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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 15/48頁(yè) |
| 文件大?。?/td> | 1932K |
| 代理商： | PM6680A |
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Device description
PM6680A
22/48
7.4
Pulse skip mode
If the SKIP pin is tied to ground, the device works in skip mode.
At light loads a zero-crossing comparator truncates the low-side switch on-time when the
inductor current becomes negative. In this condition the section works in discontinuous
conduction mode. The threshold between continuous and discontinuous conduction mode
is:
Equation 5
For higher loads the inductor current doesn’t cross the zero and the device works in the
same way as in PWM mode and the frequency is fixed to the nominal value.
Figure 31.
PWM and pulse skip mode inductor current
Figure 31 shows inductor current waveforms in PWM and SKIP mode. In order to keep
average inductor current equal to load current, in SKIP mode some switching cycles are
skipped. When the output ripple reaches the regulated voltage Vreg, a new cycle begins.
The off cycle duration and the switching frequency depend on the load condition.
As a result of the control technique, losses are reduced at light loads, improving the system
efficiency.
ILOAD SKIP
()
V
IN
V
OUT
–
2L
×
------------------------------
T
ON
×
=
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