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FSDM0265RNB Datasheet(PDF) 12 Page - Fairchild Semiconductor |
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FSDM0265RNB Datasheet(HTML) 12 Page - Fairchild Semiconductor |
12 / 20 page 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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