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參數資料
| 型號： | PM6680A |
| 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, LEAD FREE, VFQFPN-32 |
| 文件頁數： | 13/48頁 |
| 文件大小： | 1932K |
| 代理商： | PM6680A |
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Device description
PM6680A
20/48
7.2
Constant on time architecture
Figure 29 shows the simplified block diagram of a constant on time controller. A minimum
off-time constrain (350 ns typ.) is introduced to allow inductor valley current sensing on
synchronous switch. A minimum on-time (130 ns) is also introduced to assure the start-up
switching sequence.
PM6680A 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
In steady state the FB pin voltage is about Vr and the regulated output voltage depends on
the external divider:
Equation 4
OUT
Vr
1
R
2
R
1
-------
+
×
=
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