Pinout
Specifications
| Rating |
Symbol |
Value |
Unit |
| Power Supply Voltage |
VCC |
20 |
V |
Drive Output Current, Source or Sink (Note 1)
Continuous
Pulsed (0.5 ms, 25% Duty Cycle |
IO |
0.3
1.5
|
A |
Error Amplifier, Fault, OneShot, Oscillator and
SoftStart Inputs |
Vin |
1.0 to + 6.0 |
V |
| UVLO Adjust Input |
Vin(UVLO) |
1.0 to VCC |
V |
Power Dissipation and Thermal Characteristics
DW Suffix, Plastic Package, Case 751G
TA = 25°C
Thermal Resistance, JunctiontoAir
P Suffix, Plastic Package, Case 648
TA = 25°C
Thermal Resistance, JunctiontoAir |
PD
RqJA
PD
RqJA |
862
145
1.25
100 |
mW
°C/W
W
°C/W |
| Operating Junction Temperature |
TJ |
+ 150 |
°C |
Operating Ambient Temperature
MC34067
MC33067 |
TA |
0 to + 70
40 to + 85 |
°C |
| Storage Temperature |
Tstg |
55 to + 150 |
°C |
DescriptionThe 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. MC34067/MC33067 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. MC34067/MC33067 are available in dual-in-line and surface mount packages.
The features of MC34067/MC33067 can be summarized as (1)zero voltage switch resonant mode operation; (2)variable frequency oscillator with a control range exceeding 1000:1; (3)precision one-shot timer for controlled off-time; (4)internally trimmed bandgap reference; (5)4.0 MHz error amplifier; (6)dual high current totem pole outputs; (7)selectable undervoltage lockout thresholds with hysteresis; (8)enable input; (9)programmable soft-start circuitry; (10)low startup current for off-line operation.
The absolute maximum ratings of MC34067/MC33067 are (1)power supply voltage VCC: 20 V; (2)drive output current, source or sink (Note 1) continuous/pulsed (0.5 s, 25% Duty Cycle, IO: 0.3/1.5A; (3)error amplifier, fault, one-shot, oscillator and soft-start inputs, Vin : -1.0 to + 6.0V; (4)UVLO adjust input, Vin(UVLO): -1.0 to VCC V; (5)power dissipation and thermal characteristics(DW suffix, plastic package, case 751G TA = 25°C/thermal resistance, junction-to-air, PD/RJA: 862mW/145°C/W \ P Suffix, plastic package, Case 648; (6)TA = 25°C/ thermal resistance, junction-to-air, PD/RJA: 1.25mW/100°C/W); (7)operating junction temperature TJ: + 150 °C; (8)operating ambient temperature MC34067/MC33067, TA: 0 to +70/-40 to +85°C; (9)storage temperature Tstg :-55 to + 150 °C.
MC34067 Data Sheet
