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UC1886 데이터시트(PDF) 1 Page - Texas Instruments |
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UC1886 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 8 page 6/98 Average Current Mode PWM Controller IC BLOCK DIAGRAM UC1886 UC2886 UC3886 UDG-95098-2 DESCRIPTION The UC3886 family of PWM controller ICs is designed for DC-to-DC con- verters with average current mode control. It is designed for use in con- junction with the UC3910 4-bit DAC and Voltage Monitor. The UC3886 drives an external N-channel MOSFET and can be used to power the In- tel Pentium® Pro and other high-end microprocessors. The UC3886 in conjunction with the UC3910 converts 5VDC to an adjust- able output ranging from 2.0V to 3.5V in 100mV steps with 35mV DC sys- tem accuracy. The oscillator is programmed by the user’s selection of an external resis- tor and capacitor, and is designed for 300kHz typical operation. The voltage and current amplifiers have 3.5MHz gain-bandwidth product to satisfy high performance system requirements. The internal current sense amplifier permits the use of a low value current sense resistor, minimizing power loss. It has inputs and outputs accessi- ble to allow user-selection of gain-setting resistors, and is internally com- pensated for a gain of 5 and above. The command voltage input is buffered and provided for use as the reference for the current sense am- plifier. The output of the voltage amplifier (input to the current amplifier) is clamped to 1 volt above the command voltage to serve as a current limit. The gate output can be disabled by bringing the CAO/ENBL pin to below 0.8 volts. FEATURES • 10.3V - 20V Operating Range • Low Offset Voltage Amplifier • High Bandwidth Current and Voltage Amplifiers • Low Offset Current Sense Amplifier • Undervoltage Lockout • Trimmed 5 Volt Reference • Externally Programmable Oscillator Charge Current • 1.5A Peak Totem Pole Output • Available in 16-pin DIL or SOIC Packages |
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