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
OUT
GATE
SNS
OUT
FB
V
IN
VHV
RT2910A
VIN
VB
RT
LX
+
NV
OUT
CS
COMP
PGND
FDLY
NFB
VL
SFB
5VDET
ENHV
POK
GND
VREF
TMR
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2910A-00
August 2017
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
