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LB1876 Datasheet(PDF) 8 Page - Sanyo Semicon Device |
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LB1876 Datasheet(HTML) 8 Page - Sanyo Semicon Device |
8 / 14 page No. 6201-8/14 LB1876 Continued from preceding page. Pin No. Symbol Description Equivalent circuit Sets the PWM oscillator frequency. Connect a capacitor between this pin and ground. A capacitance of 1800 pF for C sets the frequency to approximately 37 kHz. 14 PWM VREG 2K Ω 200 Ω 14 VREG 300 Ω 15 Continued on next page. Current control circuit frequency characteri- stics correction. Insert a capacitor (on the order of 0.01 to 0.1 µF) between this pin and ground. The output duty is determined by the ratio of the voltage on this pin and the PWM oscillator waveform. 15 FC VREG 16 FG filter connection If noise on the FG signal is a problem, insert a capacitor (under about 2200 pF) between this pin and ground. 16 FGFIL VREG 300 Ω 17 Sets the operating time of the constraint protection circuit and also sets the initial reset pulse. A protection operating time of about 8 seconds can be set by connecting a capacitor (about 0.068 µF) between this pin and ground. If the protection circuit is not used, connect a capacitor and resistor (about 4700 pF, 220 k Ω) in parallel between this pin and ground. 17 CSD VREG 500 Ω 18 RF smoothing If noise on the RF signal is a problem, insert a capacitor between this pin and ground. 18 PH |
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