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TPS40180 Datasheet(PDF) 26 Page - Texas Instruments

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Part No. TPS40180
Description  SINGLE PHASE STACKABLE CONTROLLER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS40180 Datasheet(HTML) 26 Page - Texas Instruments

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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
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS40180


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