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| 型号： | TPS51727RHATG4 |
| 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： | TPS51727RHATG4 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页
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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