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TPS57140QDRCRQ1 Datasheet(PDF) 17 Page - Texas Instruments

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No. de pieza TPS57140QDRCRQ1
Descripción Electrónicos  Step-Down DC-DC Converter
Download  53 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS57140QDRCRQ1 Datasheet(HTML) 17 Page - Texas Instruments

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0
500
1000
1500
2000
2500
0
25
50
75
100
125
150
175
200
RT/CLK-ClockResistance-kW
V =12V,
T =25°C
I
J
0
100
200
300
400
500
200
300
400
500
600
700
800
900 1000 1100
RT/CLK Resistance (kW)
1200
C006
SW
RT k
kHz 1.0888
206033
( W) =
¦
(
)
17
TPS57140-Q1
www.ti.com
SLVSAP3D – DECEMBER 2010 – REVISED FEBRUARY 2016
Product Folder Links: TPS57140-Q1
Submit Documentation Feedback
Copyright © 2010–2016, Texas Instruments Incorporated
Feature Description (continued)
7.3.10 Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
The switching frequency of the TPS57140-Q1 device is adjustable over a wide range from approximately 100-
kHz to 2500-kHz by placing a resistor on the RT/CLK pin. The RT/CLK pin voltage is typically 0.5 V and must
have a resistor to ground to set the switching frequency. To determine the timing resistance for a given switching
frequency, use Equation 7 or the curves in Figure 31 or Figure 32. To reduce the solution size, the designer
would typically set the switching frequency as high as possible, but consider tradeoffs of the supply efficiency,
maximum input voltage, and minimum controllable on-time.
The minimum controllable on time is typically 130 ns, which limits the maximum operating input voltage.
The frequency-shift circuit also limits the maximum switching frequency. Use Equation 7 or the curves in
Figure 31 or Figure 32 to calculate the timing resistor values for the required switching frequency.
(7)
Figure 31. High-Range RT
Figure 32. Low-Range RT
7.3.11 Overcurrent Protection and Frequency Shift
The TPS57140-Q1 device implements current-mode control, which uses the COMP pin voltage to turn off the
high-side MOSFET on a cycle-by-cycle basis. During each cycle, the device compares the switch current and
COMP pin voltage. When the peak switch current intersects the COMP voltage, the high side switch turns off.
During overcurrent conditions that pull the output voltage low, the error amplifier responds by driving the COMP
pin high, increasing the switch current. The internal clamping of the error amplifier output functions as a switch
current limit.
To increase the maximum operating switching frequency at high input voltages, the TPS57140-Q1 device
implements a frequency shift. The divisor of the switching frequency goes to 8, 4, 2, and 1 as the voltage ramps
from 0 to 0.8 V on the VSENSE pin.
The device implements a digital frequency shift to enable synchronizing to an external clock during normal start-
up and fault conditions. Because the device can only divide the switching frequency by 8, there is a maximum
input voltage limit in which the device operates and still has frequency-shift protection.
During short-circuit events (particularly with high-input-voltage applications), the control loop has a finite minimum
controllable on-time and the output has a very-low voltage. During the switch on-time, the inductor current ramps
to the peak current limit because of the high input voltage and minimum on-time. During the switch off time, the
inductor would normally not have enough off-time and output voltage for the inductor to ramp down by the ramp-
up amount. The frequency shift effectively increases the off-time, allowing the current to ramp down.


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