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MC33341PG

Power Supply Battery Charger Regulation Control Circuit

ON Semiconductor 

Source

MC33341

Load

R2

Opto

Isolator

8

7

6

5

VCC

VCC

VCC

VCC

1.2 V Differential Amp

R1

Disable Logic 0.4 V

1.2 V

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

Battery or

Resistive

Load

R3

Comp

Source

Return

RS

Load

The above figure shows the MC33341 configured for source return low−side current sensing allowing a common power path between

Source + and Load +. This configuration is especially suited for negative output applications where a common ground path, Source + to

Load +, is desired. The Inverting Amplifier inputs, Pins 1 and 4, 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 high peak levels of inrush current are possible. The resistor value should be chosen to limit the negative

substrate current to less than 20 mA. Excessively large values for R3 will degrade the current sensing accuracy.

ǒ Ǔ Vreg + Vth(V)

R2

R1

)

1

ǒ Ǔ + 1.2

R2

R1

)

1

Ireg

+

Vth(I LS–)

RS

+

–0.2

RS

ǒ Ǔ Ipk RS – 0.6

R3 +

0.02

Figure 16. Source Return Low−Side Current Sensing with

Internally Fixed Current and Voltage Thresholds

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