MC33341

http://onsemi.com

14

R3

Load

R1

Battery or

Resistive

Load

Source

Return

Source

R2

Comp

The above figure shows the MC33341 configured for load low−side current sensing with an externally adjustable voltage and current

threshold. Operation of this circuit is similar to that of Figure 20. The respective voltage and current regulation threshold can be adjusted

over a range of 0 to 1.2 V and 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 21. Load Low−Side Current Sensing with

Externally Adjustable Current and Voltage Thresholds

Vreg + Vth(Pin6)

R2

R1

) 1

Ireg +

V

th(Pin2)

R

S

R3

+

I

pk

R

S

– 0.6

0.02

Current

Control

Voltage

Current