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LT1431CS8-PBF Datasheet(PDF) 7 Page - Linear Technology |
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LT1431CS8-PBF Datasheet(HTML) 7 Page - Linear Technology |
7 / 14 page LT1431 1431fd applicaTions inForMaTion Typical applicaTions Frequency Compensation As a shunt regulator, the LT1431 is stable for all capacitive loads on the COLL pin. Capacitive loading between 0.01µF and 18µF causes reduced phase margin with some ringing under transient conditions. Output capacitors should not be used arbitrarily because output noise is not necessarily reduced. Excess capacitance on the REF pin can introduce enough phase shift to induce oscillation when configured as a reference>2.5V.Thiscanbecompensatedwithcapacitance between COLL and REF (phase lead). More complicated feedback loops may require shaping of the frequency response of the LT1431 with dominant pole or pole-zero compensation.Thiscanbeaccomplishedwithacapacitoror series resistor and capacitor between COLL and COMP. The compensation schemes mentioned above use voltage feedbacktostabilizethecircuits.Theremustbevoltagegain at the COLL pin for them to be effective, so the COLL pin must see a reasonable AC impedance. Capacitive loading of the COLL pin reduces the AC impedance, voltage gain, and frequency response, thereby decreasing the effective- ness of the compensation schemes, but also decreasing their necessity. 2.5V Reference 3-Pin Package 2.5V Reference 8-Pin Package 5V Reference Increasing 5V Reference Programmable Reference with Adjustable Current Limit VIN RL 2.5V LT1431 TA02 CATHODE REF LT1431Z ANODE VIN RL 2.5V LT1431 TA03 COLL REF LT1431 GND-F V+ GND-S VIN RL 5V LT1431 TA04 COLL REF LT1431 GND-F V+ GND-S RTOP RMID VIN RL 5V + ∆ LT1431 TA05 R ∆ = R • (0.5mA) ±25% PROCESS TOLERANCE ∆ ≤ 500mV COLL REF LT1431 GND-F V+ GND-S RTOP RMID VIN RL LT1431 TA06 RLIM VOUT = ( ) 1 + R1 R2 VREF R1 R2 ILIMIT = 0.7 RLIM + 3.6 AT 25°C COLL REF LT1431 GND-F V+ GND-S |
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