MC34161, MC33161 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. • 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 http://onsemi.com MARKING DIAGRAMS 8 PDIP–8 P SUFFIX CASE 626 8 MC3x161P AWL YYWW 1 1 8 3x161 ALYW SO–8 D SUFFIX CASE 751 8 1 1 x = 3 or 4 A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week PIN CONNECTIONS Simplified Block Diagram (Positive Voltage Window Detector Application) Vref 1 8 VCC Input 1 2 7 Mode Select Input 2 3 6 Output 1 Gnd 4 5 Output 2 VCC 8 1 VS (TOP VIEW) 2.54V Reference 7 ORDERING INFORMATION – + 2 + + Device 6 – 1.27V – + 3 + + + 2.8V + 5 0.6V – 1.27V Package Shipping MC34161D SO–8 98 Units/Rail MC34161DR2 SO–8 2500 Tape & Reel MC34161P PDIP–8 50 Units/Rail MC33161D SO–8 98 Units/Rail MC33161DR2 SO–8 2500 Tape & Reel PDIP–8 50 Units/Rail MC33161P 4 Semiconductor Components Industries, LLC, 2000 April, 2000 – Rev. 2 1 Publication Order Number: MC34161/D MC34161, MC33161 MAXIMUM RATINGS Rating Symbol Value Unit VCC 40 V Vin – 1.0 to +40 V Comparator Output Sink Current (Pins 5 and 6) (Note 1.) ISink 20 mA Comparator Output Voltage Vout 40 V Power Dissipation and Thermal Characteristics (Note 1.) 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 PD RθJA 800 100 mW °C/W PD RθJA 450 178 mW °C/W Operating Junction Temperature TJ +150 °C Operating Ambient Temperature (Note 3.) MC34161 MC33161 TA Power Supply Input Voltage Comparator Input Voltage Range °C 0 to +70 – 40 to +85 Storage Temperature Range Tstg °C – 55 to +150 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 2. and 3.], unless otherwise noted.) Characteristics Symbol Min Typ Max Unit Vth 1.245 1.235 1.27 – 1.295 1.295 V ∆Vth – 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) Output Sink Saturation Voltage (ISink = 10 mA) Output Sink Saturation Voltage (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 µA 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 ∆Vref 2.45 – 2.60 V ISC – 8.5 30 mA Power Supply Current (VMode, Vin1, Vin2 = Gnd) (VCC = 5.0 V) Power Supply Current (VMode, Vin 1, Vin 2 = Gd) (VCC = 40 V) ICC – – 450 560 700 900 µA Operating Voltage Range (Positive Sensing) Operating Voltage Range (Negative Sensing) VCC 2.0 4.0 – – 40 40 V COMPARATOR INPUTS Threshold Voltage, Vin Increasing (TA = 25°C) Threshold Voltage, Vin Increasing (TA = Tmin to Tmax) 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) Input Bias Current (Vin = 1.5 V) MODE SELECT INPUT Mode Select Threshold Voltage (Figure 5) Channel 1 Mode Select Threshold Voltage (Figure 5) Channel 2 COMPARATOR OUTPUTS REFERENCE OUTPUT Total Output Variation over Line, Load, and Temperature Short Circuit Current TOTAL DEVICE 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. Tlow = 0°C for MC34161 Thigh = +70°C for MC34161 –40°C for MC33161 +85°C for MC33161 http://onsemi.com 2 MC34161, MC33161 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 1. Comparator Input Threshold Voltage 4.0 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 16 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 3. Output Propagation Delay Time versus Percent Overdrive Figure 4. 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) Vout , CHANNEL OUTPUT VOLTAGE (V) 2.0 3.0 Vin, INPUT VOLTAGE (V) Figure 2. Comparator Input Bias Current versus Input Voltage 3600 600 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 5. Mode Select Thresholds 1.0 2.0 3.0 4.0 VMode, MODE SELECT INPUT VOLTAGE (V) Figure 6. Mode Select Input Current versus Input Voltage http://onsemi.com 3 5.0 MC34161, MC33161 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 –2.0 VCC = 5.0 V VMode = Gnd TA = –40°C –6.0 –8.0 TA = 25°C TA = 85°C –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 4.0 8.0 12 Iout, OUTPUT SINK CURRENT (mA) 16 Figure 10. Output Saturation Voltage versus Output Sink Current 1.6 0.8 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 9. Reference Voltage Change versus Source Current VMode = Gnd Pins 2, 3 = 1.5 V 0.6 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 8. Reference Voltage versus Ambient Temperature Vout , OUTPUT SATURATION VOLTAGE (V) Vref , REFERENCE VOLTAGE CHANGE (mV) Figure 7. 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 11. Supply Current versus Supply Voltage 4.0 8.0 12 Iout, OUTPUT SINK CURRENT (mA) Figure 12. Supply Current versus Output Sink Current http://onsemi.com 4 16 MC34161, MC33161 VCC 8 2.54V Reference Vref 1 Mode Select – 7 + Input 1 + Output 1 2.8V + 2 Channel 1 + 6 – 1.27V – + + Input 2 + Output 2 0.6V + 3 Channel 2 5 – 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 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 14. Truth Table http://onsemi.com 5 Comments MC34161, MC33161 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 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 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 5. 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 µA when connected to the reference output, and 42 µA when connected to a VCC of 5.0 V, refer to Figure 6. 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 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 4 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 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 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 latch–up 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 15 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 6 MC34161, MC33161 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. ǒ Ǔ ǒ Ǔ For known resistor values, the voltage trip points are: V1 + (Vth * VH) R2 R1 )1 V2 + Vth R2 R1 For a specific trip voltage, the required resistor ratio is: )1 R2 R1 + V V*1 V * 1 th H R2 R1 + VV2 * 1 th Figure 15. Dual Positive Overvoltage Detector VCC 8 1 2.54V Reference 7 + V2 Input VS VHys VS1 V1 R2 Gnd VS2 Output VCC Voltage Pins 5, 6 Gnd LED ‘ON’ 2 + R1 + – 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 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. ǒ Ǔ ǒ Ǔ For known resistor values, the voltage trip points are: V1 + (Vth * VH) R2 R1 )1 V2 + Vth R2 R1 For a specific trip voltage, the required resistor ratio is: )1 R2 R1 + V V*1 V * 1 th H Figure 16. Dual Positive Undervoltage Detector http://onsemi.com 7 R2 R1 + VV2 * 1 th MC34161, MC33161 VCC 8 Gnd R2 V1 Input –VS 7 R1 VHys –VS1 V2 2 + R2 R1 VCC Output 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 + RR1 (Vth * Vref) ) Vth 2 V2 For a specific trip voltage, the required resistor ratio is: + RR1 (Vth * VH * Vref) ) Vth * VH R1 R2 2 + VV1 ** VVth th R1 R2 ref + VV2 ** VVth *) VVH th H ref Figure 17. Dual Negative Overvoltage Detector VCC 8 R2 Gnd –VS1 VHys Input –VS V2 1 7 R1 V1 2 + R2 R1 VCC Output Voltage Pins 5, 6 Gnd 2.54V Reference –VS2 + – 1.27V + 3 + LED ‘ON’ + + – 1.27V – + 2.8V 6 – + 0.6V 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 +R R1 2 (V th * Vref) ) Vth V2 +R R1 2 (V th For a specific trip voltage, the required resistor ratio is: * VH * Vref) ) Vth * VH R1 R2 + VV1 ** VVth th Figure 18. Dual Negative Undervoltage Detector http://onsemi.com 8 ref R1 R2 + VV2 ** VVth *) VVH th H ref MC34161, MC33161 VCC 8 CH2 V4 V3 CH1 V2 V1 Input VS VHys2 VS VHys1 1 7 R3 + 2 + Gnd R2 VCC Output Voltage Pins 5, 6 2.54V Reference ‘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. ǒ Ǔ ǒ For known resistor values, the voltage trip points are: V1 + (Vth1 * VH1) V2 + Vth1 ǒ ) R2 ) 1 R3 R1 Ǔ ) R2 ) 1 R3 R1 V3 + (Vth2 * VH2) V4 + Vth2 ǒ R2 R2 Ǔ R1 ) R3 ) 1 R1 Ǔ For a specific trip voltage, the required resistor ratio is: ) R3 ) 1 R2 R1 R2 R1 + VV3(V(Vth2 ** VVH2)) * 1 R1 + VV4 R1 1 th1 H1 x Vth2 2 x V th1 *1 R3 R3 Figure 19. Positive Voltage Window Detector ) VH1) + V3(VV 1(V* Vth1 *V ) 1 th2 H2 + V4V(V2x*VVth1) 2 th2 VCC 8 CH2 Input –VS 2.54V Reference 1 Gnd V1 V2 VHys2 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: + R1(VRth2)*RVref) ) Vth2 2 3 R 1(V th2 * V H2 * V ref) V2 + ) Vth2 * VH2 R2 ) R3 (R 1 ) R 2)(V th1 * V ref) V3 + ) Vth1 R3 (R 1 ) R 2)(V th1 * V H1 * Vref) V + )V *V For a specific trip voltage, the required resistor ratio is: V 1 * V th2 ) R3 + Vth2 * Vref R1 + VV2 **VVth2 )*VVH2 R2 ) R3 th2 H2 ref V th1 * V ref R3 + V *V R1 ) R2 3 th1 V th1 * V H1 * Vref R3 + V )V *V R )R R1 V1 4 R3 th1 R2 H1 1 2 Figure 20. Negative Voltage Window Detector http://onsemi.com 9 4 H1 th1 MC34161, MC33161 VCC 8 V4 Input VS2 1 Gnd V1 V2 Input –VS1 7 R4 –VS1 VHys1 VCC Output Voltage Pins 5, 6 2.54V Reference VHys2 V3 + + – 1.27V 2 + R3 + R2 LED ‘ON’ VS2 Gnd + – 1.27V 3 + R1 – + 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 +R V2 +R R3 4 R3 4 (V th1 * Vref) ) Vth1 (V th1 * VH1 * Vref) ) Vth1 * VH1 ǒ Ǔ ǒ Ǔ V3 + (Vth2 * VH2) V4 + Vth2 R2 R1 R2 R1 For a specific trip voltage, the required resistor ratio is: + (V(V1 **VVth1)) th1 ref (V 2 * V th1 ) V H1) R3 + (V * V * V ) R4 th1 H1 ref )1 R3 R2 R4 )1 R1 R2 R1 + VV4 * 1 th2 + V V*3 V * 1 th2 H2 Figure 21. 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 Output VCC 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. ǒ Ǔ ǒ Ǔ For known resistor values, the voltage trip points are: V1 + (Vth1 * VH1) V2 + Vth1 R4 R3 )1 R4 R3 )1 For a specific trip voltage, the required resistor ratio is: V3 + RR1 (Vth * Vref) ) Vth2 V4 + RR1 (Vth * VH2 * Vref) ) Vth2 * VH2 R4 R3 2 2 R4 R3 + VV2 * 1 th1 + V V*1 V * 1 th1 H1 Figure 22. Positive and Negative Undervoltage Detector http://onsemi.com 10 R1 R2 R1 R2 + VV4 )*VVH2 **VVth2 th2 H2 th2 ref + VV3 **VVth2 ref MC34161, MC33161 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. ǒ Ǔ ǒ Ǔ For known resistor values, the voltage trip points are: V1 + (Vth * VH) R2 R1 )1 V2 + Vth R2 R1 For a specific trip voltage, the required resistor ratio is: )1 R2 R1 + V V*1 V * 1 th H R2 R1 + VV2 * 1 th Figure 23. Overvoltage Detector with Audio Alarm VCC 8 Input VS V2 V1 2.54V Reference 1 VHys 7 Gnd Output Voltage Pin 5 VCC Output Voltage Pin 6 VCC VS Gnd 2 + + – 1.27V R2 tDLY R1 – + + 2.8V + 3 + + – 1.27V – + 0.6V 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. ǒ Ǔ ǒ Ǔ For known resistor values, the voltage trip points are: V1 + (Vth * VH) R2 R1 )1 V2 + Vth R2 R1 For a specific trip voltage, the required resistor ratio is: )1 For known RDLY CDLY values, the reset time delay is: R2 R1 tDLY = RDLYCDLY In + V V*1 V * 1 th H 1 Vth 1– VCC Figure 24. Microprocessor Reset with Time Delay http://onsemi.com 11 R2 R1 + VV2 * 1 th MC34161, MC33161 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 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 http://onsemi.com 12 MC34161, MC33161 470µH 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 26. 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 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. http://onsemi.com 13 MC34161, MC33161 PACKAGE DIMENSIONS PDIP P SUFFIX CASE 626–05 ISSUE K 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 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 4 DIM A B C D F G H J K L M N F –A– NOTE 2 L C J –T– 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 N SEATING PLANE D M K G H 0.13 (0.005) M T A M B M SO–8 D SUFFIX CASE 751–06 ISSUE T D A 8 NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 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. C 5 0.25 H E M B M 1 4 h B e X 45 _ q A C SEATING PLANE L 0.10 A1 B 0.25 M C B S A S DIM A A1 B C D E e H h L q http://onsemi.com 14 MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_ MC34161, MC33161 Notes http://onsemi.com 15 MC34161, MC33161 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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