Fairchild Semiconductor MID400 Datasheet

1

2

3

4 5

6

7

8

V

CC

AUX

V

0

GND

Equivalent Circuit

N/C

8

1

8

1

AC LINE MONITOR

LOGIC-OUT DEVICE

MID400

DESCRIPTION

The MID400 is an optically isolated AC line-to-logic interface device. It is packaged in an 8-lead plastic DIP. The AC line voltage is monitored by two back-to-back GaAs LED diodes in series with an external resistor. A high gain detector circuit senses the LED current and drives the output gate to a logic low condition.

The MID400 has been designed solely for the use as an AC line monitor . It is recommended for use in any AC-to-DC control application where excellent optical isolation, solid state reliability, TTL compatibility, small size, low power, and low frequency operations are required.

FEATURES

• Direct operation from any line voltage with the use of an external resistor.

• Externally adjustable time delay

• Externally adjustable AC voltage sensing level

• High voltage isolation between input and output

• Compact plastic DIP package

• Logic level compatibility

• UL recognized (File #E90700)

• VDE recognized (ﬁle #102915), – add option V (e.g., MID400V)

APPLICATIONS

• Monitoring of the AC/DC “line-down” condition

• “Closed-loop” interface between electromechanical elements such as solenoids, relay contacts, small motors, and microprocessors

• Time delay isolation switch

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7/24/03

AC LINE MONITOR

LOGIC-OUT DEVICE

MID400

ABSOLUTE MAXIMUM RATINGS

Rating Value Unit

EMITTER

RMS Current 25 mA

DC Current ±30 mA

LED Power Dissipation @ T Derate above 70°C

DETECTOR

Low Level Output Current (I

High Level Output Voltage(V

Supply Voltage (V

Detector Power Dissipation @ T Derate above 70°C

TOTAL DEVICE

Storage Temperature -55 to +125 °C

Operating Temperature -40 to +85 °C

Lead Solder Temperature 260 for 10 sec °C

Total Device Power Dissipation @ T Derate above 70°C

Steady State Isolation 2500 VRMS

) 7.0 V

CC

= 25°C (P

A

)20mA

OL

) 7.0 V

OH

= 25°C (P

A

)

D

= 25°C (P

A

45

2.0

)

D

)

D

70

2.0

115 mW

4.0 mW/°C

mW

mW/°C

mW

mW/°C

Page 2 of 11

7/24/03

≤

AC LINE MONITOR

LOGIC-OUT DEVICE

MID400

ELECTRICAL CHARACTERISTICS

(0°C to 70°C Free Air Temperature unless otherwise speciﬁed-All typical values are at 25°C

INDIVIDUAL COMPONENT CHARACTERISTICS

Parameter Test Conditions Symbol Min Typ Max Unit

EMITTER

Input Forward Voltage (I

DETECTOR

Logic Low Output Supply Current

V

24 V [ V

Logic High Output

(I

= 0.15 mA RMS, V

IN

Supply Current

= ±30 mA, DC) V

F

(I

= 4.0 mA RMS,

IN

= Open, V

O

V

I (OFF)

I (ON)

CC

, RMS ≤ 240 V)

CC

, RMS ≥ 5.5 V)

= 5.5 V,

I

CCL

I

CCH

F

1.5 V

3.0 mA

0.80 mA

TRANSFER CHARACTERISTICS

DC Characteristics Test Conditions Symbol Min Typ Max Units

Logic Low Output Current

Logic High Output Current

On-state RMS Input Voltage

Off-state RMS Input Voltage

On-state RMS Input Current

Off-state RMS Input Current

(I

= I

IN

I (ON)

(I

= 0.15 mA RMS, V

IN

(V

= 0.4 V, I

O

RMS, I

24 V ≤ V

V

I

24 V ≤ V

(V

= V

O

= 16 mA, V

O

I (ON)

V

I (OFF)

(V

= 0.4 V, I

O

= 4.5 V, R

CC

100 µA, R

O

= 16 mA, V

O

I (ON)

= 5.5 V, I

CC

V

I (OFF)

= 4.5 V,

CC

, RMS ≤ 240 V)

= V

O

= 5.5 V,

CC

, RMS ≥ 5.5 V)

= 16 mA

O

= 22 K Ω )

IN

(V

= V

O

= 5.5 V,

CC

= 22 K Ω )

IN

= 4.5 V,

CC

, RMS ≤ 240 V)

100 µA,

O

, RMS ≥ 5.5 V)

V

OL

I

OH

V

RMS 90 V

I (ON)

V

RMS 5.5 V

I (OFF)

I

RMS 4.0 mA

I (ON)

I

RMS 0.15 mA

I (OFF)

0.18 0.40 V

0.02 100 µA

TRANSFER CHARACTERISTICS

Characteristics Test Conditions Symbol Min Typ Max Units

SWITCHING TIME (T

Tu r n-On Time

Tu r n-Off Time

(RMS = True RMS Voltage at 60 Hz, THD ≤ 1%)

= 25°C)

A

(I

= 4.0 mA RMS,

IN

I

= 16 mA, V

R

O

= 22 K Ω ) (See Test Circuit 2)

IN

(I

I

= 16 mA, V

R

O

= 22 K Ω ) (See Test Circuit 2)

IN

CC

= 4.0 mA RMS,

IN

CC

Page 3 of 11

= 4.5 V,

t

OFF

ON

1.0 ms

7/24/03

AC LINE MONITOR

LOGIC-OUT DEVICE

MID400

(T

ISOLATION CHARACTERISTICS

Characteristics Test Conditions Symbol Min Typ Max Units

= 25°C)

A

≤

Ω

Steady State Isolation Voltage

Isolation Resistance (V

Relative Humidity ≤ 50%, I

1 Minute, 60 Hz

I-O

Isolation Capacitance (f = 1 MHz) C

10 µA,

I-O

= 500 VDC) R

V

ISO

2500 VRMS

11

10

2pF

DESCRIPTION / APPLICATIONS

The input of the MID400 consists of two back-to-back LED diodes which will accept and convert alternating currents into light energy. An integrated photo diode-detector ampliﬁer forms the output network. Optical coupling between input and output provides 2500 VRMS voltage isolation. A very high current transfer ratio (deﬁned as the ratio of the DC output current and the DC input current) is achieved through the use of high gain ampliﬁer. The detector ampliﬁer circuitry operates from a 5 V DC supply and drives an open collector transistor output. The switching times are intentionally designed to be slow in order to enable the MID400, when used as an AC line monitor, to respond only to changes in input voltage exceeding many milliseconds. The short period of time during zero-crossing which occurs once every half cycle of the power line is completely ignored. To operate the MID400, always add a resistor, R resistor can be determined by the following equation:

Where V V

is the forward voltage drop across the LED.

F

I

(RMS) is the desired input current required to sustain a logic “O” on the output.

IN

(RMS) is the input voltage.

IN

, in series with the input (as shown in test circuit 1) to limit the current to the required value. The value of the

IN

VINVF–

R

-----------------------=

IN

I

IN

PIN DESCRIPTION

DESIGNATION PIN # FUNCTION

V

, V

IN1

IN2

V

CC

AUX. 7 Auxiliary terminal.

V

O

GND 5 Circuit ground potential.

1,3 Input terminals

8 Supply voltage, output circuit.

Programmable capacitor input to adjust AC voltage sensing level and time delay.

6 Output terminal; open collector.

Page 4 of 11

SCHEMATIC DIAGRAM

IN1

1

V

2

V

IN2

3

4

NOTE: DO NOT CONNECT PINS 2 AND 4

8

7

6

5

7/24/03

V

CC

AUX.

V

O

GND