- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄30770 > LTC3536IMSE#PBF (LINEAR TECHNOLOGY CORP) 4 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO12 PDF資料下載
參數(shù)資料
| 型號： | LTC3536IMSE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO12 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-12 |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 1088K |
| 代理商： | LTC3536IMSE#PBF |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁當前第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
LTC3536
18
3536f
APPLICATIONS INFORMATION
The transfer function of the compensated Type III error
amplifier from the input of the resistor divider to the output
of the error amplifier, VC, is:
VC(S)
VOUT(S)
= GEA
1
+
s
2
πfZERO1
1
+
s
2
πfZERO2
s 1
+
s
2
πfPOLE1
1
+
s
2
πfPOLE2
The error amplifier gain is given by the following equation.
The simpler approximate value is sufficiently accurate in
most cases since CFB is typically much larger in value
than CPOLE.
GEA =
1
RTOP CFB +CPOLE
(
)
≈
1
RTOPCFB
ThepoleandzerofrequenciesoftheTypeIIIcompensation
network can be calculated from the following equations
where all frequencies are in Hz, resistances are in ohms,
and capacitances are in farads.
fZERO1=
1
2
πRFBCFB
fZERO2 =
1
2
π RTOP +RFF
(
)CFF
≈
1
2
πRTOPCFF
fPOLE2 =
CFB +CPOLE
2
πCFBCPOLERFB
≈
1
2
πCPOLERFB
fPOLE3 =
1
2
πCFFRFF
Figure 9. Internal Loop Filter
Inmostapplicationsthecompensationnetworkisdesigned
so that the loop crossover frequency is above the resonant
frequency of the power stage, but sufficiently below the
boostmoderight-halfplanezerotominimizetheadditional
phaseloss.Oncethecrossoverfrequencyisdecidedupon,
the phase boost provided by the compensation network
is centered at that point in order to maximize the phase
margin. A larger separation in frequency between the
zeros and higher order poles will provide a higher peak
phase boost but may also increase the gain of the error
amplifier which can push out the loop crossover to a
higher frequency.
The Q of the power stage can have a significant influence
on the design of the compensation network because it
determineshowrapidlythe180°ofphaselossinthepower
stage occurs. For very low values of series resistance, RS,
the Q will be higher and the phase loss will occur sharply.
In such cases, the phase of the power stage will fall rapidly
to –180° above the resonant frequency and the total phase
margin must be provided by the compensation network.
However, with higher losses in the power stage (larger RS)
the Q factor will be lower and the phase loss will occur
more gradually. As a result, the power stage phase will
not be as close to –180° at the crossover frequency and
less phase boost is required of the compensation network.
The LTC3536 error amplifier is designed to have a fixed
maximum bandwidth in order to provide rejection of
switching noise to prevent it from interfering with the
control loop. From a frequency domain perspective, this
can be viewed as an additional single pole as illustrated
in Figure9. The nominal frequency of this pole is 400kHz.
For typical loop crossover frequencies below about 40kHz
the phase contributed by this additional pole is usually
Figure 8. Type III Compensation Bode Plot
GAIN
PHASE
fZERO1
fPOLE2fPOLE3
f
fZERO2
90°
–90°
0°
–20dB/DEC
3536 F08
+
–
INTERNAL
VC
CFILT
3536 F09
RFILT
LTC3536
0.6V
FB
VC
相關PDF資料 |
PDF描述 |
|---|---|
| LTC3536EDD#PBF | 4 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO10 |
| LTC3546EFE#PBF | DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO28 |
| LTC3546EUFD#PBF | DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PQCC28 |
| LTC3546IUFD | DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PQCC28 |
| LTC3546EUFD | DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PQCC28 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3537 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
| LTC3537EUD#PBF | 功能描述:IC REG DL BST/LINEAR SYNC 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LTC3537EUD#TRPBF | 功能描述:IC REG DL BST/LINEAR SYNC 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LTC3537EUD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
| LTC3537EUD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
發(fā)布緊急采購，3分鐘左右您將得到回復。