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RT2910A Folha de dados(PDF) 13 Page - Richtek Technology Corporation

Nome de Peças RT2910A
Descrição Electrónicos  High Efficiency Inverting PWM Converter with Surge Stopper
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Fabricante Electrônico  RICHTEK [Richtek Technology Corporation]
Página de início  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT2910A Folha de dados(HTML) 13 Page - Richtek Technology Corporation

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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.


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