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LADLD30G-SH2-R Datasheet(PDF) 7 Page - Unisonic Technologies |
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LADLD30G-SH2-R Datasheet(HTML) 7 Page - Unisonic Technologies |
7 / 8 page LADLD30 Preliminary CMOS IC UNISONICTECHNOLOGIESCO.,LTD 7 of 8 www.unisonic.com.tw QW-R502-330.c APPLICATION INFORMATION 1. Power Sequencing When there’s no main voltage applied at VIN, it is suggested not to apply a voltage to VOUT for a long time. Because the internal parasitic diode (between VOUT to VIN) will conduct and dissipate power, there’s no protection. 2. Output Capacitor A proper output capacitor to maintain stability and improve transient response over temperature and current is necessary. Proper ESR (equivalent series resistance) and capacitance of the output capacitor should be selected properly for stability of the normal operation and good load transient response. Many kinds of capacitors can be used as an output capacitor, such as ultra-low-ESR capacitors (like ceramic chip capacitors), low-ESR bulk capacitors (like solid Tantalum, POSCap, and Aluminum electrolytic capacitors). And also the value of the output capacitors’ can be increased without limit. In the applications with large stepping load current, the low-ESR bulk capacitors are normally recommended. Decoupling ceramic capacitors are recommended to be placed at the load and ground pins very closely and also the impedance of the layout must be minimized. 3. Input Capacitor In order to prevent the input rail from dropping, the proper input capacitor to supply current surge during stepping load transients is required. Because the limited slew rate of the surge currents, more parasitic inductance needs more input capacitance. Ultra-low-ESR capacitors (>100mF, ESR<300mW) is recommended for the input capacitor. 4. Feedback Network The following figure shows the feedback network between VOUT GND and FB pins. Working with the internal error amplifier, the feedback network can provide proper frequency response for the UTC LADLD30. R1 R2 ESR VOUT FB C1 VOUT VFB VERR VREF EAMP COUT |
Similar Part No. - LADLD30G-SH2-R |
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Similar Description - LADLD30G-SH2-R |
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