參數(shù)資料
型號(hào)： 522976X
英文描述： IC
中文描述： 集成電路
文件頁(yè)數(shù)： 5/16頁(yè)
文件大?。?/td> 292K
代理商： 522976X
5
LT1185
Block Diagram
A simplified block diagram of the LT1185 is shown in
Figure 1. A 2.37V bandgap reference is used to bias the
input of the error amplifier A1, and the reference amplifier
A2. A1 feeds a triple NPN pass transistor stage which has
the two driver collectors tied to ground so that the main
pass transistor can completely saturate. This topology
normally has a problem with unlimited current in Q1 and
Q2 when the input voltage is less than the minimum
required to create a regulated output. The standard “fix”
for this problem is to insert a resistor in series with Q1 and
Q2 collectors, but this resistor must be low enough in
Figure 1. Block Diagram
300mV
I1
2
μ
A
R1
350
200mV
D2
D4
D3
–
+
A5
–
+
A4
–
+
A3
V
IN
R2
0.055
–
+
A1
–
+
A2
V
2.37V
V
OUT
FB
GND
R
LIM
(EXTERNAL)
REF
D1
LT1185 BD
Q1
Q2
Q3
Q4
APPLICATIOU
U
W
U
value to supply full base current for Q3 under worst case
conditions, resulting in very high supply current when the
input voltage is low. To avoid this situation, the LT1185
uses an auxiliary emitter on Q3 to create a drive limiting
feedback loop which automatically adjusts the drive to Q1
so that the base drive to Q3 is just enough to saturate Q3,
but no more. Under saturation conditions, the auxiliary
emitter is acting like a collector to shunt away the output
current of A1. When the input voltage is high enough to
keep Q3 out of saturation, the auxiliary emitter current
drops to zero even when Q3 is conducting full load current.
相關(guān)PDF資料
PDF描述
522977R Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits
522978G IC-SWITCHING REGULATOR
522979E Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits
522980H IC
522981F Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
522977R 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC
522978G 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-SWITCHING REGULATOR
522979E 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC
522980H 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC
522981F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*