DL0165R 查看數據表（PDF） - Fairchild Semiconductor

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DL0165R

Green Mode Fairchild Power Switch (FPS)

Fairchild Semiconductor 

FSDL0165RN

CISPR2QB

CISPR2AB

5uA

Feed

Back

3

Current

4

Limit

AKΩ

900uA

2KΩ

0.8KΩ

Rsense

PWM

comparator

SenseFET

Sense

Frequency (MHz)

Figure 12. KA5-series FPSTM Full Range EMI scan(67KHz,

no Frequency Modulation) with DVD Player SET

CISPR2QB

CISPR2AB

Figure 14. Peak current adjustment

For example, FSDx0265RN has a typical Sense FET current

limit (IOVER) of 2.15A. The Sense FET current can be limited to

1A by inserting a 2.8kΩ between the current limit pin and

ground which is derived from the following equations:

2.15: 1 = 2.8KΩ : XKΩ ,

X = 1.3KΩ,

Since X represents the resistance of the parallel network, Y

can be calculated using the following equation:

Y = X / (1 - (X/2.8KΩ))

Frequency (MHz)

Figure 13. FSDX-series FPSTM Full Range EMI Scan

(67KHz, with Frequency Modulation) with DVD Player SET

8. Adjusting Current limit function: As shown in fig 14, a

combined 2.8KΩ internal resistance is connected into the

non-inverting lead on the PWM comparator. A external

resistance of Y on the current limit pin forms a parallel resis-

tance with the 2.8KΩ when the internal diodes are biased by

the main current source of 900uA.

13

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