MC33341 Просмотр технического описания (PDF) - Motorola => Freescale

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MC33341

Power supply battery charger regulation control circuit

Motorola => Freescale 

Source

Opto

Isolator

Source

Return

MC33341

Figure 15. Source Return Low–Side Current Sensing with

Internally Fixed Current and Voltage Thresholds

Load

R2

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

R3

Comp

RS

R1

Battery or

Resistive

Load

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

MOTOROLA ANALOG IC DEVICE DATA

9

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