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PT5405 Datasheet(PDF) 8 Page - Texas Instruments |
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PT5405 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 16 page Application Notes For technical support and further information, visit http://power.ti.com Using the Inhibit Control of the PT5400 SWIFT™ Series of Power Modules For applications requiring output voltage On/Off control, the PT5400 series of SWIFT power modules incorporate an inhibit function. This function can be used wherever there is a requirement for the module to be switched off. The On/Off function is provided by the Inhibit (pin 1) control. The ISR functions normally with Pin 1 open-circuit, providing a regulated output whenever a valid source voltage is applied to Vin, (pin 2). When a low-level2 ground signal is applied to pin 1, the regulator output will be disabled. Figure 3-1 shows an application schematic, which details the typical use 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 required to control this input 1. The Inhibit pin control thresholds are given in Table 3-1. Table 3-1; Inhibit Control Requirements Parameter Min Max Enable (VIH)Vin – 0.5 Open Disable (VIL) –0.2V +0.5V Notes: 1. Use an open-collector device (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 +0.5VDC. Figure 3-1 Turn-On Time: In the circuit of Figure 3-1, turning Q1 on applies a low-voltage to the Inhibit control (pin 1) and disables the regulator output. Correspondingly, turning Q1 off allows the ISR to execute a soft-start power up. The soft-start power up consists of a short delay, td, followed by a period, t(SS), in which the output voltage rises from zero to its full regulation voltage. (See the section on Soft-Start Power Up). The module produces a fully regulated output voltage within 25msec. Figure 3-2 shows the typical rise in both output voltage and input current for a PT5404 (1.8V), following the turn-off of Q1. The turn off of Q1 corresponds to the drop in the Q1 Vgs waveform. The time periods, td and t(SS), are indicated. The waveforms were measured with a 5Vdc input voltage, and 0.7- Ω resistive load. Figure 3-2 C 1 100 µF +V O COM +V IN COM Inhibit Q1 BSS138 PT5401 2 13 4 Vi n Vo GND INH t (SS) d t Vout (1V/Div) Iin (0.5A/Div) HORIZ SCALE: 5ms/Div Q1 Vgs (10V/Div) PT5400 Series |
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