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参数资料
| 型号： | LM2575IKC |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| 封装： | TO-220, PLASTIC, 5 PIN |
| 文件页数： | 3/13页 |
| 文件大小： | 188K |
| 代理商： | LM2575IKC |
LM2575
1A SIMPLE STEPDOWN SWITCHING VOLTAGE REGULATOR
SLVS569A JANUARY 2005 REVISED FEBRUARY 2005
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
output voltage ripple and transients
As with any switching power supply, the output of the LM2575 will have a sawtooth ripple voltage at the switching
frequency. Typically about 1% of the output voltage, this ripple is due mainly to the inductor sawtooth ripple
current and the ESR of the output capacitor (see note on COUT). Furthermore, the output also may contain small
voltage spikes at the peaks of the sawtooth waveform; this is due to the fast switching of the output switch and
the parasitic inductance of COUT. These voltage spikes can be minimized through the use of low-inductance
capacitors.
There are several ways to reduce the output ripple voltage: a larger inductor, a larger COUT, or both. Another
method is to use a small LC filter (20
mH and 100 mF) at the output; this filter can reduce the output ripple voltage
by a factor of 10 (see typical application circuit, Figure 1).
feedback connection
For fixed voltage options, FEEDBACK must be wired to VOUT. For the adjustable version, FEEDBACK must be
connected between the two programming resistors. Again, both of these resistors should be in close proximity
to the regulator, and each should be less than 100 k
W to minimize noise pickup.
ON/OFF input
ON/OFF should be grounded or be a low-level TTL voltage (typically
<1.6 V) for normal operation. To shut down
the LM2575 and put it in standby mode, a high-level TTL or CMOS voltage should be supplied to this pin.
ON/OFF should not be left open and safely can be pulled up to VIN with or without a pullup resistor.
grounding
The power and ground connections of the LM2575 need to be low impedance to help maintain output stability.
For the 5-pin packages, both pin 3 and tab are ground, and either connection can be used as they are both part
of the same lead frame. With the 16-pin and 24-pin packages, all the ground pins (including signal and power
grounds) should be soldered directly to wide PCB copper traces to ensure low-inductance connections and
good thermal dissipation.
PRODUCT
PREVIEW
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2575IKTGR | 制造商:TI 制造商全称:Texas Instruments 功能描述:1-A SIMPLE STEP DOWN SWITCHING VOLTAGE REGULATOR |
| LM2575IKTT | 制造商:TI 制造商全称:Texas Instruments 功能描述:1-A SIMPLE STEP DOWN SWITCHING VOLTAGE REGULATOR |
| LM2575IKTTR | 制造商:TI 制造商全称:Texas Instruments 功能描述:1-A SIMPLE STEP DOWN SWITCHING VOLTAGE REGULATOR |
| LM2575IN | 功能描述:直流/直流开关调节器 1A Simple Step-Down Switching Volt Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2575INE4 | 功能描述:直流/直流开关调节器 1A Simple Step-Down Switching Volt Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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