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參數(shù)資料
| 型號(hào)： | LC5521D |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.5 A POWER FACTOR CONTROLLER, 18 kHz SWITCHING FREQ-MAX, DIP7 |
| 封裝： | DIP-8/7 |
| 文件頁數(shù)： | 21/40頁 |
| 文件大?。?/td> | 888K |
| 代理商： | LC5521D |
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28
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
LC552xD/LC552xF series (isolated designs)
The LC552xD and
LC552xF series have three OVP activation methods link to the
VCC pin, to the OCP pin, and to the OVP pin:
VCC Pin Overvoltage Protection. figure 36 shows the wave-
forms of the OVP function. When the VCC pin voltage with ref-
erence to the S/GND pin reaches and exceeds VCC(OVP) = 31.5 V
or more, OVP is activated and the device enters intermittent oscil-
lation mode operation. VCC is sustained at VCC(BIAS)1 = 11.0 V by
the startup circuit. In the meantime, the FB pin voltage gradually
increases and when it reaches at VFB = 2.0 V, it stops the startup
circuit, and then VCC declines further. When it reaches VCC(OFF)
= 9.4 V, the startup sequence begins again, and if the overvolt-
age condition still exists, the same process described above is
repeated and overall operation enters the intermittent oscillation
mode. In addition, because VCC voltage is proportional to the
output voltage, it can be used to detect output overvoltage events,
such as open load condition. In this situation, the detecting volt-
age is expressed by equation 4.
Figure 36. Waveforms when VCC pin OVP is being activated (LC552xD and LC552xF)
ID
S/GND
GND(ID)
2.0 V
VFB
OVP detected
VCC(OVP) = 31.5 V
VCC(ON) = 15.1 V
VCC(BIAS)1 = 11.0 V
VCC(OFF) = 9.4 V
VCC
Startup
circuit on
Startup
circuit on
VFB ≥ 2.0 V, startup circuit off
Time
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