J112 datasheet(3/5 Pages) ONSEMI

Il numero della parte	J112

Spiegazioni elettronici	JFET Chopper Transistors N.Channel . Depletion

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J111, J112

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3

1000

1.0

2.0

5.0

10

20

50

100

200

500

0.5 0.7 1.0

2.0

3.0

5.0 7.0

10

20

30

50

ID, DRAIN CURRENT (mA)

Figure 1. Turn−On Delay Time

RK = 0

TJ = 25°C

J111

J112

J113

VGS(off) = 12 V

= 7.0 V

= 5.0 V

RK = RD′

1000

1.0

2.0

5.0

10

20

50

100

200

500

0.5 0.7 1.0

2.0

3.0

5.0 7.0

10

20

30

50

ID, DRAIN CURRENT (mA)

Figure 2. Rise Time

RK = RD′

RK = 0

TJ = 25°C

J111

J112

J113

VGS(off) = 12 V

= 7.0 V

= 5.0 V

1000

1.0

2.0

5.0

10

20

50

100

200

500

0.5 0.7 1.0

2.0

3.0

5.0 7.0

10

20

30

50

ID, DRAIN CURRENT (mA)

Figure 3. Turn−Off Delay Time

RK = RD′

RK = 0

TJ = 25°C

J111

J112

J113

VGS(off) = 12 V

= 7.0 V

= 5.0 V

1000

1.0

2.0

5.0

10

20

50

100

200

500

0.5 0.7 1.0

2.0

3.0

5.0 7.0

10

20

30

50

ID, DRAIN CURRENT (mA)

Figure 4. Fall Time

RK = RD′

RK = 0

TJ = 25°C

J111

J112

J113

VGS(off) = 12 V

= 7.0 V

= 5.0 V

TYPICAL SWITCHING CHARACTERISTICS

NOTE 1

The switching characteristics shown above were measured using a test

circuit similar to Figure 5. At the beginning of the switching interval,

the gate voltage is at Gate Supply Voltage (−VGG). The Drain−Source

Voltage (VDS) is slightly lower than Drain Supply Voltage (VDD) due

to the voltage divider. Thus Reverse Transfer Capacitance (Crss) or

Gate−Drain Capacitance (Cgd) is charged to VGG + VDS.

During the turn−on interval, Gate−Source Capacitance (Cgs)

discharges through the series combination of RGen and RK. Cgd must

discharge to VDS(on) through RG and RK in series with the parallel

combination of effective load impedance (R

′D) and Drain−Source

Resistance (rds). During the turn−off, this charge flow is reversed.

Predicting turn−on time is somewhat difficult as the channel resistance

rds is a function of the gate−source voltage. While Cgs discharges, VGS

approaches zero and rds decreases. Since Cgd discharges through rds,

turn−on time is non−linear. During turn−off, the situation is reversed

with rds increasing as Cgd charges.

The above switching curves show two impedance conditions; 1) RK

is equal to RD, which simulates the switching behavior of cascaded

stages where the driving source impedance is normally the load

impedance of the previous stage, and 2) RK = 0 (low impedance) the

driving source impedance is that of the generator.

RGEN

50

W

VGEN

INPUT

RK

50

W

RGG

VGG

50

W

OUTPUT

RD

+VDD

RT

SET VDS(off) = 10 V

INPUT PULSE

tr

tf

PULSE WIDTH

DUTY CYCLE

≤ 0.25 ns

≤ 0.5 ns

= 2.0

ms

≤ 2.0%

RGG & RK

RD +

RD(RT ) 50)

RD ) RT ) 50

Figure 5. Switching Time Test Circuit

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