MC33341

http://onsemi.com

8

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 with an externally adjustable current threshold.

Operation of this circuit is similar to that of Figure 14. The current regulation threshold can be adjusted over a range of 0 V to 200 mV with

respect to Pin 4.

V

I

Load

87

6

5

12

3

4

R

R

R

R

R

0.4 V

1.2 V

R

0.2 V

0.2 V 0.4 V 1.2 V

1.2 V

Inverting Amp

Transconductance

Amp

Differential Amp

Disable Logic

Differential Amp

Opto

Isolator

Reference

Figure 15. Source High−Side Current Sensing with

Externally Adjustable Current and Internally Fixed Voltage Thresholds

Vreg + Vth(V)

R2

R1

) 1

+ 1.2 R2

R1

) 1

Ireg +

V

th(Pin2)

R

S

R3

+

I

pk

R

S

– 0.6

0.02

Current

Control