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LT1936 Datasheet(PDF) 7 Page - Linear Technology |
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LT1936 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 20 page  LT1936 7 1936fd OPERATION (Refer to Block Diagram) The LT1936 is a constant frequency, current mode step- down regulator. A 500kHz oscillator enables an RS flip-flop, turning on the internal 1.9A power switch Q1. An ampli- fier and comparator monitor the current flowing between the VIN and SW pins, turning the switch off when this current reaches a level determined by the voltage at VC. An error amplifier measures the output voltage through an external resistor divider tied to the FB pin and servos the VC pin. If the error amplifier’s output increases, more current is delivered to the output; if it decreases, less current is delivered. An active clamp (not shown) on the VC pin provides current limit. The VC pin is also clamped to the voltage on the SHDN pin; soft-start is implemented by generating a voltage ramp at the SHDN pin using an external resistor and capacitor. An internal regulator provides power to the control circuitry. This regulator includes an undervoltage lockout to prevent switching when VIN is less than ~3.45V. The SHDN pin is used to place the LT1936 in shutdown, disconnecting the output and reducing the input current to less than 2μA. The switch driver operates from either the input or from the BOOST pin. An external capacitor and diode are used to generate a voltage at the BOOST pin that is higher than the input supply. This allows the driver to fully saturate the internal bipolar NPN power switch for efficient opera- tion. The oscillator reduces the LT1936’s operating frequency when the voltage at the FB pin is low. This frequency foldback helps to control the output current during startup and overload. |
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