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IRU1150CS Datasheet(PDF) 4 Page - International Rectifier |
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IRU1150CS Datasheet(HTML) 4 Page - International Rectifier |
4 / 6 page 4 Rev. 1.6 03/18/02 IRU1150 www.irf.com APPLICATION INFORMATION Introduction The IRU1150 adjustable regulator is a five-terminal de- vice designed specifically to provide extremely low drop- out voltages comparable to the PNP type without the disadvantage of the extra power dissipation due to the base current associated with PNP regulators. This is done by bringing out the control pin of the regulator that provides the base current to the power NPN and con- necting it to a voltage that is grater than the voltage present at the VIN pin. This flexibility makes the IRU1150 ideal for applications where dual inputs are available such as a computer mother board with an ATX style power sup- ply that provides 5V and 3.3V to the board. One such application is the new graphic chip sets that require any- where from 2.4V to 2.7V supply such as the Intel I740 chip set. The IRU1150 can easily be programmed with the addition of two external resistors to any voltages within the range of 1.25 to 5.5 V. Another major require- ment of these graphic chips such as the Intel I740 is the need to switch the load current from zero to several amps in tens of nanoseconds at the processor pins, which translates to an approximately 300 to 500ns of current step at the regulator. In addition, the output voltage tol- erances are also extremely tight and they include the transient response as part of the specification. The IRU1150 is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer number of output capacitors. Another fea- ture of the device is its true remote sensing capability which allows accurate voltage setting at the load rather than at the device. Output Voltage Setting The IRU1150 can be programmed to any voltages in the range of 1.25V to 5.5V with the addition of R1 and R2 external resistors according to the following formula: Where: VREF = 1.25V Typically IADJ = 50 mA Typically R1 and R2 as shown in Figure 3: Figure 3 - Typical application of the IRU1150 for programming the output voltage. BLOCK DIAGRAM Figure 2 - Simplified block diagram of the IRU1150. VOUT = VREF 3 oo1 + pp+ I ADJ 3 R2 R2 R1 VCTRL VIN VSENSE Adj VOUT THERMAL SHUTDOWN CURRENT LIMIT 1.25V + + 5 4 3 1 2 VOUT R1 R2 VIN VCTRL VREF IADJ = 50uA IRU1150 VSENSE Adj VOUT VCTRL VIN |
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