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LT1620 Datasheet(PDF) 4 Page - Linear Technology |
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LT1620 Datasheet(HTML) 4 Page - Linear Technology |
4 / 12 page 4 LT1620/LT1621 PI FU CTIO S input (across external sense resistor) equal to (VCC – VPROG)/10. Input voltage range is VCC to (VCC – 1.25V). AVG2: Sense Amplifier AV = – 20 Output and Comparator Positive Input. Used as integration node for end-of-cycle determination flag. Integration time constant is calculated using 5k Ω typical output impedance. PROG2: Comparator Negative Input. Program node for end-of-cycle determination typically used during voltage mode operation. The comparator threshold is reached when the current sense amplifier differential input voltage equals (VCC – VPROG2)/20. Input voltage range is (VCC – 0.15V) to (VCC – 2.5V). GND: Ground Reference. MODE: Comparator Open Collector Output. Output is logic low when magnitude of current sense amplifier differential input voltage is less than (VCC – VPROG2)/20. IOUT: Transconductance Amplifier Output. In typical appli- cation, IOUT sinks current from current-setting node on companion PWM controller IC, facilitating current mode loop control. FUNCTIONAL BLOCK DIAGRA – + SENSE AMPLIFIER VCC IN+ IN– PROG PROG2* 500 Ω 2.5k – + SENSE AVG AVG2* IOUT MODE* LT1620/21 • FBD gm – + 5k *AVAILABLE IN THE LT1620GN ONLY + – + – SENSE – SENSE + INTVCC ITH PWM CONTROLLER END-OF-CYCLE (ACTIVE LOW) ( ×1 GAIN) ( ×10 GAIN) ( ×20 GAIN) CURRENT SENSE RESISTOR VID GND 5V OPERATION Current Sense Amplifier The current sense amplifier is a multiple output voltage amplifier with an operational input common mode range from 0V to 32V. The amplifier generates scaled output voltages at the SENSE, AVG and AVG2 (available in LT1620GN) pins. These output signal voltages are refer- enced to the VCC supply by pulling signal current through internal VCC referred resistors. (Refer to the Functional Block Diagram) The first output (SENSE) is a unity gain, level-shifted repre- sentation of the input signal (IN+ – IN–). In typical PWM/ charger type applications, this output is used to drive the current sense amplifier of the mated PWM controller IC. The other two outputs (AVG and AVG2) are internally connected to a transconductance amplifier and compara- tor, respectively. The AVG output yields a gain of 10, and the AVG2 output provides a gain of 20. These pins are |
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