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参数资料
| 型号： | LT3472EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV ADJ 50MA 10DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 ±34V |
| 输入电压： | 2.2 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 50mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LT3472
APPLICATIO S I FOR ATIO
Operation
The LT3472 uses a constant frequency, current mode
control scheme to provide excellent line and load regula-
tion. Operation can be best understood by referring to the
block diagram in Figure 1. At the start of each oscillator
cycle, the SR latch X1 is set, which turns on the power
switch Q1. A voltage proportional to the switch current is
added to a stabilizing ramp and the resulting sum is fed
into the positive terminal of the PWM comparator A2.
When this voltage exceeds the level at the negative input
of A2, the SR latch X1 is reset turning off the power switch
Q1. The level at the negative input of A2 is set by the error
Inductor Selection
A 22 μ H inductor is recommended for LT3472 step-up
channel. The inverter channel can use a 22 μ H or 47 μ H
inductor. 47 μ H inductors will provide slightly more cur-
rent. Small size and high efficiency are the major concerns
for most LT3472 applications. Inductors with low core
losses and small DCR (copper wire resistance) at 1.1MHz
are good choices for LT3472 applications. Some induc-
tors in this category with small size are listed in
Table 1. The efficiency comparison of different inductors
is shown in Figure 3.
amplifier A1, and is simply an amplified version of the
85
I NVERTER LOAD = 20mA
difference between the feedback voltage and the reference
voltage of 1.25V. In this manner, the error amplifier sets
80
LQH32CN220
the correct peak current level to keep the output in regu-
lation. If the error amplifier’s output increases, more
current is delivered to the output; if it decreases, less
current is delivered. The second channel is an inverting
converter. The basic operation is the same as the positive
channel. The SR latch X2 is also set at the start of each
oscillator cycle. The power switch Q2 is turned on at the
75
70
65
60
TOKO 1067FB-220M
LQH2MCN220
same time as Q1. The turn off of Q2 is determined by its
own feedback loop, which consists of error amplifier A3
0
5
10 15 20
LOAD CURRENT I O1 (mA)
25 30
3472 F02a
and PWM comparator A4. The reference voltage of this
negative channel is ground.
85
BOOST LOAD = 20mA
Switching waveforms with typical load conditions are
shown in Figure 2.
80
LQH32CN220
TOKO 1067FB-220M
V SWP
20V/DIV
I L1
100mA/DIV
V SWN
20V/DIV
I SWN
100mA/DIV
75
70
65
60
LQH2MCN220
V IN = 3.6V
500ns/DIV
3472 FO4
0
5
10 15 20
LOAD CURRENT I O2 (mA)
25
30
V POS = 15V, 20mA
V NEG = –7.5V, 30mA
Figure 2. Switching Waveforms
F02a
3472 F02b
Figure 3. Efficiency Comparison of Different Inductors
3472f
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相关代理商/技术参数 |
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| LT3473 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower 1A Boost Converter with Schottky and Output Disconnect |
| LT3473A | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower 1A Boost Converter with Schottky and Output Disconnect |
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| LT3473AEDE#PBF | 功能描述:IC REG BOOST ADJ 1A 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3473AEDE#TRPBF | 功能描述:IC REG BOOST ADJ 1A 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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