MC34161, MC33161, NCV33161 Universal Voltage Monitors 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. http://onsemi.com MARKING DIAGRAMS 8 1 1 8 SOIC−8 D SUFFIX CASE 751 Features • • • • • • • • • Unique Mode Select Input Allows Channel Programming Over, Under, and Window Voltage Detection Positive and Negative Voltage Detection Fully Functional at 2.0 V for Positive Voltage Sensing and 4.0 V for Negative Voltage Sensing Pinned Out 2.54 V Reference with Current Limit Protection Low Standby Current Open Collector Outputs for Enhanced Device Flexibility NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes Pb−Free Packages are Available VCC 8 1 VS 2.54V Reference − + + 6 − 1.27V + 1 8 Micro8t DM SUFFIX CASE 846A x161 AYW G G 1 1 x = 3 or 4 A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week G or G = Pb−Free Package (Note: Microdot may be in either location) Vref 1 8 VCC Input 1 2 7 Mode Select Input 2 3 6 Output 1 GND 4 5 Output 2 − + 3 + + 2.8V + 1 3x161 ALYW G PIN CONNECTIONS 7 2 MC3x161P AWL YYWWG PDIP−8 P SUFFIX CASE 626 (TOP VIEW) 5 + 0.6V − ORDERING INFORMATION 1.27V See detailed ordering and shipping information in the package dimensions section on page 15 of this data sheet. 4 This device contains 141 transistors. Figure 1. Simplified Block Diagram (Positive Voltage Window Detector Application) © Semiconductor Components Industries, LLC, 2006 June, 2006 − Rev. 9 1 Publication Order Number: MC34161/D MC34161, MC33161, NCV33161 MAXIMUM RATINGS (Note 1) Symbol Value Unit Power Supply Input Voltage VCC 40 V Comparator Input Voltage Range Vin − 1.0 to +40 V Comparator Output Sink Current (Pins 5 and 6) (Note 2) ISink 20 mA Comparator Output Voltage Vout 40 V PD RqJA 800 100 mW °C/W PD RqJA 450 178 mW °C/W RqJA 240 °C/W Operating Junction Temperature TJ +150 °C Operating Ambient Temperature (Note 3) MC34161 MC33161 NCV33161 TA Storage Temperature Range Tstg Rating Power Dissipation and Thermal Characteristics (Note 2) P Suffix, Plastic Package, Case 626 Maximum Power Dissipation @ TA = 70°C Thermal Resistance, Junction−to−Air D Suffix, Plastic Package, Case 751 Maximum Power Dissipation @ TA = 70°C Thermal Resistance, Junction−to−Air DM Suffix, Plastic Package, Case 846A Thermal Resistance, Junction−to−Ambient °C 0 to +70 − 40 to +105 −40 to +125 − 55 to +150 °C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per MIL−STD−883, Method 3015. Machine Model Method 200 V. 2. Maximum package power dissipation must be observed. Thigh = +70°C for MC34161 3. Tlow = 0°C for MC34161 −40°C for MC33161 +105°C for MC33161 −40°C for NCV33161 +125°C for NCV33161 http://onsemi.com 2 MC34161, MC33161, NCV33161 ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, for typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies [Notes 4 and 5], unless otherwise noted.) Characteristics Symbol Min Typ Max Unit Vth 1.245 1.235 1.27 − 1.295 1.295 V COMPARATOR INPUTS Threshold Voltage, Vin Increasing (TA = 25°C) (TA = Tmin to Tmax) DVth − 7.0 15 mV Threshold Hysteresis, Vin Decreasing VH 15 25 35 mV Threshold Difference |Vth1 − Vth2| VD − 1.0 15 mV VRTD 1.20 1.27 1.32 V IIB − − 40 85 200 400 nA Vth(CH 1) Vth(CH 2) Vref+0.15 0.3 Vref+0.23 0.63 Vref+0.30 0.9 V Output Sink Saturation Voltage (ISink = 2.0 mA) (ISink = 10 mA) (ISink = 0.25 mA, VCC = 1.0 V) VOL − − − 0.05 0.22 0.02 0.3 0.6 0.2 V Off−State Leakage Current (VOH = 40 V) IOH − 0 1.0 mA Output Voltage (IO = 0 mA, TA = 25°C) Vref 2.48 2.54 2.60 V Load Regulation (IO = 0 mA to 2.0 mA) Regload − 0.6 15 mV Line Regulation (VCC = 4.0 V to 40 V) Regline − 5.0 15 mV DVref 2.45 − 2.60 V ISC − 8.5 30 mA ICC − − 450 560 700 900 mA VCC 2.0 4.0 − − 40 40 V Threshold Voltage Variation (VCC = 2.0 V to 40 V) Reference to Threshold Difference (Vref − Vin1), (Vref − Vin2) Input Bias Current (Vin = 1.0 V) (Vin = 1.5 V) MODE SELECT INPUT Mode Select Threshold Voltage (Figure 6) Channel 1 Channel 2 COMPARATOR OUTPUTS REFERENCE OUTPUT Total Output Variation over Line, Load, and Temperature Short Circuit Current TOTAL DEVICE Power Supply Current (VMode, Vin1, Vin2 = GND) (VCC = 5.0 V) (VCC = 40 V) Operating Voltage Range (Positive Sensing) (Negative Sensing) 4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Thigh = +70°C for MC34161 5. Tlow = 0°C for MC34161 −40°C for MC33161 +105°C for MC33161 −40°C for NCV33161 +125°C for NCV33161 http://onsemi.com 3 MC34161, MC33161, NCV33161 500 VCC = 5.0 V RL = 10 k to VCC 5.0 TA = 25°C IIB , INPUT BIAS CURRENT (nA) Vout , OUTPUT VOLTAGE (V) 6.0 4.0 3.0 2.0 TA = 85°C TA = 25°C 1.0 TA = −40°C 0 1.22 1.23 TA = 85°C TA = 25°C TA = −40°C 1.24 1.25 1.26 1.27 Vin, INPUT VOLTAGE (V) 1.28 VCC = 5.0 V VMode = GND TA = 25°C 400 300 200 100 0 1.29 0 t PHL, OUTPUT PROPAGATION DELAY TIME (ns) Figure 2. Comparator Input Threshold Voltage 5.0 8.0 VCC = 5.0 V TA = 25°C 1. VMode = GND, Output Falling 2. VMode = VCC, Output Rising 3. VMode = VCC, Output Falling 4. VMode = GND, Output Rising Vout , OUTPUT VOLTAGE (V) 3000 2400 1800 1 2 1200 3 Undervoltage Detector Programmed to trip at 4.5 V R1 = 1.8 k, R2 = 4.7 k RL = 10 k to VCC Refer to Figure 17 6.0 4.0 2.0 TA = −40°C TA = −25°C TA = −85°C 4 0 2.0 4.0 6.0 8.0 0 10 4.0 6.0 8.0 Figure 4. Output Propagation Delay Time versus Percent Overdrive Figure 5. Output Voltage versus Supply Voltage Channel 2 Threshold Channel 1 Threshold VCC = 5.0 V RL = 10 k to VCC 4.0 3.0 2.0 TA = 85°C TA = 25°C TA = −40°C 1.0 0 0 2.0 VCC, SUPPLY VOLTAGE (V) 6.0 5.0 0 PERCENT OVERDRIVE (%) I Mode , MODE SELECT INPUT CURRENT (μ A) 600 4.0 2.0 3.0 Vin, INPUT VOLTAGE (V) Figure 3. Comparator Input Bias Current versus Input Voltage 3600 Vout , CHANNEL OUTPUT VOLTAGE (V) 1.0 0.5 1.0 1.5 TA = −40°C 2.0 2.5 TA = 85°C TA = 25°C 3.0 3.5 40 VCC = 5.0 V TA = 25°C 35 30 25 20 15 10 5.0 0 0 VMode, MODE SELECT INPUT VOLTAGE (V) Figure 6. Mode Select Thresholds 1.0 2.0 3.0 4.0 VMode, MODE SELECT INPUT VOLTAGE (V) Figure 7. Mode Select Input Current versus Input Voltage http://onsemi.com 4 5.0 MC34161, MC33161, NCV33161 Vref , REFERENCE OUTPUT VOLTAGE (V) Vref, REFERENCE VOLTAGE (V) 2.8 2.4 2.0 1.6 1.2 0.8 VMode = GND TA = 25°C 0.4 0 0 10 20 30 VCC, SUPPLY VOLTAGE (V) 2.610 Vref Max = 2.60 V 2.578 2.546 Vref Typ = 2.54 V 2.514 VCC = 5.0 V VMode = GND 2.482 Vref Min = 2.48 V 2.450 40 −55 0 TA = −40°C −6.0 −8.0 TA = 25°C VCC = 5.0 V VMode = GND TA = 85°C −2.0 −4.0 −10 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 Iref, REFERENCE SOURCE CURRENT (mA) 8.0 0.5 125 0.4 TA = 85°C 0.3 TA = 25°C 0.2 TA = −40°C 0.1 0 0 8.0 12 4.0 Iout, OUTPUT SINK CURRENT (mA) 16 Figure 11. Output Saturation Voltage versus Output Sink Current 1.6 0.8 VMode = GND Pins 2, 3 = 1.5 V 0.6 VMode = VCC Pins 2, 3 = GND I CC , INPUT SUPPLY CURRENT (mA) I CC , SUPPLY CURRENT (mA) 100 VCC = 5.0 V VMode = GND Figure 10. Reference Voltage Change versus Source Current VMode = Vref Pin 1 = 1.5 V Pin 2 = GND 0.4 0.2 ICC measured at Pin 8 TA = 25°C 0 0 25 50 75 TA, AMBIENT TEMPERATURE (°C) Figure 9. Reference Voltage versus Ambient Temperature Vout , OUTPUT SATURATION VOLTAGE (V) Vref , REFERENCE VOLTAGE CHANGE (mV) Figure 8. Reference Voltage versus Supply Voltage −25 0 10 20 30 VCC, SUPPLY VOLTAGE (V) 1.2 0.8 0 40 VCC = 5.0 V VMode = GND TA = 25°C 0.4 0 Figure 12. Supply Current versus Supply Voltage 8.0 12 4.0 Iout, OUTPUT SINK CURRENT (mA) Figure 13. Supply Current versus Output Sink Current http://onsemi.com 5 16 MC34161, MC33161, NCV33161 VCC 8 2.54V Reference Vref 1 Mode Select − 7 + Input 1 + Output 1 2.8V + 2 Channel 1 + 6 − 1.27V − + + 3 + Output 2 0.6V + Input 2 Channel 2 5 − 1.27V 4 GND Figure 14. MC34161 Representative Block Diagram Mode Select Pin 7 Input 1 Pin 2 Output 1 Pin 6 Input 2 Pin 3 Output 2 Pin 5 GND 0 1 0 1 0 1 0 1 Channels 1 & 2: Noninverting Vref 0 1 0 1 0 1 1 0 Channel 1: Noninverting Channel 2: Inverting VCC (>2.0 V) 0 1 1 0 0 1 1 0 Channels 1 & 2: Inverting Figure 15. Truth Table http://onsemi.com 6 Comments MC34161, MC33161, NCV33161 FUNCTIONAL DESCRIPTION Introduction Reference To be competitive in today’s electronic equipment market, 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 flexibility objective is achieved by the utilization of a unique 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 14. 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 15 shows that the Mode Select input has 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 6. The input circuitry forms a tristate switch with thresholds at 0.63 V and Vref + 0.23 V. The mode select input current is 10 mA when connected to the reference output, and 42 mA when connected to a VCC of 5.0 V, refer to Figure 7. 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 11 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 device is capable of sensing positive voltages at a VCC of 1.0 V. These characteristics are important in undervoltage sensing applications where the output must stay in a low state as VCC approaches ground. Figure 5 shows the Output Voltage versus Supply Voltage in an undervoltage sensing application. Note that as VCC drops below the programmed 4.5 V trip point, the output stays in a well defined active low state until VCC drops below 1.0 V. 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 comparator thresholds are crossed. The comparators have an input bias current of 60 nA at their threshold which approximates a 21.2 MW 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 functional at a VCC of 2.0 V. In order to provide enhanced device ruggedness for hostile industrial environments, additional circuitry was designed into the inputs to prevent device latchup as well as to suppress electrostatic discharges (ESD). 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 16 has the LED ‘ON’ when input voltage VS is above trip voltage V2, for overvoltage detection. The dashed line output connection has the LED ‘ON’ when VS is below trip voltage V2, for undervoltage detection. 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. http://onsemi.com 7 MC34161, MC33161, NCV33161 VCC 8 V2 Input VS VHys VS1 V1 R2 GND Output VCC Voltage Pins 5, 6 GND VS2 R1 1 2.54V Reference 7 + 2 + LED ‘ON’ + − 1.27V + R2 3 + R1 + − 1.27V − + 2.8V − + 0.6V 6 5 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 VS1 or VS2 exceeds V2. With the dashed line output connection, the circuit becomes a dual positive undervoltage detector. As the input voltage decreases from the peak towards ground, the LED will turn ‘ON’ when VS1 or VS2 falls below V1. For known resistor values, the voltage trip points are: ǒ V 1 + (V th * V H) R2 R1 Ǔ )1 V 2 + V th ǒ For a specific trip voltage, the required resistor ratio is: R2 R1 Ǔ R2 )1 R1 + V1 V th * V H R2 *1 R1 + V2 V th *1 Figure 16. Dual Positive Overvoltage Detector VCC 8 1 2.54V Reference 7 + V2 Input VS VHys VS1 V1 R2 GND 2 + VS2 Output VCC Voltage Pins 5, 6 GND LED ‘ON’ R1 + R2 R1 + − 1.27V 3 + + − 1.27V − + 2.8V − + 0.6V 6 5 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 VS1 or VS2 falls below V1. With the dashed line output connection, the circuit becomes a dual positive overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when VS1 or VS2 exceeds V2. For known resistor values, the voltage trip points are: ǒ V 1 + (V th * V H) R2 R1 Ǔ )1 V 2 + V th ǒ R2 R1 For a specific trip voltage, the required resistor ratio is: Ǔ R2 )1 R1 + V1 V th * V H *1 Figure 17. Dual Positive Undervoltage Detector http://onsemi.com 8 R2 R1 + V2 V th *1 MC34161, MC33161, NCV33161 VCC 8 GND R2 V1 Input −VS 7 R1 VHys −VS1 V2 2 + R2 R1 Output VCC Voltage Pins 5, 6 GND + + − 1.27V + −VS2 LED ‘ON’ 2.54V Reference 1 3 + + − 1.27V − + 2.8V 6 − + 0.6V 5 4 The above figure shows the MC34161 configured as a dual negative overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when −VS1 or −VS2 exceeds V2. With the dashed line output connection, the circuit becomes a dual negative undervoltage detector. As the input voltage decreases from the peak towards ground, the LED will turn ‘ON’ when −VS1 or −VS2 falls below V1. For known resistor values, the voltage trip points are: V1 + R1 R2 (V th * Vref) ) V th V2 + R1 R2 For a specific trip voltage, the required resistor ratio is: R1 (V th * VH * V ref) ) V th * V H R2 + V 1 * V th R1 V th * V ref R2 + V 2 * V th ) V H V th * V H * V ref Figure 18. Dual Negative Overvoltage Detector VCC 8 R2 GND 7 R1 V1 −VS1 VHys Input −VS V2 2 + R2 R1 Output VCC Voltage Pins 5, 6 GND 2.54V Reference 1 + + − 1.27V + −VS2 3 + LED ‘ON’ + − 1.27V − + 2.8V − + 0.6V 6 5 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 −VS1 or −VS2 falls below V1. With the dashed line output connection, the circuit becomes a dual negative overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when −VS1 or −VS2 exceeds V2. For known resistor values, the voltage trip points are: V1 + R1 R2 (V th * Vref) ) V th V2 + R1 R2 For a specific trip voltage, the required resistor ratio is: R1 (V th * VH * V ref) ) V th * V H R2 + V 1 * V th R1 V th * V ref R2 Figure 19. Dual Negative Undervoltage Detector http://onsemi.com 9 + V 2 * V th ) V H V th * V H * V ref MC34161, MC33161, NCV33161 VCC 8 CH2 V4 V3 CH1 V2 V1 Input VS VHys2 VS VHys1 7 R3 + 2 + GND R2 VCC Output Voltage Pins 5, 6 2.54V Reference 1 ‘ON’ LED ‘OFF’ LED ‘ON’ ‘OFF’ + LED ‘ON’ GND + − 1.27V 3 + R1 + − 1.27V − + 2.8V 6 − + 0.6V 5 4 The above figure shows the MC34161 configured as a positive voltage window detector. This is accomplished by connecting channel 1 as an undervoltage detector, and channel 2 as an overvoltage detector. When the input voltage VS falls out of the window established by V1 and V4, the LED will turn ‘ON’. As the input voltage falls within the window, VS increasing from ground and exceeding V2, or VS decreasing from the peak towards ground and falling below V3, the LED will turn ‘OFF’. With the dashed line output connection, the LED will turn ‘ON’ when the input voltage VS is within the window. For known resistor values, the voltage trip points are: ǒ V 1 + (V th1 * V H1) V 2 + V th1 ǒ R3 R1 ) R2 R3 R1 ) R2 Ǔ )1 Ǔ )1 For a specific trip voltage, the required resistor ratio is: ǒ V 3 + (V th2 * V H2) V 4 + V th2 ǒ R2 ) R3 R2 ) R3 R1 R1 Ǔ R2 )1 R1 Ǔ R2 )1 R1 + + V 3(V th2 * V H2) V 1(V th1 * V H1) R3 *1 R1 V 4 x V th2 *1 V 2 x V th1 R3 R1 Figure 20. Positive Voltage Window Detector + + V 3(V 1 * V th1 ) V H1) V 1(V th2 * V H2) V 4(V 2 * V th1) V 2 x V th2 VCC 8 CH2 Input −VS 2.54V Reference 1 GND V1 VHys2 V2 CH1 V3 V4 7 R3 + 2 + VHys1 R2 + − 1.27V + Output Voltage Pins 5, 6 VCC ‘ON’ LED ‘OFF’ LED ‘ON’ ‘OFF’ LED ‘ON’ GND 3 + R1 + − 1.27V −VS − + 2.8V − + 0.6V 6 5 4 The above figure shows the MC34161 configured as a negative voltage window detector. When the input voltage −VS falls out of the window established by V1 and V4, the LED will turn ‘ON’. As the input voltage falls within the window, −VS increasing from ground and exceeding V2, or −VS decreasing from the peak towards ground and falling below V3, the LED will turn ‘OFF’. With the dashed line output connection, the LED will turn ‘ON’ when the input voltage −VS is within the window. For known resistor values, the voltage trip points are: V1 + V2 + V3 + V4 + R 1(V th2 * V ref) R2 ) R3 For a specific trip voltage, the required resistor ratio is: R1 ) V th2 R 1(V th2 * V H2 * V ref) R2 ) R3 (R 1 ) R 2)(V th1 * V ref) R3 R2 ) R3 R2 ) R3 R3 ) Vth1 (R 1 ) R 2)(V th1 * V H1 * Vref) R3 R1 ) Vth2 * V H2 R1 ) R2 R3 ) V th1 * V H1 R1 ) R2 + + + + Figure 21. Negative Voltage Window Detector http://onsemi.com 10 V 1 * V th2 V th2 * V ref V 2 * V th2 ) VH2 V th2 * V H2 * Vref V th1 * V ref V 3 * V th1 V th1 * V H1 * Vref V 4 ) V H1 * Vth1 MC34161, MC33161, NCV33161 VCC 8 V4 Input VS2 1 GND 7 R4 Input −VS1 Output Voltage Pins 5, 6 2.54V Reference VHys2 V3 −VS1 V1 V2 VCC 2 + R3 VHys1 + + − 1.27V + R2 LED ‘ON’ VS2 GND 3 + R1 + − 1.27V − + 2.8V 6 − + 0.6V 5 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’ when either −VS1 exceeds V2, or VS2 exceeds V4. With the dashed line output connection, the circuit becomes a positive and negative undervoltage detector. As the input voltage decreases from the peak towards ground, the LED will turn ‘ON’ when either VS2 falls below V3, or −VS1 falls below V1. For known resistor values, the voltage trip points are: V1 + V2 + R3 R4 R3 R4 For a specific trip voltage, the required resistor ratio is: ǒ Ǔ (V th1 * Vref) ) V th1 V 3 + (V th2 * V H2) (V th1 * VH1 * V ref) ) V th1 * V H1 V 4 + V th2 ǒ R2 R1 R2 R1 Ǔ R3 )1 R4 R3 )1 R4 + + (V 1 * V th1) R2 (V th1 * V ref) R1 (V 2 * V th1 ) V H1) R2 (V th1 * V H1 * V ref) R1 + + V4 V th2 *1 V3 V th2 * V H2 *1 Figure 22. Positive and Negative Overvoltage Detector VCC 8 V2 V1 Input VS1 2.54V Reference VHys1 1 GND 7 R4 V3 Input −VS2 VS1 VHys2 V4 + 2 + R3 + − 1.27V R2 VCC Output Voltage Pins 5, 6 GND LED ‘ON’ + 3 + R1 + − 1.27V −VS2 − + 2.8V 6 − + 0.6V 5 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 VS1 falls below V1, or −VS2 falls below V3. With the dashed line output connection, the circuit becomes a positive and negative overvoltage detector. As the input voltage increases from the ground, the LED will turn ‘ON’ when either VS1 exceeds V2, or −VS1 exceeds V1. For known resistor values, the voltage trip points are: ǒ Ǔ V 1 + (V th1 * V H1) V 2 + V th1 ǒ R4 R3 )1 R4 R3 Ǔ )1 V3 + V4 + R1 R2 R1 R2 For a specific trip voltage, the required resistor ratio is: R4 (V th * Vref) ) V th2 R3 (V th * VH2 * V ref) ) V th2 * V H2 R4 R3 + + V2 V th1 V1 V th1 * V H1 Figure 23. Positive and Negative Undervoltage Detector http://onsemi.com 11 R1 *1 R2 *1 R1 R2 + + V 4 ) V H2 * V th2 V th2 * V H2 * V ref V 3 * V th2 V th2 * V ref MC34161, MC33161, NCV33161 VCC 8 VHys Input VS 1 VS V1 7 R2 GND Output Voltage Pins 5, 6 VCC + + − 1.27V 2 + R1 RA 2.54V Reference V2 Osc ‘ON’ + GND + − 1.27V 3 + Piezo − + 2.8V 6 − + 0.6V 5 4 RB CT The above figure shows the MC34161 configured as an overvoltage detector with an audio alarm. Channel 1 monitors input voltage VS while channel 2 is connected as a simple RC oscillator. As the input voltage increases from ground, the output of channel 1 allows the oscillator to turn ‘ON’ when VS exceeds V2. For known resistor values, the voltage trip points are: ǒ V 1 + (V th * V H) R2 R1 Ǔ ǒ For a specific trip voltage, the required resistor ratio is: Ǔ R ) 1 V 2 + V th 2 ) 1 R1 R2 R1 + V1 V th * V H R2 *1 R1 + V2 V th *1 Figure 24. Overvoltage Detector with Audio Alarm VCC 8 Input VS V2 V1 2.54V Reference 1 VHys 7 GND Output Voltage Pin 5 2 + VS VCC GND R2 3 + R1 VCC − + 0.6V + tDLY Output Voltage Pin 6 + − 1.27V − + + 2.8V + − 1.27V R3 6 RDLY 5 Reset LED ‘ON’ GND 4 CDLY The above figure shows the MC34161 configured as a microprocessor reset with a time delay. Channel 2 monitors input voltage VS while channel 1 performs the time delay function. As the input voltage decreases towards ground, the output of channel 2 quickly discharges CDLY when VS falls below V1. As the input voltage increases from ground, the output of channel 2 allows RDLY to charge CDLY when VS exceeds V2. For known resistor values, the voltage trip points are: ǒ V 1 + (V th * V H) R2 R1 Ǔ )1 V 2 + V th ǒ R2 R1 For a specific trip voltage, the required resistor ratio is: Ǔ R2 )1 For known RDLY CDLY values, the reset time delay is: R1 tDLY = RDLYCDLY In + V1 V th * V H *1 1 Vth 1− VCC Figure 25. Microprocessor Reset with Time Delay http://onsemi.com 12 R2 R1 + V2 V th *1 MC34161, MC33161, NCV33161 B+ MAC 228A6FP 220 250V 75k + 220 250V 75k MR506 T Input 92 Vac to 276 Vac + 8 3.0A 2.54V Reference 1 10k 7 2 + + 100k + − 1.27V + 1.6M 3 + 1N 4742 + 10 10k + + − 1.27V 47 − + 2.8V − + 0.6V 1.2k RTN 6 5 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 kW resistor and the 10 mF capacitor. If the line voltage is greater than 150 V, the circuit will immediately return to fullwave bridge mode. Figure 26. Automatic AC Line Voltage Selector http://onsemi.com 13 MC34161, MC33161, NCV33161 470mH Vin 12V MPS750 330 + 8 2.54V Reference 1 0.01 4.7k 1.6k 7 2 + + + − 1.27V + 3 + + − 1.27V 1N5819 470 1000 VO 5.0V/250mA 1.8k 0.01 − + 2.8V + 6 − + 0.6V 5 47k 4 0.005 Figure 27. Step−Down Converter Test Conditions Results Line Regulation Vin = 9.5 V to 24 V, IO = 250 mA 40 mV = ±0.1% Load Regulation Vin = 12 V, IO = 0.25 mA to 250 mA 2.0 mV = ±0.2% Output Ripple Vin = 12 V, IO = 250 mA 50 mVpp Efficiency Vin = 12 V, IO = 250 mA 87.8% 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 powerup, 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. http://onsemi.com 14 MC34161, MC33161, NCV33161 ORDERING INFORMATION Device MC34161D Package SOIC−8 MC34161DG SOIC−8 (Pb−Free) MC34161DR2 SOIC−8 MC34161DR2G SOIC−8 (Pb−Free) MC34161DMR2 Micro8 MC34161DMR2G MC34161P MC34161PG MC33161D Micro8 (Pb−Free) PDIP−8 (Pb−Free) MC33161DR2 SOIC−8 MC33161DR2G SOIC−8 (Pb−Free) MC33161DMR2 Micro8 MC33161PG NCV33161DR2* 2500/Tape & Reel 4000/Tape & Reel 50 Units/Rail SOIC−8 SOIC−8 (Pb−Free) MC33161P 98 Units/Rail PDIP−8 MC33161DG MC33161DMR2G Shipping† Micro8 (Pb−Free) 98 Units/Rail 2500/Tape & Reel 4000/Tape & Reel PDIP−8 PDIP−8 (Pb−Free) 50 Units/Rail SOIC−8 2500/Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *NCV: Tlow = −40°C, Thigh = +125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and control changes. http://onsemi.com 15 MC34161, MC33161, NCV33161 PACKAGE DIMENSIONS PDIP−8 CASE 626−05 ISSUE L 8 NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 5 −B− 1 4 F −A− NOTE 2 L C J −T− N SEATING PLANE D H M K G 0.13 (0.005) M T A M B M http://onsemi.com 16 DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 9.40 10.16 6.10 6.60 3.94 4.45 0.38 0.51 1.02 1.78 2.54 BSC 0.76 1.27 0.20 0.30 2.92 3.43 7.62 BSC −−− 10_ 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC −−− 10_ 0.030 0.040 MC34161, MC33161, NCV33161 PACKAGE DIMENSIONS SOIC−8 NB CASE 751−07 ISSUE AH NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. 751−01 THRU 751−06 ARE OBSOLETE. NEW STANDARD IS 751−07. −X− A 8 5 S B 1 0.25 (0.010) M Y M 4 K −Y− G C N DIM A B C D G H J K M N S X 45 _ SEATING PLANE −Z− 0.10 (0.004) H D 0.25 (0.010) M Z Y S X M J S SOLDERING FOOTPRINT* 1.52 0.060 7.0 0.275 4.0 0.155 0.6 0.024 1.270 0.050 SCALE 6:1 mm Ǔ ǒinches *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. http://onsemi.com 17 MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.33 0.51 1.27 BSC 0.10 0.25 0.19 0.25 0.40 1.27 0_ 8_ 0.25 0.50 5.80 6.20 INCHES MIN MAX 0.189 0.197 0.150 0.157 0.053 0.069 0.013 0.020 0.050 BSC 0.004 0.010 0.007 0.010 0.016 0.050 0 _ 8 _ 0.010 0.020 0.228 0.244 MC34161, MC33161, NCV33161 PACKAGE DIMENSIONS Micro8t CASE 846A−02 ISSUE G NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE. 5. 846A−01 OBSOLETE, NEW STANDARD 846A−02. D HE PIN 1 ID E DIM A A1 b c D E e L HE e b 8 PL 0.08 (0.003) T B M S A S SEATING −T− PLANE 0.038 (0.0015) MILLIMETERS NOM MAX −− 1.10 0.08 0.15 0.33 0.40 0.18 0.23 3.00 3.10 3.00 3.10 0.65 BSC 0.40 0.55 0.70 4.75 4.90 5.05 MIN −− 0.05 0.25 0.13 2.90 2.90 INCHES NOM −− 0.003 0.013 0.007 0.118 0.118 0.026 BSC 0.021 0.016 0.187 0.193 MIN −− 0.002 0.010 0.005 0.114 0.114 MAX 0.043 0.006 0.016 0.009 0.122 0.122 0.028 0.199 A A1 L c SOLDERING FOOTPRINT* 8X 1.04 0.041 0.38 0.015 3.20 0.126 6X 8X 4.24 0.167 0.65 0.0256 5.28 0.208 SCALE 8:1 mm Ǔ ǒinches *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. Micro8 is a trademark of International Rectifier. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. 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