Features: • Trimmed Oscillator for Precise Frequency Control• Oscillator Frequency Guaranteed at 250 kHz• Current Mode Operation to 500 kHz• Automatic Feed Forward Compensation• Latching PWM for Cycle−By−Cycle Current Limiting• Internally Trimmed Ref...
UC3843B: Features: • Trimmed Oscillator for Precise Frequency Control• Oscillator Frequency Guaranteed at 250 kHz• Current Mode Operation to 500 kHz• Automatic Feed Forward Compensati...
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Rating | Symbol | Value | Unit |
Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) | VCC, VC | 30 | V |
Total Power Supply and Zener Current | (ICC + IZ) | 30 | mA |
Output Current, Source or Sink | IO | 1.0 | A |
Output Energy (Capacitive Load per Cycle) | W | 5.0 | J |
Current Sense and Voltage Feedback Inputs | Vin | − 0.3 to + 5.5 | V |
Error Amp Output Sink Current | IO | 10 | mA |
Power Dissipation and Thermal Characteristics D Suffix, Plastic Package, SOIC−14 Case 751A Maximum Power Dissipation @ TA = 25 Thermal Resistance, Junction−to−Air D1 Suffix, Plastic Package, SOIC−8 Case 751 Maximum Power Dissipation @ TA = 25 Thermal Resistance, Junction−to−Air N Suffix, Plastic Package, Case 626 Maximum Power Dissipation @ TA = 25 Thermal Resistance, Junction−to−Air |
PD RJA PD RJA PD RJA |
862 145 702 178 1.25 100 |
mW /W mW /W W /W |
Operating Junction Temperature | TJ | +150 | |
Operating Ambient Temperature UC3842B, UC3843B UC2842B, UC2843B UC3842BV, UC3843BV NCV3843BV |
TA | 0 to 70 − 25 to + 85 −40 to +105 −40 to +125 |
|
Storage Temperature Range | Tstg | − 65 to +150 |
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional peration above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the ecommended Operating Conditions may affect device reliability.
The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off−Line and DC−DC converter applications offering the designer a cost−effective solution with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle−by−cycle current limiting, programmable output deadtime, and a latch for single pulse metering.
These devices are available in an 8−pin dual−in−line and surface mount (SOIC−8) plastic package as well as the 14−pin plastic surface mount (SOIC−14). The SOIC−14 package has separate power and ground pins for the totem pole output stage.
The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off−line converters. The UCX843B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).