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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： | 22/40页 |
| 文件大小： | 888K |
| 代理商： | LC5521D |
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29
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
Figure 38. Waveforms when OVP pin OVP is being activated
(LC552xD and LC552xF)
OVP detected
ID
GND(ID)
VOCP
VCC
VOCP(OVP) = 2.6 V
S/GND
VCC(BIAS)1 = 11.0 V
VCC(ON) = 15.1 V
VCC(OFF) = 9.4 V
S/GND
2.0 V
VFB
Startup
circuit on
Startup
circuit on
Time
VFB > 2.0 V, startup circuit off
OCP Pin Overvoltage Protection. Figure 37 shows the OCP pin
OVP function. When the OCP pin voltage with reference to the
S/GND pin reaches VOCP(OVP) = 2.6 V, 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 protec-
tion in the event the quasi-resonant signal setup is mistaken or
excess load current happens in the use of a poor coupling trans-
former between the primary and secondary winding.
OVP pin Overvoltage Protection. Figure 38 shows the OVP pin
OVP function. When the OVP pin voltage with reference to the
S/GND pin reaches and exceeds VOVP = 2.0 V, OVP is activated,
and the device enters intermittent oscillation mode operation as
described in the VCC pin OVP section, above. As shown in fig-
ure 10 and figure 11, with PC2 this function can be used to detect
high output voltage, such as an open load condition.
Figure 37. Waveforms when OCP pin OVP is being activated
(LC552xD and LC552xF)
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
VFB
Startup
circuit on
Startup
circuit on
ID
GND(ID)
OVP detected
VOVP
IOUT
VOVP = 2.0 V
S/GND
Time
VFB > 2.0 V, startup circuit off
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