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PT6653D Datasheet(PDF) 5 Page - Texas Instruments |
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PT6653D Datasheet(HTML) 5 Page - Texas Instruments |
5 / 16 page Application Notes For technical support and further information, visit http://power.ti.com Using the Standby Function on the PT6650 Series of 12/24-V Input Bus Converters For applications requiring output voltage On/Off control, the 14-pin PT6650 ISR series incorporates a standby function. This feature may be used for power-up/shut- down sequencing, and wherever there is a requirement for the output status of the module to be controlled by external circuitry. The standby function is provided by the STBY* control, pin 3. If pin 3 is left open-circuit the regulator operates normally, providing a regulated output whenever a valid supply voltage is applied to Vin (pins 4, 5, & 6) with respect to GND (pins 7-10). Connecting pin 3 to ground 1 will disable the regulator output and reduce the input current to less than 30 mA 3. Grounding the standby control will also hold-off the regulator output during the period that input power is applied. The standby input is ideally controlled with an open-drain discrete transistor (See Figure 2-1). It can also be driven directly from a dedicated TTL 2 compatible gate. Table 2-1 provides details of the threshold requirements. Table 2-1 Inhibit Control Thresholds (1, 2) Parameter Min Max Enable (VIH) 1 V 5 V Disable (VIL) –0.1 V 0.3 V Notes: 1. The Standby input on the PT6650 regulator series may be controlled using either an open-collector (or open-drain) discrete transistor, or a device with a totem-pole output. A pull-up resistor is not necessary. The control input has an open-circuit voltage of about 1.5 Vdc. To disable the regulator output, the control pin must be “pulled” to less than 0.3 Vdc with a low-level 0.25 mA maximum sink to ground. 2. The Standby input on the PT6650 series is also compatible with TTL logic. A standard TTL logic gate will meet the 0.3 V VIL(max) requirement (Table 2-1 ) at 0.25 mA sink current. Do not drive the Standby control input above 5 Vdc. 3. When the regulator output is disabled the current drawn from the input source is reduced to approximately 15 mA (30 mA maximum). 4. The turn-off time of Q1, or rise time of the standby input is not critical on the PT6650 series. Turning Q1 off over periods up to 100 ms will not damage the regulator. However, a slow turn-off time will increase both the initial delay and rate-of-rise of the output voltage. Figure 2-1 Turn-On Time: Turning Q1 off in Figure 2-1, removes the low-voltage signal at pin 3 and enables the output. The PT6650 series of regulators will provide a fully regulated out- put voltage within 12 ms. The actual turn-on time may vary with load and the total amount of output capacitance. Figure 2-2 shows the typical output voltage waveform of a PT6653 (5 V) following the prompt turn-off of Q1 at time t =0 secs. The waveform was measured with a 24 V input voltage, and 5 A resistive load. Figure 2-2 C in + C out + Inhibit V in V o COM COM Q1 BSS138 +5V V in PT6650 11,12,13 14 7,8,9,10 4,5,6 Vin Vo GND Vo(adj) STBY 3 Vsense 1 PT6650 Series 0 2468 10 12 t (milli - secs) Vo (2V/Div) |
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