參數(shù)資料
型號(hào)： 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(yè)數(shù)： 19/49頁(yè)
文件大?。?/td> 2931K
代理商： PM6680TR
Device description
PM6680
26/49
Figure 32.
No audible skip mode
The low side switch is turned on until the output voltage crosses about Vreg+1 %. Then the
high side MOSFET is turned on for a fixed on time period. Afterwards the low side switch is
enabled until the inductor current reaches the zero-crossing threshold. This keeps the
switching frequency higher than 33 kHz. As a consequence of the control, the regulated
voltage can be slightly higher than Vreg (up to 1 %).
If, due to the load, the frequency is higher than 33 kHz, the device works like in skip mode.
No-audible skip mode reduces audio frequency noise that may occur in pulse skip mode at
very light loads, keeping the efficiency higher than in PWM mode.
7.6
Current limit
The current-limit circuit employs a "valley" current-sensing algorithm. During the conduction
time of the low side MOSFET the current flowing through it is sensed. The current-sensing
element is the low side MOSFET on-resistance (Figure 33).
Figure 33.
RDSON sensing technique
0
Inductor current
Time
No audible skip mode
Low side
30us
LGATE
HGATE
CSENSE
PHASE
Rcsense
RDSon
HS
LS
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PDF描述
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