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PTH05050WAS Datasheet(PDF) 4 Page - Texas Instruments |
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PTH05050WAS Datasheet(HTML) 4 Page - Texas Instruments |
4 / 22 page www.ti.com DEVICE INFORMATION Rset + 10 kW 0.8 V Vout * 0.8 V *2.49 kW PTHXX050 (Top View) 1 5 2 3 4 6 PTH05050W SLTS213D – MAY 2003 – REVISED JUNE 2007 Terminal Functions TERMINAL DESCRIPTION NAME NO. Vin 3 The positive input voltage power node to the module, which is referenced to common GND. Vout 6 The regulated positive power output with respect to the GND node. This is the common ground connection for the Vin and Vout power connections. It is also the 0 VDC reference for GND 1 the control inputs. A 0.05 W 1% resistor must be directly connected between this pin and (GND) to set the output voltage to a value higher than 0.8 V. The temperature stability of the resistor should be 100 ppm/ °C (or better). The set point range for the output voltage is from 0.8 V to 3.6 V. The resistor value required for a given output voltage may be calculated from the following formula. If left open circuit, the output voltage will default to its lowest value. For further information on output voltage adjustment consult the related application note. Vo Adjust 5 The specification table gives the preferred resistor values for a number of standard output voltages. The Inhibit pin is an open-collector/drain negative logic input that is referenced to GND. Applying a low-level ground signal to this input disables the module’s output and turns off the output voltage. When the Inhibit control is Inhibit(1) 4 active, the input current drawn by the regulator is significantly reduced. If the Inhibit pin is left open-circuit, the module will produce an output whenever a valid input source is applied. This is an analog control input that enables the output voltage to follow an external voltage. This pin becomes active typically 20 ms after the input voltage has been applied, and allows direct control of the output voltage from 0 V up to the nominal set-point voltage. Within this range the output will follow the voltage at the Track pin on a Track 2 volt-for-volt basis. When the control voltage is raised above this range, the module regulates at its set-point voltage. The feature allows the output voltage to rise simultaneously with other modules powered from the same input bus. If unused, this input should be connected to Vin. Note: Due to the under-voltage lockout feature, the output of the module cannot follow its own input voltage during power up. For more information, consult the related application note. (1) Denotes negative logic: Open = Normal operation Ground = Function active 4 Submit Documentation Feedback |
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