- 您现在的位置：买卖IC网 > PDF目录69061 > PM6681ATR (STMICROELECTRONICS) 0.4 A DUAL SWITCHING CONTROLLER, QCC32 PDF资料下载
参数资料
| 型号： | PM6681ATR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.4 A DUAL SWITCHING CONTROLLER, QCC32 |
| 封装： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件页数： | 14/47页 |
| 文件大小： | 2762K |
| 代理商： | PM6681ATR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页
PM6681A
Device description
21/47
Figure 32.
Circuitry for output ripple compensation
The integrator amplifier generates a current, proportional to the DC errors between the FB
voltage and Vr, which decreases the output voltage in order to compensate the total static
error, including the voltage drop on PCB traces. In addition, CINT provides an AC path for
the output ripple. In steady state, the voltage on COMP1/COMP2 pin is the sum of the
reference voltage Vr and the output ripple (see Figure 32). In fact when the voltage on the
COMP pin reaches Vr, a fixed Ton begins and the output increases.
For example, we consider Vout = 5 V with an output ripple of
V = 50 mV. Considering C
INT
>> CFILT, the CINT DC voltage drop VCINT is about 5 V - Vr + 25 mV = 4.125 V.
CINT assures an AC path for the output voltage ripple. Then the COMP pin ripple is a replica
of the output ripple, with a DC value of Vr + 25 mV = 925 mV.
For more details about the output ripple compensation network, see the paragraph “Closing
the integrator loop” in the design guidelines.
In steady state the FB pin voltage is about Vr and the regulated output voltage depends on
the external divider:
Equation 4
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:
+
×
=
1
2
R
1
Vr
OUT
相关PDF资料 |
PDF描述 |
|---|---|
| PMA4118HSF/C | 1-OUTPUT 18 W DC-DC REG PWR SUPPLY MODULE |
| PMA4118LSF/B | 1-OUTPUT 14.4 W DC-DC REG PWR SUPPLY MODULE |
| PMA4218GSF/B | 1-OUTPUT 21.6 W DC-DC REG PWR SUPPLY MODULE |
| PMA4118LSF/C | 1-OUTPUT 14.4 W DC-DC REG PWR SUPPLY MODULE |
| PMA4118HSF/B | 1-OUTPUT 18 W DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PM6685 | 功能描述:DC/DC 开关控制器 Dual Step Down 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 |
| PM6685_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Dual step-down main supply controller with auxilary voltages for notebook system power |
| PM6685TR | 功能描述:DC/DC 开关控制器 Monolithic VR 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 |
| PM6686 | 制造商:STMicroelectronics 功能描述: |
| PM6686TR | 功能描述:DC/DC 开关控制器 Step-down Controller w/adj. voltages-dual 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 |
发布紧急采购，3分钟左右您将得到回复。