Order this document by MC34066/D
High Performance
Resonant Mode Controllers
The MC34066/MC33066 are high performance resonant mode controllers designed for off±line and dc±to±dc converter applications that utilize frequency modulated constant on±time or constant off±time control. These integrated circuits feature a variable frequency oscillator with programmable deadtime, precision retriggerable one±shot timer, temperature compensated reference, high gain wide±bandwidth error amplifier with a precision output clamp, 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 and latch, 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.
•Variable Frequency Oscillator with a Control Range Exceeding 1000:1
•Programmable Oscillator Deadtime Allows Constant Off±Time Operation
•Precision Retriggerable One±Shot Timer
•Internally Trimmed Bandgap Reference
•5.0 MHz Error Amplifier with Precision Output Clamp
•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
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Simplified Block Diagram |
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VCC |
15 |
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Enable/ |
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Reference |
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VCC UVLO |
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Vref |
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UVLO Adjust |
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Regulator |
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Osc |
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Variable |
Vref UVLO |
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Gnd |
Deadtime |
1 |
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Osc RC |
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Frequency |
Aout |
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Drive |
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Oscillator |
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Osc Control 2 |
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14 Output A |
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Current 3 |
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Steering |
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One±Shot RC |
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One±Shot |
Flip±Flop |
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Drive |
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Bout |
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16 |
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12 Output B |
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Error Amp |
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Drive Gnd |
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Clamp |
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13 |
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Error Amp |
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Error |
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Out 6 |
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Error Amp + |
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Amplifier |
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8 |
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Soft±Start |
Fault±Detector/ |
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Fault Input |
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Error Amp ± |
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Latch |
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7 |
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CSoft±Start |
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11 |
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MC34066
MC33066
HIGH PERFORMANCE
RESONANT MODE
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
DW SUFFIX
PLASTIC PACKAGE
CASE 751G (SO±16L)
PIN CONNECTIONS
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Osc Deadtime |
1 |
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16 |
One±Shot RC |
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Osc RC |
2 |
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15 |
V |
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Osc Control |
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CC |
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3 |
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14 |
Drive Output A |
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Current |
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Gnd |
4 |
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13 |
Drive Gnd |
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Vref |
5 |
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12 |
Drive Output B |
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Error Amp Out |
6 |
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11 |
CSoft±Start |
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Error Amp |
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7 |
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10 |
Fault Input |
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Inverting Input |
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Enable/UVLO |
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Error Amp |
8 |
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9 |
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Noninverting Input |
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Adjust |
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(Top View)
ORDERING INFORMATION
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Operating |
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Device |
Temperature Range |
Package |
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MC34066DW |
TA = 0° to +70°C |
SO±16L |
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MC34066P |
Plastic DIP |
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MC33066DW |
TA = ± 40° to +85°C |
SO±16L |
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MC33066P |
Plastic DIP |
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Motorola, Inc. 1996 |
Rev 1 |
MC34066 MC33066
MAXIMUM RATINGS
Rating |
Symbol |
Value |
Unit |
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Power Input Supply Voltage |
VCC |
20 |
V |
Drive Output Current, Source or Sink (Note 1) |
IO |
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A |
Continuous |
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0.3 |
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Pulsed (0.5 μs, 25% Duty Cycle) |
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1.5 |
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Error Amplifier, Fault, One±Shot, Oscillator, and |
Vin |
±1.0 to +6.0 |
V |
Soft±Start Inputs |
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UVLO Adjust Input |
Vin(UVLO) |
±1.0 to VCC |
V |
Soft±Start Discharge Current |
Idchg |
20 |
mA |
Power Dissipation and Thermal Characteristics |
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DW Suffix Package, Case 751G |
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Maximum Power Dissipation @ TA = 25°C |
PD |
862 |
mW |
Thermal Resistance, Junction±to±Air |
RθJA |
145 |
°C/W |
P Suffix Package, Case 648 |
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Maximum Power Dissipation @ TA = 25°C |
PD |
1.25 |
W |
Thermal Resistance, Junction±to±Air |
RθJA |
100 |
°C/W |
Operating Junction Temperature |
TJ |
+150 |
°C |
Operating Ambient Temperature |
TA |
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°C |
MC34066 |
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0 to +70 |
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MC33066 |
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±40 to +85 |
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Storage Temperature Range |
Tstg |
±65 to +150 |
°C |
ELECTRICAL CHARACTERISTICS (VCC = 12 V [Note 2], ROSC = 95.3 k, RDT = 0 Ω, RVFO = 5.62 k, COSC = 300 pF, RT = 14.3 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.)
Characteristics |
Symbol |
Min |
Typ |
Max |
Unit |
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REFERENCE SECTION |
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Reference Output Voltage (IO = 0 mA, TA = 25°C) |
Vref |
5.0 |
5.1 |
5.2 |
V |
Line Regulation (VCC = 10 V to 18 V) |
Regline |
± |
1.0 |
20 |
mV |
Load Regulation (IO = 0 mA to 10 mA) |
Regload |
± |
1.0 |
20 |
mV |
Total Output Variation over Line, Load, and Temperature |
Vref |
4.9 |
± |
5.3 |
mV |
Output Short Circuit Current |
IO |
25 |
100 |
190 |
mA |
Reference Undervoltage Lockout Threshold |
Vth |
3.8 |
4.3 |
4.8 |
V |
ERROR AMPLIFIER |
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Input Offset Voltage (VCM = 1.5 V) |
VIO |
± |
1.0 |
10 |
mV |
Input Bias Current (VCM = 1.5 V) |
IIB |
± |
0.2 |
1.0 |
μA |
Input Offset Current (VCM = 1.5 V) |
IIO |
± |
0 |
0.5 |
μA |
Open Loop Voltage Gain (VCM = 1.5 V, VO = 2.0 V) |
AVOL |
70 |
100 |
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dB |
Gain Bandwidth Product (f = 100 kHz) |
GBW |
2.5 |
4.2 |
± |
MHz |
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Input Common Mode Rejection Ratio (VCM = 1.5 V to 5.0 V) |
CMRR |
70 |
95 |
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dB |
Power Supply Rejection Ratio (VCC = 10 V to 18 V, f = 120 Hz) |
PSRR |
80 |
100 |
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dB |
Output Voltage Swing |
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V |
High State with Respect to Pin 3 (ISource = 2.0 mA) |
VOH |
2.3 |
2.7 |
3.1 |
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Low State with Respect to Ground (ISink = 1.0 mA) |
VOL |
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0.4 |
0.6 |
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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 MC34066 |
Thigh = +70°C for MC34066 |
±40°C for MC33066 |
+85°C for MC33066 |
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MOTOROLA ANALOG IC DEVICE DATA |
MC34066 MC33066
ELECTRICAL CHARACTERISTICS (continued) (VCC = 12 V [Note 2], ROSC = 95.3 k, RDT = 0 Ω, RVFO = 5.62 k, COSC = 300 pF,
RT = 14.3 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.)
Characteristics |
Symbol |
Min |
Typ |
Max |
Unit |
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OSCILLATOR |
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Frequency (Error Amp Output Low) |
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fOSC(low) |
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kHz |
TA = 25°C |
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90 |
100 |
110 |
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Total Variation (VCC = 10 V to 18 V, TA = TLow to THigh) |
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85 |
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115 |
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Frequency (Error Amp Output High) |
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fOSC(high) |
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kHz |
TA = 25°C |
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900 |
1000 |
1100 |
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Total Variation (VCC = 10 V to 18 V, TA = TLow to THigh) |
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850 |
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1150 |
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Oscillator Control Input Voltage, Pin 3 (ISink = 0.5 mA, TA = 25°C) |
Vin |
1.3 |
1.4 |
1.5 |
V |
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Output Deadtime (Error Amp Output High) |
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DT |
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RDT = 0 Ω |
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70 |
100 |
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RDT = 1.0 k |
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600 |
700 |
800 |
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ONE±SHOT |
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Drive Output On±Time (RDT = 1.0 k) |
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tOS |
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μs |
TA = 25°C |
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1.43 |
1.5 |
1.57 |
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Total Variation (VCC = 10 V to 18 V, TA = TLow to THigh) |
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1.4 |
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1.6 |
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DRIVE OUTPUTS |
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Output Voltage |
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V |
Low State (ISink = 20 mA) |
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VOL |
± |
0.8 |
1.2 |
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(ISink = 200 mA) |
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1.5 |
2.0 |
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High State (ISource = 20 mA) |
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VOH |
9.5 |
10.3 |
± |
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(ISource = 200 mA) |
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9.0 |
9.8 |
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Output Voltage with UVLO Activated (VCC = 6.0 V, ISink = 1.0 mA) |
VOL(UVLO) |
± |
0.8 |
1.2 |
V |
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Output Voltage Rise Time (CL = 1.0 nF) |
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tr |
± |
20 |
50 |
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Output Voltage Fall Time (CL = 1.0 nF) |
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tf |
± |
20 |
50 |
ns |
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FAULT COMPARATOR |
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Input Threshold |
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Vth |
0.95 |
1.0 |
1.05 |
V |
Input Bias Current (VPin 10 = 0 V) |
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IIB |
± |
±2.0 |
±10 |
μA |
Propagation Delay to Drive Outputs (100 mV Overdrive) |
tPLH(In/Out) |
± |
60 |
100 |
ns |
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SOFT±START |
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Capacitor Charge Current (VPin 11 = 2.5 V) |
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Ichg |
4.5 |
8.1 |
14 |
μA |
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Capacitor Discharge Current (VPin 11 = 2.5 V) |
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IIdchg |
1.0 |
8.0 |
± |
mA |
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UNDERVOLTAGE LOCKOUT |
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Startup Threshold, VCC Increasing |
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Vth(UVLO) |
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V |
Enable/UVLO Adjust Pin Open |
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14.8 |
16 |
17.2 |
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Enable/UVLO Adjust Pin Connected to VCC |
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8.0 |
9.0 |
10 |
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Minimum Operating Voltage after Turn±On |
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VCC(min) |
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V |
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Enable/UVLO Adjust Pin Open |
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8.0 |
9.0 |
10 |
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Enable/UVLO Adjust Pin Connected to VCC |
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7.6 |
8.6 |
9.6 |
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Enable/UVLO Adjust Shutdown Threshold Voltage |
Vth(Enable) |
6.0 |
7.0 |
± |
V |
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Enable/UVLO Adjust Input Current (Pin 9 = 0V) |
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Iin(Enable) |
± |
±0.2 |
±1.0 |
mA |
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TOTAL DEVICE |
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Power Supply Current (Enable/UVLO Adjust Pin Open) |
ICC |
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mA |
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Startup (VCC = 13.5 V) |
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0.45 |
0.6 |
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Operating (fOSC = 100 kHz) (Note 2) |
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21 |
30 |
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NOTES: 2. Adjust VCC above the Startup threshold before setting to 12 V. |
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3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. |
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Tlow = 0°C for MC34066 |
Thigh = |
+70°C for MC34066 |
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±40°C for MC33066 |
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+85°C for MC33066 |
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MOTOROLA ANALOG IC DEVICE DATA |
3 |
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MC34066 MC33066
Figure 1. MC34066 Representative Block Diagram
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VCC |
15 |
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50k |
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7k |
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7k |
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Enable/ |
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+ |
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Reference |
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9 |
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50k |
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Vref |
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UVLO Adjust |
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Regulator |
5.1V |
Vref UVLO |
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5 |
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8V VCC UVLO |
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Gnd |
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UVLO |
± |
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4 |
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VCC |
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+ |
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Osc Deadtime |
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4.2V/4V |
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Q1 |
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RDT |
1 |
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Q2 |
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Steering |
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Drivers |
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5.1V |
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ROSC |
Osc RC |
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Oscillator |
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Flip±Flop |
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Drive |
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2 |
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+ |
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T |
Q |
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14 |
Output A |
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COSC |
IOSC |
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Q |
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4.9V/3.6V |
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Drive |
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One±Shot RC |
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ton |
R |
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12 |
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One±Shot |
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Output B |
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16 |
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Drive |
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± |
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R |
Osc Control |
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+ |
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13 |
Gnd |
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T |
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CT |
Current |
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4.9V/3.6V |
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3 |
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UVLO + Fault |
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R |
Fault |
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Q |
Comparator |
+ |
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Fault |
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Current Mirror |
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RVFO |
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S |
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10 |
Input |
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IOSC |
+ |
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Error Amp |
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Fault |
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± |
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Fault |
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± |
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Output Clamp |
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1.0V |
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Error Amp |
6 |
2.5V |
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EA Clamp |
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Latch |
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Output |
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Soft±Start |
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Error Amp |
7 |
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Inverting Input |
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± |
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Buffer |
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Error Amp |
8 |
+ |
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9μA |
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Noninverting Input |
Error |
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CSoft±Start |
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Amplifier |
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11 |
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OPERATING DESCRIPTION
Introduction
As power supply designers have strived to increase power conversion efficiency and reduce passive component size, high frequency resonant mode power converters have emerged as attractive alternatives to conventional square±wave control. When compared to square±wave converters, resonant mode control offers several benefits including lower switching losses, higher efficiency, lower EMI emission, and smaller size. This integrated circuit has been developed to support new trends in power supply design. The MC34066 Resonant Mode Controller is a high performance bipolar IC dedicated to variable frequency power control at frequencies exceeding 1.0 MHz. This integrated circuit provides the features, performance and flexibility for a wide variety of resonant mode power supply applications.
The primary purpose of the control chip is to supply precise pulses to the gates of external power MOSFETs at a repetition rate regulated by a feedback control loop. The MC34066 can be operated in any of three modes as follows: 1) fixed on±time, variable frequency; 2) fixed off±time, variable frequency; and 3) combinations of 1 and 2 that change from fixed on±time to fixed off±time as the frequency increases. Additional features of the IC ensure that system startup and fault conditions are administered in a safe, controlled manner.
A simplified block diagram of the IC is shown on the first page of this data sheet, which identifies the main functional blocks and the block±to±block interconnects. Figure 1 is a detailed functional diagram which accurately represents the internal circuitry. The various functions can be divided into two sections. The first section includes the primary control path which produces precise output pulses at the desired frequency Oscillator, a One±Shot, a pulse Steering Flip±Flop, a pair of power MOSFET Drivers, and a wide bandwidth Error Amplifier. The second section provides several peripheral support functions including a voltage reference, undervoltage lockout, Soft±Start circuit, and a fault detector.
Primary Control Path
The output pulse width and repetition rate are regulated through the interaction of the variable frequency Oscillator, One±Shot timer and Error Amplifier. The Oscillator triggers the One±Shot which generates a pulse that is alternately steered to a pair of totem±pole output drivers by a toggle Flip±Flop. The Error Amplifier monitors the output of the regulator and modulates the frequency of the Oscillator. High±speed Schottky logic is used throughout the primary control channel to minimize delays and enhance high frequency characteristics.
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MOTOROLA ANALOG IC DEVICE DATA |
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