Datasheet KA2803B Datasheet (Fairchild Semiconductor)

+

KA2803B

Earth Leakage Detector

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Features

• Low Power Consumption PD =5mW, 100V/200V

• Built-in Voltage Regulator

• High Gain Differential Amplifier

• 0.4mA Output Current Pulse to Trigger SCR' S

• Low External Part Count

• DIP Package (8-DIP), High Packing Density

• High Noise Immunity, Large Su rge Margin

• Super Temperature Characteristic of Input Sensitivity

• Wide Operating Temperature Range (T

+80°C)

• Operation from 12 to 20V Input

= -25°C ~

A

Functions

• Differential Amplifier

• Level Comparator

• Latch Circuit

Block Diagram

V

CC

8

7

O

S(Output)

Description

The KA2803B is designed for use in earth leakage circuit interrupters, for stable operation of the AC line in breakers. The input of the differential amplifier is connected to the secondary coil of ZCT(Zero Current Transformer). The amplified output of differential amplifier is integrated at external capacitor to gain adequate time delay that is specified in KSC4613. The level comparator generates high level when earth leakage current is greater than the fixed level.

8-DIP

1

8-SOP

1

N

R

6

S

C

5

Bias V ol ta ge

Bias

Internal

Latch

Reference

Voltage

Generator

Reference

Zener Internal

Zener

Protect

1

V

R

2

V

I

+

-

3

GND

Latch

Circuit

4

O

D

Rev. 1.0.4

KA2803B

Absolute Maximum Ratings (TA = 25°°°°C)

Parameter Symbol Value Unit

Supply Voltage V Supply Current I Power Dissipation P Lead Temperature (Soldering 10sec) T Operating Temperature T Storage Temperature T

CC

D

LEAD

OPR STG

20 V

8mA 300 mW 260 °C

- 25 ~ +80 °C

- 65 ~ +150 °C

Electrical Characteristics

(TA = -25°C to 80°C)

Parameter Symbol Conditions Circuit Min. Typ. Max. Unit

Supply Current 1 I

Trip Voltage V

Differential Amplifier Output Current 1

Differential Amplifier Output Current 2

I

O(D)

I

O(D)

Output Current I

Latch on Voltage V Latch Input Current I Output Low Current I

SCON

OSL

Diff. Input Clamp Voltage V Maximum Current Voltage V Supply Current 2 I

Latch Off Supply Voltage V

SOFF

Response Time(Note1) T

CC

T

O

IDC

SM

S2

ON

V

= 12V

CC

V

= Open

R

V

= 2V

I

VCC = 16V V

= 2V ~ 2.02V VI = 2V

R

(-25°C)

1

(80°C) - - 480

2141618mV

(Note1) 12.5 14.2 17 mVrms VCC = 16V

(V

=30mV , VOD =1.2V)

R-VI

VCC =16V, VOD =0.8V V

, VI =V

R

P (Note2)

3 -12 20 -30 µA

4172737

VSC = 1.4V (-25°C)

= 0.8V (25°C) 200 400 800

OS

= 16V (25°C) 100 300 600

V

CC

5

VCC = 16V 6 0.7 1.0 1.4 V V

= 16V 7 -13 -7 -1 µA

CC

VCC = 12V, V V

= 16V, I

CC

I

= 7mA 10 20 24 28 V

SM

VCC = 12V, V

= 0.2V 8 200 800 1400 µA

OSL

= 100mA 9 0.4 1.2 2 V

IDC

= 0.6V 11 200 400 900 µA

OSL

VOS = 12V

= 1.8V

SC

I

=100mA

IDC

VCC = 16V V

= 0.3V , 1V < VX < 5V

R-VI

12 7.0 8.0 9.0 VV

13 2 3 4 mS

- - 580

(rms)

200 400 800

µA(25°C) 300 400 530

µA

µAV

Note:

1. This Parameter, although guaranteed, is not tested in Production.

2. V

P=Vpin1

-0.03V at V

pin2

=2.0V , V

pin4

=1.5V

2

Test Circuit

Supply Current1 Trip Voltage

1

Open

2V

Differential Amplifier Output

3

Current1

Open

V

p

A

1.5V

1 2 3 4

I

O(D)=?

KA2803B

V

for VP Measurement

PIN1

473

Pin1 Voltage

Vpin1

2V

DVM

Output Current

5

1.5V

1

8 7

2

6

3 4

5

* V

p

16V

Open

=Vpin1-0.03V

473

2

8 7

12V

Open

Vr=2V~2.02V

2V Open

6 5

473

Differential Ampl ifie r Outp ut

4

DVM

1

8 7

2

6

3 4

5

16V

Open

Current2

Open

16V

Open Open

Open

1

8 7

2

6

3 4

5

1.4V

16V

Iout

0.8V

A

473

Open

16V

V

p

8 7 6 5

Open

1

8

2

7 6

3

5

4

I

O(D)=?

A

0.8V

6

Latch on Voltage

Open Open

9

Diff. Input Clamp Voltage

100mA V

Open

DVM

IDC

1 2

3

4

0.6V

8 7 6 5

1.5V

1

2 3 4

Open

Latch Off Supply Voltage

12

100mA

Open

1

2 3 4

Open

?

8 7 6

5

0.8V

Latch Input Current Output Low Current

7

> 6V

Open Open

473

16V

DVM

V

1

8 7

2

6

3

4

5

?

16V

DVM

473

A

Open

1.5V

0.6V

Maximum Curr ent Voltage Su p p l y Current2

10

I=7mA

473

Open Open

Open

Response Time

13

0.3V

p-p

1V<Vx<5

100

8 7 6 5

473

A

Open

DVM

>

10V

473

1

8

2

7

3

6

5

4

1

2 3 4

8 7

16V

Open

6

5

Open

12V

DVM

473

> 6V

VSM=?

16V

8

11

Open

Open Open

Open

A

473

I

cc

A

0.6V

?

=?

473

12V

0.2V

12V

1

8 7

2

6

3

5

4

1

8 7

2

6

3

5

4

3

KA2803B

Typical Characteristics

Figure 1. Supply Curre nt

Figure 3. Diffe rential Amp. Output Current

VR, VI=VP, VOD=0.8V

Figure 2. Differential Am p. Output Curre nt

VR-VI=30mV, VOD=1.2V

Figure 4. Output Current

Figure 5. Output Low Current

Figure 6. Vcc Voltage Vs. Supply Current 1

4

KA2803B

Typical Characteristics

Figure 7. Differential Amp. Output Current 1

(Continued)

Figure 8. Differential Amp. Output

Figure 9. Latch Input Current

Figure 11. Output Current

Figure 10. Output Low Current

Figure 12. Vcc Voltage Vs. Supply Current 2

5

KA2803B

Typical Characteristics

Figure 13. Differenti al Inp ut Clamp Voltage

(Continued)

Figure 14. Latch Off Supply Voltage

Figure 15. Latch On Input Voltage

Figure 17. Trip & Output

Figure 16. Maximum Supply

6

KA2803B

Typical Characteristics

INPUT

VR: Variable

: Constant

V

I

OD OUTPUT

OUTPUT

O

S

(Continued)

Figure 18. Output Response Time

7

KA2803B

Application Circuit

Figure 1. Full Wave Application Circuit

Figure 2. Half Wave Application Circuit

Application Note

(refer to full wave application circuit Fig. 1)

The Fig 1 shows the KA2803B connected in a typical leakage current detector system. The power is applied to the V The resistor R The value of C

and capacitor CS are chosen so that pin 8 voltage is at least 12V.

S

is recommended above 1µF at this time.

S

If the leakage current is at the load, it is detected by the zero current transformer (ZCT). The output voltage signal of ZCT is amplified by the differential amplifier of the KA2803B internal circuit and appears as half cycle sine wave signal referred to input signal at the output of the amplifier. The amplifier closed loop gain is fixed about 1000 times with internal feedback resistor to compensate for zero current transformer (ZCT) Variations. The resistor R

should be selected so that the breaker satisfies the required sensing current.

L

The protection resistor R to protect the earth leakage detector IC the KA2803B. The range of R The capacitor C

is from several hundredΩ to several kΩ.

P

, is for the noise canceller and standard value of C1 is 0.047µF. Also the capacitor C2 is noise canceller

1

capacitance but it is not usually used. When high noise is only appeared at this system 0.047µF capacitor may be connected between pin 6 and pin 7. The amplified signal is finally appeared to the Pin 7 with pulse signal through the internal latch circuit of the KA2803B. This signal drives the gate of the external SCR which energizes the trip coil which opens the circuit breaker. The trip time of breaker is decided by the capacitor C This capacitor should be selected under 1µF for the required the trip time. The full wave bridge supplies power to the KA2803B during both the positive and negative half cycles of the line voltage. This allows the hot and neutral lines to be interchanged. If your application want the detail information, request it on our application circuit designer of KA2803B.

terminal (Pin 8) of the KA2803B directly from the power line.

CC

is not usually used put when the high current is injected at the breaker, this resistor should be used

P

and the mechanism breaker.

3

8

Mechanical Dimensions

Package

6.40 ±0.20

0.252

±0.008

8-DIP

Dimensions in millimeters

0.79

0.031

()

±0.10

KA2803B

#1

#4 #5

7.62

0.300

#8

MAX

9.20 ±0.20

9.60

0.378

5.08 MAX

0.200

3.40 ±0.20

0.134 ±0.008

0.362 ±0.008

0.33

0.013

3.30 ±0.30

0.130 ±0.012

MIN

0.46

2.54

0.018 ±0.004

0.100

1.524 ±0.10

0.060 ±0.004

0~15°

0.25

0.010

+0.10 –0.05

+0.004 –0.002

9

KA2803B

Mechanical Dimensions

Package

#1

#4

6.00

0.006

+

-0.002

0.004

0.15

-0.05

+

0.10

0.236

3.95

0.156

(Continued)

8-SOP

±0.30

±0.012

±0.20

±0.008

#8

#5

1.55

0.061

±0.20

±0.008

MAX

5.13

0.202

1.80

0.071

±0.20

4.92

MAX

Dimensions in millimeters

0.1~0.25

MIN

0.004~0.001

0.56

0.022

()

±0.008

0.194

±0.004

±0.10

0.41

0.016

1.27

0.050

MAX0.10

MAX0.004

10

0.50

0.020

±0.20

±0.008

5.72

0.225

0~8°

Ordering Information

Product Number Package Operating Temperature

KA2803B 8-DIP

KA2803BD 8-SOP

-20 ~ +80°C

KA2803B

11

KA2803B

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURT HER NOTICE TO ANY PRODUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTIO N OR DESIGN. FAIRCH IL D DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER IT S PATENT RIGHTS, NOR THE RIGHTS OF OTHE RS.

LIFE SUPPORT POL I CY

FAIRCHILD’S PR ODUCTS ARE NOT AUTH ORIZED FOR USE AS C RITICAL COMPONENT S IN LIFE SUPPORT DE VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein :

1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with

2. A critical component in any component of a life support device or sy stem whose fai lure to perform can be reasonably expec ted to cause the failur e of the life support device or system, or to affect its safety or effec t iv ene ss .

instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

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9/5/02 0.0m 001

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Datasheet KA2803B Datasheet (Fairchild Semiconductor)

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