IRSF3011L Ver la hoja de datos (PDF) - International Rectifier

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IRSF3011L

FULLY PROTECTED POWER MOSFET SWITCH

International Rectifier 

IRSF3011

Switching Characteristics

In the IRSF3011, the control logic and the protection

circuits are powered from the input pin. When positive

voltage appears at the input pin, the R-S flip-flop turns

Q2 on and connects the gate of the main device to the

input.

The turn-on speed is limited by the channel resistance

of Q2 and the gate charge requirements of Q1. The

typical switching waveforms at 5V input voltage are

shown in Figure A2. Using higher input voltage will

improve the turn-on time but it will not affect the turn-

off switching speed.

Input voltage 5V/div.

Drain voltage 5V/div.

Drain Current: 1A/div.

Figure A1. Block Diagram

Input voltage 5V/div.

Drain voltage 5V/div.

Drain Current: 1A/div.

Time: 1msV/div.

Figure A2. Waveforms switching clamped inductive

load using 5V input voltage

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Time: 1msV/div.

Figure A3. Switching waveforms with 7V Input

voltage

The typical waveforms at 7V input voltage are shown

in Figure A3. In typical switching applications (below

60kHz) the difference in switching losses between

the IRSF3011 / IRSF3012 and the same size standard

MOSFET is negligible.

Over-Current Protection

When the drain current exceeds the preset limit, the

protection circuit resets the internal flip-flop and turns

Q1 off. Normal operation can be restored by holding

the input voltage below the specified threshold level

(approx. 1.3V) for the specified minimum treset time.

The typical waveforms at over-current shut-down are

shown in Figure A4. After turn-on, the current in the

inductor at the drain starts ramping up. At about 7A,

the over-current protection shuts down the device.

Over-Temperature Protection

Figure A5 illustrates the operation of the over-tem-

perature protection. The IRSF3011 / IRSF3012

switches a 2W resistive load to a 10V power supply.

When the thermal balance is established, the junc-

tion temperature is limited on a pulse-by-pulse basis.

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