參數(shù)資料
型號(hào)： LC5521D
元件分類(lèi)： 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(yè)數(shù)： 25/40頁(yè)
文件大?。?/td> 888K
代理商： LC5521D
31
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
LC552xD/LC552xF series (isolated designs)
Figure 41 shows
the peripheral circuits at the FB pin of the LC552xD/LC552xF
devices and figure 42 shows the waveforms when the Overload
Protection (OLP) is activated. At an overload condition, the
output voltage drops and it results in a feedback signal from the
secondary output becoming zero. After that, the internal constant
current source at the FB pin starts to charge the C6 capacitor.
When the FB pin voltage reaches the Overload Protection
Threshold Voltage-2, VFB(OLP)2 = 4.5 V, the on-time is set to
Leading Edge Blanking time, tBW = 500 ns. In the meanwhile, the
capacitor charging is ongoing and when it reaches at Overload
Protection Threshold Voltage-1, VFB(OLP)1 = 5.5 V, the switching
operation stops. At the same time, the startup circuit is activated
and the operation begins intermittent operation by repeating
the restart and operation stop processes as long as the overload
condition remains.
Figure 41. FB pin peripheral circuit
Figure 42. Waveforms when OLP is being activated (LC552xD/ LC552xF)
S/GND
GND(ID)
VCC(ON) = 15.1 V
VCC(BIAS)1 = 11.0 V
VCC(OFF) = 9.4 V
VFB(OLP)1 = 5.5 V
VFB(OLP)2 = 4.5 V
VFB(MIN) = 0.9 V
VCC
OLP detect
VFB
ID
Restart
Time
7VReg
R
OCP
S/GND OCP
1(2)
4(6)
FB
C6
LC552xD
R7
(LC552xF)
3(5)
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