MC33161 [ONSEMI]
Universal Voltage Monitors; 通用电压监测器
| 型号： | MC33161 |
| 厂家： | 
ONSEMI |
| 描述： | Universal Voltage Monitors |
| 文件： | 总16页 (文件大小：367K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
The MC34161/MC33161 are universal voltage monitors intended
for use in a wide variety of voltage sensing applications. These devices
offer the circuit designer an economical solution for positive and
negative voltage detection. The circuit consists of two comparator
channels each with hysteresis, a unique Mode Select Input for channel
programming, a pinned out 2.54 V reference, and two open collector
outputs capable of sinking in excess of 10 mA. Each comparator
channel can be configured as either inverting or noninverting by the
Mode Select Input. This allows over, under, and window detection of
positive and negative voltages. The minimum supply voltage needed
for these devices to be fully functional is 2.0 V for positive voltage
sensing and 4.0 V for negative voltage sensing.
Applications include direct monitoring of positive and negative
voltages used in appliance, automotive, consumer, and industrial
equipment.
• Unique Mode Select Input Allows Channel Programming
• Over, Under, and Window Voltage Detection
• Positive and Negative Voltage Detection
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MARKING
DIAGRAMS
8
PDIP–8
P SUFFIX
CASE 626
MC3x161P
AWL
YYWW
8
1
1
8
1
3x161
ALYW
SO–8
D SUFFIX
CASE 751
8
1
• Fully Functional at 2.0 V for Positive Voltage Sensing and 4.0 V for
Negative Voltage Sensing
x
A
= 3 or 4
= Assembly Location
• Pinned Out 2.54 V Reference with Current Limit Protection
• Low Standby Current
• Open Collector Outputs for Enhanced Device Flexibility
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
V
1
2
3
4
8
7
6
5
V
CC
Simplified Block Diagram
(Positive Voltage Window Detector Application)
ref
Input 1
Input 2
Gnd
Mode Select
Output 1
V
CC
Output 2
8
(TOP VIEW)
1
7
2
2.54V
Reference
V
S
ORDERING INFORMATION
–
+
Device
Package
SO–8
Shipping
98 Units/Rail
2500 Tape & Reel
50 Units/Rail
98 Units/Rail
6
5
+
2.8V
+
MC34161D
MC34161DR2
MC34161P
MC33161D
–
+
+
SO–8
1.27V
–
PDIP–8
SO–8
+
+
3
0.6V
+
–
MC33161DR2
MC33161P
SO–8
2500 Tape & Reel
50 Units/Rail
1.27V
PDIP–8
4
Semiconductor Components Industries, LLC, 2000
1
Publication Order Number:
April, 2000 – Rev. 2
MC34161/D
MC34161, MC33161
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
V
Power Supply Input Voltage
V
CC
40
– 1.0 to +40
20
Comparator Input Voltage Range
V
in
V
Comparator Output Sink Current (Pins 5 and 6) (Note 1.)
Comparator Output Voltage
I
mA
V
Sink
V
out
40
Power Dissipation and Thermal Characteristics (Note 1.)
P Suffix, Plastic Package, Case 626
Maximum Power Dissipation @ T = 70°C
Thermal Resistance, Junction–to–Air
D Suffix, Plastic Package, Case 751
P
800
100
mW
°C/W
A
D
R
θJA
Maximum Power Dissipation @ T = 70°C
Thermal Resistance, Junction–to–Air
P
450
178
mW
°C/W
A
D
R
θJA
Operating Junction Temperature
T
+150
°C
°C
J
Operating Ambient Temperature (Note 3.)
MC34161
MC33161
T
A
0 to +70
– 40 to +85
Storage Temperature Range
T
stg
– 55 to +150
°C
ELECTRICAL CHARACTERISTICS (V
CC
= 5.0 V, for typical values T = 25°C, for min/max values T is the operating ambient
A A
temperature range that applies [Notes 2. and 3.], unless otherwise noted.)
Characteristics
Symbol
Min
Typ
Max
Unit
COMPARATOR INPUTS
Threshold Voltage, V Increasing (T = 25°C)
V
th
1.245
1.235
1.27
–
1.295
1.295
V
in
A
Threshold Voltage, V Increasing (T = T
to T
)
max
in
A
min
Threshold Voltage Variation (V
= 2.0 V to 40 V)
∆V
th
–
15
–
7.0
25
15
35
mV
mV
mV
V
CC
Threshold Hysteresis, V Decreasing
in
V
H
Threshold Difference |V
– V
|
V
D
1.0
1.27
15
th1
th2
Reference to Threshold Difference (V – V ), (V – V
)
V
RTD
1.20
1.32
ref in1 ref in2
Input Bias Current (V = 1.0 V)
Input Bias Current (V = 1.5 V)
in
I
IB
–
–
40
85
200
400
nA
in
MODE SELECT INPUT
Mode Select Threshold Voltage (Figure 5) Channel 1
Mode Select Threshold Voltage (Figure 5) Channel 2
V
V
V
+0.15
0.3
V
+0.23
0.63
V
+0.30
0.9
V
th(CH 1)
th(CH 2)
ref
ref
ref
COMPARATOR OUTPUTS
Output Sink Saturation Voltage (I
Output Sink Saturation Voltage (I
Output Sink Saturation Voltage (I
= 2.0 mA)
= 10 mA)
= 0.25 mA, V
V
OL
–
–
–
0.05
0.22
0.02
0.3
0.6
0.2
V
Sink
Sink
Sink
= 1.0 V)
CC
Off–State Leakage Current (V
= 40 V)
I
–
0
1.0
µA
OH
OH
REFERENCE OUTPUT
Output Voltage (I = 0 mA, T = 25°C)
V
2.48
–
2.54
0.6
5.0
–
2.60
15
V
O
A
ref
Reg
Load Regulation (I = 0 mA to 2.0 mA)
mV
mV
V
O
load
Line Regulation (V
CC
= 4.0 V to 40 V)
Reg
–
15
line
Total Output Variation over Line, Load, and Temperature
Short Circuit Current
∆V
2.45
–
2.60
30
ref
I
8.5
mA
SC
TOTAL DEVICE
Power Supply Current (V
Power Supply Current (V
, V , V
= Gnd) (V
= 5.0 V)
= 40 V)
I
CC
–
–
450
560
700
900
µA
Mode in1 in2
CC
CC
, V 1, V 2 = Gd) (V
Mode in in
Operating Voltage Range (Positive Sensing)
Operating Voltage Range (Negative Sensing)
V
CC
2.0
4.0
–
–
40
40
V
1. Maximum package power dissipation must be observed.
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
3. T
=
0°C for MC34161
–40°C for MC33161
T
high
=
+70°C for MC34161
+85°C for MC33161
low
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2
MC34161, MC33161
6.0
5.0
4.0
3.0
2.0
1.0
0
500
400
300
200
V
= 5.0 V
CC
R = 10 k to V
L
CC
V
= 5.0 V
= Gnd
CC
T
A = 25°C
V
Mode
T = 25°C
A
T = 85°C
A
T = 85°C
A
T = 25°C
A
T = 25°C
100
0
A
T = –40°C
A
T = –40°C
A
1.22
1.23
1.24
1.25
1.26
1.27
1.28
1.29
0
1.0
2.0
3.0
4.0
5.0
V , INPUT VOLTAGE (V)
in
V , INPUT VOLTAGE (V)
in
Figure 1. Comparator Input Threshold Voltage
Figure 2. Comparator Input Bias Current
versus Input Voltage
3600
3000
2400
8.0
V
= 5.0 V
Undervoltage Detector
Programmed to trip at 4.5 V
R = 1.8 k, R = 4.7 k
CC
1. V
Mode
= Gnd, Output Falling
= V , Output Rising
= V , Output Falling
T = 25°C
A
2. V
Mode CC
3. V
4. V
1
2
Mode CC
Mode
6.0
4.0
2.0
0
R = 10 k to V
= Gnd, Output Rising
L
CC
Refer to Figure 16
1800
1200
600
1
2
T = –40°C
A
3
T = –25°C
A
T = –85°C
4
A
0
2.0
4.0
6.0
8.0
10
0
2.0
4.0
V , SUPPLY VOLTAGE (V)
CC
6.0
8.0
PERCENT OVERDRIVE (%)
Figure 3. Output Propagation Delay Time
versus Percent Overdrive
Figure 4. Output Voltage versus Supply Voltage
6.0
5.0
4.0
3.0
2.0
1.0
40
35
30
25
20
15
10
V
A
= 5.0 V
Channel 2 Threshold
Channel 1 Threshold
CC
T = 25°C
V
L
= 5.0 V
CC
R = 10 k to V
CC
T = 85°C
A
T = 85°C
A
T = 25°C
T = –40°C
A
A
T = 25°C
A
T = –40°C
A
5.0
0
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
1.0
2.0
3.0
4.0
5.0
V
Mode
, MODE SELECT INPUT VOLTAGE (V)
V
Mode
, MODE SELECT INPUT VOLTAGE (V)
Figure 5. Mode Select Thresholds
Figure 6. Mode Select Input Current
versus Input Voltage
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3
MC34161, MC33161
2.8
2.610
2.578
2.546
2.514
V
ref
Max = 2.60 V
2.4
2.0
1.6
1.2
0.8
V
ref
Typ = 2.54 V
V
V
Mode
= 5.0 V
= Gnd
CC
2.482
2.450
V
= Gnd
Mode
0.4
0
T = 25°C
A
V
ref
Min = 2.48 V
0
10
20
, SUPPLY VOLTAGE (V)
30
40
–55
–25
0
25
50
75
100
125
V
CC
T , AMBIENT TEMPERATURE (°C)
A
Figure 7. Reference Voltage
versus Supply Voltage
Figure 8. Reference Voltage
versus Ambient Temperature
0
–2.0
–4.0
–6.0
0.5
0.4
0.3
V
V
Mode
= 5.0 V
= Gnd
CC
T = 85°C
A
T = 25°C
A
V
V
Mode
= 5.0 V
= Gnd
CC
0.2
0.1
0
T = –40°C
A
–8.0
–10
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0
4.0
8.0
12
16
I , REFERENCE SOURCE CURRENT (mA)
ref
I , OUTPUT SINK CURRENT (mA)
out
Figure 9. Reference Voltage Change
versus Source Current
Figure 10. Output Saturation Voltage
versus Output Sink Current
1.6
0.8
V
= V
Mode CC
Pins 2, 3 = Gnd
V
= Gnd
Mode
Pins 2, 3 = 1.5 V
0.6
0.4
1.2
0.8
V
= V
Mode ref
Pin 1 = 1.5 V
Pin 2 = Gnd
V
= 5.0 V
= Gnd
CC
0.2
0
V
0.4
0
Mode
I
measured at Pin 8
CC
A
T = 25°C
A
T = 25°C
0
10
20
, SUPPLY VOLTAGE (V)
30
40
0
4.0
I
out
8.0
12
16
V
CC
, OUTPUT SINK CURRENT (mA)
Figure 11. Supply Current versus
Supply Voltage
Figure 12. Supply Current
versus Output Sink Current
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4
MC34161, MC33161
V
CC
8
2.54V
Reference
V
ref
1
Channel 1
Channel 2
Mode Select
Input 1
–
7
2
+
+
Output 1
Output 2
2.8V
+
6
5
–
+
+
1.27V
–
+
+
0.6V
Input 2
+
3
–
1.27V
4
Gnd
Figure 13. MC34161 Representative Block Diagram
Mode Select
Pin 7
Input 1
Pin 2
Output 1
Pin 6
Input 2
Pin 3
Output 2
Pin 5
Comments
GND
0
1
0
1
0
1
0
1
Channels 1 & 2: Noninverting
V
ref
0
1
0
1
0
1
1
0
Channel 1: Noninverting
Channel 2: Inverting
V
CC
(>2.0 V)
0
1
1
0
0
1
1
0
Channels 1 & 2: Inverting
Figure 14. Truth Table
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MC34161, MC33161
FUNCTIONAL DESCRIPTION
Reference
Introduction
Tobecompetitiveintoday’selectronicequipmentmarket,
new circuits must be designed to increase system reliability
with minimal incremental cost. The circuit designer can take
a significant step toward attaining these goals by
implementing economical circuitry that continuously
monitors critical circuit voltages and provides a fault signal
in the event of an out–of–tolerance condition. The
MC34161, MC33161 series are universal voltage monitors
intended for use in a wide variety of voltage sensing
applications. The main objectives of this series was to
configure a device that can be used in as many voltage
sensing applications as possible while minimizing cost. The
flexibilityobjectiveisachievedbytheutilizationofaunique
Mode Select input that is used in conjunction with
traditional circuit building blocks. The cost objective is
achieved by processing the device on a standard Bipolar
Analog flow, and by limiting the package to eight pins. The
device consists of two comparator channels each with
hysteresis, a mode select input for channel programming, a
pinned out reference, and two open collector outputs. Each
comparator channel can be configured as either inverting or
noninverting by the Mode Select input. This allows a single
device to perform over, under, and window detection of
positive and negative voltages. A detailed description of
each section of the device is given below with the
representative block diagram shown in Figure 13.
The 2.54 V reference is pinned out to provide a means for
the input comparators to sense negative voltages, as well as
a means to program the Mode Select input for window
detection applications. The reference is capable of sourcing
in excess of 2.0 mA output current and has built–in short
circuit protection. The output voltage has a guaranteed
tolerance of ±2.4% at room temperature.
The 2.54 V reference is derived by gaining up the internal
1.27 V reference by a factor of two. With a power supply
voltage of 4.0 V, the 2.54 V reference is in full regulation,
allowing the device to accurately sense negative voltages.
Mode Select Circuit
The key feature that allows this device to be flexible is the
Mode Select input. This input allows the user to program
each of the channels for various types of voltage sensing
applications. Figure 14 shows that the Mode Select inputhas
three defined states. These states determine whether
Channel 1 and/or Channel 2 operate in the inverting or
noninverting mode. The Mode Select thresholds are shown
in Figure 5. The input circuitry forms a tristate switch with
thresholdsat0.63 VandV +0.23V.Themodeselectinput
ref
current is 10µAwhenconnectedtothereferenceoutput, and
42 µA when connected to a V
of 5.0 V, refer to Figure 6.
CC
Output Stage
The output stage uses a positive feedback base boost
circuit for enhanced sink saturation, while maintaining a
relatively low device standby current. Figure 10 shows that
the sink saturation voltage is about 0.2 V at 8.0 mA over
temperature. By combining the low output saturation
characteristics with low voltage comparator operation, this
Input Comparators
The input comparators of each channel are identical, each
having an upper threshold voltage of 1.27 V ±2.0% with
25 mV of hysteresis. The hysteresis is provided to enhance
output switching by preventing oscillations as the
comparatorthresholdsarecrossed. Thecomparatorshavean
input bias current of 60 nA at their threshold which
approximates a 21.2 MΩ resistor to ground. This high
impedance minimizes loading of the external voltage
divider for well defined trip points. For all positive voltage
sensing applications, both comparator channels are fully
device is capable of sensing positive voltages at a V
of
CC
1.0 V. These characteristics are important in undervoltage
sensing applications where the output must stay in a low
state as V approaches ground. Figure 4 shows the Output
CC
Voltage versus Supply Voltage in an undervoltage sensing
application. Note that as V
drops below the programmed
CC
4.5 V trip point, the output stays in a well defined active low
state until V drops below 1.0 V.
functional at a V
of 2.0 V. In order to provide enhanced
CC
CC
device ruggedness for hostile industrial environments,
additional circuitry was designed into the inputs to prevent
device latch–up as well as to suppress electrostatic
discharges (ESD).
APPLICATIONS
The following circuit figures illustrate the flexibility of
this device. Included are voltage sensing applications for
over, under, and window detectors, as well as three unique
configurations. Many of the voltage detection circuits are
shown with the open collector outputs of each channel
connected together driving a light emitting diode (LED).
This ‘ORed’ connection is shown for ease of explanation
and it is only required for window detection applications.
Note that many of the voltage detection circuits are shown
with a dashed line output connection. This connection gives
the inverse function of the solid line connection. For
example, the solid line output connection of Figure 15 has
the LED ‘ON’ when input voltage V is above trip voltage
S
V , for overvoltage detection. The dashed line output
2
connectionhas the LED ‘ON’ when V is below trip voltage
S
V , for undervoltage detection.
2
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6
MC34161, MC33161
V
CC
8
V
2
2.54V
Reference
Input V
V
S
Hys
1
7
2
V
V
1
S1
–
+
2.8V
+
+
R
2
Gnd
+
–
6
5
Output
Voltage
Pins 5, 6
V
CC
V
S2
+
+
R
1
1.27V
–
+
LED ‘ON’
Gnd
R
2
0.6V
+
–
3
R
1
1.27V
4
The above figure shows the MC34161 configured as a dual positive overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when
or V exceeds V . With the dashed line output connection, the circuit becomes a dual positive undervoltage detector. As the input voltage decreases from
V
S1
S2
2
the peak towards ground, the LED will turn ‘ON’ when V or V falls below V .
S1
S2
1
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
R
R
R
R
R
R
V
R
R
V
V
2
1
2
1
2
1
1
2
1
2
V
(V
V )
1
V
V
th
1
1
1
1
th
H
2
V
V
H
th
th
Figure 15. Dual Positive Overvoltage Detector
V
CC
8
2.54V
Reference
V
2
1
Input V
S
V
Hys
V
S1
V
–
+
2.8V
1
7
2
+
+
R
2
+
–
6
5
Gnd
+
+
V
S2
R
1
Output
Voltage
Pins 5, 6
V
1.27V
CC
–
+
0.6V
LED ‘ON’
R
2
Gnd
+
–
3
R
1
1.27V
4
The above figure shows the MC34161 configured as a dual positive undervoltage detector. As the input voltage decreases towards ground, the LED will turn ‘ON’
when V or V falls below V . With the dashed line output connection, the circuit becomes a dual positive overvoltage detector. As the input voltage increases
S1
S2
1
from ground, the LED will turn ‘ON’ when V or V exceeds V .
S1 S2
2
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
R
R
V
R
R
V
V
R
R
R
R
2
1
1
2
1
2
2
1
2
1
1
1
V
(V
V )
1
V
V
th
1
1
th
H
2
V
V
H
th
th
Figure 16. Dual Positive Undervoltage Detector
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7
MC34161, MC33161
V
CC
8
2.54V
Reference
Gnd
1
7
2
R
2
–
V
1
+
2.8V
+
+
R1
Input –V
V
+
–
S
Hys
6
5
–V
S1
+
+
V
2
1.27V
–
+
R
2
R1
Output
Voltage
Pins 5, 6
V
CC
0.6V
+
–
–V
S2
LED ‘ON’
Gnd
3
1.27V
4
Theabove figure shows the MC34161 configured as a dual negative overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when
–V or–V exceedsV . Withthedashedlineoutputconnection, thecircuitbecomesadualnegativeundervoltagedetector. Astheinputvoltagedecreasesfrom
S1
S2
2
the peak towards ground, the LED will turn ‘ON’ when –V or –V falls below V .
S1
S2
1
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
V
V
V
V
V
V
V
V
R
R
R
R
R
R
R
R
1
th
2
th
H
H
1
2
1
2
1
2
1
2
V
(V
V
)
V
V
(V
V
V
)
ref
V
V
H
1
th
th
2
th
H
th
ref
V
V
th
th
ref
ref
Figure 17. Dual Negative Overvoltage Detector
V
CC
8
2.54V
Reference
1
R
2
Gnd
–
+
2.8V
7
2
+
+
R1
V
1
+
–
6
5
–V
S1
V
+
+
Hys
Input –V
S
1.27V
V
–
+
0.6V
2
R
R1
2
Output
Voltage
Pins 5, 6
V
CC
–V
S2
+
–
3
LED ‘ON’
1.27V
Gnd
4
The above figure shows the MC34161 configured as a dual negative undervoltage detector. As the input voltage decreases towards ground, the LED will turn ‘ON’
when–V or–V fallsbelowV .Withthedashedlineoutputconnection,thecircuitbecomesadualnegativeovervoltagedetector.Astheinputvoltageincreases
S1
S2
1
from ground, the LED will turn ‘ON’ when –V or –V exceeds V .
S1
S2
2
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
V
V
V
V
V
V
V
V
R
R
R
R
R
R
R
R
1
th
2
th
H
H
1
2
1
2
1
2
1
2
V
(V
V
)
V
V
(V
V
V
)
ref
V
V
H
1
th
th
2
th
H
th
ref
V
V
th
th
ref
ref
Figure 18. Dual Negative Undervoltage Detector
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8
MC34161, MC33161
V
CC
8
2.54V
Reference
V
4
CH2
CH1
V
Hys2
V
1
7
2
V
3
S
Input V
S
–
V
2
V
Hys1
+
R
+
V
1
3
2.8V
+
–
6
5
+
+
Gnd
1.27V
R
–
2
V
Output
Voltage
Pins 5, 6
+
+
CC
‘ON’
LED ‘OFF’
LED ‘ON’ ‘OFF’
LED ‘ON’
0.6V
+
–
3
Gnd
R
1
1.27V
4
TheabovefigureshowstheMC34161configuredasapositivevoltagewindowdetector.Thisisaccomplishedbyconnectingchannel1asanundervoltagedetector,
and channel 2 as an overvoltage detector. When the input voltage V falls out of the window established by V and V , the LED will turn ‘ON’. As the input voltage
S
2
1
4
fallswithinthewindow, V increasingfromgroundandexceedingV , or V decreasingfromthepeaktowardsgroundandfallingbelowV , the LED will turn ‘OFF’.
S
S
3
With the dashed line output connection, the LED will turn ‘ON’ when the input voltage V is within the window.
S
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
R
3
R
R
V (V
3
V (V
1
V
V
)
)
R
R
V (V
V
V
)
H1
R
R
2
3
th2
th1
H2
H1
3
1
3
1
th1
2
1
V
V
(V
V
)
1
V
V
(V
V )
H2
1
1
1
2
th1
H1
3
4
th2
R
R
R
1
V (V
V
)
H2
1
2
1
1
th2
R
R
R
V
V
x V
x V
R
R
V (V
V
)
R
R
3
2
3
4
2
th2
3
1
4
2
th1
2
1
V
1
V
1
th1
th2
R
R
R
V
x V
2
th2
1
2
1
th1
Figure 19. Positive Voltage Window Detector
V
CC
8
2.54V
Reference
1
Gnd
–
+
2.8V
V
1
CH2
CH1
V
Hys2
7
2
+
+
R
3
V
2
Input –V
+
–
S
6
5
V
3
V
4
+
+
V
Hys1
1.27V
R
2
–
+
0.6V
V
Output
Voltage
Pins 5, 6
CC
+
–
‘ON’
LED ‘OFF’
LED ‘ON’
‘OFF’
LED ‘ON’
3
R
1
Gnd
1.27V
–V
S
4
The above figure shows the MC34161 configured as a negative voltage window detector. When the input voltage –V falls out of the window established by V
S
1
andV , theLEDwillturn‘ON’. Astheinputvoltagefallswithinthewindow, –V increasingfromgroundandexceedingV , or–V decreasingfromthepeaktowards
4
S
2
S
groundand falling below V , the LED will turn ‘OFF’. With the dashedlineoutputconnection, theLEDwillturn‘ON’whentheinputvoltage–V is within the window.
3
S
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
R (V
1
V
)
V
V
th2
R
R
R
R
th2
2
ref
1
1
1
3
3
V
V
V
V
V
1
2
3
4
th2
)
R
R
R
R
R
R
R
R
R
R
V
V
3
2
2
1
1
3
3
2
2
th2
ref
R (V
1
V
V
V
V
V
H2
th2
R
H2
R
ref
2
th2
V
V
V
th2
H2
V
V
V
2
3
th2
H2
ref
(R
1
R )(V
2
V
V
)
V
V
th1
ref
th1
ref
V
th1
)
R
V
V
th1
3
3
(R
1
R )(V
V
V
V
V
2
th1
R
H1
th1
H1
ref
ref
V
th1
H1
V
V
V
th1
3
4
H1
Figure 20. Negative Voltage Window Detector
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9
MC34161, MC33161
V
CC
8
V
4
2.54V
Reference
Input V
S2
V
Hys2
V
3
1
7
2
–
Gnd
+
2.8V
+
+
R
4
–V
S1
+
–
V
1
V
2
6
5
V
Hys1
R
3
Input –V
S1
+
+
1.27V
–
+
Output
Voltage
Pins 5, 6
V
CC
R2
LED ‘ON’
0.6V
+
–
V
S2
3
Gnd
R
1
1.27V
4
The above figure shows the MC34161 configured as a positive and negative overvoltage detector. As the input voltage increases from ground, the LED will turn
‘ON’wheneither–V exceedsV , orV exceedsV .Withthedashedlineoutputconnection,thecircuitbecomesapositiveandnegativeundervoltagedetector.
S1
2
S2
4
As the input voltage decreases from the peak towards ground, the LED will turn ‘ON’ when either V falls below V , or –V falls below V .
S2 S1
3
1
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
R
R
(V
V
)
th1
R
3
R
R
R
R
V
4
3
4
1
2
1
2
1
V
V
(V
(V
V
V
)
V
V
V
(V
V
V
)
1
1
1
2
th1
th1
th1
ref
3
4
th2
H2
(V
(V
V
)
R
V
th1
ref
4
th2
R
R
(V
V
V
)
H1
R
R
V
3
R
R
R
R
3
4
2
th1
3
4
2
2
1
V
)
V
V
1
1
H1
ref
th1
H1
th2
V
V
)
V
V
th1
H1
ref
1
th2
H2
Figure 21. Positive and Negative Overvoltage Detector
V
CC
8
V
V
1
2
2.54V
Reference
V
Input V
S1
Hys1
1
7
–
Gnd
+
2.8V
+
+
R
4
V
3
+
–
6
Input –V
S2
V
2
V
Hys2
+
+
S1
R
3
1.27V
V
4
–
+
R
2
0.6V
V
CC
Output
Voltage
Pins 5, 6
+
–
5
LED ‘ON’
3
R
1
1.27V
Gnd
–V
S2
4
The above figure shows the MC34161 configured as a positive and negative undervoltage detector. As the input voltage decreases toward ground, the LED will
turn ‘ON’ when either V falls below V , or –V falls below V . With the dashed line output connection, the circuit becomes a positive and negative overvoltage
S1
1
S2
3
detector. As the input voltage increases from the ground, the LED will turn ‘ON’ when either V exceeds V , or –V exceeds V .
S1 S1
2
1
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
V
V
V
th2
R
R
R
R
R
R
V
R
R
4
H2
4
3
1
2
4
3
2
1
2
V
V
(V
V
)
1
V
V
(V
(V
V
V
)
V
1
1
2
th1
H1
3
4
th
th
ref
th2
)
V
V
V
V
V
H2
V
th1
th2
ref
V
V
th2
V
R
R
R
R
R
R
V
R
R
3
4
1
2
4
3
1
1
2
V
1
V
V
V
H2
1
th1
H2
ref
th2
V
3
th1
H1
th2
ref
Figure 22. Positive and Negative Undervoltage Detector
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10
MC34161, MC33161
V
CC
8
R
A
2.54V
Reference
V
2
Piezo
1
7
2
V
Hys
Input V
V
S
S
V
1
–
+
2.8V
R
+
+
2
+
–
Gnd
6
5
+
+
R
1
Output
Voltage
Pins 5, 6
V
CC
1.27V
–
+
Osc ‘ON’
Gnd
0.6V
+
–
3
1.27V
4
R
B
C
T
TheabovefigureshowstheMC34161configuredasanovervoltagedetectorwithanaudioalarm.Channel1monitorsinputvoltageV whilechannel2isconnected
S
as a simple RC oscillator. As the input voltage increases from ground, the output of channel 1 allows the oscillator to turn ‘ON’ when V exceeds V .
S
2
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
R
R
R
R
R
R
V
R
R
V
V
2
1
2
1
2
1
1
2
1
2
V
(V
V )
1
V
V
th
1
1
1
1
th
H
2
V
V
H
th
th
Figure 23. Overvoltage Detector with Audio Alarm
V
CC
8
2.54V
Reference
1
V
V
1
2
Input V
V
S
Hys
R
3
–
7
+
2.8V
+
+
Gnd
+
–
6
5
2
V
+
+
S
Output
Voltage
Pin 5
V
CC
1.27V
–
+
R
DLY
Gnd
R
2
0.6V
+
–
t
DLY
3
R
Output
Voltage
Pin 6
V
CC
1
1.27V
Reset LED ‘ON’
Gnd
4
C
DLY
The above figure shows the MC34161 configured as a microprocessor reset with a time delay. Channel 2 monitors input voltage V while channel 1 performs the
S
timedelay function. As the input voltage decreases towards ground, the output of channel 2 quickly discharges C
when V falls below V . As the input voltage
S 1
DLY
increases from ground, the output of channel 2 allows R
to charge C when V exceeds V .
DLY
DLY S 2
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
R
R
R
R
R
R
V
R
R
V
V
2
1
2
1
2
1
1
2
1
2
V
(V
V )
H
1
V
V
th
1
1
1
1
th
2
V
V
H
th
th
1
V
For known R
C
values, the reset time delay is:
t
= R
C
In
DLY DLY
DLY
DLY DLY
th
1 –
V
CC
Figure 24. Microprocessor Reset with Time Delay
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11
MC34161, MC33161
B+
+
+
220
250V
75k
75k
MAC
228A6FP
MR506
T
Input
92 Vac to
276 Vac
8
220
250V
10k
3.0A
2.54V
RTN
Reference
1.2k
1
10k
–
7
2
+
+
+
2.8V
+
–
6
5
+
+
1.27V
100k
–
+
0.6V
1.6M
+
–
3
1.27V
+
10
+
1N
4742
47
4
10k
3W
The above circuit shows the MC34161 configured as an automatic line voltage selector. The IC controls the triac, enabling the circuit to function
as a fullwave voltage doubler or a fullwave bridge. Channel 1 senses the negative half cycles of the AC line voltage. If the line voltage is less
than150 V, the circuit will switch from bridge mode to voltage doubling mode after a preset time delay. The delay is controlled by the 100 kΩ resistor
and the 10 µF capacitor. If the line voltage is greater than 150 V, the circuit will immediately return to fullwave bridge mode.
Figure 25. Automatic AC Line Voltage Selector
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12
MC34161, MC33161
470µH
MPS750
V
in
12V
V
O
+
5.0V/250mA
+
8
330
1000
1N5819
470
2.54V
Reference
1.8k
0.01
1
7
2
–
+
+
+
0.01
4.7k
1.6k
2.8V
+
–
6
5
+
+
1.27V
–
+
0.6V
+
–
3
1.27V
47k
4
0.005
Figure 26. Step–Down Converter
Test
Conditions
Results
40 mV = ±0.1%
Line Regulation
Load Regulation
Output Ripple
Efficiency
V
in
V
in
V
in
V
in
= 9.5 V to 24 V, I = 250 mA
O
= 12 V, I = 0.25 mA to 250 mA
2.0 mV = ±0.2%
50 mVpp
O
= 12 V, I = 250 mA
O
= 12 V, I = 250 mA
87.8%
O
The above figure shows the MC34161 configured as a step–down converter. Channel 1 monitors the output voltage while Channel
2 performs the oscillator function. Upon initial power–up, the converters output voltage will be below nominal, and the output of
Channel 1 will allow the oscillator to run. The external switch transistor will eventually pump–up the output capacitor until its voltage
exceeds the input threshold of Channel 1. The output of Channel 1 will then switch low and disable the oscillator. The oscillator will
commence operation when the output voltage falls below the lower threshold of Channel 1.
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13
MC34161, MC33161
PACKAGE DIMENSIONS
PDIP
P SUFFIX
CASE 626–05
ISSUE K
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
8
5
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
–B–
MILLIMETERS
DIM MIN MAX
9.40 10.16 0.370 0.400
INCHES
MIN MAX
1
4
A
B
C
D
F
6.10
3.94
0.38
1.02
6.60 0.240 0.260
4.45 0.155 0.175
0.51 0.015 0.020
1.78 0.040 0.070
F
–A–
NOTE 2
L
G
H
J
K
L
2.54 BSC
0.100 BSC
1.27 0.030 0.050
0.30 0.008 0.012
0.76
0.20
2.92
3.43
0.115
0.135
C
7.62 BSC
0.300 BSC
M
N
–––
0.76
10
–––
10
1.01 0.030 0.040
J
–T–
SEATING
PLANE
N
M
D
K
G
H
M
M
M
0.13 (0.005)
T A
B
SO–8
D SUFFIX
CASE 751–06
ISSUE T
NOTES:
D
A
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
C
2. DIMENSIONS ARE IN MILLIMETER.
3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
8
1
5
4
M
M
0.25
B
H
E
h X 45
MILLIMETERS
B
e
DIM MIN
MAX
1.75
0.25
0.49
0.25
5.00
4.00
A
A1
B
C
D
E
1.35
0.10
0.35
0.19
4.80
3.80
A
C
SEATING
PLANE
L
e
1.27 BSC
0.10
H
h
L
5.80
0.25
0.40
0
6.20
0.50
1.25
7
A1
B
M
S
S
0.25
C B
A
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14
MC34161, MC33161
Notes
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15
MC34161, MC33161
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
withoutfurthernoticetoanyproductsherein. SCILLCmakesnowarranty,representationorguaranteeregardingthesuitabilityofitsproductsforanyparticular
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MC34161/D
相关型号：
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