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UCC3830DW-5 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC3830DW-5 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 10 page UCC3830-4/-5/-6 02/99 FEATURES • 5-Bit Digital-to-Analog Converter (DAC) • Supports 4-Bit and 5-Bit Microprocessor VID Codes • Combined DAC/Voltage Monitor and PWM Functions • 1% DAC/Reference • Current Sharing • 100kHz, 200kHz, 400kHz Oscillator Frequency Options • Foldback Current Limiting • Overvoltage and Undervoltage Fault Windows • Undervoltage Lockout • 4Ω Totem Pole Output • Chip Disable Function 5-Bit Microprocessor Power Supply Controller BLOCK DIAGRAM UDG-96188-2 DESCRIPTION The UCC3830-4/-5/-6 is a fully integrated single chip solution ideal for power- ing high performance microprocessors. The chip includes an average current mode PWM controller, has a fully integrated 5-Bit DAC, and includes an on-board precision reference and voltage monitor circuitry. The UCC3830-x converts 5VDC to an adjustable output, ranging from 3.5VDC down to 1.8VDC with 1% DC system accuracy (see Table 1). The UCC3830-x fully supports Intel’s 4-bit Pentium® Pro and 5-bit Pentium® II VID codes. The accuracy of the DAC/reference combination is 1%. The overvoltage and undervoltage comparators monitor the system output voltage and indicate when it rises above or falls below its programmed value by more than 8.5%. A second overvoltage protection comparator pulls the current amplifier output voltage low to force zero duty cycle when the system output voltage exceeds its designed value by more than 17.5%. This comparator also terminates the cycle. Undervoltage lockout circuitry assures the correct logic states at the outputs during powerup and powerdown. The gate output can be disabled by bringing the CAO/ENBL pin to below 0.8V. (continued) |
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