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LT1950 Datasheet(PDF) 8 Page - Linear Technology |
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LT1950 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 20 page  LT1950 8 1950fa The LT1950 is a constant frequency, current mode con- troller for DC/DC forward, boost, flyback and SEPIC con- verter applications. The Block Diagram in Figure 1 shows all of the key functions of the IC. In normal operation, a VIN voltage as low as 3V allows an internal switcher at the BOOST pin to generate a separate BLOCK DIAGRA OPERATIO Figure 1. LT1950 Block Diagram – + VREF = INTERNAL + EXTERNAL SUPPLY VIN2 2.5V (SOURCE 2.5mA EXTERNALLY) 1.23V (VIN) (2.6V) U/V LOCKOUT (VIN2) (8V) U/V LOCKOUT (100-500)khz (105/VSEC)% OSC (TYPICAL 200kHz) 7 15 16 14 12 13 11 6 4 3 5 10 8 1 9 2 SHDN SYNC ROSC SLOPE 1.32V 1.23V MAX DC CLAMP SLOPE COMP RAMP S Q R BLANKING FB COMP GND BLANK VREF VIN VSEC BOOST VIN2 SWITCHING PREREGULATOR FIXED OFF TIME (125mA CURRENT LIMIT) PGND DISABLE – + CURRENT SENSE CMP BLANKING OVERRIDE CMP GATE PGND ISENSE ±1A DRIVER 13V ENABLE 11V 8V 1950 BD 3µA ERROR AMPLIFIER VOLTAGE GAIN = 85dB 125mV 0mV – >100mV 11V supply at VIN2 using a small surface mount external inductor, diode and capacitor. Since VIN2 supplies the output driver of the IC, this architecture achieves high GATE drive for an external N-channel power MOSFET even though VIN voltage is very low. High GATE drive capability reduces MOSFET RDS(ON) for improved efficiency, |
Similar Part No. - LT1950_15 |
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Similar Description - LT1950_15 |
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