5.4 MC34161, MC33161 SPICE MODELING Scope ON SEMICONDUCTOR MC3X161 MODEL

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Erick Perkins
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1 ON SEMICONDUCTOR 5.4 MC3X6 MODEL 5.4 MC346, MC336 SPICE MODELING 5.4. Scope The purpose of this analysis is to model MC346, MC336 Universal Voltage Monitors Analysis: Universal Voltage Monitor modeling Performed by: Last Rev Date: September 4, 2006 Publication Number: Revision SPICE File MC346/D April, 200-Rev.4 MC336\test.cir

2 ON SEMICONDUCTOR MC3X6 MODEL Functional Description The MC346, MC336 Universal Voltage Monitors are used as signal conditional. The device has two inputs and outputs. The two output channels can be programmed, from a mode select input (pin 7), as both non-inverting or inverting, or output is non inverting and output 2 is inverting Assumptions. The temperature for this model is 25 degrees centigrade. 2. Under voltage lockout circuit for the output drivers are not shown in figure block diagram of the Publication Order Number MC346/D; therefore, the circuits were not included in the model. The model is valid for VCC greater than 4.5V. 3. No propagation delays in the model. 4. No Comparator input bias current in the model Methods of modeling IsSpice4 was used to model the device. The model Spice net list is as follows: *SYM=MC336.SUBCKT MC * VREF IN IN2 GND OUT2 OUT MODE VCC.MODEL COMP SW (VT=.27 VH=0.025 RON=K ROFF=0MEG).MODEL DMOD D (IS=E-6).MODEL QN NPN (BF=200 RC=8.5).MODEL QN2 NPN (BF=500).MODEL M NMOS VTO=2.3 KP=00 Bicc 3 7 i=v(3) >.6? 380u : 0 R 2 3 MEG BCOND 4 7 V=V(2) > 2.5? 5 : 0 R K V3 0 2 R K I U D2 7 6 DMOD

3 ON SEMICONDUCTOR MC3X6 MODEL D5 9 DMOD D6 9 DMOD BCOMP 2 7 V=2.8 < V()? 5 : 0 ; It was 2.8 > V() BXOR 3 7 V=ABS(V(2,4)) < 2.5? 5 : 0 R K Q QN S COMP R8 7 3 MEG B2 6 7 V=V(7) > 2.5? 5 : 0 BCOM2B 20 7 V=0.6 < V()? 5 : 0 ; It was 0.6 > V() BXOR2 9 7 V=ABS(V(20,6)) < 2.5? 5 : 0 R K Q QN Q QN2 R K R R K R K M M S COMP.ENDS The model was simulated and the results were correlated to the actual data points. The Spice test circuit for mode select Vref is shown in figure 5.4., and the Spice net List is shown in figure In addition, the model Comparator Input threshold Voltage, Output Saturation voltage, and Supply Current in figures to were compared to the published electrical characteristic data.

4 ON SEMICONDUCTOR MC3X6 MODEL Vin X MC336 VREF VCC Vcc V INPUT INPUT 2 OUTPUT GND MODE OUTPUT 2 4 Out R 0K V2 5 R2 0K 3 Out2 Figure Spice test circuit for mode-select (Vref). For mode-select Vcc and ground, the mode pin should be connected to Vcc pin or ground respectively. Figure SPICE test fixture Net List *INCLUDE ON.LIB.TRAN M OP.DC V *ALIAS V(4)=OUT *ALIAS V(3)=OUT2.PRINT DC V().PRINT TRAN V(4) V(3) V(6) V 6 0 PULSE U M M 2 V R 4 2 0MEG R MEG H 0 V2 - X MC336.END

5 ON SEMICONDUCTOR MC3X6 MODEL Mode Select - Ground Vin m 3 Plot out in volts 2.80 out2 in volts 8.40 vin in volts Vout Vout m m time in seconds Figure SPICE Waveforms of mode-select ground configuration Mode Select - Vref Vin m 3 Plot out2 in volts 8.40 out in volts 2.80 vin in volts Vout Vout2 400m m time in seconds Figure SPICE Waveforms of mode-select Vref configuration

6 ON SEMICONDUCTOR MC3X6 MODEL Mode Select - Vcc Vin m 3 Plot out2 in volts 8.80 out in volts 2.40 vin in volts Vout Vout2 800m m time in seconds Figure SPICE Waveforms of mode-select Vcc configuration

7 ON SEMICONDUCTOR MC3X6 MODEL 60.0U MODE SELECT in Amps 40.0U 20.0U 0 x < U > x < U > -20.0U 500M WFM. MODE AMP vs.mode INPUT in Volts Δx = 500M Δy = 23.4U Figure SPICE Waveform of mode select input current Vs Voltage

8 ON SEMICONDUCTOR MC3X6 MODEL 650M Output saturation voltage in Volts 450M 250M 50.0M x < 8.04M 98M > -50M x < 0 7.9M > 2.00M 6.00M 0.0M 4.0M 8.0M WFM. VSAT vs. Sink Current in Amps Δx = 8.04M Δy = 80M Figure SPICE Waveform of output saturation voltage Vs Sink Current

9 ON SEMICONDUCTOR MC3X6 MODEL 6.00 Output Voltage in Volts x < N > 200M 600M WFM. OUT vs. Input Voltage in Volts Comparator Input Threshold Voltage Figure SPICE Waveform of input voltage Vs Output Voltage

10 ON SEMICONDUCTOR MC3X6 MODEL 750U Supply Current in Amps 650U 550U 450U 350U WFM. ICC vs. VCC in Volts Supply Current Vs Supply Voltage Figure SPICE Waveform of supply current Vs Voltage

11 ON SEMICONDUCTOR 5.4 MC3X6 MODEL Q MPS750 9 L 470u Vout Vout V 2 4 Vin C2 330u C.0u 3 R3 4.7k 8 VREF INPUT VCC MODE R C3.0u R2.8k D2 n589 X2 R6 25 R4.6k INPUT 2 OUTPUT GND OUTPUT 2 X MC336 5 R5 47k C5.005u Figure V regulated output application circuit using MC336. vout Plot vout in volts m 22.9m 23.5m 24.m 24.7m time in seconds Figure 5.4. Simulation voltage output response.

12 ON SEMICONDUCTOR MC3X6 MODEL Conclusions and Recommendations The Spice simulation result of the reference output voltage was 2.532Vdc, and the short circuit current was 8.33mA. Figure to are in agreement with the device truth table configurations and all the simulation results are within the electrical characteristic specifications.

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