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 13. Source High–Side Current Sensing with

Internally Fixed Voltage and Current Thresholds

RS

Load

R3

R2

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

Comp

Load

The above figure shows the MC33341 configured for source high–side current sensing allowing a common ground path

between Load – and Source Return –. The Differential Amplifier inputs, Pins 1 and 6, 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 a high peak level of reverse

current is possible if the source inputs are shorted. The resistor value should be chosen to limit the input current of the internal

VCC clamp diode 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

+ Vth(I HS)

Ireg

RS

+ 0.2

RS

ǒ Ǔ + Ipk RS – 0.6

R3

0.02

MOTOROLA ANALOG IC DEVICE DATA

7

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