
VSP-VSN = 60 mV
Combining the above equations and solv-
ing for RS3:
RS3 =
RS2
[Vout- 60mV + (IMAXDCR)].........(2b)
60mV - (IMAX DCR)
Asanexample: forImaxof2AandVoutof3.3V,
calculated RS3 is .5MΩ (232KΩ standard).
Figure 3- Over-current detection circuit
for Imax < {60mV / DCR}
Power MOSFET Selection
There are four main criterion in selecting
Power MOSFETs for buck conversion:
●
Voltage rating BVdss
●
On resistance Rds(on)
●
Gate-to-drain charge Qgd
●
Package type
In order to better illustrate the MOSFET se-
lection process, the following buck converter
design example will be used: Vin = 2V, Vout
= 3.3V, Iout = 0A, f = 2000KHz, DCR =
4.5m (inductor DC resistance), efficiency
= 94% and Ta = 40C.
Select the voltage rating based on maximum
input voltage of the converter. A commonly
used practice is to specify BVdss at least
twice the maximum converter input voltage.
This is done to safeguard against switching
transientsthatmaybreakdowntheMOSFET.
For converters with Vin of less than 0V, a
RS3
63.4K
CSP
6.8nF
SWN
ISP
ISN
SP613X
CS
0.uF
RS2
5.K
RS
5.K
L = 2.7uH, DCR = 4.mOhm
Vout
CSP
6.8nF
ISN
SP613X
SWN
ISP
CS
0.uF
RS2
5.K
RS
5.K
Vout
L = 2.7uH, DCR = 4.mOhm
RS3
.5MOhm
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6334EK1-LRCD | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| SP6334EK1-LSHD | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| SP6334EK1-LSID | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| SP6334EK1-LYCD | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| SP6334EK1-LYIATR | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6138ER1-L/TR | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Synchronous Controller 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(kāi)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 |
| SP6139 | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Wide Input, 1.3MHz Synchronous PWM Controller |
| SP6139EU | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Wide Input, 1.3MHz Synchronous PWM Controller |
| SP6139EU/TR | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Wide Input, 1.3MHz Synchronous PWM Controller |
| SP6139EU-L | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Wide Input, 1.3MHz 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(kāi)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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。