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| 型号： | LT3505EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.2A 8DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.78 V ~ 33.8 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 3.01MHz |
| 电流 - 输出： | 1.2A |
| 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-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3505
APPLICATIONS INFORMATION
damaging the part. If the input supply is poorly controlled
or the user will be plugging the LT3505 into an energized
supply, the input network should be designed to prevent
this overshoot.
Figure 10 shows the waveforms that result when an LT3505
circuit is connected to a 24V supply through six feet of
24-gauge twisted pair. The ?rst plot is the response with
a 2.2μF ceramic capacitor at the input. The input voltage
rings as high as 35V and the input current peaks at 20A.
One method of damping the tank circuit is to add another
capacitor with a series resistor to the circuit. In Figure 9b
an aluminum electrolytic capacitor has been added. This
capacitor’s high equivalent series resistance damps the
circuit and eliminates the voltage overshoot. The extra
capacitor improves low frequency ripple ?ltering and
can slightly improve the ef?ciency of the circuit, though
it is likely to be the largest component in the circuit. An
alternative solution is shown in Figure 9c. A 1 ? resistor
is added in series with the input to eliminate the voltage
overshoot (it also reduces the peak input current). A 0.1μF
capacitor improves high frequency ?ltering. This solution is
smaller and less expensive than the electrolytic capacitor.
For high input voltages its impact on ef?ciency is minor,
reducing ef?ciency only one percent for a 5V output at full
load operating from 24V.
Frequency Compensation
The LT3505 uses current mode control to regulate the
output. This simpli?es loop compensation. In particular,
the LT3505 does not require the ESR of the output capaci-
tor for stability allowing the use of ceramic capacitors to
achieve low output ripple and small circuit size.
Frequency compensation is provided by the components
tied to the V C pin, as shown in Figure 10. Generally a
+
LOW
IMPEDANCE
ENERGIZED
24V SUPPLY
+
CLOSING SWITCH
SIMULATES HOT PLUG
I IN
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
+
10 μ F
35V
AI.EI.
V IN
LT3505
2.2 μ F
LT3505
2.2 μ F
V IN
20V/DIV
I IN
5A/DIV
(9a)
V IN
20V/DIV
DANGER!
RINGING V IN MAY EXCEED
ABSOLUTE MAXIMUM
RATING OF THE LT3505
20 μ s/DIV
I IN
5A/DIV
(9b)
20 μ s/DIV
+
0.1 μ F
1 ?
LT3505
2.2 μ F
V IN
20V/DIV
I IN
5A/DIV
(9c)
20 μ s/DIV
3505 F10
Figure 10. A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation When the LT3505 is Connected to a Live Supply
3505fc
18
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| LT3505EDD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.2A, Step-Down Switching Regulator in 3mm × 3mm DFN |
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| LT3505EMS8E#PBF | 功能描述:IC REG BUCK ADJ 1.2A 8MSOP 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 |
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