- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄369786 > LM2640 PDF資料下載
參數(shù)資料
| 型號(hào)： | LM2640 |
| 文件頁(yè)數(shù)： | 2/18頁(yè) |
| 文件大?。?/td> | 504K |
| 代理商： | LM2640 |
第1頁(yè)當(dāng)前第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)
Pin Description
(Refer to Typical Application Circuits)
Pin
#
1
Name
Function
CSH2
The sense point for the positive side of the voltage across the current sense resistor (R13)
placed in series with output
#
2.
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).
An R-C network made up of R11, C10, and C12 is connected to this pin which provides loop
compensation for regulated output
#
2.
This provides programmable soft-start for the
#
2 output along with capacitor C15.
This pin turns off only output
#
2.
The part can be put into “sleep” mode using this pin, where both outputs are off and the internal
chip functions are shut down.
The internal oscillator may be synchronized to an external clock via this pin.
Connect this pin to circuit Signal Ground.
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).
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.
This pin turns off only output
#
1.
This provides programmable soft-start for the
#
1 output along with capacitor C3.
An R-C network made up of R6, C5, and C7 is connected to this pin which provides loop
compensation for regulated output
#
1.
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).
The sense point for the positive side of the voltage across the current sense resistor (R4) placed
in series with output
#
1.
The drive for the gate of the high-side switching FET used for output
#
1.
This is the switching output drive point of the two power FETs which produce output
#
1.
The bootstrap capacitor (C8) for output
#
1 is returned to this point.
The drive for the gate of the low-side switching FET (synchronous rectifier) used for output
#
1.
Connect this pin to circuit Power Ground.
The sense point for the negative side of the voltage across the current sense resistor (R4)
placed in series with output
#
1.
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.
This is the connection for the main input power.
The drive for the gate of the low-side switching FET (synchronous rectifier) used for output
#
2.
The bootstrap capacitor (C9) for output
#
2 is returned to this point.
This is the switching output drive point of the two power FETs which produce output
#
2.
The drive for the gate of the high-side switching FET used for output
#
2.
The sense point for the negative side of the voltage across the current sense resistor (R13)
placed in series with output
#
2.
2
FB2
3
COMP2
4
5
6
SS2
ON/OFF2
SD
7
8
9
SYNC
GND
REF
10
2NDFB/FPWM
11
12
13
ON/OFF1
SS1
COMP1
14
FB1
15
CSH1
16
17
18
19
20
21
HDRV1
SW1
CBOOT1
LDRV1
PGND
CSL1
22
LIN
23
24
25
26
27
28
IN
LDRV2
CBOOT2
SW2
HDRV2
CSL2
L
www.national.com
2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2640MTC-ADJ | Current-Mode SMPS Controller |
| LM2641 | |
| LM2641MTC-ADJ | Current-Mode SMPS Controller |
| LM2642 | |
| LM2645 | |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM26400Y | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual 2A, 500kHz Wide Input Range Buck Regulator |
| LM26400Y_0708 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual 2A, 500kHz Wide Input Range Buck Regulator |
| LM26400YEVAL | 功能描述:BOARD EVALUATION LM26400Y RoHS:否 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM26400YEVAL/NOPB | 功能描述:電源管理IC開(kāi)發(fā)工具 LM26400Y EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM26400YMH | 制造商:Texas Instruments 功能描述:Conv DC-DC Dual Step Down 3V to 20V 16-Pin TSSOP EP Rail 制造商:Texas Instruments 功能描述:REG, BUCK, DUAL, 2A, ETSSOP16-16 制造商:Texas Instruments 功能描述:Buck Regulator,Dual ,2A, 500kHz ,TSSOP16 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。