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TPS62184 Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza TPS62184
Descripción Electrónicos  4-V to 17-V, 6-A, 2-Phase Step-Down Converter with AEE
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS62184 Datasheet(HTML) 9 Page - Texas Instruments

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IN
PEAK
OUT
IN
OUT
OUT
PSM
V
I
L
V
V
V
I
f
×
×
-
×
=
2
2
÷÷
ø
ö
çç
è
æ
-
=
-
=
IN
OUT
OFF
OFF
SW
V
V
t
t
D
f
1
1
1
OUT
IN
OUT
OFF
ON
V
V
V
t
t
-
×
=
TPS62184
www.ti.com
SLVSCQ5A – DECEMBER 2014 – REVISED FEBRUARY 2015
Device Functional Modes (continued)
While the OFF-time is predicted, the ON-time is set depending on the converter's duty cycle and calculated as:
spacing
(2)
spacing
Thereby the switching frequency is fixed for a given input and output voltage and is calculated as:
spacing
(3)
spacing
Both the master and follower phases regulate to the same level of VOUT with separate current loops, using the
same peak current setpoint, cycle by cycle. This provides excellent peak current balancing, independent of
inductor dc resistance matching. Since the follower phase operates with a fixed delay to the master phase, also
cycle by cycle, phase shifted operation is obtained.
The device features an automatic transition into Power Save Mode, entered at light loads, running in
discontinuous conduction mode (DCM).
8.4.2 Power Save Mode (PSM) Operation
As the load current decreases, the converter enters Power Save Mode operation. During PSM, the converter
operates with a reduced switching frequency maintaining highest efficiency due to minimum quiescent current.
Power Save Mode is based on a fixed peak current architecture, where the peak current (IPEAK) is set depending
on VIN, VOUT, and L. After each single pulse, a pause time until the internal VOUT_Low level threshold is reached
completes the switching cycle in PSM.
The switching frequency for PSM in one phase operation is calculated as :
spacing
(4)
spacing
Equation 4 shows the linear relationship of output current and switching frequency. Typical values of the fixed
peak current are shown in Figure 7.
space
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