MIC38C43AYM Micrel Inc, MIC38C43AYM Datasheet
MIC38C43AYM
Specifications of MIC38C43AYM
MIC38C43AYM
Available stocks
Related parts for MIC38C43AYM
MIC38C43AYM Summary of contents
Page 1
MIC38C42A/43A/44A/45A General Description The MIC38C4xA are fixed frequency, high performance, current-mode PWM controllers. Micrel’s BiCMOS devices are pin compatible with 384x bipolar devices but feature several improvements. Undervoltage lockout circuitry allows the ’42 and ’44 versions to start up at ...
Page 2
... MIC38C43AYM –40°C to +85°C MIC38C44AYM –40°C to +85°C MIC38C45AYM –40°C to +85°C MIC38C42AYMM –40°C to +85°C MIC38C43AYMM –40°C to +85°C MIC38C44AYMM –40°C to +85°C MIC38C45AYMM –40°C to +85°C UVLO Thresholds Startup 8.4V Startup 14.5V Minimum Operating 7 ...
Page 3
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 ...
Page 4
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 ...
Page 5
MIC38C42A/43A/44A/45A Parameter Test Conditions Current Sense Gain Notes 2, 3 MaximumThreshold V COMP PSRR 12 ≤ V Input Bias Current Delay to Output Output R High I DS(ON) SOURCE R Low I DS(ON) SINK Rise Time T A Fall Time ...
Page 6
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 ...
Page 7
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 ...
Page 8
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, ...
Page 9
... TYP MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...