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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)： | 18/49頁 |
| 文件大?。?/td> | 2931K |
| 代理商： | PM6680TR |
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PM6680
Device description
25/49
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.
7.5
No-audible skip mode
If SKIP pin is tied to VREF, a no-audible skip mode with a minimum switching frequency of
33 kHz is enabled. At light load condition, If there is not a new switching cycle within a 30 us
(typ.) period, a no-audible skip mode cycle begins.
ON
OUT
IN
T
L
2
V
)
SKIP
(
ILOAD
×
=
0
Time
Ton1 Toff
Inductor current
PWM mode
Pulse skip mode
Ton2
Low side off
Toff
Low side on
Load current
Ton1=Ton2
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