Fairchild Semiconductor KA2803B Datasheet

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KA2803B

Earth Leakage Detector

www.fairchildsemi.com

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