MC33341 データシートの表示（PDF） - Motorola => Freescale

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MC33341

Power supply battery charger regulation control circuit

Motorola => Freescale 

Source

Voltage

Control

Opto

Isolator

Current

Control

Source

Return

MC33341

Figure 16. Source Return Low–Side Current Sensing with

Externally Adjustable 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 with externally adjustable voltage

and current thresholds. Operation of this circuit is similar to that of Figure 15. 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.

ǒ Ǔ + ) Vreg

Vth(Pin 6)

R2

R1

1

+ Vth(Pin 2)

Ireg – RS

ǒ Ǔ + Ipk RS – 0.6

R3

0.02

10

MOTOROLA ANALOG IC DEVICE DATA

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