mic38c44a Micrel Semiconductor, mic38c44a Datasheet
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mic38c44a
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mic38c44a Summary of contents
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... MIC38C42A, MIC38C43A (96% max. duty cycle) versions only † ‡ MIC38C44A, MIC38C45A (50% max. duty cycle) versions only MM8 is a trademark of Micrel, Inc. Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com ...
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... MIC38C45AYMM –40°C to +85°C UVLO Thresholds Startup 8.4V Startup 14.5V Minimum Operating 7.6V Minimum Operating 9V MIC38C43A MIC38C42A MIC38C45A MIC38C44A 2 Micrel, Inc. Package 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin MM8™ 8-pin MM8™ 8-pin MM8™ ...
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MIC38C42A/43A/44A/45A Pin Configuration Pin Description Pin Number Pin Name 1 COMP ISNS 4 RT/CT 5 GND 6 OUT 7 VDD 8 VREF April 2005 MIC38C4xA COMP 1 8 VREF VDD ISNS 3 6 OUT ...
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MIC38C42A/43A/44A/45A Absolute Maximum Ratings Supply Voltage (V ) .................................................... 20V DD Switch Supply Voltage (V ) .......................................... 20V D Current Sense Voltage (V ) ..................... –0.3V to 5.5V ISNS Feedback Voltage (V ) ................................ –0.3V to 5.5V FB Output Current ...
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... Note 4: Adjust V above the start threshold before setting at 15V. DD Note 5: Output frequency equals oscillator frequency for the MIC38C42 and MIC38C43. Output frequency for the MIC38C44A, and MIC38C45A equals one half the oscillator frequency. Note 6: Specification for packaged product only. April 2005 = 5V, Note 2 ≤ ...
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MIC38C42A/43A/44A/45A Typical Characteristics Oscillator Frequency Configuration 100 200pF 470pF 1nF 10 1.8nF 4.7nF 10nF V = 15V 1x10 1x10 5x10 OSCILLATOR FREQUENCY (Hz) Current Sense Amplifier vs. Error Amplifier Output 1.2 1.0 125°C 0.8 0.6 ...
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MIC38C42A/43A/44A/45A Application Information Familiarity with 384x converter designs is assumed. MIC38C4x Advantages Start-up Current Start-up current has been reduced to an ultra-low 50µA (typical) permitting higher-valued, lower-wattage, start-up resistors (powers controller during power supply start-up). The reduced resistor wattage reduces ...
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MIC38C42A/43A/44A/45A Magnetic components are carefully chosen for minimal loss at 500kHz. CT1 and T1 are wound on Magnetics, Inc. P-type material toroids wound on a Siemens N49 EFD core. Test Conditions Line Regulation V = 26V to 80V, ...
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MIC38C42A/43A/44A/45A Package Information 0.026 (0.65) 0.157 (3.99) 0.150 (3.81) 0.064 (1.63) 0.045 (1.14) 0.122 (3.10) 0.112 (2.84) 0.036 (0.90) 0.032 (0.81) 0.012 (0.03) 0.0256 (0.65) TYP MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 ...