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CHL8510 Datasheet(PDF) 9 Page - International Rectifier

Part # CHL8510
Description  12V High Performance Gate Driver
Download  15 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

CHL8510 Datasheet(HTML) 9 Page - International Rectifier

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September 17, 2012 | FINAL | V1.11
9
IR3537
CHL8510
12V High Performance Gate Driver
GENERAL DESCRIPTION
The IR3537/CHL8510 is a high efficiency, fast MOSFET
driver with large source and sink current capability. It can
reliably drive the external high- and low-side N-channel
MOSFETs with large input capacitance at switching
frequencies up to 1MHz. The proprietary IR Active Tri-Level
(ATL) feature allows complete control over enable and
disable of both MOSFETs using the PWM input signal from
the controller. The driver is also compatible with a generic
tri-state PWM signal. The Active Tri-Level or tri-state is
selectable by the MODE pin.
During normal operation the PWM transitions between
low and high voltage levels to drive the low- and high-side
MOSFETs. The PWM signal falling edge transition to a low
voltage threshold initiates the high-side driver turn off
after a short propagation delay, tPDL(HS). The dead time
control circuit monitors the HI_GATE and switch voltages
to ensure the high-side MOSFET is turned off before the
LO_GATE voltage is allowed to rise to turn on the low-side
MOSFET.
The PWM rising edge transition through the high-side turn-
on threshold initiates the turn off of the low-side MOSFET
after a small propagation delay, tPDL(LS). The adaptive dead
time circuit provides the appropriate dead time by
determining if the falling LO_GATE voltage threshold has
been crossed before allowing the HI_GATE voltage to rise
and turn on the high-side MOSFET, tPDH(HS).
THEORY OF OPERATION
POWER-ON RESET (POR)
The IR3537/CHL8510 incorporates a power-on reset
feature. This ensures that both the high- and low-side
output drivers are made active only after the device supply
voltage has exceeded a certain minimum operating
threshold. The Vcc supply is monitored and both the
drivers are set to the low state, holding both external
MOSFETs off. Once Vcc crosses the rising POR threshold,
the IR3537/CHL8510 is reset and the outputs are held in
the low state until a transition from tri-state to active
operation is detected at the PWM input. During normal
operation the drivers continue to remain active until the
Vcc falls below the falling POR threshold.
These POR voltage threshold levels allow seamless
functionality with International Rectifier’s digital
controllers, such that the drivers are always active before
the controller starts to provide the PWM signal and are
inactive only after the controller shuts down.
INTEGRATED BOOTSTRAP DIODE
The IR3537/CHL8510 features an integrated bootstrap
diode to reduce external component count. This enables
the IR3537/CHL8510 to be used effectively in cost and
space sensitive designs.
The bootstrap circuit is used to establish the gate voltage
for the high-side driver. It consists of a diode and capacitor
connected between the SWITCH and BOOT pins of the
device. Integrating the diode within the IR3537/CHL8510,
results in the need for an external boot capacitor only.
The bootstrap capacitor is charged through the diode and
injects this charge into the high-side MOSFET input
capacitance when PWM signal goes high.
PWM MODE SELECTION
The IR3537/CHL8510 features a MODE pin which
allows operation with different PWM signal levels.
The IR3537/CHL8510 is capable of driving external
MOSFETs based on one of two different tri-level PWM
input signals from a controller.
Floating the MODE pin enables the IR3537/CHL8510 to
switch external FETs based on the IR Active Tri-Level mode.
In ATL mode, the PWM voltage level is from 0V to 1.8V for
low to high transitions. A PWM voltage level greater than
the tri-state HI_GATE threshold disables switching of both
MOSFETs. Grounding the MODE pin enables the


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