RT2910A Datasheet, PDF (1/20 Pages) Richtek Technology Corporation – High Efficiency Inverting PWM Converter with Surge Stopper

RT2910A
High Efficiency Inverting PWM Converter with Surge Stopper
General Description
The RT2910A is a PWM inverting converter integrates
HV (High Voltage) Switch Driver. The HV switch driver
protects loads from high voltage transients. It regulates
the output during an over-voltage event, by controlling
the Gate of an external N-MOSFET. The output is
limited to a safe value thereby allowing the loads to
continue functioning. The RT2910A also monitors the
voltage drop between the VHV and SNS pins to protect
against over-current faults. An internal amplifier limits
the current sense voltage to 50mV. If the fault condition
persists, the MOSFET is turned off. After a certain
cooling off period, the gate is allowed to go up and turn
on the MOSFET again. Moreover, the HV switch driver
also can support back to back FETs application to
prevent reverse leakage current from output.
The high-efficiency PWM inverting converter allows
designers to implement compact, low noise, negative
output DC-DC converters. This device operates from
+4V to +7V input voltage and generates 500mV to
12.5V output. To minimize switching noise, it features
a current-mode, constant frequency PWM control
scheme. The operating frequency can be set from
300kHz to 800kHz through a resistor.
Features
 HV Switch Driver
► Adjustable Output Clamp Voltage
► Over-Current Protection
► Wide Operation Range : 5V to 60V
► Reverse Input Protection to −60V
► Adjustable Fault Timer
► Support N-MOSFET
 Inverting PWM Converter
► 12.5V to 0.5V Output
► Integrate High-Side P-MOSFET
► 300kHz to 800kHz Switching Frequency
► Current-Mode PWM Control
► Internal Soft-Start
► Power Ok Indicator
Applications
 Ga-N MOSFET Bias
 Positive to Negative Conversion
 Industrial and Telecom Power Supplies
 Distributed Power System
Simplified Application Circuit
VHV
V_IN
SNS ^GATE OUT
VHV _RT2910A FB
VIN
LX
VB
RT
CS
COMP
PGND
FDLY
NFB
VL
SFB
5VDET
VREF
ENHV
TMR
POK _GND
V_OUT
NV_OUT
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
DS2910A-00 August 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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