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RT2910A датащи(PDF) 4 Page - Richtek Technology Corporation |
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RT2910A датащи(HTML) 4 Page - Richtek Technology Corporation |
4 / 20 page RT2910A Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS2910A-00 August 2017 4 Functional Block Diagram VIN + - CS 100mV + - + - 0.6V PGND NFB SFB Reference OC COMP VB LX LDO VL RT 10µA VL 1.25V + - FDLY POK VREF GND Control Circuitry + - + - 0.6V 1.4V VHV + - + - 1.25V TMR FB Current Limit OUT GATE SNS VHV ENHV CP_EN Fault 1µA + - 1V 5VDET + - 0.6V TMR Operation HV Power-Switch The HV power switch embedded an over-voltage protection regulator that drives an external N-MOSFET only as the pass transistor. It can operate within a wide supply voltage range from 5V to 60V. The internal charge pump turns on the N-MOSFET to supply current to the loads with very little power loss. This improves the efficiency and increases the available supply voltage level to the load circuitry. Normally, the pass transistor is fully on, powering the loads with very little voltage drop. When the supply voltage surges too high, the Voltage Amplifier (VA) controls the Gate of the N- MOSFET and regulates the voltage at the OUT pin to a level that is set by the external resistive divider from the OUT pin to ground and the internal 1.25V reference. If the over-voltage/current is detected, a current source starts charging up the capacitor connected at the TMR pin to ground .The pass transistor stays on until the TMR pin reaches 1.45V, at which point the GATE pin pulls low turning off the N-MOSFET. The potential at the TMR pin starts decreasing as soon as the over-voltage condition disappears. As the voltage at the TMR pin reaches 0.5V, the GATE pin begins to rise and turn on the MOSFET again. The RT2910A senses an over-current condition by monitoring the voltage across a sense resistor placed between the VHV and SNS pins. An active current limit circuit controls the GATE pin to limit the sense voltage |
Аналогичный номер детали - RT2910A |
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Аналогичное описание - RT2910A |
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