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PTB48540AAH Datasheet(PDF) 2 Page - Texas Instruments |
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PTB48540AAH Datasheet(HTML) 2 Page - Texas Instruments |
2 / 12 page For technical support and further information visit http://power.ti.com Ordering Information Package Options (PTB48540x ❒❒) Code Description Pkg Ref. (1) AH Horiz. T/H (EUP) AS SMD, Standard (2) (EUQ) Output Voltage (PTB48540 ❒xx) Code Voltage A5 V B 3.3 V C 12 V Notes: (1) Reference the applicable package reference drawing for the dimensions and PC board layout (2) “Standard” option specifies 63/37, Sn/Pb pin solder material. Pin Descriptions –VOUT: This is the negative output from the module, with respect to +Vout. Both the +Vout and –Vout terminals are isolated from the Ethernet input, and used to power the PD appliance. When this pin is connected to the PD appli- ance common, a positive supply voltage is produced at +Vout. VOUT Adj: By connecting a single resistor to this pin, the regulated output voltage may be adjusted/trimmed by up to ±10 % from the original set-point value. If no adjust- ment is desired, this pin should be left open circuit. +VOUT: This is the positive output from the module with respect to –Vout, and is used to power the PD appliance. By connecting this pin to the PD appliance common, a negative supply voltage will be produced at –Vout. Input Ref: This pin provides access to the –Vin of the internal DC/DC converter, and is the 0-VDC reference for the ‘Output Inhibit’ control. Detect A: This is a control input that is normally left open circuit. The module incorporates an internal 24.9-k Ω resistor, between the ‘Detect A’ and ‘Detect B’ pins. This provides the PD with a correct “valid device” detection resistance for the PSE. By placing an external resistor between the ‘Detect A’ and ‘Detect B’ pins (in parallel with the internal 24.9-k Ω resistor) the module can be made to identify itself as a “non-valid device.” Detect B: This pin is used in conjunction with the ‘Detect A’ input only when it is desired for the PD to communicate a “non-valid” device signature to the PSE (see ‘Detect A’ description). ‘Detect B’ is also the rectified DC output from the module’s internal diode bridges, and represents the positive DC input to the module’s DC/DC converter. Connecting an external capacitor between this pin and the ‘Input Ref’ pin (0 V), adds more filter capacitance across the input of the DC/DC converter. Data Line A/B: These are the main inputs from which the module obtains DC input power from the Ethernet connector. The connection of these inputs to the Ethernet connections must be via an IEEE 802.3af compliant signal tranformer, that is designed for use in a PoE application. This is necessary to preserve the integrity of the Ethernet data traffic. Consult the example application for further information. Spare Line A/B: These are alternative inputs from which the module may obtain DC input power. In a PoE appli- cation, ‘Spare Line A’ may be directly connected to pins 4 & 5, and ‘Spare Line B’ to pins 7 & 8 of an Ethernet RJ-45 connector. These connections are not used for data trans- mission. Class A/B: The control inputs ‘Class A’ and ‘Class B’ allow the PD Class to be programmed from the module. The module incorporates an internal 4.42-k Ω resistor between the ‘Class A’ and ‘Class B’ inputs. This corresponds to a default “Class 0” PD classification signature being sent to the PSE. By adding an external resistor across these pins, the module can be programmed to other PD classifications. For further information, consult the PD class reference table in the application notes. Output Inhibit: This is an open-collector (or open-drain) negative logic input. Applying a low-level voltage to this input, with respect to the ‘Input Ref ’ pin, turns off the DC output voltage from the module. If the pin is left open-circuit, the module will operate as normal, pro- ducing an output voltage whenever it is connected to a valid PoE input source. PTB48540 Series 10-W Power-Over-Ethernet Isolated Power Module Assembly SLTS224B – APRIL 2004 – REVISED JULY 2004 Not Recommended for New Designs |
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