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UC3-3 датащи(PDF) 4 Page - Texas Instruments |
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UC3-3 датащи(HTML) 4 Page - Texas Instruments |
4 / 6 page 4 UC182-1,-2,-3,-ADJ UC282-1,-2,-3,-ADJ UC382-1,-2,-3,-ADJ 1.6 1.7 1.8 1.9 01 23 IL (A) Figure 1. Typical Dropout (VB - VOUT), TJ = 27°C 100 200 300 400 IL 100mA 1A 2A 3A Figure 2. Typical Dropout (VIN - VOUT), TJ = 27°C 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 non-inverting operational amplifier. The resistors should meet the criteria of R3 || R4 < 100 Ω. Connect ADJ to VOUT for an output voltage of 1.2V. 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 collector of the output power transistor. The 2V 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 100mV for light loads; maximum dropout is 450mV at 3A for TJ = 0°C to +110°C. (Dropout is derated for junction temperatures over 110°C.) At full load, the majority of the VB current is going to the load. 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 througha5pin package, care must be taken since voltage drops along wire traces add to the dropout voltage. The UC382 is easy to use. The adjustable version re- quires two 0.1% resistors to set the output voltage. The fixed versions of the UC382 require no external resistors. All versions of the UC382 require decoupling capacitors on the input and output. In a typical application, VB and VIN are driven from switching power supplies which may have large filter capacitors at their outputs. If the UC382 is further than 12 inches from the power supply, it is rec- ommended to add local decoupling as close as possible to the linear regulator. Decouple the output of the UC382 with at least 100 µFof high quality tantalum or Sanyo OSCON capacitors close to the VOUT pin for maximum stability. Many applications involving ultra fast GTL or BTL applications require addi- tional capacitance close to the load. The exact amount will vary according to speed and magnitude of the load transients and the tolerance allowed for transients on VOUT. When specifying the decoupling capacitors, the series resistance of the capacitor bank is an important factor in its ability to filter load transients. The UC382 allows for Kelvin sensing the voltage at the load. This improves regulation performance and elimi- nates the voltage drops due to wire trace resistance. This voltage drop must be added to the headroom (VIN to VOUT and VB to VOUT). The dropout of 450mV is mea- sured at the pins and does not include additional drops due to trace resistance. The minimum load current is 10mA. Two or more UC382’s may be used in parallel. While sta- ble, this arrangement does degrade the transient re- sponse. APPLICATION INFORMATION |
Аналогичный номер детали - UC3-3 |
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Аналогичное описание - UC3-3 |
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