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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： | 16/40页 |
| 文件大小： | 888K |
| 代理商： | LC5521D |
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23
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
and provides positive voltage, the quasi-resonant signal, to the
OCP pin. After the power MOSFET turns off, the quasi-resonant
signal immediately goes up and it exceeds the Quasi-Resonant
Operation Threshold Voltage-1, VBD(TH1) = 0.24 V. After this
occurs, the power MOSFET remains off until the quasi-resonant
signal comes down enough to cross the Quasi-Resonant Opera-
tion Threshold Voltage-2, VBD(TH2) = 0.17 V. Then the power
MOSFET again turns on. In addition, at that point, VBD(TH1)
becomes effective again and it prevents malfunction of the quasi-
resonant operation from noise interference.
During that period, C7 must cause a delay time, tONDLY, such
that the power MOSFET turns on at the bottom point of VDS ; so
select an appropriate C7 value. R3 is recommended to be between
100 and 330 Ω, and C5 to be between 100 and 470 pF.
R4 must set the range for the quasi-resonant signal: greater than
or equal to VBD(TH1) under input and output conditions where VCC
becomes lowest, but less than the OCP Pin Overvoltage Protec-
tion (OVP) Threshold Voltage, VOCP(OVP) = 2.6 V, under condi-
tions where VCC becomes highest. Figure 30 shows the valid
period of the quasi-resonant signal. For initiating quasi-resonant
operation, the quasi-resonant signal pulse width between the
two points VBD(TH1) and VBD(TH2) , tQR, must be equal to its valid
period of 1.2 μs or more. This period must be ensured, while
at the same time the OCP pin peak voltage, VOCPPK , is recom-
mended to be between 1.5 and 2.0 V. Both conditions should be
satisfied throughout the power supply input and output ranges,
over variations in R3 and R4 actual component values.
Figure 29. OCP pin peripheral circuit and auxiliary winding voltage
Valid period tQR ≥1.2 μs
S/GND
VOCPPK,1.5 to 2.0 V recommended
VBD(TH1)= 0.24 V
VBD(TH2)= 0.17 V
Figure 30. Valid period of the quasi-resonant signal
8(1)
3(5)
1(2)
Auxiliary Winding Voltage
S/GND
D/ST
P
D
T
Forward Voltage
Flyback Voltage
EIN
Ef
Clamping Snubber
C2
EIN
L2
D5
R4
R3
VQR
C7
C3
C4
ROCP
D6
D7
C5
LC55xxD
(LC55xxF)
Erev1
Efw1
0 V
tON
R1
OCP
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