- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98055 > PM6685TR (STMICROELECTRONICS) DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 PDF資料下載
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)： | 19/52頁 |
| 文件大?。?/td> | 2536K |
| 代理商： | PM6685TR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁
Device description
PM6685
26/52
If, due to the load, the frequency is higher than 33kHz, the device works like in skip mode.
No-audible skip mode reduces audio frequency noise that may occur in pulse skip mode at
very light loads, keeping the efficiency higher than in PWM mode.
7.6
Current limit
The current-limit circuit employs a “valley” current-sensing algorithm. During the conduction
time of the low side MOSFET the current flowing through it is sensed. The current-sensing
element is the low side MOSFET on-resistance(Figure 33)
Figure 33. RDSON sensing technique
An internal 100
A I
L current source (ICSENSE) is connected to CSENSE pin and determines
a voltage drop on RCSENSE. If the voltage across the sensing element is greater than this
voltage drop, the controller doesn’t initiate a new cycle. A new cycle starts only when the
sensed current goes below the current limit.
Since the current limit circuit is a valley current limit, the actual peak current limit is greater
than the current limit threshold by an amount equal to the inductor ripple current. Moreover
the maximum output current is equal to the valley current limit plus half of the inductor ripple
current:
Equation 5
The output current limit depends on the current ripple, as shown in Figure 34 on page 27:
LGATE
HGATE
CSENSE
PHASE
Rcsense
RDSon
HS
LS
2
I
(max)
I
L
Lvalley
LOAD
+
=
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。