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TPS40180 Datasheet(PDF) 26 Page - Texas Instruments |
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TPS40180 Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 52 page  www.ti.com TPS40180 SLVS753B – FEBRUARY 2007 – REVISED NOVEMBER 2007 Table 2. RT Voltage and Clock Master/Slave RT VOLTAGE (VRT) (V) CLOCK MODE < 0.5 Master (or single converter) > 2 (tied to PVCC or VDD) Slave In the clock master mode, the master clock frequency is set by connecting a resistor from the RT pin to GND. In the clock master mode, the PSEL pin selects the CLKIO operating mode for the device. There are three possible states defined in Table 3. Table 3. PSEL Pin Modes for Clock Master PSEL RESISTANCE to GND MODE (k Ω) 0 No CLKIO. CLKIO does not send out pulses. OPEN 8 phase CLKIO. CLKIO send out a pulse train for interleaving with 45 ° phase separation 29.4 6 phase CLKIO. CLKIO send out a pulse train for interleaving with 60 ° phase separation In the clock slave mode, the CLKIO pin is an input. The controller fires in a fixed relationship to the master determined by the resistance placed from PSEL to GND, or is turned off to improve efficiency at light load. The actual result depends on how the master CLKIO is programmed. Table 4. PSEL Phase Programming for Slave With 8 Phase Master Clock PHASE ANGLE ( °) PSEL RESISTANCE to GND (k Ω) Standby OPEN 45 0 90 14.7 135 29.4 180 47 225 68 270 95.3 315 127 Table 5. PSEL Phase Programming for Slave With 6 Phase Master Clock PHASE ANGLE ( °) PSEL RESISTANCE to GND (k Ω) Standby OPEN 0 95.3 60 0 120 14.7 180 29.4 240 47 300 68 When a slave senses any level change on the PSEL pin that would indicate a change in firing angle, it momentarily goes into standby mode. When a slave leaves standby mode, it starts supplying current after 64 clock cycles have elapsed if the status of the PSEL pin has not changed from when the device entered standby mode. In this way, a slave can have its firing angle dynamically changed depending on operating conditions. A slave can be held in standby mode by allowing the PSEL pin to float. 26 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPS40180 |
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