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NX2309 Datasheet(PDF) 4 Page - Microsemi Corporation |
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NX2309 Datasheet(HTML) 4 Page - Microsemi Corporation |
4 / 16 page NX2309 4 Rev. 2.0 12/19/05 PIN DESCRIPTIONS PIN # PIN SYMBOL PIN DESCRIPTION Power supply voltage. A high freq 1uF ceramic capacitor is placed as close as possible to and connected to this pin and ground pin. The maximum rating of this pin is 16V. This pin supplies voltage to high side FET driver. A high freq 0.1uF ceramic capacitor is placed as close as possible to and connected to this pin and SW pin. Power ground. This pin is the error amplifiers inverting input. This pin is connected via resistor divider to the output of the switching regulator to set the output DC voltage. This pin is the output of the error amplifier and together with FB pin is used to compensate the voltage control feedback loop. This pin is also used as a shut down pin. When this pin is pulled below 0.2V, both drivers are turned off and internal soft start is reset. This pin is connected to source of high side FETs and provide return path for the high side driver. It is also used to hold the low side driver low until this pin is brought low by the action of high side turning off. LDRV can only go high if SW is below 1V threshold . High side gate driver output. Low side gate driver output. LDO controller feedback input. This pin is connected via resistor divider to the out- put of the switching regulator to set the output DC voltage.If the LDOFB pin is pulled below 0.4V, an internal comparator after a delay pulls down LDOOUT pin and ini- tiates the HICCUP circuitry. During the startup this latch is not activated, allowing the LDOFB pin to come up and follow the soft started Vref voltage. LDO controller output. This pin is controlling the gate of an external NCH MOSFET. The maximum rating of this pin is 16V. 5 1 3 8 9 10 2 4 6 7 VCC BST GND FB COMP SW HDRV LDRV LDO_FB LDO_OUT NOTE1: In actual circuit application, the ENSW pin is used to program converter start up and hysteresis threshold voltage. NOTE2: This parameter is guaranteed by design but not tested in production(GBNT). |
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