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PT6513 Datasheet(PDF) 8 Page - Texas Instruments |
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PT6513 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 11 page Application Notes For technical support and further information, visit http://power.ti.com PT6510 Series Using the Standby Function of the PT6510 Series of Integrated Switching Regulators The PT6510 series of power modules incorporate a Standby function. This may be used in applications that require power-up/shutdown sequencing, and wherever there is a requirement for the output status of the mod- ule to be controlled by external circuitry. The standby function is provided by the STBY* control, pin 3. If pin 3 is left open-circuit 1 the regulator operates normally, and provides a regulated output whenever a valid supply voltage is present at applied to Vin (pins 4-6) with respect to GND (pins 7–10). Applying a ground signal to pin 3 disables the regulator’s output and reduces the input current to about 1 mA 4. The standby control may also be used to hold off the regulator output during the period that input power is applied. Pin 3 is ideally controlled with an open-drain discrete transistor 1 (See Figure 3-1). It may also be driven directly from a dedicated TTL 3 compatible gate. Table 3-1 gives the circuit parameters for the control of this input. Table 3-1 Standby Control Requirements (2) Parameter Min Typ Max Input Low (VIL) –0.1 V 0.4 V Input High (VIH) 2 V Vin Input Low Current (IIL) –0.4 mA Notes: 1 The standby control input is ideally controlled using an open-drain discrete transistor. An external pull-up resistor is not necessary. The open-circuit voltage of the STBY* pin is the input voltage, Vin. 2. To ensure the regulator output is disabled, the control pin must be pulled to less than 0.4 Vdc with a low-level 0.5-mA sink to ground. 3. The STBY* input is also compatible with a differential output from standard TTL logic, providing the IC shares the same supply voltage as the module. 4. When the regulator output is disabled the current drawn from the input source is typically reduced to about 1 mA. Figure 3-1 Turn-On Time: In the circuit of Figure 3-1, turning Q1 on applies a low voltage to the STBY control (pin 3) 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 10–15 ms delay followed by a predictable ramp-up of voltage. The regulator should provide a fully regulated output voltage within 40 ms. The waveform of Figure 3-2 shows the output voltage and input current waveforms of a PT6511 (3.3 V) following the turn-off of Q1. The turn off of Q1 corresponds to the rise in Vstby. The waveforms were measured with a 5 Vdc input voltage, and 4.5 A resistive load. Figure 3-2 Vstby (2 V/Div) Vo (1 V/Div) HORIZ SCALE: 2 ms/Div Inhibit V in V o COM COM PT6511 11–13 14 7–10 4,5,6 Vin Vo GND Vo Adj STBY 3 Vo (Sns) 1 Q1 BSS138 V in C IN C OUT |
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