參數(shù)資料
型號： PM6685TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32
文件頁數(shù)： 17/52頁
文件大?。?/td> 2536K
代理商： PM6685TR
Device description
PM6685
24/52
Figure 30. Circuitry for output ripple compensation
The integrator amplifier generates a current, proportional to the DC errors, 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 COMP5/COMP3 pin is the sum of the reference voltage Vr and the output ripple
(see Figure 30). In fact when the voltage on the COMP pin reaches Vr, a fixed Ton begins
and the output increases.
For example, we consider VOUT=5V with an output ripple of V=50mV. Considering
CINT>>CFILT, the CINT DC voltage drop VCINT is about 5V-Vr+25mV=4.125V. CINT ensures
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+25mV=925mV.
For more details about the output ripple compensation network, see the paragraph “Closing
the integrator loop
” in the Design guidelines.
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:
Equation 4
+
-
Vr
-
COMP
gm
OUT
RFb1
RFb2
Vr
+
PWM
Comparator
CINT
RINT
CFILT
t
Vr
COUT
COMP PIN
VOLTAGE
L
D
OUTPUT VOLTAGE
I=gm(V1-Vr)
V1
t
V
VCINT
ROUT
+
-
Vr
--
COMP
gm
OUT
RFb1
RFb2
Vr
+
PWM
Comparator
CINT
RINT
CFILT
t
Vr
COUT
COMP PIN
VOLTAGE
L
D
OUTPUT VOLTAGE
I=gm(V1-Vr)
V1
t
V
VCINT
ROUT
ON
OUT
IN
T
L
2
V
)
SKIP
(
ILOAD
×
=
相關(guān)PDF資料
PDF描述
PM6686 SWITCHING CONTROLLER, QCC32
PM75B6L1C060 AC MOTOR CONTROLLER, DMA19
PMB2304T PLL FREQUENCY SYNTHESIZER, 220 MHz, PDSO14
PMB2306R PLL FREQUENCY SYNTHESIZER, 120 MHz, PDSO16
PMB2306T PLL FREQUENCY SYNTHESIZER, 120 MHz, PDSO14
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6686 制造商:STMicroelectronics 功能描述:
PM6686TR 功能描述:DC/DC 開關(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
PM6-6F-L 功能描述:端子 Metric Fork Terminal non-insulated, 4.0 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點電鍍:Tin over Nickel 觸點材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp
PM6-6R-D 制造商:Panduit Corp 功能描述:
PM6-6R-L 功能描述:端子 Metric Ring Terminal non-insulated, 2.5 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點電鍍:Tin over Nickel 觸點材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*