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MIC38C42-1BN Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC38C42-1BN Datasheet(HTML) 8 Page - Micrel Semiconductor |
8 / 11 page MIC38C42/3/4/5 Micrel, Inc. M9999-091107 8 September 2007 Symbol Custom Coil1 ETS2 CT1 4923 ETS 92420 T1 4924 ETS 92419 L1 4925 ETS 92421 1. Custom Coils, Alcester, SD tel: (605) 934-2460 2. Energy Transformation Systems, Inc. tel: (415) 324-4949. Test Conditions Results Line Regulation VIN = 26V to 80V, IO = 2A 0.5% Load Regulation VIN = 48V, IO = 0.2A to 2A 0.6% Efficiency VIN = 48V, IO = 2A 90% Output Ripple VIN = 48V, IO = 2A (20MHz BW) 100mV Synchronous Buck Converter Refertofigure2. ThisMIC38C43synchronousbuckconverter uses an MIC5022 half-bridge driver to alternately drive the PWMswitchMOSFET(drivenbyGATEH,orhigh-sideoutput) and a MOSFET which functions as a synchronous rectifier (driven by the GATEL, or low-side output). The low-side MOSFET turns on when the high-side MOS- FET is off, allowing current to return from ground. Current flows through the low-side MOSFET in the source to drain direction. The on-state voltage drop of the low-side MOSFET is lower than the forward voltage drop of an equivalent Schottky recti- fier. This lower voltage drop results in higher efficiency. A sense resistor (5mΩ) is connected to the driver’s high- side current sense inputs to provide overcurrent protection. Refer to the MIC5020, MIC5021, and MIC5022 data sheets for more information. Figure 2. 100kHz, Synchronous Buck Converter MIC38C43 0.1µF 300k 4.3k VOUT 5V, 8A 0.15µF 35µH 1000µF Low ESR 0.1µF SMP60N06-14 VDD V R E F GND COM P VOUT RT/CT F B I S N S 4.7nF 10k 10k 6.8k 47k 3.3k 2200 pF 470µF 25V MIC5022 VB GAT E H SH+ GAT E L SH– SL+ C T GND E N FLT VDD +12V 5mΩ 0.1µF* MKS2 *Locate near the MIC38C43 supply pins. NC NC IN NC S L– |
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