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| 型号： | PM6675S |
| 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： | 15/53页 |
| 文件大小： | 2632K |
| 代理商： | PM6675S |
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Device description
PM6675S
22/53
Figure 33.
Switching frequency selection and VOSC pin
The voltage seen at this pin must be greater than 0.8 V and lower than 2 V in order to
ensure the system linearity.
7.1.1
Constant-On-Time architecture
shows the simplified block diagram of the Constant-On-Time controller.
The switching regulator of the PM6675S controls a one-shot generator that turns on the
high-side MOSFET when the following conditions are simultaneously satisfied: the PWM
comparator is high (i.e. output voltage is lower than Vr = 0.6 V), the synchronous rectifier
current is below the current limit threshold and the minimum off-time has expired.
A minimum Off-Time contraint (300ns typ.) is introduced to assure the boot capacitor charge
and allow inductor valley current sensing on low-side MOSFET. A minimum On-Time is also
introduced to assure the start-up switching sequence.
Once the On-Time has timed out, the high side switch is turned off, while the synchronous
rectifier is ignited according to the anti-cross conduction management circuitry.
When the output voltage reaches the valley limit (determined by internal reference
Vr = 0.6 V), the low-side MOSFET is turned off according to the anti-cross conduction logic
once again, and a new cycle begins.
PM6675
VOSC
R1
R2
VIN
PM6675
VOSC
R1
R2
VIN
PM6675S
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相关代理商/技术参数 |
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| PM6680 | 功能描述:DC/DC 开关控制器 No Rsense dual StepDwn Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| PM6680_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:No Rsense dual step-down controller with adjustable voltages for notebook system power |
| PM6680A | 功能描述:DC/DC 开关控制器 Dual sync controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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