參數(shù)資料
型號： PM6680TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32
文件頁數(shù)： 16/49頁
文件大小： 2931K
代理商： PM6680TR
PM6680
Device description
23/49
7.2
Constant on time architecture
Figure 29 shows the simplified block diagram of a Constant On Time controller. A minimum
off-time constrain (300 ns typ.) is introduced to allow inductor valley current sensing on
synchronous switch. A minimum on-time (70 ns) is also introduced to assure the start-up
switching sequence.
PM6680 has a one-shot generator for each power section that turns on the high side
MOSFET when the following conditions are satisfied simultaneously: the PWM comparator
is high, the synchronous rectifier current is below the current limit threshold, and the
minimum off-time has timed out.
Once the on-time has timed out, the high side switch is turned off, while the synchronous
switch is turned on according to the anti-cross conduction circuitry management.
When the negative input voltage at the PWM comparator (Figure 29), which is a scaled-
down replica of the output voltage (see the external R1/R2 divider in Figure 29), reaches the
valley limit (determined by internal reference Vr = 0.9 V), the low-side MOSFET is turned off
according to the anti-cross conduction logic once again, and a new cycle begins.
Figure 29.
Constant on-time block diagram
+
-
HS
driver
Level
shifte
rr
LS
driver
Q
R
S
LDO5
Q
R
S
PWM
Comparato
rr
Positive
Current
Limit
Vr
+
-
Zero
Zero--cross.
cross.
Comp.
bandga
p
1.236V
SKIP
VREF
PHASE
PGND
LGATE
HGATE
BOOT
CSENSE
-
COMP
gm
OUT
Vr
+
-
Toff
Toff--min
min
Ton
+
-
VIN
0.5V
+
-
0.5V
+
-
0.25V
LDO5
FB
+
-
HS
driver
Level
shifte
rr
LS
driver
Q
R
S
LDO5
Q
R
S
PWM
Comparato
rr
Positive
Current
Limit
Vr
+
-
Zero
Zero--cross.
cross.
Comp.
bandga
p
1.236V
SKIP
VREF
PHASE
PGND
LGATE
HGATE
BOOT
CSENSE
-
COMP
gm
OUT
Vr
+
-
+
-
Toff
Toff--min
min
Ton
+
-
VIN
0.5V
+
-
0.5V
+
-
0.5V
+
-
0.25V
+
-
0.25V
LDO5
FB
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