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參數資料
| 型號： | 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： | 11/28頁 |
| 文件大小： | 1088K |
| 代理商： | LTC3536EDD#PBF |
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LTC3536
19
3536f
Figure 10. Converter Bode Plot, VIN = 1.8V, ILOAD = 300mA
APPLICATIONS INFORMATION
negligible (for 40kHz is around –5.7°). However, for loops
with higher crossover frequencies this additional phase
lag should be taken into account when designing the
compensation network.
Loop Compensation Example
This section provides an example illustrating the design of
a compensation network for a typical LTC3536 application
circuit. In this example a 3.3V regulated output voltage is
generated with the ability to supply 300mA load from an
input power source ranging from 1.8V to 5.5V. To optimize
efficiency 1MHz switching frequency has been chosen. In
this application the maximum inductor current ripple will
occur at the highest input voltage. An inductor value of
4.7H has been chosen to limit the worst-case inductor
current ripple. A low ESR output capacitor with a value
of 22F is specified to yield a worst-case output voltage
rippleofapproximately10mV(occurringattheworst-case
step-upratioandmaximumloadcurrent).Insummary,the
key power stage specifications for this LTC3536 example
application are given below:
f = 1MHz
VIN = 1.8V to 5.5V
VOUT = 3.3V at 300mA
COUT = 22F,
RC = 10mΩ
L = 4.7H,
RL = 60mΩ
With the power stage parameters specified, the compen-
sation network can be designed. A reasonable approach
is to design the compensation network at this worst-case
corner and then verify that sufficient phase margin exists
across all other operating conditions. In this example ap-
plication, at VIN = 1.8V and the full 300mA load current,
the right-half plane zero will be located at 100kHz and this
will be a dominant factor in determining the bandwidth of
the control loop.
The first step in designing the compensation network
is to determine the target crossover frequency for the
compensated loop. This example will be designed for a
60° phase margin to ensure adequate performance over
parametricvariationsandvaryingoperatingconditions.As
aresult,thetargetcrossoverfrequency,fC,willbethepoint
at which the phase of the buck-boost converter reaches
–180°. It is generally difficult to determine this frequency
analytically, because it is significantly impacted by the Q
factor of the resonance in the power stage. As a result,
it is best determined from a Bode plot of the buck-boost
converter as shown in Figure 10. This Bode plot is for the
LTC3536buck-boostconverterusingthepreviouslyspeci-
fied power stage parameters and was generated from the
small signal model equations using LTSpice software.
In this case, the phase reaches –180° at 37.8kHz making
fC = 37.8kHz the target crossover frequency for the com-
pensated loop. From the Bode plot of Figure 9 the gain of
the power stage at the target crossover frequency is –2dB.
At this point in the design process, there are three con-
straints that have been established for the compensation
network. It must have +2dB gain at fC = 37.8kHz, a peak
phase boost of 60° and the phase boost must be centered
at fC = 37.8kHz.
An analytical approach can be used to design a compensa-
tionnetworkwiththedesiredphaseboost,centerfrequency
and gain. In general, this procedure can be cumbersome
due to the large number of degrees of freedom in a TypeIII
compensation network. However the design process can
be simplified by assuming that both compensation zeros
GAIN
(dB)
30
24
18
12
6
0
–6
–12
–18
–24
–30
–36
–42
1
10
100
1k
10k
100k
FREQUENCY (Hz)
1M
10M
100M
PHASE
(DEG)
–220
–240
3536 F10
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
GAIN
PHASE
VO/VC
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相關代理商/技術參數 |
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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 開關穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數: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: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) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面: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 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數: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:- 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) 供應商設備封裝: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 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數: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:- 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) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LTC3536IDD#TRPBF | 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 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數: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:- 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) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LTC3536IMSE#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 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數: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:- 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) 供應商設備封裝:10-MSOP 裸露焊盤 |
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