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FSDM0265RNB Datasheet(PDF) 12 Page - Fairchild Semiconductor

No. de pieza FSDM0265RNB
Descripción Electrónicos  Green Mode Fairchild Power Switch (FPS)
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FSDM0265RNB Datasheet(HTML) 12 Page - Fairchild Semiconductor

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FSDM0265RNB
12
8. Adjusting Peak Current Limit : As shown in Figure 12,
a combined 2.8k
Ω internal resistance is connected to the
non-inverting lead on the PWM comparator. A external
resistance of Rx on the current limit pin forms a parallel
resistance with the 2.8k
Ω when the internal diodes are
biased by the main current source of 900uA.
Figure 12. Peak Current Limit Adjustment
For example, FSDM0265RNB has a typical Sense FET peak
current limit (ILIM) of 1.5A. ILIM can be adjusted to 1A by
inserting Rx between the Ipk pin and the ground. The value
of the Rx can be estimated by the following equations:
1.5A : 1A = 2.8k
Ω : XkΩ ,
X = Rx || 2.8k
Ω .
(X represents the resistance of the parallel network)
3
Vcc
Vcc
I
DELAY
I
FB
2kΩ
Vfb
PWM
Comparator
4
Ipk
0.8kΩ
Rx
SenseFET
Current
Sense
900uA
5uA


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