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參數(shù)資料
| 型號： | 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)： | 20/40頁 |
| 文件大?。?/td> | 888K |
| 代理商： | LC5521D |
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27
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
OCP Pin Overvoltage Protection. Figure 34 shows the OCP pin
OVP function. When the OCP pin voltage with reference to the S/
GND pin reaches VOCP(OVP) = 2.6 V or more, OVP is activated,
and the device enters intermittent oscillation mode operation as
described in the VCC pin OVP section, above. This can be used
as protection in the event that the quasi-resonant signal setup is
mistaken or excess load current happens in the use of a poor cou-
pling transformer between the primary and secondary winding.
ISENSE Pin Overvoltage Protection. Figure 35 shows the
ISENSE pin OVP operation. When the ISENSE pin voltage with
reference to the S/GND pin reaches and exceeds VISEN(OVP) =
2.0 V or more, OVP is activated, and the device enters the inter-
mittent oscillation mode operation as described in the VCC pin
OVP section, above. As shown in figure 9, with Zener diode ZD1
this function can be used to detect an excess output voltage, such
as caused by an open load condition, and protect the circuit.
Figure 35. Waveforms when ISENSE pin OVP is being activated (LC551xD)
OVP detected
ID
GND (ID)
VOCP
VCC
VOCP(OVP) = 2.6 V
S/GND
2.0 V
VCOMP
Startup
circuit on
Startup
circuit on
Time
VCC(ON) = 15.1 V
VCC(BIAS)1 = 11.0 V
VCC(OFF) = 9.4 V
VCOMP > 2.0 V, startup circuit off
VCC
S/GND
GND(IOUT)
VCC(BIAS)1 = 11.0 V
VCC(ON) = 15.1 V
VCC(OFF) = 9.4 V
S/GND
2.0 V
VCOMP
Startup
circuit on
Startup
circuit on
ID
GND (ID)
OVP detected
VISENSE
IOUT
VISEN(OVP) = 2.0 V
S/GND
Time
VCOMP > 2.0 V, startup circuit off
Figure 34. Waveforms when OCP pin OVP is being activated (LC551xD)
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