MC34025 |
RFQ for MC34025 Required Field |
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| Product | Manufacturers | Pack | D/C |
| MC34025 | - | - | 01+ |
The MC34025 series are high speed, fixed frequency, doubleended pulse width modulator controllers optimized for high frequency operation. They are specifically designed for OffLine and DCtoDC converter applications offering the designer a cost effective solution with minimal external components. These integrated circuits feature an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high speed current sensing comparator, steering flipflop, and dual high current totem pole outputs ideally suited for driving power MOSFETs.
Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cyclebycycle current limiting, and a latch for single pulse metering.
The flexibility of this series allows it to be easily configured for either current mode or voltage mode control.
Features |
| • 50 ns Propagation Delay to Outputs• Dual High Current Totem Pole Outputs• Wide Bandwidth Error Amplifier• FullyLatched Logic with Double Pulse Suppression• Latching PWM for CycleByCycle Current Limiting• SoftStart Control with Latched Overcurrent Reset• Input Undervoltage Lockout with Hysteresis• Low StartUp Current (500 A Typ)• Internally Trimmed Reference with Undervoltage Lockout• 90% Maximum Duty Cycle (Externally Adjustable)• Precision Trimmed Oscillator• Voltage or Current Mode Operation to 1.0 MHz• Functionally Similar to the UC3825 |
|
Rating |
Symbol |
Value |
Unit |
| Power Supply Voltage |
VCC |
30 |
V |
| Output Driver Supply Voltage |
VC |
20 |
V |
| Output Current, Source or Sink (Note 1) DC Pulsed (0.5 s) |
IO |
0.5 2.0 |
A |
| Current Sense, SoftStart, Ramp, and Error Amp Inputs |
Vin |
0.3 to +7.0 |
V |
| Error Amp Output and SoftStart Sink Current |
IO |
10 |
mA |
| Clock and RT Output Current |
ICO |
5.0 |
mA |
| Power Dissipation and Thermal Characteristics SO16 Package (Case 751G) Maximum Power Dissipation @ TA = +25°C Thermal Resistance, JunctiontoAir DIP Package (Case 648) Maximum Power Dissipation @ TA = +25°C Thermal Resistance, JunctiontoAir |
PD RJA PD RJA |
862 145 1.25 100 |
mW /W W /W |
Operatin
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