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UCC3882DW-1 Datasheet(PDF) 8 Page - Texas Instruments |
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UCC3882DW-1 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 16 page  www.ti.com UDG−97048−1 VCCP 5 VIN C1 1500 µF C2 1500 µF C3 1500 µF C20 1500 µF Q1 IRL3103 C4 4.7 µF Q2 IRL3103D1 L1 1.6 µH R9 3.3 Ω R10 3.3 Ω R1 0.005 Ω C5 1500 µF C6 1500 µF C7 1500 µF C8 1500 µF C9 1500 µF C10 0.1 µF R2 10 K Ω C14 0.01 µF VREF R8 10 K Ω C18 1500 pF C19 220 pF R7 5.6 K Ω C11 0.1 µF RT 10 k Ω CT 3900 pF F SWITCH = 225 kHz R3 5.62 K Ω R5 365 k Ω C17 68 pF R6 100 K Ω C13 0.01 µF C12 0.01 µF C15 0.1 µF PWRGD 12 VIN VID0 VID1 VID2 VID3 VID4 ISHARE OUTEN U1 GND D0 D1 NC D2 D3 D4 COMMAND VCRV1 GATE1 EN COMP VFB UCC3882 VSNS PWRGD NC CAM CAO ISOUT IS+ IS− VIN VDRV2 GATE2 PGND RT CT 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 ISC + 1.37 V RSENSE 16 (1) RSENSE + 1.37 V ISC 16 (2) UCC3882/-1 SLUS294A – MARCH 1999 – REVISED OCTOBER 2005 Figure 1. Application Circuit – Pentium® II Power Supply The UCC3882 incorporates short circuit current Choosing R SENSE to Set the Current Limit foldback, as shown in Figure 6. When the output of the power supply is short circuited, the output voltage RSENSE is chosen to limit the maximum (short circuit) falls. When the output voltage reaches 1/2 of its current of the power supply. The short circuit current nominal voltage (COMMAND/ 2) then the output equation for the UCC3882 is: current is reduced. This feature reduces the amount of current in the MOSFETs and capacitors, and insures high reliability. and therefore, the value of the sense resistor, for a chosen short circuit current is: The short circuit current limit does vary slightly as a function of the switching regulator’s output inductor value and operating frequency because a high value of ripple current will reduce the average short circuit current limit. Figure 5 shows the variation in Isc given common values for the UCC3882. The UCC3882 is nominally configured so that a 0.005 m Ω resistor will set the current limit to approximately 17A. 8 |
Similar Part No. - UCC3882DW-1 |
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Similar Description - UCC3882DW-1 |
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