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RT2910A Folha de dados(PDF) 13 Page - Richtek Technology Corporation |
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RT2910A Folha de dados(HTML) 13 Page - Richtek Technology Corporation |
13 / 20 page RT2910A Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS2910A-00 August 2017 www.richtek.com 13 Application Information The RT2910A is a PWM inverting converter integrates HV power switch driver. Features of the inverting converters include programmable constant switching frequency, current mode topology with slope compensation in case of sub-harmonic at over 50% duty cycle operation , internal linear regulator , and internal 0.6V NFB reference with soft-start control allows output voltage to be precisely regulated at adjustable output voltage .Protection features include adjustable current limit and over-temperature protection. The HV power switch is suited for hot swap applications as an over-voltage protection regulator with programmable current limit threshold equals 50mV that drives an external N-MOSFET as the pass transistor. It features a TMR function for over-voltage protection and over-current protection to avoid N-Channel MOSFET damaged. It operates from a wide supply voltage range of 5V to 60V. The internal charge pump circuit is included to turn on the N-Channel MOSFET to supply current to the loads with very little power loss. HV Power Switch Driver Over-Voltage Protection The RT2910A is equipped with over-voltage protection (OVP) function. When the voltage at FB pin exceeds a threshold of approximate 1.25V, the MOSFET is turned off. The MOSFET can be turned on again once the voltage at FB pin drops below 1.25V During this period, the N-MOSFET is still on, and continues to supply current to the load. This allows uninterrupted operation during short over-voltage transient events. When the voltage regulation loop is engaged for longer than the time-out period, set by the timer capacitor connected from the TMR pin to ground, the GATE pin is pulled low to turn off the MOSFET. This prevents the N-MOSFET from being damaged during a long period of over-voltage. The OVP voltage can be set by the following equation: VOUT_OVP = 1.25 x (1 + R3 / R4) Where, R3 and R4 are the voltage divider from VOUT to GND with the divider center node connected to FB pin. Over-Current Protection The RT2910A features an adjustable current limit that protects against short circuits or excessive load current. During an over-current event, the GATE pin is regulated to limit the current sense voltage between the VHV and SNS pins to 50mV. The current limit is set by the following equation: ILIM = 50mV/RSNS An over-current fault occurs when the current limit circuitry has been engaged for longer than the time-out delay set by the TMR pin timer capacitor. The GATE pin is then immediately pulled low to GND turning off the MOSFET. Fault Timer The RT2910A includes an adjustable fault timer pin. Connecting a capacitor from the TMR pin to ground sets the delay timer period before the MOSFET is turned off. The same capacitor also sets the cool off period before the MOSFET is allowed to turn back on after the fault condition has disappeared. The TMR pin should be tied to ground if this feature is not used. Once a fault condition, either over-voltage or over- current event, is detected, a current source charges up the TMR capacitor. The timer charge up current is fixed around 25 A. When the voltage at the TMR pin, reaches the 0.6V threshold, 1. POK pin is pulled low. 2. The ENHV pin is pulled low. 3. The VGATE_OUT is pulled low. 4. CFDLY start to charge , when VTMR drop to 0.2V. 5. POK pin is pulled high again. The fault sequence is as Figure 1. |
Nº de peça semelhante - RT2910A |
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Descrição semelhante - RT2910A |
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