參數(shù)資料
型號(hào): SC310ASKTRT
廠商: Semtech
文件頁(yè)數(shù): 11/12頁(yè)
文件大小: 0K
描述: IC AMP CURRENT SENSE SOT-23-6
標(biāo)準(zhǔn)包裝: 1
放大器類型: 電流檢測(cè)
電路數(shù): 1
-3db帶寬: 2MHz
電流 - 輸入偏壓: 150µA
電流 - 電源: 270µA
電壓 - 電源,單路/雙路(±): 3 V ~ 25 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: SOT-23-6
供應(yīng)商設(shè)備封裝: SOT-23-6
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面: 1358 (CN2011-ZH PDF)
其它名稱: SC310ASKDKR
8
2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC310
Block Diagram
Detailed Description
SC310 is a unidirectional high-side current sense ampli-
fier for precision current monitoring. It has a wide com-
mon-mode range of 2.7 to 25V and allows high-side cur-
rent-sensing at voltages greater than supply voltage (V
CC).
The SC310 operates as follows: Current from source (as
shown in the typical applications circuit on page. 1), flows
through RSENSE to the load. Since the inverting input of
amplifier A has a high input impedance, negligible cur-
rent flows through R5 (neglecting the input bias current).
Amplifier A has an inverting input voltage which equals
V(CS+) - I
LOAD*RSENSE. The amplifier’s high open-loop gain
forces the non-inverting input voltage to the same volt-
age as the inverting input. The drop across R4 equals
I
LOAD*RSENSE.
Since I
R4 flows through R4, IR4 =
(I
LOAD*RSENSE)/R4. Resistor R3 then sets the overall gain
for amplifier A, A1, A2 or A3 (neglecting the input bias
currents for non-inverting inputs for amplifiers A and B).
The second amplifier, B, is a fixed gain stage (gain = B)
and the final output includes the gain obtained from this
stage.
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The SC310 has three gain versions as follows:
VCC
+
-
+
-
R1
R2
R3
R4
R5
Q1
A
B
Gain = A1
Gain = A2
Gain = A3
Gain = B
CS-
GND
SHDN
CS+
OUT
1k
10k
20k
5k
1k
Disable
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