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參數(shù)資料
| 型號： | PM6685TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 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)： | 18/52頁 |
| 文件大小： | 2536K |
| 代理商： | PM6685TR |
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PM6685
Device description
25/52
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
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
33kHz is enabled. At light load condition, If there is not a new switching cycle within a
30us(typ.) period, a no-audible skip mode cycle begins.
Figure 32. Frequency clamp 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 33kHz. As a consequence of the control, the regulated
voltage can be slightly higher than Vreg (up to 1%).
Time
Ton1 Toff
0
Inductor current
PWM mode
Pulse skip mode
Ton2
Low side off
Toff
Low side on
Load current
Ton1=Ton2
Time
0
Inductor current
No-audible skip mode
Low side
30us
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