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| 型号： | 5962-9687901QEA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.6 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, CDIP16 |
| 封装： | CERAMIC, DIP-16 |
| 文件页数： | 17/33页 |
| 文件大小： | 1016K |
| 代理商： | 5962-9687901QEA |
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Application Information (Continued)
Because of differences in the operation of the inverting regu-
lator, the standard design procedure is not used to select the
inductor value. In the majority of designs, a 68 H, 1.5A in-
ductor is the best choice. Capacitor selection can also be
narrowed down to just a few values. Using the values shown
in
Figure 25 will provide good results in the majority of invert-
ing designs.
This type of inverting regulator can require relatively large
amounts of input current when starting up, even with light
loads. Input currents as high as the LM2595 current limit (ap-
prox 1.5A) are needed for at least 2 ms or more, until the out-
put reaches its nominal output voltage. The actual time de-
pends on the output voltage and the size of the output
capacitor. Input power sources that are current limited or
sources that can not deliver these currents without getting
loaded down, may not work correctly. Because of the rela-
tively high startup currents required by the inverting topology,
the delayed startup feature (C1, R
1 and R2) shown in Figure
25 is recommended. By delaying the regulator startup, the
input capacitor is allowed to charge up to a higher voltage
before the switcher begins operating. A portion of the high in-
put current needed for startup is now supplied by the input
capacitor (C
IN). For severe start up conditions, the input ca-
pacitor can be made much larger than normal.
INVERTING REGULATOR SHUTDOWN METHODS
To use the ON /OFF pin in a standard buck configuration is
simple, pull it below 1.3V (@25C, referenced to ground) to
turn regulator ON, pull it above 1.3V to shut the regulator
OFF. With the inverting configuration, some level shifting is
required, because the ground pin of the regulator is no
longer at ground, but is now setting at the negative output
voltage level. Two different shutdown methods for inverting
regulators are shown in
Figure 27 and Figure 28.
DS012565-39
This circuit has hysteresis
Regulator starts switching at VIN = 13V
Regulator stops switching at VIN = 8V
FIGURE 24. Undervoltage Lockout with Hysteresis for Inverting Regulator
DS012565-40
CIN:
— 220 F/25V Tant. Sprague 595D
120 F/50V Elec. Panasonic HFQ
COUT:
— 22 F/20V Tant. Sprague 595D
120 F/25V Elec. Panasonic HFQ
FIGURE 25. Inverting 5V Regulator with Delayed Startup
DS012565-41
FIGURE 26. Inverting Regulator Typical Load Current
www.national.com
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PDF描述 |
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| 5962-9650301QEA | 2.6 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, CDIP16 |
| 5962-9650401QEA | 2.6 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, CDIP16 |
| LM2595J-3.3-QML | 2.6 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, CDIP16 |
| LM2595-5.0MDC | 2.6 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC |
| LM2595-5.0MWC | 2.6 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC |
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