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UC2823 Folha de dados(PDF) 1 Page - Texas Instruments |
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UC2823 Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 7 page UC1823 UC2823 UC3823 High Speed PWM Controller FEATURES • Compatible with Voltage or Current-Mode Topologies • Practical Operation @ Switching Frequencies to 1.0MHz • 50ns Propagation Delay to Output • High Current Totem Pole Output (1.5A peak) • Wide Bandwidth Error Amplifier • Fully Latched Logic with Double Pulse Suppression • Pulse-by-Pulse Current Limiting • Soft Start/Max. Duty Cycle Control • Under-Voltage Lockout with Hysteresis • Low Start Up Current (1.1mA) • Trimmed Bandgap Reference (5.1V ±1%) DESCRIPTION The UC1823 family of PWM control ICs is optimized for high fre- quency switched mode power supply applications. Particular care was given to minimizing propagation delays through the compara- tors and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage-mode systems with the capability for input voltage feed-forward. Protection circuitry includes a current limit comparator, a TTL com- patible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jit- ter free operation and prohibit multiple pulses at the output. An un- der-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the output is high im- pedance. The current limit reference (pin 11) is a DC input voltage to the current limit comparator. Consult specifications for details. These devices feature a totem pole output designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is defined as a high level. BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS Supply Voltage (Pins 15, 13) . . . . . . . . . . . . . . . . . . . . . . . . 30V Output Current, Source or Sink (Pin14) DC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A Pulse (0.5 µs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0A Analog Inputs (Pins 1, 2, 7, 8, 9, 11) . . . . . . . . . . . -0.3V to +6V Clock Output Current (Pin 4) . . . . . . . . . . . . . . . . . . . . . . . -5mA Error Amplifier Output Current (Pin 3) . . . . . . . . . . . . . . . . 5mA Soft Start Sink Current (Pin 8) . . . . . . . . . . . . . . . . . . . . . 20mA Oscillator Charging Current (Pin 5) . . . . . . . . . . . . . . . . . . -5mA Power Dissipation at TA = 60 °C . . . . . . . . . . . . . . . . . . . . . 1W Storage Temperature Range . . . . . . . . . . . . . . -65°C to +150°C Lead Temperature (Soldering, 10 seconds) . . . . . . . . . . 300°C Note: All voltages are with respect to ground, Pin 10. Currents are positive into the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages. 3/97 1 |
Nº de peça semelhante - UC2823 |
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Descrição semelhante - UC2823 |
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