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参数资料
| 型号： | LC5521D |
| 元件分类： | 稳压器 |
| 英文描述： | 2.5 A POWER FACTOR CONTROLLER, 18 kHz SWITCHING FREQ-MAX, DIP7 |
| 封装： | DIP-8/7 |
| 文件页数： | 19/40页 |
| 文件大小： | 888K |
| 代理商： | LC5521D |
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Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
stopping voltage, VCC(OFF) = 9.4 V. Thus device operation in latch
mode is maintained. To release the device from latch mode, cut
off the AC mains and let VCC voltage drop below VCC(OFF).
Overvoltage Protection (OVP)
LC551xD series (non-isolated designs)
The LC551xD series
has three OVP activation methods link to the VCC pin, to the
OCP pin, and to the ISENSE pin:
VCC Pin Overvoltage Protection. figure 33 shows the wave-
forms of the OVP function on the VCC pin. When the VCC pin
voltage with reference to the S/GND pin reaches and exceeds
VCC(OVP) = 31.5 V, OVP is activated and the device enters
intermittent oscillation mode operation. The startup circuit tries
to sustain VCC pin voltage at VCC(BIAS)1 = 11.0 V, but in the
meanwhile, the COMP pin voltage gradually increases and when
it reaches 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 overvoltage 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 an output overvoltage event, such
as open load condition. In this situation, the detecting voltage is
expressed by the formula below:
=
VOUT(OVP)
31.5 (V)
VCC(normal operation)
VOUT(normal operation)
(4)
Figure 33. Waveforms when VCC pin OVP is being activated (LC551xD)
ID
S/GND
GND(ID)
2.0 V
VCOMP
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
VCOMP ≥ 2.0 V, startup circuit off
Time
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