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LT1431MJ8 Datasheet(PDF) 6 Page - Linear Technology |
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LT1431MJ8 Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page 6 LT1431 APPLICATIO S I FOR ATIO Frequency Compensation As a shunt regulator, the LT1431 is stable for all capacitive loads on the COLL pin. Capacitive loading between 0.01 µF and 18 µFcausesreducedphasemarginwithsomeringing 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. This can be compensated with capaci- tance between COLL and REF (phase lead). More compli- cated feedback loops may require shaping of the fre- quency response of the LT1431 with dominant pole or pole-zero compensation. This can be accomplished with a capacitor or series resistor and capacitor between COLL and COMP. The compensation schemes mentioned above use voltage feedback to stabilize the circuits. There must be voltage gain 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 effectiveness of the compensation schemes, but also decreasing their necessity. VIN RL 2.5V LT1431 • TA02 CATHODE REF LT1431Z ANODE VIN RL 2.5V LT1431 • TA03 COLL REF LT1431 GND-F V+ GND-S 2.5V Reference 3-Pin Package 2.5V Reference 8-Pin Package 5V Reference Increasing 5V Reference Programmable Reference with Adjustable Current Limit TYPICAL APPLICATIO 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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