參數(shù)資料
型號(hào): MC33341P
廠商: MOTOROLA INC
元件分類(lèi): 電源管理
英文描述: POWER SUPPLY BATTERY CHARGER REGULATION CONTROL CIRCUIT
中文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8
封裝: PLASTIC, DIP-8
文件頁(yè)數(shù): 7/20頁(yè)
文件大小: 374K
代理商: MC33341P
MC33341
7
MOTOROLA ANALOG IC DEVICE DATA
Figure 13. Source High–Side Current Sensing with
Internally Fixed Voltage and Current Thresholds
RS
Load
R1
Battery or
Resistive
Load
Source
Return
Source
R2
R3
Comp
The above figure shows the MC33341 configured for source high–side current sensing allowing a common ground path
between Load – and Source Return –. The Differential Amplifier inputs, Pins 1 and 6, are used to sense the load induced
voltage drop that appears across resistor RS. The internal voltage and current regulation thresholds are selected by the
respective external connections of Pins 2 and 6. Resistor R3 is required in applications where a high peak level of reverse
current is possible if the source inputs are shorted. The resistor value should be chosen to limit the input current of the internal
VCC clamp diode to less than 20 mA. Excessively large values for R3 will degrade the current sensing accuracy.
Vreg
Vth(V)
R2
R1
1
1.2
R2
R1
1
Ireg
Vth(I HS)
RS
0.2
RS
R3
IpkRS
– 0.6
0.02
V
I
Load
8
7
6
5
1
2
3
4
R
R
R
R
R
VCC
VCC
VCC
VCC
VCC
VCC
0.4 V
1.2 V
R
0.2 V
VCC
0.2 V
0.4 V 1.2 V
VCC
1.2 V
VCC
Inverting Amp
Transconductance
Amp
Differential Amp
Disable Logic
Differential Amp
Opto
Isolator
Vsen
Vth
Isen
Ith
Reference
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