JAJSAH6H January 2006 – October 2017 LM3100
PRODUCTION DATA.
The start-up regulator is integrated within LM3100. The input pin (VIN) can be connected directly to line voltage up to 36 V, with transient capability of 40 V. The VCC output regulates at 6 V, and is current limited to 65 mA. Upon power up, the regulator sources current into the external capacitor at VCC (CVCC). CVCC must be at least 680 nF for stability. When the voltage on the VCC pin reaches the under-voltage lockout threshold of 3.75 V, the buck switch is enabled and the Soft-start pin is released to allow the soft-start capacitor (CSS) to charge.
The minimum input voltage is determined by the dropout voltage of VCC regulator, and the VCC UVLO falling threshold (≊3.7 V). If VIN is less than ≊4.0 V, the VCC UVLO activates to shut off the output.