MC33341 Просмотр технического описания (PDF) - Motorola => Freescale
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MC33341 Datasheet PDF : 20 Pages
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Source
MC33341
Figure 14. Source High–Side Current Sensing with
Externally Adjustable Current and Internally Fixed Voltage Thresholds
RS
Load
R3
R2
Opto
Isolator
Current
Control
Source
Return
8
7
6
5
VCC
VCC
VCC
1.2 V Differential Amp
Disable Logic 0.4 V
1.2 V
VCC
VCC
Differential Amp
R
R
RR
R
R
VCC
VCC
Inverting Amp
Vsen
Transconductance
Vth V
Amp
Isen
Ith
I
VCC
Reference
0.2 V 0.4 V 1.2 V
VCC
0.2 V
1
2
3
4
Comp
R1
Battery or
Resistive
Load
Load
The above figure shows the MC33341 configured for source high–side current sensing with an externally adjustable current
threshold. Operation of this circuit is similar to that of Figure 13. The current regulation threshold can be adjusted over a range
of 0 V to 200 mV with respect to Pin 4.
ǒ Ǔ + ) Vreg
Vth(V)
R2
R1
1
ǒ Ǔ + ) 1.2
R2
R1
1
+ Vth(Pin 2)
Ireg
RS
ǒ Ǔ + Ipk RS – 0.6
R3
0.02
8
MOTOROLA ANALOG IC DEVICE DATA
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