參數(shù)資料
型號(hào)： LT1185M
廠商： Linear Technology Corporation
英文描述： 9-Bit Odd/Even Parity Generators/Checkers 14-SOIC 0 to 70
中文描述： 低壓差穩(wěn)壓器
文件頁(yè)數(shù)： 5/16頁(yè)
文件大?。?/td> 211K
代理商： LT1185M
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
value to supply full base current for Q3 under worst-case
Figure 1. Block Diagram
APPLICATIOU
U
W
U
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
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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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