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AMS34063 Fiches technique(PDF) 6 Page - Advanced Monolithic Systems |
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AMS34063 Fiches technique(HTML) 6 Page - Advanced Monolithic Systems |
6 / 7 page Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS34063 APPLICATION HINTS Design Formula Table Calculation Step-Down Step-Up OFF ON t t OUT SAT IN(MIN) F OUT V - V - V V V + V - V V - V V SAT IN(MIN) IN(MIN) F OUT + (tON + tOFF) MAX MIN f 1 MIN f 1 CT 4 x 10 -5t ON 4 x 10 -5t ON IPK(switch) 2IOUT(MAX) ( ) + OFF OFF ON MAX OUT t t t 2I RSC 0.33/IPK(switch) 0.33/IPK(switch) L(MIN) ) ON(MAX PK(switch) OUT SAT IN(MIN) t I V V V − − ) ON(MAX PK(switch) SAT IN(MIN) t I V V − CO P) ripple(P OFF ON PK(switch) 8V ) t (t I − + ripple ON OUT V t I ≈ VSAT = Saturation voltage of the output switch. VF = Forward voltage drop of the ringback rectifier. Notes The following power supply characteristics must be chosen: VIN – Nominal input voltage. If this voltage is not constant, then use VIN(MAX) for step-down and VIN(MIN) for step-up converter. VOUT – Desired output voltage, + = 1 2 OUT R R 1 1.25 V . IOUT - Desired output current. fMIN - Minimum desired output switching frequency at the selected values for VIN and IO. Vripple(P-P) – Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor’s equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation. |
Numéro de pièce similaire - AMS34063 |
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Description similaire - AMS34063 |
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