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PT5810 Datasheet(PDF) 7 Page - Texas Instruments |
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PT5810 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 11 page For technical support and more information, see inside back cover or visit www.ti.com Application Notes Using the Inhibit Control of the PT5800 & PT5810 Series of Step-Down ISRs For applications requiring output voltage On/Off control, the PT5800 & PT5810 series of ISRs incorporate an inhibit function. This function can be used wherever there is a requirement for the output voltage from the ISR to be turned off. The On/Off function is provided by the Inhibit* control (pin 2). The ISR functions normally with pin 2 open-circuit, providing a regulated output whenever a valid source voltage is applied between Vin (pins 5–7) and GND (pins 9–13). When a low-level ground signal is applied to pin 2, the regulator output is turned off 2. Figure 4-1 shows the typical application of the Inhibit* function. Note the discrete transistor (Q1). The Inhibit* control has its own internal pull-up to +Vin potential. An open-collector or open-drain device is recommended to control this input 1. The voltage thresholds are given in Table 4-1. Table 4-1; Inhibit Control Requirements Parameter Min Typ Max Enable (VIH)Vin – 0.5 V — Open Disable (VIL) –0.2 V — +0.6 V I IL — –0.2 mA — Notes: 1. Use an open-collector device with a breakdown voltage of at least 10 V (preferably a discrete transistor) for the Inhibit* input. A pull-up resistor is not necessary. To disable the output voltage the control pin should be pulled low to less than +0.8 VDC. 2. When a ground signal is applied to the Inhibit* control (pin 2) the module output is turned off (tri-state). The output voltage decays to zero as the load impedance discharges the output capacitors. Figure 4-1 Turn-On Time: In the circuit of Figure 4-1, turning Q1 on applies a low-voltage to the Inhibit* control (pin 2) and disables the output of the regulator 2. If Q1 is then turned off, the ISR executes a soft-start power up. Power up consists of a short delay (approx. 2msec), followed by a period in which the output voltage rises to its full regu- lation voltage. The module produces a regulated output voltage within 10msec. Figure 4-2 shows the typical rise in both the output voltage and input current for a PT5812 (2.5 V), following the turn-off of Q1. The turn off of Q1 corresponds to the rise in the waveform, Q1 Vds. The waveforms were measured with a 3.3 VDC input voltage, and 10-A load. Figure 4-2 Vo (1V/Div) Iin (5A/Div) Q1 Vds (2V/Div) HORIZ SCALE: 2ms/Div PT5800 & PT5810 Series V IN C IN 1,000 µF C OUT 330 µF 1 =Inhibit GND GND V OUT Output Sense (+) Output Sense (–) Q 1 BSS138 PT5812 9–13 4 118 14–17 5, 6, 7 8 2 3 |
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