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PT4310 Datasheet(PDF) 6 Page - Texas Instruments |
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PT4310 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 7 page For technical support and more information, see inside back cover or visit www.ti.com Application Notes continued PT4310 Series Using the Remote On/Off Function on the PT4310 Isolated Dual Output DC/DC Converters For applications requiring output voltage On/Off control, the PT4310 DC/DC converter series incorporates a “Remote On/Off” control (pin 11). This feature can be used when there is a requirement for the module to be switched off without removing the applied input source voltage. The converter operates normally with Pin 11 open-circuit, and produces a regulated output voltage when a valid source voltage is applied to +Vin (pin 18), with respect to –Vin (pin 17). When a low-level 1 ground signal is applied to pin 11, the converter output will be turned off. Figure 1 shows an application schematic, which details the typical use of the Remote On/Off function. Note the discrete transistor (Q1). The control pin has its own internal pull-up, and must be controlled with an open- collector or open-drain device (See notes 2 & 3). Table 1 gives the input requirements. When placed in the “Off” state, the standby current drawn from the input source is typically reduced to less than 1mA. Table 1; Remote On/Off Control Requirements 1 Parameter Min Typ Max Disable -0.1V — 1.0V Enable 5.0V 3 — Open-Circuit 2 Vo/c [Open-Circuit] — — 10V Iin [pin 11 at –Vin] — –200µA — Notes: 1. The Remote On/Off control uses –Vin (pin 17) as its ground reference. All voltages specified are with respect to –Vin. 2. Use an open-collector device (preferably a discrete transistor) for the Remote On/Off input. Do not connect a pull-up resistor directly to pin 11. 3. The Remote On/Off pin may be controlled with devices that have a totem-pole output providing that a blocking diode is used. The blocking diode is required to prevent current from being injected into On/Off control pin. Note: For TTL devices a pull-up may be required on the cathode side of the blocking diode. This is to guarantee a minimum enable voltage at pin 11 (See Figure 1). 4. The PT4310 converters incorporate an “Under- Voltage Lockout” (UVLO). The UVLO will keep the module off when the input voltage to the converter is low, regardless of the state of the Remote On/Off control. Table 2 gives the UVLO input voltage thresholds. Figure 1 Turn-On Time: In the circuit of Figure 1, turning Q1 on applies a low-voltage to pin 11 and disables the converter output. Correspondingly, turning Q1 off allows the converter to power up and produce a regulated output voltage within 50ms. Although the rise-time of the output is short (<1ms), the delay time will vary depending upon the input voltage and the module’s internal timing. Figure 2 shows response of the +5-V output from the PT4311 (±5.0V), following the turn-off of Q1 at time t =0. The waveform was measured with a 48Vdc input voltage, and 0.25-Adc resistive load at both the positive and negative outputs. Figure 2 R1 10k Q1 BSS138 +V o -V o +V n -V in Vdd 1 =OFF Note 1 U1a Note 1 Note 1 D1 1N4148 # # or similar low-leakage PIN diode PT4310 +V OUT –V OUT +Vin -Vin ±Vo Adjust 11 17 18 1 2 3 COM Remote On/Off 12 0 5 10 15 20 25 30 time (milli-secs) VO (2V/Div) delay time Table 2; UVLO Thresholds 4 Series Vin Range UVLO Threshold PT4310 38 – 75V 36V ±2V |
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