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KA3902 Fiches technique(PDF) 8 Page - Fairchild Semiconductor |
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KA3902 Fiches technique(HTML) 8 Page - Fairchild Semiconductor |
8 / 14 page FAN8902(KA3902) 8 6. Slope Compensation An unconditional instability of the inner current loop exists for any fixed frequency current-mode converter operating above 50% duty cycle. Therefore, to guarantee current loop stability, the slope of the compensation ramp must be greater than one-half of the down slope of the current waveform. The ramp voltage for slope compensation is as follow, 7. Motor Stall Current Limitation V RAMP R14 R11 ----------- = ∆V OSC × OSC FAN8902 1 6 5 TR2 R11 C2 R12 R14 Vref To PWM Comparator + _ VCMD Slop Compensation + − + − + × 5 1 14 10 12 M VBAT C1 C2 Q1 D1 IM Q2 VRS RS R5 4R R VCMD R3 C4 R2 VGS R10 I* Logic PWM COMP Buffer-OP-amp VCS VLA FAN8902 CMD + |
Numéro de pièce similaire - KA3902 |
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Description similaire - KA3902 |
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