FAN7530 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN7530

Critical Conduction Mode PFC Controller

Fairchild Semiconductor 

4. Over-Current Protection Block

The MOSFET current is sensed using an external sens-

ing resistor for the over-current protection. If the CS pin

voltage is higher than 0.8V, the over-current protection

comparator generates a protection signal. An internal RC

filter is included to filter switching noise.

CS 4

40k

8pF

OCP

Signal

0.8V

Over-Current Protection

Comparator

FAN7529 Rev. 00

Figure 36. Over-Current Protection Block

5. Switch Drive Block

The FAN7530 contains a single totem-pole output stage

designed for a direct drive of the power MOSFET. The

drive output is capable of up to +500/-800mA peak cur-

rent with a typical rise and fall time of 50ns with 1nF load.

The output voltage is clamped to 13V to protect the

MOSFET gate even if the VCC voltage is higher than

13V.

6. Under-Voltage Lockout Block

If the VCC voltage reaches 12V, the IC’s internal blocks

are enabled and start operation. If the VCC voltage drops

below 8.5V, most of the internal blocks are disabled to

reduce the operating current. VCC voltage should be

higher than 8.5V under normal conditions.

© 2006 Fairchild Semiconductor Corporation

FAN7530 Rev. 1.0.2

13

www.fairchildsemi.com

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