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| 型号： | TPS51727RHARG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, QFN-40 |
| 文件页数： | 13/42页 |
| 文件大小： | 0K |
| 代理商： | TPS51727RHARG4 |
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t
ON
t
Summed Current Feedback
Time - ms
V
o
lt
a
g
e
-
V
CMP
V
DROOP
UDG-08005
PWM Frequency and Adaptive on Time Control
f
OUT
ON
IN
SEL
V
1
t
30 ns
V
=
+
÷
÷
è
è
(1)
CS
DROOP
M
R
A
I(L)
V
R
G
=
(2)
AutoBalance Current Sharing
SLUS806B – APRIL 2008 – REVISED JANUARY 2009 ..................................................................................................................................................... www.ti.com
Figure 25. D-CAP+ Mode Basic Waveforms
The summed current feedback is an amplified and filtered version of the CSPx and CSNx inputs. The TPS51727
provides dual independent channels of current feedback to increase the system accuracy and reduce the
dependence of circuit performance on layout compared to an externally summed architecture.
The on-time (at the LL node) is determined by Equation 1.
where
f
SEL is the frequency selected by the connection of the TONSEL pin
The on-time pulse is sent to the top MOSFET. The inductor current and summed current feedback rise to their
maximum value, and the multiplexer and de-multiplexer switch to the next phase. Each ON pulse is latched to
prevent double pulsing. The current sharing circuitry compares the average values of the individual phase
currents, then adds or subtracts a small amount from each on-time in order to bring the phase currents into line.
No user design is required.
Accurate droop is provided by the finite gain of the droop amplifier. The equation for droop is shown in
In Equation 2, RCS is the effective current sense resistance, when using a sense resistor or inductor DCR is
used. ACS is the gain of the current sense amplifier, ΣI(L) is the DC sum of inductor currents, RDROOP is the value
of resistor from the DROOP pin to VREF, and GM(droop) is the transconductance of the droop amplifier.
The capacitor in parallel with RDROOP matches the slew rate of the DROOP pin with the current feedback signals
to prevent ring-back during transient load conditions.
The basic mechanism for current sharing is to sense the average phase current, then adjust the pulse width of
each phase to equalize the current in each phase. The block diagram is shown in Figure 26.
20
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51727
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