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LT1576C Datasheet(PDF) 8 Page - Linear Technology |
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LT1576C Datasheet(HTML) 8 Page - Linear Technology |
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8 / 28 page  8 LT1576/LT1576-5 APPLICATIONS INFORMATION – + – + Σ INPUT 2.9V BIAS REGULATOR 200kHz OSCILLATOR FREQUENCY SHIFT CIRCUIT VSW FB VC LOCKOUT COMPARATOR GND 1576 BD SLOPE COMP 0.025 Ω BIAS INTERNAL VCC CURRENT SENSE AMPLIFIER VOLTAGE GAIN = 35 SYNC SHDN SHUTDOWN COMPARATOR CURRENT COMPARATOR ERROR AMPLIFIER gm = 1000µMho FOLDBACK CURRENT LIMIT CLAMP BOOST RS FLIP-FLOP DRIVER CIRCUITRY S R 0.8V Q2 Q1 POWER SWITCH 1.21V 2.44V – + 0.4V 3.5 µA Figure 1. Block Diagram BLOCK DIAGRAM FEEDBACK PIN FUNCTIONS The feedback (FB) pin on the LT1576 is used to set output voltage and provide several overload protection features. The first part of this section deals with selecting resistors to set output voltage and the remaining part talks about foldback frequency and current limiting created by the FB pin. Please read both parts before committing to a final design. The fixed 5V LT1576-5 has internal divider resis- tors and the FB pin is renamed SENSE, connected directly to the output. The suggested value for the output divider resistor (see Figure 2) from FB to ground (R2) is 5k or less, and a formula for R1 is shown below. The output voltage error caused by ignoring the input bias current on the FB pin is less than 0.25% with R2 = 5k. A table of standard 1% values is shown in Table 1 for common output voltages. Please read the following if divider resistors are increased above the suggested values. R RVOUT 1 21 21 121 = − () . . |
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