MID400 AC Line Monitor Logic-Out Device
November 2006
MID400
AC Line Monitor Logic-Out Device
Features
■
Direct operation from any line voltage with the use of
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Description
The MID400 is an optically isolated AC line-to-logic inter-
face 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 iso-
lation, solid state reliability, TTL compatibility, small size,
low power, and low frequency operations are required.
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
Schematic
Package
1
8
V
CC
8
N/C
2
7
AUX
1
3
6
V
0
N/C
4
5
GND
8
1
8
1
Equivalent Circuit
©2005 Fairchild Semiconductor Corporation
1
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MID400 Rev. 1.0.1
MID400 AC Line Monitor Logic-Out Device
Absolute Maximum Ratings
Rating
EMITTER
RMS Current
DC Current
LED Power Dissipation @ T
A
= 25°C (P
D
)
Derate above 70°C
DETECTOR
Low Level Output Current (I
OL
)
High Level Output Voltage(V
OH
)
Supply Voltage (V
CC
)
Detector Power Dissipation @ T
A
= 25°C (P
D
)
Derate above 70°C
TOTAL DEVICE
Storage Temperature
Operating Temperature
Lead Solder Temperature
Total Device Power Dissipation @ T
A
= 25°C (P
D
)
Derate above 70°C
Steady State Isolation
-55 to +125
-40 to +85
260 for 10 sec
115
4.0
2500
°C
°C
°C
mW
mW/°C
VRMS
20
7.0
7.0
70
2.0
mA
V
V
mW
mW/°C
25
±30
45
2.0
mA
mA
mW
mW/°C
Value
Unit
2
MID400 Rev. 1.0.1
www.fairchildsemi.com
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
EMITTER
V
F
I
CCL
Input Forward Voltage
Logic Low Output Supply
Current
Logic High Output
Supply Current
I
F
= ±30 mA, DC
I
IN
= 4.0 mA RMS,
V
O
= Open, V
CC
= 5.5V, 24V V
I (ON)
,
RMS
≤
240V
I
IN
= 0.15mA RMS, V
CC
= 5.5V,
V
I (OFF)
, RMS
≥
5.5V
1.5
3.0
V
mA
DETECTOR
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
CCH
0.80
mA
Transfer Characteristics
Symbol
V
OL
I
OH
DC Characteristics
Logic Low Output
Current
Logic High Output
Current
Test Conditions
I
IN
= I
I (ON)
RMS, I
O
= 16mA, V
CC
= 4.5V,
24V
≤
V
I (ON)
, RMS
≤
240V
I
IN
= 0.15mA RMS, V
O
= V
CC
= 5.5V,
V
I (OFF)
, RMS
≥
5.5V
V
O
= 0.4V, I
O
= 16mA, V
CC
= 4.5V,
R
IN
= 22k
Ω
V
O
= V
CC
= 5.5 V, I
O
≤
100µA,
R
IN
= 22k
Ω
V
O
= 0.4V, I
O
= 16mA, V
CC
= 4.5V,
24V
≤
V
I (ON)
, RMS
≤
240V
V
O
= V
CC
= 5.5V, I
O
≤
100µA, V
I (OFF)
,
RMS
≥
5.5V
Min.
Typ.
0.18
0.02
Max.
0.40
100
Units
V
µA
V
V
I (ON)
RMS On-state RMS Input
Voltage
V
I (OFF)
RMS Off-state RMS Input
Voltage
I
I (ON)
RMS
On-state RMS
Input Current
90
5.5
4.0
0.15
V
mA
mA
I
I (OFF)
RMS Off-state RMS Input
Current
Transfer Characteristics
Symbol
t
ON
Characteristics
Turn-On Time
Test Conditions
I
IN
= 4.0mA RMS, I
O
= 16mA,
V
CC
= 4.5V, R
IN
= 22k
Ω
(See Test Circuit 2)
I
IN
= 4.0mA RMS, I
O
= 16mA,
V
CC
= 4.5V, R
IN
= 22k
Ω
(See Test Circuit 2)
Min.
Typ.
1.0
Max.
Units
ms
SWITCHING TIME
(T
A
= 25°C)
t
OFF
Turn-Off Time
1.0
ms
(RMS = True RMS Voltage at 60 Hz, THD
≤
1%)
Isolation Characteristics
(T
A
= 25°C)
Symbol
V
ISO
R
ISO
C
ISO
Characteristics
Steady State Isolation
Voltage
Isolation Resistance
Isolation Capacitance
Test Conditions
Relative Humidity
≤
50%,
I
I-O
≤
10µA, 1 Minute, 60Hz
V
I-O
= 500VDC
f = 1MHz
Min.
2500
10
11
Typ.
Max.
Units
VRMS
Ω
2
pF
3
MID400 Rev. 1.0.1
www.fairchildsemi.com
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 diode-
detector amplifier forms the output network. Optical cou-
pling 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 volt-
age 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
, 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 deter-
mined by the following equation:
V
IN
–
V
F
R
IN
= ---------------------
-
I
IN
Where,
V
IN
(RMS) is the input voltage.
V
F
is the forward voltage drop across the LED.
I
IN
(RMS) is the desired input current required to sustain a logic
“O” on the output.
Glossary
VOLTAGES
V
I (ON)
RMS
On-state RMS input voltage
The RMS voltage at an input terminal for a spec-
ified input current with output conditions applied
that according to the product specification will
cause the output switching element to be sus-
tained in the on-state within one full cycle.
V
I (OFF)
RMS
Off-state RMS input voltage
The RMS voltage at an input terminal for a spec-
ified input current with output conditions applied
that according to the product specification will
cause the output switching element to be sus-
tained in the off-state within one full cycle.
V
OL
Low-level output voltage
The voltage at an output terminal for a specific
output current I
OL
, with input conditions applied
that according to the product specification will
establish a low-level at the output.
V
OH
High-level output voltage
The voltage at an output terminal for a specific
output current I
OH
, with input conditions applied
that according to the product specification will
establish a high-level at the output.
V
F
LED forward voltage
The voltage developed across the LED when
input current I
F
is applied to the anode of the
LED.
Pin Description
Pin
Number
1,3
2, 4
8
7
CURRENTS
I
I (ON)
RMS
On-state RMS input current
The RMS current flowing into an input with out-
put 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.
I
I (OFF)
RMS
Off-state RMS input current
The RMS current flowing into an input with out-
put 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.
I
OH
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.
8 VCC
7 AUX.
6 VO
5 GND
* Current flowing out of a terminal is a negative value.
4
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Pin
Name
N/C
V
CC
AUX
Function
No Connect
Supply voltage, output circuit.
Auxiliary terminal.
Programmable capacitor input
to adjust AC voltage sensing
level and time delay.
Output terminal; open collector.
Circuit ground potential.
V
IN1
, V
IN2
Input terminals
6
5
V
O
GND
Schematic Diagram
VIN1 1
N/C
2
I
OL
Low-level output current
The current flowing into * an output with input
conditions applied that according to the product
specification will establish a low-level at the
output.
VIN2 3
N/C
4
MID400 Rev. 1.0.1
MID400 AC Line Monitor Logic-Out Device
I
CCL
Supply current, output low
The current flowing into * the V
CC
supply termi-
nal of a circuit when the output is at a low-level
voltage.
DYNAMIC CHARACTERISTICS
t
ON
Turn-on time
The time between the specified reference points
on the input and the output voltage waveforms
with the output changing from the defined high-
level to the defined low-level.
t
OFF
Turn-off time
The time between the specified reference points
on the input and the output voltage waveforms
with the output changing from the defined low-
level to the defined high-level.
* Current flowing out of a terminal is a negative value.
I
CCH
Supply current, output high
The current flowing into * the V
CC
supply termi-
nal of a circuit when the output is at a high-level
voltage.
5
MID400 Rev. 1.0.1
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