FAN7529MX【PDF 13/20 页】IC PFC CTRLR CRM/TRANSITION 8SOP

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Sheet目录38

9页 10页 11页 12页 [13页]14页 15页 16页 17页

?2006 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN7529 Rev. 1.0.2

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.

Figure 36. Over-Current Protection Block

5. Switch Drive Block

The FAN7529 contains a single totem-pole output stage

designed for 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 if the V

voltage is higher than 13V.

6. Under-Voltage Lockout Block

If the V

voltage reaches 12V, the ICs internal blocks

are enabled and start operation. If the V

voltage drops

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

reduce the operating current. V

voltage should be

higher than 8.5V under normal conditions.

8pF

40k

Over Current Protection

Comparator

0.8V

OCP

Signal

FAN7529 Rev. 00

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