參數(shù)資料
型號(hào)： PM6652TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32
文件頁(yè)數(shù)： 20/53頁(yè)
文件大小： 2519K
代理商： PM6652TR
PM6652
Device description
Doc ID 16867 Rev 3
27/53
8.1.1
Constant on time PWM architecture
shows the simplified block diagram of a constant on time controller. A
minimum off-time constrain (250 ns typ.) is introduced to allow inductor valley current
sensing on synchronous switch. A minimum on-time (70 ns) is also introduced to assure the
start-up switching sequence.
PM6652 has a one-shot generator 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;
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 reaches the valley limit
(determined by the output voltage), the low-side mosfet is turned off according to the anti-
cross conduction logic once again, and a new cycle begins.
8.1.2
Output ripple compensation
In a classic constant on time control, the system regulates the valley value of the output
voltage and not the average value. In this condition, the half of the output voltage ripple is
the equivalent DC static error.
To compensate this error, an integrator network has been introduced in the control loop, by
connecting the CSNS pin to the COMP pin through a capacitor CINT as shown in Figure 25
. The ripple is generated by the output capacitor ESR and by the voltage drop on
the sense resistor RSENSE (inductor’s DCR or dedicated sense resistor). Assuming that
ROUT is the cumulative output capacitors’ ESR, COUT is the cumulative output capacitance
and GM is an internal parameter (Gm = 50 s typ.), the loop stability requires that CINT value
is:
Equation 5
The integrator amplifier generates a current, proportional to the DC input error, which sets
the output voltage in order to compensate the total static error. So doing the DC output
voltage value is independent of the output ripple, ensuring a very good line and load
regulation.
In addition, CINT provides an AC path for the RSENSE voltage ripple. In steady state
condition, the voltage at COMP pin is the sum of the output voltage and the output ripple.
OUT
M
INT
R
C
g
C
≥
相關(guān)PDF資料
PDF描述
PM6652 SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, QCC32
PM6675STR 3 A SWITCHING CONTROLLER, QCC24
PM6675S 3 A SWITCHING CONTROLLER, QCC24
PM6681ATR 0.4 A DUAL SWITCHING CONTROLLER, QCC32
PMA4118HSF/C 1-OUTPUT 18 W DC-DC REG PWR SUPPLY MODULE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6670 制造商:STMicroelectronics 功能描述:
PM6670AS 功能描述:DC/DC 開關(guān)控制器 DDR 2/3 Memory Pwr Cntrl RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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
PM6670ASTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
PM6670ATR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
PM6670S 功能描述:DC/DC 開關(guān)控制器 DDR 2/3 Memory Pwr Cntrl RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*