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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： | 24/40页 |
| 文件大小： | 888K |
| 代理商： | LC5521D |
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30
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
Overload Protection (OLP)
If the MOSFET drain current is limited by the overcurrent
protection for a certain delay period, tDLY, Overload Protection
is activated and the device enters intermittent oscillation mode
operation. This reduces the power-up stress on the incorporated
power MOSFET and secondary diode.
LC551xD series (non-isolated designs)
Figure 39 shows the
peripheral circuit at the COMP pin, and figure 40 shows opera-
tion when OLP is activated.
At an overload condition, the ISENSE pin voltage drops because
the output voltage drops. When it reaches VSEN(TH) = 0.30 V, the
output of the OTA circuit becomes zero, and therefore the internal
constant current source at the COMP pin starts charging capaci-
tor C6.
When the COMP pin voltage reaches Overload Protection
Threshold Voltage-2, VCOMP(OLP)2 = 4.5 V, the on-time is set to
the Leading Edge Blanking time, tBW = 500 ns. Meanwhile, the
capacitor charging is ongoing and when it reaches Overload Pro-
tection Threshold Voltage-1, VCOMP(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 39. COMP pin peripheral circuit
Figure 40. Waveforms when OLP is being activated (LC551xD)
Rocp
S/GND OCP
1
C6
LC551x D
4
COMP
7VReg
3
S/GND
GND(ID)
VCC(ON) = 15.1 V
VCC(BIAS)1 = 11.0 V
VCC(OFF) = 9.4 V
VCOMP(OLP)1 = 5.5 V
VCOMP(OLP)2 = 4.5 V
VCOMP(MIN) = 0.9 V
VCC
OLP detect
VCOMP
ID
Restart
Time
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