MC33341D 查看數據表（PDF） - ON Semiconductor

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MC33341D

Power Supply Battery Charger Regulation Control Circuit

ON Semiconductor 

Source

Opto

Isolator

Source

Return

MC33341

R2

R3

Load

RS

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 load high−side current sensing allowing common paths for both power and ground,

between the source and load. 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 high peak levels of load current are possible from the battery or load bypass capacitor. 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 ill degrade the current sensing accuracy.

ǒ Ǔ Vreg + Vth(V)

R2

R1

)

1

ǒ Ǔ + 1.2

R2

R1

)

1

Ireg

+

Vth(I HS)

RS

+

0.2

RS

ǒ Ǔ Ipk RS – 0.6

R3 +

0.02

Figure 18. Load High−Side Current Sensing with

Internally Fixed Current and Voltage Thresholds

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