TPS62000-HT
www.ti.com .......................................................................................................................................................... SLVS917A–MARCH 2009–REVISED JUNE 2009
Connecting the SYNC pin to the GND pin enables the power save mode. The converter operates in the PWM
mode at moderate to heavy loads and in the PFM mode during light loads maintaining high efficiency over a wide
load current range.
Connecting the SYNC pin to the VIN pin forces the converter to operate permanently in the PWM mode even at
light or no load currents. The advantage is the converter operates with a fixed switching 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 (see Figure 1).
It is possible to switch from forced PWM mode to the power save mode during operation.
The flexible configuration of the SYNC pin during operation of the device allows efficient power management by
adjusting the operation of the TPS62000 to the specific system requirements.
Low Noise Antiringing Switch
An antiringing switch is implemented in order to reduce the EMI radiated from the converter during discontinuous
conduction mode (DCM). In DCM, the inductor current ramps to zero before the end of each switching period.
The internal load comparator turns off the low side switch at that instant thus preventing the current flowing
backward through the inductance which increases the efficiency. An antiringing switch across the inductor
prevents parasitic oscillation caused by the residual energy stored in the inductance (see Figure 12).
NOTE:
The antiringing switch is only activated in the fixed output voltage versions. It is not
enabled for the adjustable output voltage version TPS62000.
Soft Start
As the enable pin (EN) goes high, the soft-start function generates an internal voltage ramp. This causes the
start-up current to slowly rise preventing output voltage overshoot and high inrush currents. The soft-start
duration is typical 1 ms (see Figure 13). When the soft-start function is completed, the error amplifier is
connected directly to the internal voltage reference.
Enable
Logic low on EN forces the TPS62000 into shutdown. In shutdown, the power switch, drivers, voltage reference,
oscillator, and all other functions are turned off. The supply current is reduced to less than 1 µA in the shutdown
mode.
Undervoltage Lockout
An undervoltage lockout circuit provides the save operation of the device. It prevents the converter from turning
on when the voltage on VIN is less than typically 1.6 V.
No Load Operation
In case the converter operates in the forced PWM mode and there is no load connected to the output, the
converter will regulate the output voltage by allowing the inductor current to reverse for a short period of time.
Copyright © 2009, Texas Instruments Incorporated
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