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UC285TD-3 Fiches technique(PDF) 4 Page - Texas Instruments |
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UC285TD-3 Fiches technique(HTML) 4 Page - Texas Instruments |
4 / 13 page UC2851, UC2852, UC2853, UC285ADJ, UC3851, UC3852, UC3853, UC385ADJ FAST TRANSIENT RESPONSE 5A LOW DROPOUT REGULATOR SLUS212E − NOVEMBER 1999 − REVISED FEBRUARY 2004 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 pin descriptions ADJ: In the adjustable version, the user programs the output voltage with two external resistors. The resistors should be 0.1% for high accuracy. The output amplifier is configured as a noninverting operational amplifier. The resistors should meet the criteria of R3 || R4 < 100 Ω. Connect ADJ to VOUT for an output voltage of 1.2 V. Note that the point at which the feedback network is connected to the output is the Kelvin sense point. GND: For accurate results, the GND pin should be referenced to the load ground. VB: Supplies power to all circuits of the regulator except the output power transistor. The 2-V headroom from VB to VOUT allows the use of a Darlington output stage for inherently low output impedance and fast response. (Dropout is derated for junction temperatures below 0 °C.) VIN: Supplies the current to the collector of the output power transistor only. The dropout (VIN-VOUT) is under 100 mV for light loads; maximum dropout is 490 mV at 5 A for TJ = 0°C to 100°C. (Dropout is derated for junction temperatures over 100 °C.) VOUT: This pin should be connected to the load via a low impedance path. Avoid connectors which add significant inductance and resistance. Note that even though a Kelvin sense is available through a 5-pin package, care must be taken since voltage drops along wire traces add to the dropout voltage. Figure 1 DROPOUT VOLTAGE (VB − VOUT) vs. LOAD CURRENT 1.6 1.7 0 5 4 3 2 1 1.625 1.65 1.675 IL− Load Current − A TJ = 27°C Figure 2 DROPOUT VOLTAGE (VIN − VOUT) vs. LOAD CURRENT 100 200 300 400 100m 5 IL− Load Current − A TJ = 27°C |
Numéro de pièce similaire - UC285TD-3 |
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Description similaire - UC285TD-3 |
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