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PDF ADP3631 Data sheet ( Hoja de datos )
| Número de pieza | ADP3631 | |
| Descripción | 2A MOSFET Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Industry-standard-compatible pinout
High current drive capability
Precise threshold shutdown comparator
UVLO with hysteresis
Overtemperature warning signal
Overtemperature shutdown
3.3 V-compatible inputs
Rise time and fall time: 10 ns typical at 2.2 nF load
Fast propagation delay
Matched propagation delays between channels
Supply voltage: 9.5 V to 18 V
Dual outputs can be operated in parallel
(ADP3629/ADP3630)
Rated from −40°C to +85°C ambient temperature
8-lead SOIC_N and 8-lead MSOP
APPLICATIONS
AC-to-DC switch mode power supplies
DC-to-DC power supplies
Synchronous rectification
Motor drives
High Speed, Dual, 2 A MOSFET Driver
ADP3629/ADP3630/ADP3631
GENERAL DESCRIPTION
The ADP3629/ADP3630/ADP3631 are dual, high current, high
speed drivers, capable of driving two independent N-channel
power MOSFETs. The ADP3629/ADP3630/ADP3631 use the
industry-standard footprint but add high speed switching per-
formance and improved system reliability.
The ADP3629/ADP3630/ADP3631 have an internal temperature
sensor and provide two levels of overtemperature protection: an
overtemperature warning and an overtemperature shutdown at
extreme junction temperatures.
The SD function, generated from a precise internal comparator,
provides fast system enable or shutdown. This feature allows
redundant overvoltage protection, complementing the protec-
tion inside the main controller device, or provides safe system
shutdown in the event of an overtemperature warning.
The wide input voltage range allows the driver to be compatible
with both analog and digital PWM controllers.
Digital power controllers are supplied from a low voltage supply,
and the driver is supplied from a higher voltage supply. The
ADP3629/ADP3630/ADP3631 add UVLO and hysteresis func-
tions, allowing safe startup and shutdown of the higher voltage
supply when used with low voltage digital controllers.
FUNCTIONAL BLOCK DIAGRAM
VDD ADP3629/ADP3630/ADP3631
SD 1
INA, 2
INA
PGND 3
INB, 4
INB
VEN
NONINVERTING
INVERTING
NONINVERTING
INVERTING
OVERTEMPERATURE
PROTECTION
VDD
8 OTW
7 OUTA
UVLO
6 VDD
5 OUTB
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.
1 page  
ADP3629/ADP3630/ADP3631
TSD
TSD – THYS_SD
TW
TJ
NORMAL OPERATION
OT WARNING
OUTPUTS
ENABLED
OT SHUTDOWN
OUTPUTS
DISABLED
OT WARNING
OUTPUTS
ENABLED
TW – THYS_W
NORMAL OPERATION
OTW
Figure 6. Overtemperature Warning and Shutdown
Rev. 0 | Page 5 of 16
5 Page 
THEORY OF OPERATION
The ADP3629/ADP3630/ADP3631 family of dual drivers is
optimized for driving two independent enhancement N-channel
MOSFETs or insulated gate bipolar transistors (IGBTs) in high
switching frequency applications.
These applications require high speed, fast rise and fall times, and
short propagation delays. The capacitive nature of MOSFETs and
IGBTs requires high peak current capability, as well.
ADP3629/ADP3630/ADP3631
1 SD
NONINVERTING
OTW 8
VDS
INA,
2 INA
A
OUTA 7
INVERTING
3 PGND
NONINVERTING
INB,
4 INB
B
INVERTING
VDD 6
OUTB 5
VDD
VDS
Figure 21. Typical Application Circuit
INPUT DRIVE REQUIREMENTS (INA, INA, INB, INB,
AND SD)
The inputs of the ADP3629/ADP3630/ADP3631 are designed
to meet the requirements of modern digital power controllers;
the signals are compatible with 3.3 V logic levels. At the same
time, the input structure allows for input voltages as high as VDD.
The signals applied to the inputs (INA, INA, INB, and INB)
should have steep and clean fronts. It is not recommended that
slow changing signals be applied to drive these inputs because
such signals can result in multiple switching output signals
when the thresholds are crossed, causing damage to the power
MOSFET or IGBT.
An internal pull-down resistor is present at the input, which
guarantees that the power device is off in the event that the
input is left floating.
The SD input has a precision comparator with hysteresis and is
therefore suitable for slow changing signals (such as a scaled-
down output voltage); see the Shutdown (SD) Function section
for more information about this comparator.
ADP3629/ADP3630/ADP3631
LOW-SIDE DRIVERS (OUTA, OUTB)
The ADP3629/ADP3630/ADP3631 family of dual drivers is
designed to drive ground referenced N-channel MOSFETs. The
bias is internally connected to the VDD supply and to PGND.
When the ADP3629/ADP3630/ADP3631 are disabled, both
low-side gates are held low. An internal impedance is present
between the OUTA/OUTB pins and GND, even when VDD is
not present; this feature ensures that the power MOSFET is
normally off when bias voltage is not present.
When interfacing the ADP3629/ADP3630/ADP3631 to exter-
nal MOSFETs, the designer should consider ways to create a
robust design that minimizes stresses on both the driver and
the MOSFETs. These stresses include exceeding the short time
duration voltage ratings on the OUTA and OUTB pins, as well
as on the external MOSFET.
Power MOSFETs are usually selected to have low on resistance to
minimize conduction losses, which usually implies a large input
gate capacitance and gate charge.
SHUTDOWN (SD) FUNCTION
The ADP3629/ADP3630/ADP3631 feature an advanced shut-
down function with accurate thresholds and hysteresis.
The SD signal is an active high signal. An internal pull-up is
present on this pin and, therefore, it is necessary to pull down
the pin externally for the drivers to operate normally.
In some power systems, it is sometimes necessary to provide an
additional overvoltage protection (OVP) or overcurrent protection
(OCP) shutdown signal to turn off the power devices (MOSFETs
or IGBTs) in case of failure of the main controller.
An accurate internal reference is used for the SD comparator so
that it can be used to detect OVP or OCP fault conditions.
+
AC
INPUT
DC
OUTPUT
–
OUTA
PGND
SD
VEN
ADP3629/ADP3630/ADP3631
Figure 22. Shutdown Function Used for Redundant OVP
Rev. 0 | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADP3631.PDF ] | |
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