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TPS51312 Datasheet(PDF) 9 Page - Texas Instruments

No. de pieza TPS51312
Descripción Electrónicos  3.1-V to 5.5-V Input, 3-A Output, Synchronous, Step-Down Regulator with Integrated FETs
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS51312 Datasheet(HTML) 9 Page - Texas Instruments

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ILOAD
VC – VCS
PWM
VFB –VREF
UDG-12115
IL
VFB–VREF
VC – VCS
PWM
IL
VOUT
tON
PWM delay ~100 ns
UDG-12114
TPS51312
www.ti.com
SLUSB57 – SEPTEMBER 2012
Fast Feedforward Loop (C)
Loop C is the additional loop that acts a direct fast feedforward loop to enhance the transient response.
In steady state operation as shown in Figure 10, the on time is initiated by the interaction of the three loops
mentioned above. When the (VC– VCS) is rising above threshold defined by (VFB – VREF), the PWM comparator
issues the on time pulse after the propagation delay. The demand of on time occurs when the artificial current
has reached the valley point. The load regulation is maintained by the integrator provided by the gM amplifier and
integrator.
In transient operation as shown in Figure 11, the benefit of this topology is becoming evident. In an all MLCC
output configuration, especially when the output capacitance is low, when the load step is applied, the output
voltage is immediately discharged to try to keep the load demand. The immediate reflection of the load demand
is instantly reflected in the FB voltage. The (VFB – VREF) is thus served as a termination voltage level for the
(VC – VCS), thus modulating the initiation of the on time. The transient response can be improved further by
amplifying the difference between VFB and the VREF reference.
Figure 10. Steady-State Operation
Figure 11. Transient Operation
PWM Frequency
The TPS51312 operates at a switching frequency of 900 kHz.
Light Load Power Saving Features
The TPS51312 offers an automatic pulse-skipping feature to provide excellent efficiency over the entire load
range. The converter senses the current during low side FET on and prevents negative current flow by turning off
the low side FET. This saves power by eliminating re-circulation of the inductor current. When the bottom FET is
turned off, the converter enters discontinuous mode, and the switching frequency decreases, reducing switching
loss.
Power Sequences
TPS51312 initiates the soft-start process when the EN, VIN and VCC pins are ready. The soft-start time 300 µs
when the reference voltage is between 0 V and 0.6 V (VREF). The actual voltage ramp up time is the same as
that of the VREF start-up time, which is 300 µs.
Power Good Signal
The TPS51312 has one open-drain power good (PGOOD) pin. During initial startup, there is a 1.3-ms power
good high propagation delay after EN goes high. The PGOOD de-asserts when the EN is pulled low or an
undervoltage condition on VCC or VIN or any other faults (such as VOUT, UVP, OCP, OVP) that require latch off
action is detected.
Protection Features
The TPS51312 offers many features to protect the converter power chain as well as the system electronics.
Copyright © 2012, Texas Instruments Incorporated
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