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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： | 14/42页 |
| 文件大小： | 0K |
| 代理商： | TPS51727RHARG4 |
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28
LL1
23
LL2
4
CSP1
5
CSN1
6
CSP2
7
CSN2
+
5 ms
Filter
5 ms
Filter
MUX
+
–
+
–
VDAC
+
–
+
R(t
ON)
PWM
UDG-08006
C(t
ON)
(
)
K
I1 I2
-
(
)
K
I2
I1
-
I AMP
TPS51727
PWM (High)
t - Time - ms
V
(C
(t
O
N
))
-
O
n
-T
im
e
C
o
n
tr
o
l
C
a
p
a
c
it
o
r
V
o
lt
a
g
e
-
V
DAC
PWM1 Output Pulse
PWM (Nom)
PWM (Low)
I1 < 12
I1 > 12
UDG-08007
www.ti.com ..................................................................................................................................................... SLUS806B – APRIL 2008 – REVISED JANUARY 2009
Figure 26. Current Sharing Block Diagram
Figure 26 also shows the TI D-Cap constant on-time modulator. The PWM comparator (not shown) starts a
pulse when the feedback voltage meets the reference. This pulse turns on the gate of the high-side MOSFET.
After the MOSFET turns on, the LL voltage for that phase is driven up to the battery input. This charges C(tON)
through R(tON). The pulse is terminated when the voltage at C(tON) matches the tON reference, normally the DAC
voltage (VDAC).
The block diagram in Figure 26 and Figure 27 show the circuit action at the level of an individual pulse (PWM1).
First assume that the 5-
s averaged value of I1 = I2. In this case, the PWM modulator terminates at V
DAC, and
the normal pulse width is delivered to the system.
Figure 27. Current Sharing Operation
Copyright 2008–2009, Texas Instruments Incorporated
21
Product Folder Link(s): TPS51727
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