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TPS82085SILT Datasheet(PDF) 7 Page - Texas Instruments

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No. de pieza TPS82085SILT
Descripción Electrónicos  TPS82085 3-A High Efficiency Step-Down Converter MicroSiP with Integrated Inductor
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

TPS82085SILT Datasheet(HTML) 7 Page - Texas Instruments

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L
V
V
t
I
OUT
IN
ON
L
-
´
=
D
IN
OUT
ON
V
V
ns
420
t
´
=
VOUT
FB
GND
Output Discharge
Logic
260
Direct Control
and
Compensation
Timer
ton
Comparator
Ramp
Error Amplifier
DCS - Control
TM
MOSFET Driver
Control Logic
High Side
Current Sense
Hiccup
Counter
VIN
EN
Bandgap
Undervoltage Lockout
Thermal Shutdown
EN
PG
V
FB
V
REF
V
REF
400k
(1)
Note:
(1) When the device is enabled, the 400 k
resistor is disconnected.
(2) The integrated inductor in the module, L = 0.47µH.
L
(2)
TPS82085
www.ti.com
SLVSCN4B – OCTOBER 2014 – REVISED AUGUST 2015
7 Detailed Description
7.1 Overview
The TPS82085 synchronous step-down converter power module is based on DCS-Control™ (Direct Control with
Seamless transition into Power Save Mode). This is an advanced regulation topology that combines the
advantages of hysteretic, voltage and current mode control.
The DCS-Control™ topology operates in PWM (Pulse Width Modulation) mode for medium to heavy load
conditions and in PSM (Power Save Mode) at light load currents. In PWM, the converter operates with its
nominal switching frequency of 2.4 MHz having a controlled frequency variation over the input voltage range. As
the load current decreases, the converter enters Power Save Mode, reducing the switching frequency and
minimizing the IC's quiescent current to achieve high efficiency over the entire load current range. DCS-Control™
supports both operation modes using a single building block and therefore has a seamless transition from PWM
to PSM without effects on the output voltage. The TPS82085 offers excellent DC voltage regulation and load
transient regulation, combined with low output voltage ripple, minimizing interference with RF circuits.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 PWM and PSM Operation
The TPS82085 includes a fixed on-time (tON) circuitry. This tON, in steady-state operation in PWM and PSM
modes, is estimated as:
(1)
In PWM mode, the TPS82085 operates with pulse width modulation in continuous conduction mode (CCM) with
a tON shown in Equation 1 at medium and heavy load currents. A PWM switching frequency of typically 2.4 MHz
is achieved by this tON circuitry. The device operates in PWM mode as long as the output current is higher than
half the inductor's ripple current estimated by Equation 2.
(2)
To maintain high efficiency at light loads, the device enters Power Save Mode seamlessly when the load current
decreases. This happens when the load current becomes smaller than half the inductor's ripple current. In PSM,
the converter operates with a reduced switching frequency and with a minimum quiescent current to maintain
high efficiency. The on time in PSM is also based on the same tON circuitry. The switching frequency in PSM is
estimated as:
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