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PT6343C Datasheet(PDF) 4 Page - Texas Instruments |
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PT6343C Datasheet(HTML) 4 Page - Texas Instruments |
4 / 11 page For technical support and more information, see inside back cover or visit www.ti.com Application Notes Using the Inhibit Function on the PT6340 12V Bus Excalibur™ Series Converters The PT6340 series are high efficiency regulators that are designed to operate off a 12V input bus. These devices incorporate an inhibit function, which may be used in applications that require a power-up/shutdown feature. The inhibit function is provided by the Inhibit* control, pin 1. If pin 1 is left open-circuit the regulator operates normally, and provides a regulated output whenever a valid supply voltage is applied to Vin (pins 2– 4) with respect to GND (pins 5–8). If a low voltage 2 is then applied to pin 1 the regulator output will be disabled and the input current drawn by the ISR will typically drop to 0.5mA 4. The standby control may also be used to hold-off the regulator output during the period that input power is applied. The Inhibit* input can be controlled with an open-collector (or open-drain) discrete transistor (See Figure 1). The input is internally pulled-up to the input voltage, Vin 1. Table 1 gives the control voltage requirements. Table 1 Inhibit Control Requirements 3 Parameter Min Typ Max VIL -0.1V 0.6V VIH 2.0V Vin IIL 0.5mA Notes: 1. The inhibit control input requires no external pull-up resistor. The open-circuit voltage of the Inhibit* input is typically the input voltage, Vin. 2. The inhibit control input is Not compatible with TTL devices. An open-collector device, preferably a discrete bipolar transistor (or MOSFET) is recommended. To ensure the regulator output is disabled, the control pin must be pulled to less than 0.6Vdc with a low-level 0.5mA sink to ground. 3. An external source voltage can be used to control the Inhibit* pin. To guarantee the inhibit and enable status of the regulator, the source must be capable of meeting the voltage requirements in Table 1 . 4. When the regulator output is disabled the current drawn from the input source is typically reduced to 0.5mA. Figure 1 Turn-On Time: In the circuit of Figure 1, turning Q1 on applies a low voltage to the Inhibit* control (pin 1) and disables the regulator ouput. Correspondingly, turning Q1 off removes the low-voltage signal and enables the output. Once enabled, the output will typically experience a 10–15ms delay followed by a predictable ramp-up of voltage. The regulator should provide a fully regulated output voltage within 30ms. The waveform of Figure 2 shows the output voltage response of a PT6342 (3.3V) following the turn-off of Q1. The turn off of Q1 corre- sponds to the rise in Vinh. The waveforms were measured with a 12Vdc input voltage, and 2 ½ Adc load. Figure 2 C in + C out + Inhibit +12V +3.3V COM COM Q1 BSS138 PT6342 2,3,4 5–8 1 2 9,10,11 Vin V o V o(adj) GND 1 Inhibit* PT6340 Series Vo (2V/Div) Iin (0.5A/Div) Vinh (10V/Div) HORIZ SCALE: 5ms/Div |
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