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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： | 11/40页 |
| 文件大小： | 888K |
| 代理商： | LC5521D |
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19
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
Figure 17. Averaged input current waveform, LC552xD and LC552xF series
FB pin voltage
S/GND
EIN
Drain current
Averaged input current
D/ST
VCC
S/GND
D
V
P
C2
2(4)
8(1)
C4
1(2)
D
L2
LC55xxD
(LC552xF)
D5
R1
VCC
= 3.7mA
ICC(ON) (max)
Sto
p
St
ar
tu
p
ICC
9.4 V
VCC(OFF)
VCC(ON)
15.1 V
Figure 18. VCC pin peripheral circuit
Figure 19. VCC versus operation current, ICC
Startup Operation
Figure 18 shows the VCC pin peripheral circuit. The integrated
startup circuit is connected to the D/ST pin, and it generates a
constant current, ICC(STARTUP) = –3.0 mA, to charge capacitor C4
at the VCC pin. During this process, when VCC voltage reaches
VCC(ON) = 15.1 V, the IC starts operation, and when its voltage
exceeds VCC(BIAS)2 = 16.6 V, the startup circuit stops, in order to
eliminate its own power consumption.
The startup time is determined by the C4 capacitance and is
expressed by the formula below:
tSTART
C4
≈
|ICC(STARTUP)|
VCC(ON) – VCC(INIT)
(1)
where
tSTART is the startup time (s), and
VCC(INIT) is the VCC pin initial voltage (V).
A ceramic or film capacitor can be used for C4, and a value of
0.22 to 22 μF is generally recommended.
Figure 19 shows the relationship between VCC voltage and the
operating current, ICC. When VCC voltage reaches VCC(ON) =
15.1 V, the Controller circuit operation begins and the operating
current increases. After that, if VCC voltage decreases to VCC(OFF)
= 9.4 V, the Undervoltage Lockout (UVLO) circuit stops Control-
ler circuit operation, and the operation state returns to the startup
phase.
After the control circuit starts up, the auxiliary winding (D in
figure 18) voltage, rectified by diode D5, powers the VCC pin.
VCC voltage must satisfy these conditions:
VCC(BIAS)1(max) = 12.5 V < VCC < VCC(OVP)(min) = 28.5 V
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