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參數(shù)資料
| 型號(hào)： | LTC3536EDD#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, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 1088K |
| 代理商： | LTC3536EDD#PBF |
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LTC3536
17
3536f
Figure 5. Buck-Boost Converter Bode Plot
Figure 6. Error Amplifier with Type I Compensation
Figure 7. Error Amplifier with Type III Compensation
Finally, the magnitude of the quality factor of the power
stage in buck-boost mode operation is given by the fol-
lowing expression:
Q
=
LCOUT RLOAD +RC
(
) RS +RLOAD ε2
L
+COUTRLOADRC ε2 +RSCOUT RLOAD +RC
(
)
Compensation of the Voltage Loop
The small-signal models of the LTC3536 reveal that the
transfer function from the error amplifier output, VC, to
the output voltage is characterized by a set of resonant
poles and a possible zero generated by the ESR of the
output capacitor as shown in the Bode plot of Figure 5.
In boost mode operation, there is an additional right-half
plane zero that produces phase lag and increasing gain at
higher frequencies. Typically, the compensation network
is designed to ensure that the loop crossover frequency
is low enough that the phase loss from the right-half
plane zero is minimized. The low frequency gain in buck
mode is a constant, but varies with both VIN and VOUT in
boost mode.
low enough that the resultant crossover frequency of the
control loop is well below the resonant frequency.
In most applications, the low bandwidth of the Type I com-
pensatedloopwillnotprovidesufficienttransientresponse
performance. To obtain a wider bandwidth feedback loop,
optimize the transient response, and minimize the size of
the output capacitor, a Type III compensation network as
shown in Figure 7 is required.
APPLICATIONS INFORMATION
–40dB/DEC
–20dB/DEC
BUCK MODE
BOOST MODE
fRHPZ
3536 F05
fO
f
PHASE
–270°
–180°
–90°
0°
GAIN
For charging or other applications that do not require an
optimized output voltage transient response, a simple
TypeI compensation network as shown in Figure 6 can
be used to stabilize the voltage loop. To ensure sufficient
phase margin, the gain of the error amplifier must be
+
–
0.6V
FB
GND
3536 F06
LTC3536
C1
VOUT
RTOP
RBOT
VC
+
–
0.6V
FB
GND
3536 F07
LTC3536
RFB
CFB
CPOLE
CFF
RFF
VOUT
RTOP
RBOT
VC
A Bode plot of the typical Type III compensation network
is shown in Figure 8. The Type III compensation network
provides a pole near the origin which produces a very high
loop gain at DC to minimize any steady-state error in the
regulation voltage. Two zeros located at fZERO1 and fZERO2
provide sufficient phase boost to allow the loop crossover
frequency to be set above the resonant frequency, fO, of
the power stage. The Type III compensation network also
introduces a second and third pole. The second pole, at
frequency fPOLE2, reduces the error amplifier gain to a
zero slope to prevent the loop crossover from extending
too high in frequency. The third pole at frequency fPOLE3
provides attenuation of high frequency switching noise.
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| LTC3536EMSE#PBF | 功能描述:IC REG BUCK BST SYNC ADJ 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3536EMSE#TRPBF | 功能描述:IC REG BUCK BST SYNC ADJ 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC3536IDD#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 12DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
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