Features: • Unique Oscillator for Precise Duty Cycle Limit and Frequency Control
• Current Mode Operation to 500 kHz
• Automatic Feed Forward Compensation
• Separate Latching PWMs for CycleByCycle Current Limiting
• Internally Trimmed Reference with Undervoltage Lockout
• Drive Output 2 Enable Pin
• Two High Current Totem Pole Outputs
• Input Undervoltage Lockout with Hysteresis
• Low Startup and Operating Current
Pinout
Specifications
|
Rating |
Symbol |
Value |
Unit |
| Power Supply Voltage |
VCC |
20 |
V |
| Output Current, Source or Sink (Note 1) |
IO |
400 |
mA |
| Output Energy (Capacitive Load per Cycle) |
W |
5.0 |
J |
| Current Sense, Enable, and Voltage Feedback Inputs |
Vin |
0.3 to +5.5 |
V |
Sync Input
High State (Voltage)
Low State (Reverse Current) |
VIH
IIL |
+5.5
5.0 |
+5.5
5.0 |
| Error Amp Output Sink Current |
IO |
10 |
mA |
Power Dissipation and Thermal Characteristics
DW Suffix, Plastic Package Case 751G
Maximum Power Dissipation @ TA = 25
Thermal Resistance, JunctiontoAir
P Suffix, Plastic Package Case 648
Maximum Power Dissipation @ TA = 25
Thermal Resistance, JunctiontoAir |
PD
RJA
PD
RJA |
862
145
1.25
100 |
mW
/W
mW
/W |
| Operating Junction Temperature |
TJ |
+150 |
|
Operating Ambient Temperature (Note 3)
MC34065
MC33065 |
TA |
0 to +70
40 to +85 |
|
| Storage Temperature Range |
Tstg |
65 to +150 |
|
DescriptionThe MC34065H,L series are high performance, fixed frequency, dual current mode controllers. They are specifically designed for offline and dctodc converter applications offering the designer a cost effective solution with minimal external components. MC34065H,L feature a unique oscillator for precise duty cycle limit and frequency control, a temperature compensated reference, two high gain error amplifiers, two current sensing comparators, Drive Output 2 Enable pin, and two high current totem pole outputs of MC34065H,L ideally suited for driving power MOSFETs.
MC34065H,L include protective features consisting of input and reference undervoltage lockouts each with hysteresis, cyclebycycle current limiting, and a latch for single pulse metering of each output. MC34065H,L are available in dualinline and surface mount packages.
The MC34065H has UVLO thresholds of 14 V (on) and 10 V (off), ideally suited for offline converters. The MC34065L is tailored for lower voltage applications having UVLO thresholds of 8.4 V (on) and 7.8 V (off).
MC34065-H,L Data Sheet
