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| 型号： | PM6670STR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, QCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, VFQFPN-24 |
| 文件页数： | 22/54页 |
| 文件大小： | 742K |
| 代理商： | PM6670STR |
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PM6670S
Device description
Doc ID 14432 Rev 4
29/54
No-audible pulse-skip mode
Some audio-noise sensitive applications cannot accept the switching frequency to enter the
audible range as is possible in pulse-skip mode with very light loads. For this reason, the
PM6670S implements an additional feature to maintain a minimum switching frequency of
33 kHz despite a slight efficiency loss. At very light load conditions, if any switching cycle
has taken place within 30
μs (typ.) since the last one (because the output voltage is still
higher than the reference), a no-audible pulse-skip cycle begins. The low-side MOSFET is
turned on and the output is driven to fall until the reference has been crossed. Then, the
high-side switch is turned on for a TON period and, once it has expired, the synchronous
rectifier is enabled until the inductor current reaches the zero-crossing threshold (see
).
Figure 34.
Inductor current and output voltage at light load with non-audible pulse-skip
For frequencies higher than 33 kHz (due to heavier loads) the device works in the same way
as in pulse-skip mode. It is important to notice that in both pulse-skip and no-audible pulse-
skip modes the switching frequency changes not only with the load but also with the input
voltage.
VDDQ
Output
Inductor
current
Vreg
t
TMAX
TON TOFF
TIDLE
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| PM6675ASTR | 功能描述:低压差控制器 - LDO Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
| PM6675ATR | 功能描述:低压差控制器 - LDO High eff SD CNRL RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
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