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| 型号： | LT3580MPMS8E#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV SEPIC 2A 8MSOP |
| 标准包装： | 50 |
| 类型： | 升压（升压），反相，Sepic |
| 输出数： | 1 |
| 输入电压： | 2.5 V ~ 32 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.5MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-MSOP-EP |
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LT3580
APPLICATIONS INFORMATION
Using the circuit in Figure 14 as an example, Table 3 shows
the parameters used to generate the bode plot shown in
Figure 5.
Table 3. Bode Plot Parameters
Diode Selection
Schottky diodes, with their low forward voltage drops and
fast switching speeds, are recommended for use with the
LT3580. The Microsemi UPS120 is a very good choice.
PARAMETER
R L
C OUT
R ESR
R O
C C
C F
C PL
R C
R1
R2
VALUE
21.8
10
10
305
1000
0
0
10
130
14.6
UNITS
Ω
μF
m Ω
k Ω
pF
pF
pF
k Ω
k Ω
k Ω
COMMENT
Application Specific
Application Specific
Application Specific
Not Adjustable
Adjustable
Optional/Adjustable
Optional/Adjustable
Adjustable
Adjustable
Not Adjustable
Where the input-to-output voltage differential exceeds 20V,
use the UPS140 (a 40V diode). These diodes are rated to
handle an average forward current of 1A.
Oscillator
The operating frequency of the LT3580 can be set by the
internal free-running oscillator. When the SYNC pin is
driven low (< 0.4V), the frequency of operation is set by
a resistor from R T to ground. An internally trimmed timing
capacitor resides inside the IC. The oscillator frequency is
calculated using the following formula:
V OUT
V IN
12
5
V
V
Application Specific
Application Specific
f OSC =
91.9
(R T + 1)
g ma
g mp
L
f S
230
7
4.2
1.2
μmho
mho
μH
MHz
Not Adjustable
Not Adjustable
Application Specific
Adjustable
where f OSC is in MHz and R T is in k Ω . Conversely, R T
(in k Ω ) can be calculated from the desired frequency
(in MHz) using:
In Figure 5, the phase is –140° when the gain reaches 0dB
giving a phase margin of 40°. The crossover frequency
R T =
91.9
f OSC
? 1
is 10kHz, which is more than three times lower than the
frequency of the RHP zero to achieve adequate phase
margin.
Clock Synchronization
The operating frequency of the LT3580 can be synchronized
to an external clock source. To synchronize to the external
180
160
0
–20
source, simply provide a digital clock signal into the SYNC
pin. The LT3580 will operate at the SYNC clock frequency.
140
120
100
80
60
40
20
0
–20
GAIN
PHASE
40 AT
10kHz
–40
–60
–80
–100
–120
–140
–160
–180
–200
The LT3580 will revert to the internal free-running oscillator
clock after SYNC is driven low for a few free-running clock
periods.
Driving SYNC high for an extended period of time effectively
stops the operating clock and prevents latch SR1 from
becoming set (see the Block Diagram). As a result, the
switching operation of the LT3580 will stop.
10
100
1k 10k
FREQUENCY (Hz)
100k
1M
3580 F05
The duty cycle of the SYNC signal must be between 35%
and 65% for proper operation. Also, the frequency of the
Figure 5. Bode Plot for Example Boost Converter
SYNC signal must meet the following two criteria:
3580fg
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3581 | 制造商:LINER 制造商全称:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3581EDE#PBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3581EDE#TRPBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN 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 |
| LT3581EDE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3581EDE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
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