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MC34652R2 Fiches technique(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC34652R2 Fiches technique(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 25 page Analog Integrated Circuit Device Data 10 Freescale Semiconductor 34652 FUNCTIONAL DESCRIPTION FUNCTIONAL TERMINAL DESCRIPTION POWER GOOD OUTPUT (ACTIVE LOW) (PG) The PG terminal is the active low power good output signal that is used to enable or disable a load. This signal goes active after a successful power-up sequence and stays active as long as the device is in normal operation and is not experiencing any faults. The signal is deactivated under the following conditions: • Power is turned off. • The device is disabled for more than 1.0 ms. • The device exceeded its thermal shutdown threshold for more than 12 µs. • The device is in overvoltage or undervoltage mode for more than 1.0 ms. • Load current exceeded the overcurrent limit for more than 3.0 ms. This terminal is referenced to VIN. OUTPUT VOLTAGE (VOUT) The VOUT terminal is the drain of the internal Power MOSFET and supplies a current-limited voltage to the load. The load connects between the VOUT and VPWR terminals. START-UP AND RETRY DELAY TIMER (TIMER) This input is used to control the time-base used to generate the timing sequences at start-up and the retry delay when the device experiences any fault. The TIMER terminal can be left unconnected for a default timer value of 200 ms or the user can connect a resistor between this terminal and the VIN terminal to set the timer value externally. The timer value can vary between 100 ms and 1000 ms. OVERVOLTAGE CONTROL (OV) The OV terminal is used to set the upper limit of the input voltage operation range. If the OV terminal voltage goes above the overvoltage threshold value, the device turns off the internal Power MOSFET and deactivates the two power good outputs, PG and PG. The Power MOSFET stays off until the OV drops below the threshold value. The overvoltage detection circuit has a 1.0 ms filter timer. The OV terminal can be left unconnected for the typical default threshold value of 78 V or the user can set the threshold value externally with a simple voltage divider using resistors between the VPWR and VIN terminals. UNDERVOLTAGE CONTROL (UV) The UV terminal is used to set the lower limit of the input voltage operation range. If the UV terminal voltage goes below the undervoltage threshold value, the device turns off the internal Power MOSFET and deactivates the two power good outputs, PG and PG. The Power MOSFET stays off until the UV rises above the threshold value. The undervoltage detection circuit has a 1.0 ms filter timer. The UV terminal can be left unconnected for the typical default threshold value of 37 V or the user can set the threshold value externally with a simple voltage divider using resistors between the VPWR and VIN terminals. POSITIVE SUPPLY VOLTAGE INPUT (VPWR) The VPWR terminal is the most-positive power supply input. The load connects between the VPWR and VOUT terminals. DISABLE INPUT CONTROL (DISABLE) The DISABLE terminal is used to easily disconnect or connect the load from the main power line by disabling or enabling the 34652. It can also be used to reset the fault conditions that cause a “Power No Good” signal. If left open or connected to VPWR, the DISABLE terminal is inactive and the device is enabled. If a positive voltage (above VPWR) or a negative voltage (below VPWR) is applied to DISABLE, it is active and the device is disabled. The disable function has a 1.0 ms filter timer. This terminal is referenced to VPWR. CURRENT LIMIT CONTROL (ILIM) The ILIM terminal is used to set the overcurrent limit during normal operation. This terminal can be left unconnected for a default overcurrent limit value of 1.0 A or the user can connect an external resistor between the ILIM and VIN terminals to set the overcurrent limit value. This value can vary between 0.15 A and 2.25 A. The overcurrent detection circuit has a 100 µs filter timer. CHARGING CURRENT LIMIT CONTROL (ICHG) The ICHG terminal is used to set the current limit that is used to charge the load’s input capacitor, hence limiting the inrush current to a known constant value. This terminal can be left unconnected for a default charging current limit value of 0.1 A and a default ICHG rise time of 1.0 ms. Or the user can connect an external resistor between the ICHG and VIN terminals to set the current limit value between 0.05 A and 0.5 A and an external capacitor to increase the ICHG rise time. The recommended maximum rise time is 10 ms. |
Numéro de pièce similaire - MC34652R2 |
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Description similaire - MC34652R2 |
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