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L6610D Arkusz danych(PDF) 4 Page - STMicroelectronics |
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L6610D Arkusz danych(HTML) 4 Page - STMicroelectronics |
4 / 29 page L6610 4/29 4 Aout Output of the error amplifier for the main converter. This pin typically drives an optocoupler and is also used for compensation along with Ainv (pin #5). 5 Ainv Main loop error amplifier inverting input. The non-inverting input is connected to an internal 2.5V reference that can be digitally trimmed. A high impedance internal divider from +12V and +5V UV/OV sense pins (#23, #24) eliminates the need for external divider in most applications. The pin is used for error amplifier compensation. 6 12Visns Input pin for 12V current sense. Together with the 12V OV/UV sense pin (#24), this pin measures the voltage across a current sense resistor in series with the output. If the load current exceeds a preset threshold, MFAULT (#1) will go high. Depending on the mode set, MFAULT will be latched off or pulled low again after about 1 second to allow autorecovery. To disable this function the pin may be left open, shorted to ground or shorted to the 12V UV/OV pin. 7 5Visns/ 3V3isns Input pin for 5V or 3V3 current sense. Together with the OV/UV sense pin (#23 or #22), this pin measures the voltage across a current sense resistor in series with the output. If the load current exceeds a preset threshold, MFAULT (#1) will go high. Depending on the mode set, MFAULT will be latched off or pulled low again after about 1 second to allow autorecovery. To disable this function the pin may be left open, shorted to ground or shorted to the 5V UV/OV pin. 8 Cout Auxiliary loop optocoupler drive. Also node for error amp compensation. Large signal slew rate is limited to reduce sensitivity to switching noise. 9 Cinv Inverting input for Auxiliary error amplifier. The non-inverting input is connected to an internal 1.25V reference that can be digitally trimmed. 10 Dmon Dual or Auxiliary UV/OV monitor, Dmon is programmable to monitor 3V3 or 5V. To allow a correct power up, the UV function on this pin is blanked out during initial start-up. There is no delay for the OV function. 11 DFAULT Dual or Auxiliary fault protection. When Dmon (#10) recognizes an over voltage, DFAULT and MFAULT (#1) go high. DFAULT is capable of sourcing up to 50mA. Possible applications are a crowbar across the Auxiliary output or an opto-coupled fault signal to the primary side. 12 Vdd Positive input supply voltage. Vdd is normally supplied from the Auxiliary power supply output voltage. If Vdd-UVL detects a sustained under voltage, PW-OK (#14) will be pulled low and sending MFAULT (#1) high will disable the main converter. 13 ACsns Analog of bulk voltage for AC fail warning. The usual source of this analog pin is one of the secondary windings of the main transformer. Hysteresis is provided through a trimmable 50 µA current sink on this pin that is activated as the voltage at the pin falls below the internal reference (2.5V). 14 PW-OK /Data Power good signal for the Main converter. When asserted high, this pin indicates that the voltages monitored are above their UV limits. There will be typically 250ms delay from the Main outputs becoming good and PW-OK being asserted. This is nominally an open drain signal. To improve robustness, this output has a limited current sink capability. In programming mode, this pin is used for data input; then the absolute maximum rating will be Vdd+0.5V. 15 PS-ON / Clock Control pin to enable the Main converter. This pin has debouncing logic. A recognized high value on this pin will cause PW-OK (#14) to go immediately low and, after a delay of 2.5ms, to shut down the main PWM by allowing MFAULT (#1) to go high. During normal operation (or if not used) this pin has to be connected to a voltage lower than 0.8V. In programming mode, this pin will be used to clock serial data into the chip. 16 VREF 2.5V reference for external applications. This is a buffered pin. Shorting this pin to ground or to Vdd (#12) will not affect integrity of control or monitor references. An external capacitor (max. 100nF) is required whenever the pin is loaded (up to 5 mA), otherwise it can be left floating. PIN DESCRIPTION (continued) Pin # Name Description |
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