Texas Instruments TLV62080EVM-756 Evaluation Module TLV62080EVM-756 TLV62080EVM-756 Datenbogen
Produktcode
TLV62080EVM-756
IN,MIN
OUT
OUT,MAX
DS(on)
L
V
V
I
(R
+ R )
=
+
´
Gate
Driver
Control
Logic
Low Side
N-MOS
High Side
N-MOS
Thermal
Shutdown
Softstart
Under
Voltage
Shutdown
direct control
&
compensation
VIN
SW
GND
PG
EN
VOS
REF
Active
Output
Discharge
Power
Good
FB
ramp
minimum
on-timer
DCS-CONTROL
TM
error
amplifier
amplifier
comparator
SLVSAK9E – OCTOBER 2011 – REVISED FEBRUARY 2014
8 Detailed Description
8.1 Overview
The TLV62080 and TLV62084 synchronous switched-mode converters are based on DCS-Control. DCS-Control
is an advanced regulation topology that combines the advantages of hysteresis and voltage mode control.
is an advanced regulation topology that combines the advantages of hysteresis and voltage mode control.
The DCS-Control topology operates in PWM (pulse width modulation) mode for medium to heavy load conditions
and in power save mode at light load currents. In PWM the TLV6208x converter operates with the nominal
switching frequency of 2 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 quiescent current to achieve high efficiency over the entire load current range. DCS-Control supports both
operation modes (PWM and PFM) using a single building block with a seamless transition from PWM to power
save mode without effects on the output voltage. The TLV62080 and TLV62084 devices offer both excellent DC
voltage and superior load transient regulation, combined with very low output voltage ripple, minimizing
interference with RF circuits.
and in power save mode at light load currents. In PWM the TLV6208x converter operates with the nominal
switching frequency of 2 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 quiescent current to achieve high efficiency over the entire load current range. DCS-Control supports both
operation modes (PWM and PFM) using a single building block with a seamless transition from PWM to power
save mode without effects on the output voltage. The TLV62080 and TLV62084 devices offer both excellent DC
voltage and superior load transient regulation, combined with very low output voltage ripple, minimizing
interference with RF circuits.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 100% Duty-Cycle Low-Dropout Operation
The devices offer low input-to-output voltage difference by entering the 100% duty-cycle mode. In this mode the
high-side MOSFET switch is constantly turned on and the low side MOSFET is switched off. This mode is
particularly useful in battery powered applications to achieve the longest operation time by taking full advantage
of the whole battery voltage range.
high-side MOSFET switch is constantly turned on and the low side MOSFET is switched off. This mode is
particularly useful in battery powered applications to achieve the longest operation time by taking full advantage
of the whole battery voltage range.
calculates the minimum input voltage to maintain switching
regulation based on the load current and output voltage.
With:
•
V
IN,MIN
= Minimum input voltage
•
I
OUT,MAX
= Maximum output current
•
R
DS(on)
= High-side FET on-resistance
•
R
L
= Inductor ohmic resistance
(1)
Copyright © 2011–2014, Texas Instruments Incorporated
9
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