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UCC3882DW-1G4 Datasheet(PDF) 6 Page - Texas Instruments |
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UCC3882DW-1G4 Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 16 page  www.ti.com DAC INFORMATION UCC3882/-1 SLUS294A – MARCH 1999 – REVISED OCTOBER 2005 VDRVLO: This pin supplies power to the low side output and enables the GATELO output, forcing 0% output driver, GATELO. VDRVLO is typically duty cycle on the power supply. This pin is also used connected to a 12V source, but may be connected to by the foldback current limiting circuitry to indicate a 5V source for driving logic level MOSFETs. This pin when the output voltage has been short circuited. should be bypassed directly to PGND using a low VSNS should be decoupled very closely to the IC ESR capacitor. with a capacitor to GND. The OV and UV comparators’ hysteresis is typically 20mV, requiring VIN: This pin supplies power to the chip. Connect good layout and filtering techniques to insure that VIN to a stable voltage source that is at least 10.8V noise and ground-bounce do not inadvertently trip the above GND. The GATEHI, GATELO and PWRGD OV and UV comparators. It is recommended that an outputs will be held low until VCC exceeds the upper R-C filter set to approximately Fs/10 be used to filter undervoltage lockout threshold. This pin should be noise from the system output, where Fs is the bypassed directly to GND. oscillator frequency. VFB: This pin is the inverting input to the error amplifier. This input is connected to COMP through a feedback network and to the power supply output The 5-bit Digital-to-Analog Converter (DAC) is through a resistor or a divider network. programmed according to Table 1.The COMMAND VREF: This pin provides an accurate 5V reference voltage is always active as long as the UCC3882 VIN and is internally short circuit current limited. VREF pin is above the undervoltage lockout voltage. For the powers the D/A Converter and also provides a 3882, the output gate drives GATEHI and GATELO threshold voltage for the UVLO comparator. For best are disabled at certain DAC codes, as shown in reference stability, bypass VREF directly to GND with Table 1. Disabling the gate drives disables the power a low ESR, low ESL capacitor of at least 0.01 µF. supply. For the 3882 -1, the GATEHI and GATELO drives are enabled for all DAC codes. For a given VSNS: This pin is connected to the system output code, the power supply output regulates at the voltage through a low pass R-C filter. When the corresponding COMMAND voltage. voltage on VSNS rises above or falls below the COMMAND voltage by 9%, the PWRGD output is driven low to reset the microprocessor. When the voltage on VSNS rises above the COMMAND voltage by 17.5%, the OVP comparator disables the GATEHI Table 1. Programming the Command Voltage for the UCC3882 Digital Command Command GATEHI/GATELO Digital Command Command GATEHI/GATELO Voltage Status Voltage Status D4 D3 D2 D1 D0 D4 D3 D2 D1 D0 0 1 1 1 1 1.300 Note 1 ? 1 1 1 1 1 2.000 Note 1 ? 0 1 1 1 0 1.350 Note 1 ? 1 1 1 1 0 2.100 Enabled 0 1 1 0 1 1.400 Note 1 ? 1 1 1 0 1 2.200 Enabled 0 1 1 0 0 1.450 Note 1 ? 1 1 1 0 0 2.300 Enabled 0 1 0 1 1 1.500 Note 1 ? 1 1 0 1 1 2.400 Enabled 0 1 0 1 0 1.550 Note 1 ? 1 1 0 1 0 2.500 Enabled 0 1 0 0 1 1.600 Note 1 ? 1 1 0 0 1 2.600 Enabled 0 1 0 0 0 1.650 Note 1 ? 1 1 0 0 0 2.700 Enabled 0 0 1 1 1 1.700 Note 1 ? 1 0 1 1 1 2.800 Enabled 0 0 1 1 0 1.750 Note 1 ? 1 0 1 1 0 2.900 Enabled 0 0 1 0 1 1.800 Enabled 1 0 1 0 1 3.000 Enabled 0 0 1 0 0 1.850 Enabled 1 0 1 0 0 3.100 Enabled 0 0 0 1 1 1.900 Enabled 1 0 0 1 1 3.200 Enabled 0 0 0 1 0 1.950 Enabled 1 0 0 1 0 3.300 Enabled 0 0 0 0 1 2.000 Enabled 1 0 0 0 1 3.400 Enabled 0 0 0 0 0 2.050 Enabled 1 0 0 0 0 3.500 Enabled 6 |
Similar Part No. - UCC3882DW-1G4 |
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Similar Description - UCC3882DW-1G4 |
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