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参数资料
| 型号： | LT1185C |
| 厂商： | Linear Technology Corporation |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 无电容，NMOS管，150mA的低压差稳压器的反向电流保护 |
| 文件页数： | 9/16页 |
| 文件大小： | 211K |
| 代理商： | LT1185C |
9
LT1185
APPLICATIU
U
W
U
Figure 2. Proper Connection of Positive Sense Lead
Shutdown Techniques
The LT1185 can be shut down by open-circuiting the REF
pin. The current flowing into this pin must be less than
0.4
μ
A to guarantee shutdown. Figure 3 details several
ways to create the “open” condition, with various logic
levels. For variations on these schemes, simply remember
that the voltage on the REF pin is 2.4V negative with
respect to the ground pin.
Output Overshoot
Very high input voltage slew rate during start-up may
cause the LT1185 output to overshoot. Up to 20% over-
shoot could occur with input voltage ramp-up rate exceed-
ing 1V/
μ
s. This condition cannot occur with normal 50Hz
to 400Hz rectified AC inputs because parasitic resistance
and inductance will limit rate of rise even if the power
switch is closed at the peak of the AC line voltage. This
assumes that the switch is in the AC portion of the circuit.
If instead, a switch is placed directly in the regulator input
so that a large filter capacitor is precharged, fast input slew
rates will occur on switch closure. The output of the
regulator will slew at a rate set by current limit and output
capacitor size; dVdt = I
LIM
/C
OUT
. With I
LIM
= 3.6A and C
OUT
= 2.2
μ
F, the output will slew at 1.6V/
μ
s and overshoot can
occur. This overshoot can be reduced to a few hundred
millivolts or less by increasing the output capacitor to
10
μ
F and/or reducing current limit so that output slew rate
is held below 0.5V/
μ
s.
A second possibility for creating output overshoot is
recovery from an output short. Again, the output slews at
a rate set by current limit and output capacitance. To avoid
overshoot, the ratio I
LIM
/C
OUT
should be less than
0.5
×
10
6
. Remember that load capacitance can be added
to C
OUT
for this calculation. Many loads will have multiple
supply bypass capacitors that total more than C
OUT
.
+
–
R1*
2.37k
R2
REF
GND
FB
V
OUT
V
IN
LT1185
R
LIM
+
–
V
IN
V
OUT
LT1185 F02
LOAD
PARASITIC
LEAD RESISTANCES
– r
b
+
I
GND
r
a
*R1 SHOULD BE CONNECTED DIRECTLY TO GROUND LEAD, NOT TO THE LOAD,
SO THAT r
≈
0
. THIS LIMITS THE OUTPUT VOLTAGE ERROR TO (I
)(r
b
).
ERRORS CREATED BY r
ARE MULTIPLIED BY (1 + R2/R1). NOTE THAT V
INCREASESWITH INCREASING GROUND PIN CURRENT. R2 SHOULD BE CONNECTED
DIRECTLY TO LOAD FOR REMOTE SENSING
相关PDF资料 |
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|---|---|
| LT1185CT | 9-Bit Odd/Even Parity Generators/Checkers 14-SOIC 0 to 70 |
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| LT1185IT | 9-Bit Odd/Even Parity Generators/Checkers 14-SOIC 0 to 70 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1185CQ | 功能描述:IC REG LDO NEG ADJ 3A DDPAK-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
| LT1185CQ#PBF | 功能描述:IC REG LDO NEG ADJ 3A DDPAK-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:最高 5.5V 电压 - 压降（标准）:0.12V @ 150mA 稳压器数量:1 电流 - 输出:150mA（最小值） 电流 - 限制（最小）:220mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) 其它名称:ADP160AUJZ-3.0-R7TR |
| LT1185CQ#TR | 功能描述:IC REG LDO NEG ADJ 3A DDPAK-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
| LT1185CQ#TRPBF | 功能描述:IC REG LDO NEG ADJ 3A DDPAK-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
| LT1185CQPBF | 制造商:Linear Technology 功能描述:LDO Regulator Neg/Pos 2.5-25V 3A DDPAK6 |
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