参数资料
| 型号： | LT3693IMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3.5A 10MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.79 V ~ 30 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.45MHz |
| 电流 - 输出： | 3.5A |
| 同步整流器： | 无 |
| 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 |
LT3693
APPLICATIONS INFORMATION
Hot Plugging Safely
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of LT3693 circuits. However, these capaci-
tors can cause problems if the LT3693 is plugged into a
live supply (see Linear Technology Application Note 88 for
a complete discussion). The low loss ceramic capacitor,
combined with stray inductance in series with the power
source, forms an under damped tank circuit, and the
voltage at the V IN pin of the LT3693 can ring to twice the
nominal input voltage, possibly exceeding the LT3693’s
rating and damaging the part. If the input supply is poorly
controlled or the user will be plugging the LT3693 into an
CLOSING SWITCH
energized supply, the input network should be designed
to prevent this overshoot. Figure 9 shows the waveforms
that result when an LT3693 circuit is connected to a 24V
supply through six feet of 24-gauge twisted pair. The
?rst plot is the response with a 4.7μF ceramic capacitor
at the input. The input voltage rings as high as 50V and
the input current peaks at 26A. A good solution is shown
in Figure 9b. A 0.7 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. For high input voltages its impact on
ef?ciency is minor, reducing ef?ciency by 1.5 percent for
a 5V output at full load operating from 24V.
DANGER
SIMULATES HOT PLUG
I IN
V IN
LT3693
V IN
20V/DIV
RINGING V IN MAY EXCEED
+
4.7 F
ABSOLUTE MAXIMUM RATING
LOW
IMPEDANCE
ENERGIZED
24V SUPPLY
+
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
0.7
0.1 F
LT3693
4.7 F
LT3693
I IN
10A/DIV
(9a)
V IN
20V/DIV
I IN
10A/DIV
(9b)
V IN
20V/DIV
20 s/DIV
20 s/DIV
+
22 F
35V
+
4.7 F
AI.EI.
I IN
10A/DIV
(9c)
20 s/DIV
3693 F10
Figure 9. A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation when the LT3693 is Connected to a Live Supply
3693f
17
相关PDF资料 |
PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3694 | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2.6A Monolithic Buck |
| LT3694_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2.6A Monolithic Buck |
| LT3694-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2.6A Monolithic Buck |
| LT3694-1EFEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2.6A Monolithic Buck Regulator With Dual LDO |
| LT3694-1EUFDPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2.6A Monolithic Buck Regulator With Dual LDO |
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