MC33341

http://onsemi.com

10

Load

R1

Battery or

Resistive

Load

Source

Return

Source

R2

R3

Comp

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

thresholds. Operation of this circuit is similar to that of Figure 16. The respective voltage and current regulation threshold can be adjusted

over a range of 0 to 1.6 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 17. Source Return 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

Voltage

Control

Current

Control