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TPS51275BRUKT Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS51275BRUKT
Description  Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS51275BRUKT Datasheet(HTML) 11 Page - Texas Instruments

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£
p ´
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SW
0
OUT
f
1
f
2
ESR
C
4
R1
R2
Voltage
Divider
+
VFB
+
VREF
PWM
Control
Logic
and
Divider
L
ESR
COUT
VC
RLOAD
IIND
IOUT
UDG-12111
IC
Switching Modulator
Output
Capacitor
VOUT
TPS51275
TPS51275B
TPS51275C
VIN
DRVH
DRVL
TPS51275, TPS51275B, TPS51275C
www.ti.com
SLUSB45B – JUNE 2012 – REVISED MARCH 2013
Light-Load Condition in Out-of-Audio™ Operation (TPS51275B)
Out-of-Audio™ (OOA) light-load mode is a unique control feature that keeps the switching frequency above
acoustic audible frequencies toward a virtual no-load condition. During Out-of-Audio™ operation, the OOA
control circuit monitors the states of both high-side and low-side MOSFETs and forces them switching if both
MOSFETs are off for more than 40 µs. When both high-side and low-side MOSFETs are off for 40 µs during a
light-load condition, the operation mode is changed to FCCM. This mode change initiates one cycle of the low-
side MOSFET and the high-side MOSFET turning on. Then, both MOSFETs stay turned off waiting for another
40 µs.
Table 1. SKIP Mode Operation (TPS51275/B/C)
SKIP MODE OPERATION
TPS51275
Auto-skip
TPS51275B
OOA
TPS51275C
Auto-skip
D-CAP™ Mode
From small-signal loop analysis, a buck converter using D-CAP™ mode can be simplified as shown in Figure 1.
Figure 1. Simplifying the Modulator
The output voltage is compared with internal reference voltage after divider resistors, R1 and R2. The PWM
comparator determines the timing to turn on the high-side MOSFET. The gain and speed of the comparator is
high enough to keep the voltage at the beginning of each ON cycle substantially constant. For the loop stability,
the 0dB frequency, ƒ0, defined in Equation 2 must be lower than 1/4 of the switching frequency.
(2)
As ƒ0 is determined solely by the output capacitor characteristics, the loop stability during D-CAP™ mode is
determined by the capacitor chemistry. For example, specialty polymer capacitors have output capacitance in the
order of several hundred micro-Farads and ESR in range of 10 milli-ohms. These yield an f0 value on the order
of 100 kHz or less and the loop is stable. However, ceramic capacitors have ƒ0 at more than 700 kHz, which is
not suitable for this operational mode.
Copyright © 2012–2013, Texas Instruments Incorporated
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