- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358219 > MP8640DL (MONOLITHIC POWER SYSTEMS INC) SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, DSO14 PDF資料下載
參數(shù)資料
| 型號： | MP8640DL |
| 廠商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, DSO14 |
| 封裝： | 3 X 4 MM, MO-229VGED-3, QFN-14 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 351K |
| 代理商： | MP8640DL |
MP8640 – 3A, 23V, 600KHz STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP8640 Rev. 1.0
12/13/2007
www.MonolithicPower.com
6
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2007 MPS. All Rights Reserved.
Operation
IN
EN/SYNC
FB
SW
VCC
BG
GND
PG
BST
REGULATOR
OSCILLATOR
600KHz
DRIVER
CURRENT SENSE
AMPLIFIER
-
+
x40
ERROR
AMPLIFIER
CURRENT
LIMIT
COMPARATOR
PWM
COMPARATOR
DRIVER
D
REGULATOR
REFERENCE
--
+
--
+
--
+
S
R
R
Q
Q
C1
50pF
C1
1pF
POWER
GOOD
V
BG
V
CC
V
CC
V
BG
Figure 1—Functional Block Diagram
The MP8640 is a fixed frequency, synchronous,
step-down switching regulator with an integrated
high-side power MOSFET and a gate driver for a
low-side external MOSFET. It achieves 3A
continuous output current over a wide input
supply range with excellent load and line
regulation. It provides a single highly efficient
solution with current mode control for fast loop
response and easy compensation.
The MP8640 operates in a fixed frequency, peak
current control mode to regulate the output
voltage. A PWM cycle is initiated by the internal
clock. The integrated high-side power MOSFET
is turned on and remains on until its current
reaches the value set by the COMP voltage.
When the power switch is off, it remains off until
the next clock cycle starts. If, in 90% of one
PWM period, the current in the power MOSFET
does not reach the COMP set current value, the
power MOSFET will be forced to turn off.
Error Amplifier
The error amplifier compares the FB pin voltage
with the internal 0.8V reference (REF) and outputs
a current proportional to the difference between the
two. This output current is then used to charge or
discharge the internal compensation network to
form the COMP voltage, which is used to control
the power MOSFET current. The optimized
internal compensation network minimizes the
external component counts and simplifies the
control loop design.
Internal Regulator
Most of the internal circuitries are powered from
the 5V internal regulator. This regulator takes the
VIN input and operates in the full VIN range. When
VIN is greater than 5.0V, the output of the regulator
is in full regulation. When VIN is lower than 5.0V,
the output decreases. Since this internal regulator
provides the bias current for the bottom gate driver
that requires significant amount of current
depending upon the external MOSFET selection, a
1uF ceramic capacitor for decoupling purpose is
required.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MPA62-FREQ-OUT23 | CRYSTAL OSCILLATOR, CLOCK, 16 MHz - 150 MHz, CMOS/TTL OUTPUT |
| MPA64R-FREQ-OUT23 | CRYSTAL OSCILLATOR, CLOCK, 16 MHz - 105 MHz, CMOS/TTL OUTPUT |
| MPA63R-FREQ-OUT23 | CRYSTAL OSCILLATOR, CLOCK, 16 MHz - 105 MHz, CMOS/TTL OUTPUT |
| MPG4375S-J220KB | SINGLE COLOR LED, GREEN, 4 mm |
| MPN-2/BNC | PANEL MOUNT, FEMALE, BNC CONNECTOR, RECEPTACLE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MP8640DL-LF-P | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3A 23V 600kHz Step Dwn w/Sync Gate Drvr RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MP8640DL-LF-Z | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3A 23V 600kHz Step Dwn w/Sync Gate Drvr RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MP8642DU-LF-P | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Dual 3A, 23V 600kHz Step-Down RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MP8642DU-LF-Z | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Dual 3A, 23V 600kHz Step-Down RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MP8666DN-LF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 6A, 600kHz Step-Down w/Sync Gate Driver RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。