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參數(shù)資料
| 型號： | LM2641-ADJMDC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 12/22頁 |
| 文件大?。?/td> | 531K |
| 代理商： | LM2641-ADJMDC |
Pin Description (Refer to Typical Application Circuits)
Pin #
Name
Function
1
CSH2
The sense point for the positive side of the voltage across the current sense resistor (R13)
placed in series with output #2.
2
FB2
The regulated output voltage appearing at output #2 is sensed using this pin by connecting it to
the center of the output resistive divider (R15 and R16).
3
COMP2
An R-C network made up of R11, C10, and C12 is connected to this pin which provides loop
compensation for regulated output #2.
4
SS2
This provides programmable soft-start for the #2 output along with capacitor C15.
5
ON/OFF2
This pin turns off only output #2.
6SD
The part can be put into “sleep” mode using this pin, where both outputs are off and the internal
chip functions are shut down.
7
SYNC
The internal oscillator may be synchronized to an external clock via this pin.
8
GND
Connect this pin to circuit Signal Ground.
9
REF
Internal 2.5V reference voltage. This voltage is turned off by the SD pin, but remains on if either
or both ON/OFF pins are pulled low, which turns off the regulated output(s).
10
2NDFB/FPWM
A 12V supply can be generated using an auxiliary winding on the 5V output inductor. Feedback
to control this 12V output is brought in through this pin. If the 12V supply is not required, this pin
can also force the chip to operate at fixed frequency at light loads by pulling the pin low (this is
the “forced-PWM” mode of operation). This will prevent the converter from operating in
pulse-skipping mode.
11
ON/OFF1
This pin turns off only output #1.
12
SS1
This provides programmable soft-start for the #1 output along with capacitor C3.
13
COMP1
An R-C network made up of R6, C5, and C7 is connected to this pin which provides loop
compensation for regulated output #1.
14
FB1
The regulated output voltage appearing at output #1 is sensed using this pin by connecting it to
the center of the output resistive divider (R1 and R2).
15
CSH1
The sense point for the positive side of the voltage across the current sense resistor (R4) placed
in series with output #1.
16
HDRV1
The drive for the gate of the high-side switching FET used for output #1.
17
SW1
This is the switching output drive point of the two power FETs which produce output #1.
18
CBOOT1
The bootstrap capacitor (C8) for output #1 is returned to this point.
19
LDRV1
The drive for the gate of the low-side switching FET (synchronous rectifier) used for output #1.
20
PGND
Connect this pin to circuit Power Ground.
21
CSL1
The sense point for the negative side of the voltage across the current sense resistor (R4)
placed in series with output #1.
22
LIN
This pin provides a low-current (50 mA max) 5V output. This output is always on, and can not be
turned off by either the SD or ON/OFF pins.
23
IN
This is the connection for the main input power.
24
LDRV2
The drive for the gate of the low-side switching FET (synchronous rectifier) used for output #2.
25
CBOOT2
The bootstrap capacitor (C9) for output #2 is returned to this point.
26
SW2
This is the switching output drive point of the two power FETs which produce output #2.
27
HDRV2
The drive for the gate of the high-side switching FET used for output #2.
28
CSL2
The sense point for the negative side of the voltage across the current sense resistor (R13)
placed in series with output #2.
LM2641
www.national.com
2
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| LM2641MTC-ADJ | 功能描述:DC/DC 開關(guān)控制器 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 |
| LM2641MTC-ADJ/NOPB | 功能描述:DC/DC 開關(guān)控制器 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 |
| LM2641MTCX-ADJ | 功能描述:DC/DC 開關(guān)控制器 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 |
| LM2641MTCX-ADJ/NOPB | 功能描述:DC/DC 開關(guān)控制器 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 |
| LM2642 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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