(MC33067 / MC34067) HIGH PERFORMANCE ZERO VOLTAGE SWITCH RESONANT MODE CONTROLLERS

Order this document by MC34067/D High Performance Resonant Mode Controllers The MC34067/MC33067 are high performance zero voltage switch resonant mode controllers designed for off–line and dc–to–dc converter applications that utilize frequency modulated constant off–time or constant deadtime control. These integrated circuits feature a variable frequency oscillator, a precise retriggerable one–shot timer, temperature compensated reference, high gain wide bandwidth error amplifier, steering flip–flop, and dual high current totem pole outputs ideally suited for driving power MOSFETs. Also included are protective features consisting of a high speed fault comparator, programmable soft–start circuitry, input undervoltage lockout with selectable thresholds, and reference undervoltage lockout. These devices are available in dual–in–line and surface mount packages. • Zero Voltage Switch Resonant Mode Operation MC34067 MC33067 HIGH PERFORMANCE ZERO VOLTAGE SWITCH RESONANT MODE CONTROLLERS SEMICONDUCTOR TECHNICAL DATA • • • • • • • • • Variable Frequency Oscillator with a Control Range Exceeding 1000:1 Precision One–Shot Timer for Controlled Off–Time Internally Trimmed Bandgap Reference 4.0 MHz Error Amplifier Dual High Current Totem Pole Outputs Selectable Undervoltage Lockout Thresholds with Hysteresis Enable Input Programmable Soft–Start Circuitry Low Startup Current for Off–Line Operation P SUFFIX PLASTIC PACKAGE CASE 648 16 1 DW SUFFIX PLASTIC PACKAGE CASE 751G (SO–16L) 16 1 PIN CONNECTIONS Osc Charge 1 Osc RC 2 16 One–Shot RC 15 VCC 14 Drive Output A 13 Power Gnd 12 Drive Output B 11 CSoft–Start 10 Fault Input Enable/UVLO 9 Adjust (Top View) Simplified Block Diagram VCC 15 VCC UVLO / Enable Variable Frequency Oscillator 5.0 V Reference Vref UVLO 14 One–Shot 2.5 V Clamp Steering Flip–Flop 5 Vref Osc Control Current 3 Gnd 4 Vref 5 Error Amp Out 6 Inverting Input 7 Noninverting Input 8 Output A Enable / 9 UVLO Adjust 1 Osc Charge 2 Osc RC Oscillator 3 Control Current One–Shot 16 12 Output B 13 Pwr Gnd Error Amp 6 Output Noninverting 8 Input Inverting Input 7 Soft–Start 11 ORDERING INFORMATION Error Amp Soft–Start Fault Detector 10 Fault Input Device MC34067DW MC34067P MC33067DW MC33067P Operating Temperature Range TA = 0 to + 70°C TA = – 40° to + 85°C Package SO–16L Plastic DIP SO–16L Plastic DIP Rev 1, 05/99 4 Ground © Motorola, Inc. 1999 MOTOROLA ANALOG IC DEVICE DATA 1 MC34067 MC33067 MAXIMUM RATINGS Rating Power Supply Voltage Drive Output Current, Source or Sink (Note 1) Continuous Pulsed (0.5 µs, 25% Duty Cycle Error Amplifier, Fault, One–Shot, Oscillator and Soft–Start Inputs UVLO Adjust Input Power Dissipation and Thermal Characteristics DW Suffix, Plastic Package, Case 751G TA = 25°C Thermal Resistance, Junction–to–Air P Suffix, Plastic Package, Case 648 TA = 25°C Thermal Resistance, Junction–to–Air Operating Junction Temperature Operating Ambient Temperature MC34067 MC33067 Storage Temperature Symbol VCC IO Vin Vin(UVLO) Value 20 0.3 1.5 – 1.0 to + 6.0 – 1.0 to VCC V V Unit V A PD RθJA PD RθJA TJ TA 862 145 1.25 100 + 150 0 to + 70 – 40 to + 85 mW °C/W W °C/W °C °C Tstg – 55 to + 150 °C ELECTRICAL CHARACTERISTICS (VCC = 12 V [Note 2], ROSC= 18.2 k, RVFO = 2940, COSC = 300 pF, RT = 2370 k, CT = 300 pF, CL = 1.0 nF. For typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies [Note 3], unless otherwise noted.) Characteristic REFERENCE SECTION Reference Output Voltage (IO = 0 mA, TJ = 25°C) Line Regulation (VCC = 10 TO 18 V) Load Regulation (IO = 0 mA to 10 mA) Total Output Variation Over Line, Load, and Temperature Output Short Circuit Current Reference Undervoltage Lockout Threshold ERROR AMPLIFIER Input Offset Voltage (VCM = 1.5 V) Input Bias Current (VCM = 1.5 V) Input Offset Current (VCM = 1.5 V) Open Loop Voltage Gain (VCM = 1.5 V, VO = 2.0 V) Gain Bandwidth Product (f = 100 kHz) Input Common Mode Rejection Ratio (VCM = 1.5 to 5.0 V) Power Supply Rejection Ratio (VCC = 10 to 18 V, f = 120 Hz) Output Voltage Swing High State Low State VIO IIB IIO AVOL GBW CMR PSR VOH VOL – – – 70 3.0 70 80 2.8 – 1.0 0.2 0 100 5.0 95 100 3.2 0.6 10 1.0 0.5 – – – – – 0.8 mV µA µA dB MHz dB dB V Vref Regline Regload Vref IO Vth 5.0 – – 4.9 25 3.8 5.1 1.0 1.0 – 100 4.3 5.2 20 20 5.3 190 4.8 V mV mV V mA V Symbol Min Typ Max Unit NOTES: 1. Maximum package power dissipation limits must be observed. 2. Adjust VCC above the Startup threshold before setting to 12 V. 3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Tlow = 0°C for the MC34067 Thigh = + 70°C for MC34067 = – 40°C for the MC33067 Thigh = + 85°C for MC33067 2 MOTOROLA ANALOG IC DEVICE DATA MC34067 MC33067 ELECTRICAL CHARACTERISTICS (VCC = 12 V [Note 2], ROSC= 18.2 k, RVFO = 2940, COSC = 300 pF, RT = 2370 k, CT = 300 pF, CL = 1.0 nF. For typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies [Note 3], unless otherwise noted.) Characteristic OSCILLATOR Frequency (Error Amp Output Low) TA = 25°C Total Variation (VCC = 10 to 18 V, TA = TLow to THigh Frequency (Error Amp Output High) TA = 25°C Total Variation (VCC = 10 to 18 V, TA = TLow to THigh Oscillator Control Input Voltage, Pin 3 @ 25°C ONE–SHOT Drive Output Off–Time TA = 25°C Total Variation (VCC = 10 to 18 V, TA = TLow to THigh DRIVE OUTPUTS Output Voltage Low State (ISink = 20 mA) Low State (ISink = 200 mA) High State (ISource = 20 mA) High State (ISource = 200 mA) Output Voltage with UVLO Activated (VCC = 6.0 V, ISink = 1.0 mA) Output Voltage Rise Time (CL = 1.0 nF) Output Voltage Fall Time (CL = 1.0 nF) FAULT COMPARATOR Input Threshold Input Bias Current (VPin 10 = 0 V) Propagation Delay to Drive Outputs (100 mV Overdrive) SOFT–START Capacitor Charge Current (VPin 11 = 2.5 V) Capacitor Discharge Current (VPin 11 = 2.5 V) UNDERVOLTAGE LOCKOUT Startup Threshold, VCC Increasing Enable/UVLO Adjust Pin Open Enable/UVLO Adjust Pin Connected to VCC Minimum Operating Voltage After Turn–On Enable/UVLO Adjust Pin Open Enable/UVLO Adjust Pin Connected to VCC Enable/UVLO Adjust Shutdown Threshold Voltage Enable/UVLO Adjust Input Current (Pin 9 = 0 V) TOTAL DEVICE Power Supply Current (Enable/UVLO Adjust Pin Open) Startup (VCC = 13.5 V) Operating (fOSC = 500 kHz) (Note 2) mA ICC – – 0.5 27 0.8 35 V Vth(UVLO) 14.8 8.0 8.0 7.6 6.0 – 16 9.0 9.0 8.6 7.0 – 0.2 17.2 10 V VCC(min) Vth(Enable) Iin(Enable) 10 9.6 – – 1.0 V mA Ichg Idischg 4.5 3.0 9.0 8.0 14 – µA mA Vth IIB tPLH(In/Out) 0.93 – – 1.0 – 2.0 60 1.07 – 10 100 V µA ns V VOL VOH VOL(UVLO) tr tf – – 9.5 9.0 – – – 0.8 1.5 10.3 9.7 0.8 20 15 1.2 2.0 – – 1.2 50 50 V ns ns ns tBlank 235 225 250 – 270 280 kHz fOSC(low) 500 490 1900 1850 – 525 – 2050 – 2.5 540 550 kHz fOSC(high) Vin 2150 2200 – V Symbol Min Typ Max Unit NOTES: 1. Maximum package power dissipation limits must be observed. 2. Adjust VCC above the Startup threshold before setting to 12 V. 3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Tlow = 0°C for the MC34067 Thigh = + 70°C for MC34067 = – 40°C for the MC33067 Thigh = + 85°C for MC33067 MOTOROLA ANALOG IC DEVICE DATA 3 MC34067 MC33067 Figure 1. Oscillator Timing Resistor versus Discharge Time ROSC, OSCILLATOR TIMING RESISTOR (kΩ ) 500 400 300 200 100 0 COSC = 200 pF COSC = 500 pF VCC = 12 V RVFO = ∞ RT = ∞ CT = 500 pF TA = 25°C Oscillator Discharge Time is Measured at the Drive Outputs. 0 40 60 80 tdischg, OSCILLATOR DISCHARGE TIME (µs) 20 100 f OSC , OSCILLATOR FREQUENCY (kHz) COSC = 300 pF 3500 3000 2500 2000 COSC = 300 pF 1500 1000 500 0 0 400 800 1200 1600 IOSC, OSCILLATOR CONTROL CURRENT (mA) 2000 Figure 2. Oscillator Frequency versus Oscillator Control Current VCC = 12 V TA = 25°C ROSC = 18.2 k Figure 3. Error Amp Output Saturation Voltage versus Oscillator Control Current Vsat, OUTPUT SATURATION VOLTAGE (V) 0.35 0.30 0.25 0.20 0.15 0.10 0.05 60 Figure 4. One–Shot Timing Resistor versus Period VCC = 12 V COSC = 500 pF ROSC = 100 k TA = 25°C CT = 300 pF 10 400 One–Shot Period is Measured at the Drive Outputs. 0.3 0.6 1.0 3.0 tOS, ONE–SHOT PERIOD (µs) 6.0 10 RT, TIMING RESISTOR (k Ω ) 30 20 CT = 200 pF CT = 500 pF 0 0.5 1.0 1.5 2.0 2.5 IOSC, OSCILLATOR CONTROL CURRENT (mA) 3.0 3.0 0.1 A VOL, OPEN LOOP VOLTAGE GAIN (dB) 50 40 30 20 10 0 –10 – 20 10 k Phase Phase Margin = 64° Gain VCC = 12 V VO = 2.0 V RL = 100 k TA = 25°C 50 0, EXCESS PHASE (DEGREES) 60 70 80 90 100 110 120 10M V ref , REFERENCE OUTPUT VOLTAGE CHANGE (mV) Figure 5. Open Loop Voltage Gain and Phase versus Frequency Figure 6. Reference Output Voltage Change versus Temperature 0 – 10 – 20 – 30 – 40 – 50 – 55 *Vref = 5.0 V – 25 0 25 50 75 TA, AMBIENT TEMPERATURE (°C) 100 125 *Vref = 5.0 V *Vref = 5.0 V VCC = 12 V RL = ∞ *Vref at TA = 25°C 100 k 1.0M f, FREQUENCY (Hz) ∇ 4 MOTOROLA ANALOG IC DEVICE DATA MC34067 MC33067 V ref , REFERENCE OUTPUT VOLTAGE CHANGE (mV) Figure 7. Reference Voltage Change versus Source Current V sat , OUTPUT SATURATION VOLTAGE (V) 0 TA = – 40°C –10 – 20 – 30 – 40 – 50 VCC = 12 V TA = – 20°C TA = –125°C 0 –1.0 – 2.0 – 3.0 3.0 2.0 1.0 0 0 Figure 8. Drive Output Saturation Voltage versus Load Current VCC TA = 25°C TA = – 40°C Source Saturation (Load to Ground) VCC = 12 V 80 µs Pulsed Load 120 Hz Rate TA = – 40°C TA = 25°C Source Saturation (Load to VCC) 0.2 Gnd 1.0 0 40 60 80 Iref, REFERENCE SOURCE CURRENT (mA) 20 100 0.4 0.6 0.8 IO, OUTPUT LOAD CURRENT (A) V OL , SOFT–START SATURATION VOLTAGE (V) I CC, SUPPLY CURRENT (mA) f, FREQUENCY (kHz) ∇ 90% 10% 2000 1600 1200 800 400 0 30 Figur