Fairchild MID400 service manual

MID400 — AC Line Monitor Logic-Out Device

April 2010

MID400 AC Line Monitor Logic-Out Device

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)

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

AC-to-DC control application where excellent optical isolation, solid state reliability, TTL compatibility, small size, low power, and low frequency operations are required.

. It is recommended for use in any

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

Schematic Package Outlines

N/C

4 5

AUX

GND

Equivalent Circuit

MID400 — AC Line Monitor Logic-Out Device

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.

Symbol Parameter Value Unit

TOTAL DEVICE

STG

OPR

SOL

Total Device Power Dissipation @ T

EMITTER

LED Power Dissipation @ T

DETECTOR

Storage Temperature -55 to +125 °C Operating Temperature -40 to +85 °C Lead Solder Temperature 260 for 10 sec °C

= 25°C 115 mW

Derate above 70°C 4.0 mW/°C Steady State Isolation 2500 VRMS

RMS Current 25 mA DC Current ±30 mA

= 25°C 45 mW

Derate above 70°C 2.0 mW/°C

Low Level Output Current 20 mA High Level Output Voltage 7.0 V Supply Voltage 7.0 V Detector Power Dissipation @ T

= 25°C 70 mW

Derate above 70°C 2.0 mW/°C

≤

Ω

MID400 — AC Line Monitor Logic-Out Device

Electrical Characteristics

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

Individual Component Characteristics

Symbol Parameter Test Conditions Min. Typ. Max. Unit

EMITTER

Input Forward Voltage I

= ±30 mA, DC 1.5 V

DETECTOR

CCL

Logic Low Output Supply Current

= 4.0 mA RMS,

= Open, V

= 5.5V, 24V V

I (ON)

3.0 mA

RMS ≤ 240V

CCH

Logic High Output Supply Current

= 0.15mA RMS, V

, RMS ≥ 5.5V

I (OFF)

= 5.5V,

0.80 mA

Transfer Characteristics

Symbol DC Characteristics Test Conditions Min. Typ. Max. Units

RMS On-state RMS Input

I (ON)

I (OFF)

RMS On-state RMS

I (ON)

RMS Off-state RMS Input

I (OFF)

Logic Low Output Current

Logic High Output Current

Voltage

RMS Off-state RMS Input

Voltage

Input Current

Current

= I

24V ≤ V I

= 0.15mA RMS, V

I (OFF)

= 0.4V, I

= V

= 0.4V, I

24V ≤ V V

= V

RMS, I

I (ON)

, RMS ≥ 5.5V

= 22k Ω

= 5.5 V, I

= 22k Ω

I (ON)

= 5.5V, I

, RMS ≤ 240V

= 16mA, V

, RMS ≤ 240V

RMS ≥ 5.5V

= 16mA, V

= V

100µA,

100µA, V

= 5.5V,

= 4.5V,

I (OFF)

= 4.5V,

0.18 0.40 V

0.02 100 µA

90 V

5.5 V

4.0 mA

0.15 mA

Transfer Characteristics

Symbol Characteristics Test Conditions Min. Typ. Max. Units

SWITCHING TIME (T

OFF

Tu r n-On Time I

Tu r n-Off Time I

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

Isolation Characteristics

= 25°C)

= 4.0mA RMS, I

= 4.5V, R

= 22k Ω

(See Test Circuit 2)

= 4.0mA RMS, I

= 4.5V, R

= 22k Ω

(See Test Circuit 2)

= 16mA,

1.0 ms

Symbol Characteristics Test Conditions Min. Typ. Max. Units

R C

Steady State Isolation

ISO

Voltage Isolation Resistance V

ISO

Isolation Capacitance f = 1MHz 2 pF

ISO

Relative Humidity ≤ 50%, I

10µA, 1 Minute, 60Hz

I-O

= 500VDC 10

I-O

2500 VRMS

MID400 — AC Line Monitor Logic-Out Device

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 diodedetector 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 5V 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

, in series with the

input (as shown in test circuit 1) to limit the current to the required value. The value of the resistor can be determined by the following equation:

VINVF–

-----------------------

Where,

(RMS) is the input voltage.

is the forward voltage drop across the LED.

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

Pin Description

Number

1, 3 V 2, 4 N/C No Connect

8V 7AUX Auxiliary terminal.

6VOOutput terminal; open collector. 5 GND Circuit ground potential.

Name Function

, V

IN1

Input terminals

IN2

Supply voltage, output circuit.

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

Schematic Diagram

N/C

IN1

IN2

AUX.

GND

Glossary

VOLTAGE S

RMS On-State RMS Input Voltage

I (ON)

The RMS voltage at an input terminal for a speciﬁed input current with output conditions applied that according to the product speciﬁcation will cause the output switching element to be sustained in the on-state within one full cycle.

RMS Off-State RMS Input Voltage

I (OFF)

CURRENTS

RMS On-State RMS Input Current

I (ON)

I (OFF)

*Current ﬂowing out of a terminal is a negative value.

Low-Level Output Voltage

The voltage at an output terminal for a speciﬁc output current IOL, with input conditions applied that according to the product speciﬁcation will establish a low-level at the output.

High-Level Output Voltage

The voltage at an output terminal for a speciﬁc output current IOH, with input conditions applied that according to the product speciﬁcation will establish a high-level at the output.

LED Forward Voltage

The voltage developed across the LED when input current IF is applied to the anode of the LED.

The RMS current ﬂowing into an input with output conditions applied that according to the product speciﬁcation will cause the output switching element to be sustained in the on-state within one full cycle.

RMS Off-state RMS Input Current

The RMS current ﬂowing into an input with output conditions applied that according to the product speciﬁcation will cause the output switching element to be sustained in the off-state within one full cycle.

High-Level Output Current

The current ﬂowing into * an output with input conditions applied that according to the product speciﬁcation will establish a high-level at the output.

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