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TPS40057 Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce TPS40057
Description  WIDE INPUT SYNCHRONOUS BUCK CONTROLLER
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

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TPS40054
TPS40055
TPS40057
SLUS593B − DECEMBER 2003 − REVISED APRIL 2004
9
www.ti.com
APPLICATION INFORMATION
PROGRAMMING THE RAMP GENERATOR CIRCUIT
The ramp generator circuit provides the actual ramp used by the PWM comparator. The ramp generator
provides voltage feed-forward control by varying the PWM ramp slope with line voltage, while maintaining a
constant ramp magnitude. Varying the PWM ramp directly with line voltage provides excellent response to line
variations since the PWM does not have to wait for loop delays before changing the duty cycle. (See Figure 1).
RAMP
COMP
SW
VIN
UDG−02131
VIN
SW
COMP
RAMP
VPEAK
VVALLEY
T2
tON1 > tON2 and d1 >
d2
tON2
tON1
d
+
t
ON
T
T1
Figure 1. Voltage Feed-Forward Effect on PWM Duty Cycle
The PWM ramp must be faster than the master clock frequency or the PWM is prevented from starting. The
PWM ramp time is programmed via a single resistor (RKFF) pulled up to VIN. RKFF is related to RT, and the
minimum input voltage, VIN(min) through the following:
R
KFF + VIN (min) * 3.5
58.14
R
T ) 1340 W
where:
D VIN(min) is the ensured minimum start-up voltage. The actual start-up voltage is nominally about 10% lower
at 25
°C.
D RT is the timing resistance in kΩ
The curve showing the RKFF required for a given switching frequency, fSW, is shown in Figure 3.
For low input voltage and high duty cycle applications, the voltage feed-forward may limit the duty cycle
prematurely. This does not occur for most applications. The voltage control loop controls the duty cycle and
regulates the output voltage. For more information on large duty cycle operation, refer to Application Note
(SLUA310).
(2)


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