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ZXSC410E6TA Datasheet(PDF) 7 Page - Zetex Semiconductors |
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ZXSC410E6TA Datasheet(HTML) 7 Page - Zetex Semiconductors |
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7 / 12 page  Output voltage adjustment The ZXSC410/420 are adjustable output converters allowing the end user the maximum flexibilty. For adjustable operation a potential divider network is connected as follows: The output voltage is determined by the equation: VV 1 RA RB OUT FB =+ 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. Layout issues Layout is critical for the circuit to function in the most efficient manner in terms of electrical efficiency, thermal considerations and noise. For ‘step-up converters’ there are four main current loops, the input loop, power-switch loop, rectifier loop and output loop. The supply charging the input capacitor forms the input loop. The power-switch loop is defined when Q1 is ‘on’, current flows from the input through the inductor, Q1, RSENSE and to ground. When Q1 is ‘off’, the energy stored in the inductor is transferred to the output capacitor and load via D1, forming the rectifier loop. The output loop is formed by the output capacitor supplying the load when Q1 is switched back off. To optimise for best performance each of these loops kept separate from each other and interconnected with short, thick traces thus minimising parasitic inductance, capacitance and resistance. Also the RSENSE resistor should be connected, with minimum trace length, between emitter lead of Q1 and ground, again minimising stray parasitics. ZXSC410 ZXSC420 SEMICO NDUC TORS ISSUE 2 - May 2003 7 RB VFB GND VOUT RA STDN GND VCC DRIVE SENSE VFB EOR GND VCC DRIVE SENSE VFB ZXSC410 SOT23-6 ZXSC420 SOT23-6 CONNECTION DIAGRAMS |
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