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LT3797EUKGPBF Datasheet(PDF) 10 Page - Linear Technology |
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LT3797EUKGPBF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 36 page  LT3797 10 3797f For more information www.linear.com/LT3797 PIN FUNCTIONS EN/UVLO (Pin 51): Enable and Undervoltage Lockout Pin. An accurate 1.22V falling threshold with externally programmable hysteresis detects when power is OK to en- able the integrated INTVCCpowersupplyandeachchannel switching. Rising hysteresis is generated by the external resistor divider and an accurate internal 2μA pull-down current. Above the 1.24V (typical) rising threshold (but below 2.5V), EN/UVLO input bias current is sub-μA. Below the 1.22V (typical) falling threshold, a 2μA pull-down cur- rent is enabled so the user can define the hysteresis with the external resistor selection. An undervoltage condition turns off the integrated INTVCC power supply and all the three channels and resets the soft-starts. Tie to 0.4V, or less, to disable the device and reduce VIN quiescent cur- rent below 1μA. OVLO (Pin 52): Overvoltage Lockout Pin. An accurate 1.25V rising threshold with 125mV hysteresis detects an overvoltage condition. An overvoltage condition turns off all three channels (including pulling the GATE pins to GND and TG pins to ISP) and resets the soft-starts. Tie OVLO to GND if not used. GND (Exposed Pad Pin 53): Ground. Solder the exposed pad directly to ground plane. |
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