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| 型号： | LM2575IN |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封装： | ROHS COMPLIANT, PLASTIC, MS-001BB, DIP-16 |
| 文件页数： | 8/10页 |
| 文件大小： | 185K |
| 代理商： | LM2575IN |
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Output Voltage Ripple and Transients
Feedback Connection
ON/OFF Input
Grounding
1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR
SLVS569E – JANUARY 2005 – REVISED JANUARY 2006
APPLICATION INFORMATION (continued)
As with any switching power supply, the output of the LM2575 has 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
H and 100 F) at the output. This filter can reduce the output ripple
voltage by a factor of 10 (see Figure 1).
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
to minimize noise pickup.
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.
The power and ground connections of the LM2575 must be low impedance to help maintain output stability. With
the 16-pin package, 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.
7
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