- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358823 > LM2593HVT-ADJ (NATIONAL SEMICONDUCTOR CORP) SIMPLE SWITCHER Power Converter 150 kHz 2A Step-Down Voltage Regulator, with Features PDF資料下載
參數(shù)資料
| 型號： | LM2593HVT-ADJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SIMPLE SWITCHER Power Converter 150 kHz 2A Step-Down Voltage Regulator, with Features |
| 中文描述： | 4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, PZFM7 |
| 封裝： | TO-220, 7 PIN |
| 文件頁數(shù)： | 9/21頁 |
| 文件大?。?/td> | 753K |
| 代理商： | LM2593HVT-ADJ |
Block Diagram
10133330
PIN FUNCTIONS
+V
(Pin 1)—This is the positive input supply for the IC
switching regulator. A suitable input bypass capacitor must
be present at this pin to minimize voltage transients and to
supply the switching currents needed by the regulator.
Output
(Pin 2)—Internal switch. The voltage at this pin
switches between approximately (+V
IN
V
SAT
) and approxi-
mately 0.5V, with a duty cycle of V
OUT
/V
IN
.
Error Flag
(Pin 3)—Open collector output that goes active
low (
≤
1.0V) when the output of the switching regulator is out
of regulation (less than 95% of its nominal value). In this
state it can sink maximum 3mA. When not low, it can be
pulled high to signal that the output of the regulator is in
regulation (power good). During power-up, it can be pro-
grammed to go high after a certain delay as set by the Delay
pin (Pin 5). The maximum rating of this pin should not be
exceeded, so if the rail to which it will be pulled-up to is
higher than 45V, a resistive divider must be used instead of
a single pull-up resistor, as indicated in Figure 1
Ground
(Pin 4)—Circuit ground.
Delay
(Pin 5)—This sets a programmable power-up delay
from the moment that the output reaches regulation, to the
high signal output (power good) on Pin 3. A capacitor on this
pin starts charging up by means on an internal (
)
3 μA)
current source when the regulated output rises to within 5%
of its nominal value. Pin 3 goes high (with an external
pull-up) when the voltage on the capacitor on Pin 5 exceeds
1.3V. The voltage on this pin is clamped internally to about
1.7V. If the regulated output drops out of regulation (less
than 95% of its nominal value), the capacitor on Pin 5 is
rapidly discharged internally and Pin 3 will be forced low in
about 1/1000
th
of the set power-up delay time.
Feedback
(Pin 6)—Senses the regulated output voltage to
complete the feedback loop. This pin is directly connected to
the Output for the fixed voltage versions, but is set to 1.23V
by means of a resistive divider from the output for the
Adjustable version. If a feedforward capacitor is used (Ad-
justable version), then a negative voltage spike is generated
on this pin whenever the output is shorted. This happens
because the feedforward capacitor cannot discharge fast
enough, and since one end of it is dragged to Ground, the
other end goes momentarily negative. To prevent the energy
rating of this pin from being exceeded, a small-signal Schot-
tky diode to Ground is recommended for DC input voltages
above 40V whenever a feedforward capacitor is present
(See Figure 1). Feedforward capacitor values larger than 0.1
μF are not recommended for the same reason, whatever be
the DC input voltage.
Shutdown /Soft-start
(Pin 7)—The regulator is in shut-
down mode, drawing about 90 μA, when this pin is driven to
a low level (
≤
0.6V), and is in normal operation when this Pin
is left floating (internal pull-up) or driven to a high level (
≥
2.0V). The typical value of the threshold is 1.3V and the pin
is internally clamped to a maximum of about 7V. If it is driven
higher than the clamp voltage, it must be ensured by means
of an external resistor that the current into the pin does not
exceed 1mA. The duty cycle is minimum (0%) if this Pin is
below 1.8V, and increases as the voltage on the pin is
increased. The maximum duty cycle (100%) occurs when
this pin is at 2.8V or higher. So adding a capacitor to this pin
produces a softstart feature. An internal current source will
charge the capacitor from zero to its internally clamped
value. The charging current is about 5 μA when the pin is
below 1.3V but is reduced to only 1.6 μA above 1.3V, so as
to allow the use of smaller softstart capacitors.
L
www.national.com
9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2593HVS-3.3 | SIMPLE SWITCHER Power Converter 150 kHz 2A Step-Down Voltage Regulator, with Features |
| LM2593HVS-5.0 | SIMPLE SWITCHER Power Converter 150 kHz 2A Step-Down Voltage Regulator, with Features |
| LM2593HVS-ADJ | SIMPLE SWITCHER Power Converter 150 kHz 2A Step-Down Voltage Regulator, with Features |
| LM2593HVT-3.3 | SIMPLE SWITCHER Power Converter 150 kHz 2A Step-Down Voltage Regulator, with Features |
| LM2593HVT-5.0 | SIMPLE SWITCHER Power Converter 150 kHz 2A Step-Down Voltage Regulator, with Features |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2593HVT-ADJ | 制造商:Texas Instruments 功能描述:SWITCHING REG 2A ADJ 2593 TO2207 |
| LM2593HVT-ADJ/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 安裝風格:SMD/SMT |
| LM2594APDBCKGEVB | 功能描述:電源管理IC開發(fā)工具 LM2594ADJ PDIP8 BUCK DB RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM2594ASCBCKGEVB | 功能描述:BOARD EVAL FOR LM2594ADJ 8-SOIC RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:* 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標準包裝: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)壓器拓撲結(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM2594DADJG | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 0.5A BUCK SW REG 150KHZ RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。