- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358827 > LM2696MXA (NATIONAL SEMICONDUCTOR CORP) 3A, Constant On Time Buck Regulator PDF資料下載
參數(shù)資料
| 型號(hào)： | LM2696MXA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3A, Constant On Time Buck Regulator |
| 中文描述： | 6.4 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁(yè)數(shù)： | 13/19頁(yè) |
| 文件大?。?/td> | 833K |
| 代理商： | LM2696MXA |
第1頁(yè)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)當(dāng)前第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)
Application Information
(Continued)
Legend:
t
1
: Min off-time (165 ns typical)
t
2
: On-time (set by the user)
t
3
: Min off-time (165 ns typical)
t
4
: Blanking time (165 ns typical)
t
5
: Extended off-time (12 μs typical)
V
L
: UVP threshold
The last benefit of this scheme is when the short circuit is
removed, and full load is re-applied, the part will automati-
cally recover into the load. The variation in the off-time
removes the constraints of other frequency fold back sys-
tems where the load would typically have to be reduced.
MODES OF OPERATION
Since the LM2696 utilizes a catch diode, whenever the load
current is reduced to a point where the inductor ripple is
greater than two times the load current, the part will enter
discontinuous operation. This is because the diode does not
permit the inductor current to reverse direction. The point at
which this occurs is the critical conduction boundary and can
be calculated by the following equation:
One advantage of the adaptive on-time control scheme is
that during discontinuous conduction mode the frequency
will gradually decrease as the load current decreases. In
DCM the switching frequency may be determined using the
relationship:
It can be seen that there will always be some minimum
switching frequency. The minimum switching frequency is
determined by the parameters above and the minimum load
presented by the feedback resistors. If there is some mini-
mum frequency of operation the feedback resistors may be
sized accordingly.
The adaptive on-time control scheme is effectively a pulse-
skipping mode, but since it is not tied directly to an internal
clock, its pulse will only occur when needed. This is in
contrast to schemes that synchronize to a reference clock
frequency. The constant on-time pulse-skipping/DCM mode
minimizes output voltage ripple and maximizes efficiency.
20153438
FIGURE 4. Fault Condition Timing
20153439
FIGURE 5. Normalized Output Voltage
Versus Load Current
L
www.national.com
13
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2696MXAX | 3A, Constant On Time Buck Regulator |
| LM2696 | 3A, Constant On Time Buck Regulator |
| LM26CIM5-PHA | Accurate, Factory Preset Thermostat |
| LM26CIM5-SHA | Accurate, Factory Preset Thermostat |
| LM26CIM5X-ZHA | Accurate, Factory Preset Thermostat |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2696MXA/NOPB | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3A,CONSTANT ON TIME BUCK REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2696MXAX | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4.5V to 24V 16-Pin TSSOP EP T/R |
| LM2696MXAX/NOPB | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM2698EVAL | 功能描述:電源管理IC開(kāi)發(fā)工具 EVAL BOARDFOR LM2698 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 |
| LM2698MM-ADJ | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。