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TPS65251RHAR Datasheet(PDF) 20 Page - Texas Instruments

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No. de Pieza. TPS65251RHAR
Descripción  4.5-V TO 18-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN THREE BUCK SWITCHER WITH INTEGRATED FET
Descarga  31 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS65251RHAR Datasheet(HTML) 20 Page - Texas Instruments

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I
=
T
LIMIT
SLEEP_CLK
0.25 ·
·
V - V
IN
OUT
¾
L
DV
=
OUT
1
¾
C
·
(L I·LIMIT2
¾
2
·
V
IN
¾
V
V - V
OUT
IN
OUT
· (
)
-
I
LOAD
¾
f
SLEEP_CLK
)
V
= V
+
OUT_PK
OUT
DV
OUT
¾
2
V
OUT
V
OUT_PK
TPS65251
SLVSAA4B – JUNE 2010 – REVISED JANUARY 2011
www.ti.com
BUCK 2 AND 3 LOSSES (W)
BUCK 2 AND 3 LOSSES (W)
vs
vs
OUTPUT CURRENT
OUTPUT CURRENT
VIN = 12 V, fSW = 500 kHz
VIN = 12 V, fSW = 1.1 MHz
VO (From Top to Bottom) = 5 V , 3.3 V, 2.5 V, 1.8 V, 1.2 V
VO (From Top to Bottom) = 5 V , 3.3 V, 2.5 V, 1.8 V, 1.2 V
Figure 28.
Figure 29.
Low Power Mode Operation
By pulling the Low_p pin high all converters will operate in pulse-skipping mode, greatly reducing the overall
power consumption at light and no load conditions. Although each buck converter has a skip comparator that
makes sure regulation is not lost when a heavy load is applied and low power mode is enabled, system design
needs to make sure that the LP pin is pulled low for continuous loading in excess of 100 mA.
When low power is implemented, the peak inductor current used to charge the output capacitor is:
(7)
Where TSLEEP_CLK is half of the converter switching period, 2/fSW.
The size of the additional ripple added to the output is:
(8)
And the peak output voltage during low power operation is:
(9)
Figure 30. Peak Output Voltage During Low Power Operation
20
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