Texas Instruments TPS51116 Memory Power Solution, Synchronous Buck Controller Evaluation Module TPS51116EVM-001 TPS51116EVM-001 데이터 시트
제품 코드
TPS51116EVM-001
7
Performance Data and Characteristic Curves
0.001
0.01
0.1
1
10
55
50
65
60
75
70
85
80
90
100
95
I
DDQ
− Switching Output Current − A
Efficiency − %
V
IN
= 8 V
V
IN
= 12 V
V
IN
= 20 V
D-CAP Mode
V
V
OUT
= 1.8 V
S3 = Low
Performance Data and Characteristic Curves
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The TPS51116EVM is design to provide high efficiency over a very wide range of load currents from
maximum load of 10 A down to very light loads less than 100 mA. It is important to achieve high efficiency
at very light loads because memory modules consume very little current when waiting for instructions in an
idle state.
maximum load of 10 A down to very light loads less than 100 mA. It is important to achieve high efficiency
at very light loads because memory modules consume very little current when waiting for instructions in an
idle state.
Figure 4. TPS51116EVM Efficiency
The efficiency of the TPS51116EVM is shown in
. At less than 2-A of load current the TPS51116
is operating in PFM mode as the low-side MOSFET is turned off when inductor current reaches zero to
prevent sinking current from the output capacitor. Because the semi-hysteretic valley comparator threshold
does not change, output ripple voltage does not increase while in PFM mode. In addition to requiring very
good light load efficiency, memory module power supplies must have very good transient responses. As
the module goes from idle state to computational state, they may go from very light load to full load and
back again in a very short period of time. In order to achieve this fast transient response without requiring
large bulk output capacitance, the TPS51116EVM used the TI’s D-CAP control mode discussed in detail
in the Appendix. In D-CAP mode, the TPS51116EVM is able to immediately respond to a load transient,
going from nominal duty cycle to maximum duty cycle in a single switching cycle and return to nominal
duty cycle as soon as the output voltage has returned to its regulated value.
prevent sinking current from the output capacitor. Because the semi-hysteretic valley comparator threshold
does not change, output ripple voltage does not increase while in PFM mode. In addition to requiring very
good light load efficiency, memory module power supplies must have very good transient responses. As
the module goes from idle state to computational state, they may go from very light load to full load and
back again in a very short period of time. In order to achieve this fast transient response without requiring
large bulk output capacitance, the TPS51116EVM used the TI’s D-CAP control mode discussed in detail
in the Appendix. In D-CAP mode, the TPS51116EVM is able to immediately respond to a load transient,
going from nominal duty cycle to maximum duty cycle in a single switching cycle and return to nominal
duty cycle as soon as the output voltage has returned to its regulated value.
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Using the TPS51116EVM
SLUU202A – SEPTEMBER 2004 – Revised November 2008