參數(shù)資料
型號(hào)： PM6681ATR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.4 A DUAL SWITCHING CONTROLLER, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32
文件頁(yè)數(shù)： 13/47頁(yè)
文件大小： 2762K
代理商： PM6681ATR
Device description
PM6681A
20/47
7.2
Constant on time architecture
shows the simplified block diagram of a constant on time controller. A minimum
off-time constrain (350 ns typ.) is introduced to allow inductor valley current sensing on
synchronous switch. A minimum on-time (130 ns) is also introduced to assure the start-up
switching sequence.
PM6681A has a one-shot generator for each power section that turns on the high side
MOSFET when the following conditions are satisfied simultaneously: the PWM comparator
is high, the synchronous rectifier current is below the current limit threshold, and the
minimum off-time has timed out.
Once the on-time has timed out, the high side switch is turned off, while the synchronous
switch is turned on according to the anti-cross conduction circuitry management.
When the negative input voltage at the PWM comparator (Figure 31), which is a scaled-
down replica of the output voltage (see the external R1/R2 divider in Figure 32), reaches the
valley limit (determined by internal reference Vr = 0.9 V), the low-side MOSFET is turned off
according to the anti-cross conduction logic once again, and a new cycle begins.
Figure 31.
Constant on-time block diagram
7.3
Output ripple compensation and loop stability
In a classic constant on time control, the system regulates the valley value of the output
voltage and not the average value, as shown in Figure 30. In this condition, the output
voltage ripple is source of a DC static error.
To compensate this error, an integrator network can be introduced in the control loop, by
connecting the output voltage to the COMP1/COMP2 (for the OUT1 and OUT2 sections
respectively) pin through a capacitor CINT as in Figure 32.
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相關(guān)代理商/技術(shù)參數(shù)
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PM6685 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
PM6685_07 制造商:STMICROELECTRONICS 制造商全稱: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 開(kāi)關(guān)控制器 Monolithic VR RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
PM6686 制造商:STMicroelectronics 功能描述:
PM6686TR 功能描述:DC/DC 開(kāi)關(guān)控制器 Step-down Controller w/adj. voltages-dual RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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