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參數(shù)資料
| 型號： | LT1302- 5 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower High Output Current Step-Up Fixed 5V DC/DC Converters(微功耗,高輸出電流,5V固定輸出電壓,步升DC/DC變換器) |
| 中文描述： | 微高輸出電流升壓型固定5V直流/直流轉(zhuǎn)換器（微功耗，高輸出電流，5V的固定輸出電壓，步升直流/直流變換器） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 313K |
| 代理商： | LT1302- 5 |
9
LT1302/LT1302-5
APPLICATIO
S I
FOR
ATIO
U
Frequency Compensation
Obtaining proper RC values for the frequency compensa-
tion network is largely an empirical procedure, since
variations in input and output voltage, topology, capacitor
ESR and inductance make a simple formula elusive. As an
example, consider the case of a 2.5V to 5V boost converter
supplying 500mA. To determine optimum compensation,
the circuit is built and a transient load is applied to the
circuit. Figure 7 shows the setup.
In Figure 7a, the V
C
pin is simply left floating. Although
output voltage is maintained and transient response is
good, switch current rises instantaneously to the internal
current limit upon application of load. This is an undesir-
able situation as it places maximum stress on the switch
and the other power components. Additionally, efficiency
is well down from its optimal value. Next, a 0.1
μ
F capacitor
is connected with no resistor. Figure 7b details response.
Although the circuit eventually stabilizes, the loop is quite
underdamped. Initial output “sag” exceeds 5%. Aberrant
W
U
U
behavior in the 4th graticule is the result of the LT1302’s
Burst Mode comparator turning off all switching as output
voltage rises above its threshold.
In Figure 7c, the 0.1
μ
F capacitor has been replaced by a
0.01
μ
F unit. Undershoot is less but the response is still
underdamped. Figure 7d shows the results of the 0.1
μ
F
capacitor and a 10k resistor in series. Now some amount
of damping is observed, and behavior is more controlled.
Figure 7e details response with a 0.01
μ
F/10k series net-
work. Undershoot is down to around 100mV, or 2%. A
slight underdamping is still noticeable.
Finally, a 0.01
μ
F/24k series network results in the re-
sponse shown in Figure 7f. This has optimal damping,
undershoot less than 100mV and settles in less than 1ms.
The V
C
pin is sensitive to high frequency noise. Some
layouts may inject enough noise to modulate peak switch
current at 1/2 the switching frequency. A small capacitor
connected from V
C
to ground will eliminate this. Do not
exceed 1/10 of the compensation capacitor value.
Figure 7a. V
C
Pin Left Unconnected. Output Shows
Low Frequency Components Under Load
Figure 7b. 0.1
μ
F from V
C
to Ground.
Better, but More Improvement Needed
2ms/DIV
1302 F07b
V
100mV/DIV
AC COUPLED
I
LOAD
510mA
10mA
V
100mV/DIV
AC COUPLED
2ms/DIV
1302 F07a
I
LOAD
510mA
10mA
Figure 7. Boost Converter with Simulated Load
V
IN
I
T
SHDN
SENSE
V
C
SW
L1
10
μ
H
D1
MTP3055EL
R
C
PULSE
GENERATOR
PGND
GND
0.1
μ
F
LT1302-5
10
2W
500
NC
1302 F07
V
IN
2.5V
50
+
C3
220
μ
F
+
C2
220
μ
F
C1, C2, C3 = AVX TPS SERIES
D1 = MOTOROLA MBRS130LT3
L1 = COILCRAFT DO3316-103K
+
C1
330
μ
F
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| LT1302CN8 | 功能描述:IC REG BOOST ADJ 0.12A 8DIP RoHS:否 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 |
| LT1302CN8#PBF | 功能描述:IC REG BOOST ADJ 0.12A 8DIP 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 |
| LT1302CN8-5 | 功能描述:IC REG BOOST 5V 0.6A 8DIP RoHS:否 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 |
| LT1302CN85#PBF | 制造商:Linear Technology 功能描述:LT1302CN85#PBF |
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