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PTB78560A Datasheet(PDF) 7 Page - Texas Instruments |
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PTB78560A Datasheet(HTML) 7 Page - Texas Instruments |
7 / 29 page www.ti.com 1 2 3 4 11 9 7 5 10 8 6 PTB78560x (Top View) NEN Track PEN VO Seq +Sense −Sense VO Bus +VI VO Adjust VO COM −VI PTB78560A, PTB78560B PTB78560C SLTS249–JUNE 2005 TERMINAL FUNCTIONS TERMINAL DESCRIPTION NAME NO. The positive input for the module with respect to -VI. When powering the module from a negative input voltage, +VI(1) 1 this input is connected to the input source ground. The negative input supply for the module, and the 0-V reference for the PEN and NEN enable inputs. When -VI(1) 4 powering the module from a positive source, this input is connected to the input source return. An open-collector (open-drain) positive logic input that is referenced to -VI. When this input is pulled to -VI PEN (1) 2 potential the converter output is disabled. This input must be open circuit for the converter to operate. The converter then produces an output whenever a valid input source is applied. An open-collector (open-drain) negative logic input that is referenced to -VI. This input must be pulled to -VI potential to enable the converter. When the input is open circuit, the converter output is disabled. If the enable NEN (1)(2) 3 feature is not used, this input should be permanently connected to -VI. The module then produces an output whenever a valid input source is applied. This is the positive power output with respect to VO COM, and the main output from the converter. It is dc isolated from the input power pins and produces a valid output voltage approximately 20 ms before the voltage at the VO Bus 10 Track terminal is allowed to rise. This provides the required standby power source to any downstream nonisolated modules in power-up sequencing applications. This is a sequenced output voltage from the converter that is controlled by the Track terminal during power-up transitions. It is only available to the PTB78560B, and used with the output voltage set to 3.3 V (an I/O supply VO Seq 11 voltage). During power up, the voltage at VO Seq rises with the Track terminal, typically 20 ms after the VO Bus output has reached regulation. This is the output power return for both the VO Bus and VO Seq output voltages. This terminal should be VO COM 6 connected to the common of the load circuit. This terminal is used in power-up sequencing applications to control the output voltage of Auto-Track compatible modules, powered from the converter VOBus output. This includes the converter VOSeq output on the PTB78560B. The converter Track control has an internal transistor, which holds the voltage close to VOCOM Track 5 potential for approximately 20 ms (40 ms with the PTB78560C) after the VOBus output is in regulation. Following this delay, the Track voltage and VOSeq rises simultaneously with the output voltage of all other modules controlled by Auto-Track. Provides the converter with a remote sense capability when used with +Sense. For optimum output voltage –Sense 7 accuracy, this pin should always be connected to VOCOM, close to the load circuit. This terminal is also the reference connection for both the output voltage set-point resistor and Track control. A resistor must be connected between this terminal and -Sense to set the converter output voltage. A 0.05-W rated resistor may be used, with tolerance and temperature stability of 1% and 100 ppm/°C, respectively. If left VO Adjust 8 open circuit, the converter output voltage defaults to its lowest value. The specification table gives the standard resistor values for the most common output voltages. The +Sense pin can be connected to VOBus (or VOSeq) output. When connected to VOSeq, remote sense compensation is delayed until the converter's power-up sequence is complete. The voltage at VOBus is also +Sense 9 raised slightly. The +Sense input may be left open circuit, but connecting it to one of the output terminals improves load regulation of that output. (1) These functions indicate signals electrically common with the input. (2) Denotes negative logic: Low (–VI) = Normal operation, Open = Output off Terminal Locations 7 |
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