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L4913ADIE2V Datasheet(PDF) 10 Page - STMicroelectronics |
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L4913ADIE2V Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 19 page Application information RHFL4913 10/19 7 Application information To adjust the output voltage, the R2 resistor must be connected between the VO and ADJ pins. The R1 resistor must be connected between ADJ and ground. Resistor values can be derived from the following formula: VO = VADJ (R1+ R2) / R1 The VADJ is 1.23 V, controlled by the internal temperature-compensated band gap block. The minimum output voltage is therefore 1.22 V and minimum input voltage is 3 V. The RHFL4913 adjustable is functional as soon as the VI - VO voltage difference is slightly above the power element saturation voltage. The adjust pin to ground resistor value must not be greater than 10 k Ω, in order to keep the output feedback error below 0.2%. A minimum of 0.5 mA IO must be set to ensure perfect no-load regulation. It is advisable to dissipate this current into the divider bridge resistor. All available VI pins, as well as all available VO pins, should always be externally interconnected, otherwise the stability and reliability of the device cannot be guaranteed. The inhibit function switches off the output current electronically, and therefore very quickly. According to Lenz’s Law, external circuitry reacts with LdI/dt terms which can be of high amplitude in case somewhere a serial coil inductance exists. Large transient voltage would develop on both device terminals. It is advisable to protect the device with Schottky diodes to prevent negative voltage excursions. In the worst case, a 14 V Zener diode could protect the device input. The device has been designed for high stability and low dropout operation. Therefore, tantalum input and output capacitors with a minimum 1 µF are mandatory. Capacitor ESR range is from 0.5 Ω to over 20 Ω. This range is useful when ESR increases at low temperature. When large transient currents are expected, larger value capacitors are necessary. In the case of high current operation with short circuit events expected, caution must be exercised with regard to capacitors. They must be connected as close as possible to the device terminals. As some tantalum capacitors may permanently fail when subjected to high charge-up surge currents, it is recommended to decouple them with 470 nF polyester capacitors. Since the RHFL4913 adjustable voltage regulator is manufactured with very high speed bipolar technology (6 GHz fT transistors), the PCB layout must be designed with exceptional care, with very low inductance and low mutually coupling lines. Otherwise, high frequency parasitic signals may be picked up by the device resulting in system self-oscillation. The benefit is an SVR performance extended to far higher frequencies. 7.1 Notes on the 16-pin hermetic package The bottom section of the 16-pin package is metallized in order to allow the user to directly solder the RHFL4913 onto the equipment heat sink for enhanced heat removal. 7.2 Remote sensing operation A separate kelvin voltage sensing line provides the ADJ pin with exact load "high potential" information (see Figure 3) . But variable remote load current consumption induces variable Iq current (Iq is roughly the IO current divided by the hFE of the internal PNP series power element) routed through the parasitic series line resistor RW2. To compensate for this |
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