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LB1955 Scheda tecnica(PDF) 5 Page - Sanyo Semicon Device |
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LB1955 Scheda tecnica(HTML) 5 Page - Sanyo Semicon Device |
5 / 7 page VG and LIM Pin Usage No. 5452-5/7 LB1955 LIM pin: Open VG – Rf: Shorted Gm = 0.423/Rf (A/V) (Closed loop control gain) Ilim = (VREF × 27/200 – 0.2) × 4.23/3/Rf (Current limit) VG pin: Open Gm = 1/Rf (A/V) (Closed loop control gain) Ilim = (VREF ×27/200 – 0.2) ×10/3/Rf (Current limit) LIM – VREF: Shorted No current limit. Note: This current limiting function is for protection against unusual and abnormal currents. If a current limit level below the rated current is set, this will, inversely, result in heat generation within the IC. When the LIM pin is open, VG is shorted to Rf, and Rf = 0.47 Ω, this will result in a current limit level of about 1.3 to 1.4 A. If this limit falls under the rated value due to mode changes or changes in the value of the Rf resistor, set the current limit to an appropriate value by applying to the LIM pin a voltage that is divided from the VREF to ground potential by resistors of a few kΩ. Alternatively, short the LIM pin to VREF to defeat the current limit function. Output stage PG and FG Pin Output Circuits FG (FGR shorted to ground) PG (FGR shorted to PG) |
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