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TPS622315 Datasheet(PDF) 11 Page - Texas Instruments

No. de pieza TPS622315
Descripción Electrónicos  2-MHz and 3-MHz Ultra Small Step-Down Converter in 1 x 1.5 USON Package
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS622315 Datasheet(HTML) 11 Page - Texas Instruments

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I
= 0.5 x I
OUT_PFM/PWM
LPFMpeak
IN
OUT
LPFMpeak
ONmin
(V
V
)
I
=
t
L
-
´
OUT
ONmin
IN
V
t
=
260 ns
V
´
11
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234, TPS62235, TPS62236
TPS62237, TPS62238, TPS62239, TPS622310, TPS622311, TPS622312
TPS622313, TPS622314, TPS622315, TPS622316, TPS622317, TPS622318, TPS622319
www.ti.com
SLVS941G – APRIL 2009 – REVISED AUGUST 2016
Product Folder Links: TPS62230 TPS62231 TPS62232 TPS62233 TPS62234 TPS62235 TPS62236 TPS62237
TPS62238 TPS62239 TPS622310 TPS622311 TPS622312 TPS622313 TPS622314 TPS622315 TPS622316
TPS622317 TPS622318 TPS622319
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Copyright © 2009–2016, Texas Instruments Incorporated
8.4 Device Functional Modes
8.4.1 Soft-Start
The TPS6223x has an internal soft start circuit that controls the ramp up of the output voltage and limits the
inrush current during start-up. This limits input voltage drops when a battery or a high-impedance power source
is connected to the input of the converter.
The soft-start system generates a monotonic ramp up of the output voltage and reaches the nominal output
voltage typically 100 μs after EN pin was pulled high.
If the output voltage does not reached its target value by this time, such as in the case of heavy load, the
converter then operates in a current limit mode set by its switch current limits.
TPS6223x is able to start into a prebiased output capacitor. The converter starts with the applied bias voltage
and ramps the output voltage to its nominal value.
8.4.2 Power-Save Mode
Connecting the MODE pin to GND enables the automatic PWM and power-save mode operation. The converter
operates in quasi-fixed frequency PWM mode at moderate to heavy loads and in the pulse frequency modulation
(PFM) mode during light loads, which maintains high efficiency over a wide load current range. In PFM mode, the
device starts to skip switch pulses and generates only single pulses with an ON-time of tONmin. The PFM mode
frequency depends on the load current and the external inductor and output capacitor values. The PFM mode of
TPS6223x is optimized for low-output voltage ripple if small external components are used. Even at low output
currents, the PFM frequency is above the audible noise spectrum and makes this operation mode suitable for
audio applications.
The ON-time tONmin can be estimated to:
(1)
Therefore, the peak inductor current in PFM mode is approximately:
(2)
The transition from PFM into PWM mode and vice versa can be estimated to:
where
tON: High-side switch ON-time [ns]
VIN: Input voltage [V]
VOUT: Output voltage [V]
L: Inductance [μH]
ILPFMpeak: PFM inductor peak current [mA]
IOUT_PFM/PWM: Output current for PFM to PWM mode transition and vice versa [mA]
(3)
8.4.3 Forced PWM Mode
Pulling the MODE pin high forces the converter to operate in a continuous conduction PWM mode even at light
load currents. The advantage is that the converter operates with a quasi-fixed frequency that allows simple
filtering of the switching frequency for noise-sensitive applications. In this mode, the efficiency is lower compared
to the power save mode during light loads. This pin must be terminated except for the TPS622319 , which has
an integrated 1MΩ always active pull-down resistor.
For additional flexibility, it is possible to switch from power-save mode to forced PWM mode during operation.
This allows efficient power management by adjusting the operation of the converter to the specific system
requirements.


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