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XC9505B092A Datasheet(PDF) 10 Page - Torex Semiconductor |
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XC9505B092A Datasheet(HTML) 10 Page - Torex Semiconductor |
10 / 47 page Notes on how to use Hint on application 1. Channel 2 ( Inverting ) Soft start circuit > Example of typical application circuit : Improved Soft start Time to make soft start time is calculated by the equation below. Example ) When VOUT1 = 3.3V and VOUT2 = - 7.5V, RFB21 = 350k Ω, RFB22 = 100kΩ by the equation below. VOUT2 = (0.9 - VOUT1) x (RFB21 / RFB22) + 0.9 When the light load, CFB21=0.1 µF or lower value can be used. Therefore, when CFB21=0.027 µF, Time_ss2 = 5.0mS and VOUT2 = 95% of setting value 2. Channel 2 (Inverting) Withstand voltage of transistor The voltage applied between the drain and source is the sum of VIN and VOUT 2. Select a transistor with an absolute VDSS rating that is suitable for your operating conditions. Example: The voltage applied across VDS of a transistor will be 20.0V if VIN = 5.0 V and VOUT 2 = -15.0 V. This example is effective when EN 1 and EN 2 are enabled with different timings under light load condition (the coil current being discontinuous). Under this condition, a transistor with VDSS higher than 20.0V should be selected. (Use a transistor with VDSS that is 1.5 times the applied voltage or more, as a standard.) Channel 2 (inverting) is subject to the overshoot of output voltage 2 (VOUT 2) at start-up. It is possible to control the overshoot of output voltage 2 (VOUT 2), as shown by circuit example 1 in “Output Voltage Settings for Channel 2” in “Function Settings.” In this circuit configuration, EN 1 and EN 2 are enabled (set to “H” level) simultaneously. This lets output voltage 1 (VOUT 1) of channel 1 increase gently as soft start, thereby controlling the overshoot. XC9505 Series 2ch. Step-Down / Inverting DC/DC Controller ICs SBD2 VOUT1 FB2 Inside of XC9505 IC RFB21 CFB21 VOUT2 CL2 RFB22 EN2 ON/OFF signal Pch MOSFET1 R1 Nch MOSFET2 Time SS2 = - R FB21 x C CFB21 / Ln 1 - (0.9 - V OUT2 ) x R FB22 ) (V OUT1 - 0.9) x R FB21 10 |
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