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ZXSC420E6TA Datasheet(PDF) 7 Page - Diodes Incorporated |
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ZXSC420E6TA Datasheet(HTML) 7 Page - Diodes Incorporated |
7 / 17 page ZXSC410/ZXSC420/ZXSC440 Document number: DS33618 Rev. 5 - 2 7 of 17 www.diodes.com March 2013 © Diodes Incorporated ZXSC410/ZXSC420/ZXSC440 Application Information (cont.) Output Power Calculation By making the above assumptions for inductance and peak current the output power can be determined by: POUT = IAV x VIN x η = (Watts) where t t t t I I OFF ON DIS ON PK AV x 2 and V I t IN PK ON xL and V V I t IN IN PK DIS xL and tOFF ≈ 1.7μs (internally set by ZXSC410/420/440) and η = efficiency i.e. 100% = 1 Operating frequency can be derived by: t t OFF ON 1 f Output Adjustment The ZXSC410/420/440 are adjustable output controllers allowing the end user the maximum flexibilty. They can be used both as switching voltage regulators and as constant current regulators. A feedback voltage of 300mV provides a good compromise for both voltage and current regulation. For a constant output voltage operation a potential divider network is connected as follows: VFB VOUT GND RA RB The output voltage is determined by the equation: RB RA 1 V V FB OUT where VFB = 300mV The resistor values, RA and RB, should be maximised to improve efficiency and decrease battery drain. Optimisation can be achieved by providing a minimum current of IFB(MAX) = 200nA to the VFB pin. Output is adjustable from VFB to the (BR)VCEO of the switching transistor, Q1. Note: For the reference designs, RA is assigned the label R2 and RB the label R3. The ZXSC410/420/440 can also be used to generate a constant current between boosted output rail and the VFB pin by connecting a single resistor between VFB and GND. |
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