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PDF IR3622AMPBF Data sheet ( Hoja de datos )
| Número de pieza | IR3622AMPBF | |
| Descripción | SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER | |
| Fabricantes | International Rectifier | |
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Data Sheet No PD94723 revA
IR3622AMPbF
HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP
DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING
Features
Description
• Dual Synchronous Controller with 180o
Out of Phase Operation
• Configurable to 2-Independent Outputs or Current
Shared Single Output
• Output Voltage Tracking
• Power up / down Sequencing
The IR3622A IC integrates a dual synchronous
Buck controller, providing a high performance and
flexible solution. The IR3622A can be configured
as 2-independent outputs or as current shared
single output. The current share configuration is
ideal for high current applications.
• Current Sharing Using Inductor’s DCR
The IR3622A enables output tracking and
• +/-1% Accurate Reference Voltage
sequencing of multiple rails in either ratiometric or
• Programmable Switching Frequency up 600kHz
simultaneous fashion. The IR3622A features 180o
• Programmable Over Current Protection
out of phase operation which reduces the
•
•
Hiccup Current Limit Using MOSFET Rds(on) sensing
Latched Overvoltage Protection
required input/output capacitance and
lower number of capacitors. The
results in
switching
• Dual Programmable Soft-Starts
• Programmable Enable Input
• Pre-Bias Start-up
• Dual Power Good Outputs
• On Board Regulator
frequency is programmable from 200kHz to
600kHz per phase using one external resistor. In
addition, IR3622A also allows the switching
frequency to be synchronized to an external clock
signal.
• External Frequency Synchronization
Other key features offered by this device include
• Thermal Protection
• 32-Lead MLPQ Package
two independent programmable soft starts, two
independent power good outputs, precision
enable input, and under voltage lockout function.
Applications
• Embedded Telecom Systems
• Distributed Point of Load Power Architectures
• Computing Peripheral Voltage Regulator
• Graphics Card
• General DC/DC Converters
The current limit is provided by sensing the lower
MOSFET's on-resistance for optimum cost and
performance. The output voltages are monitored
through dedicated pins to protect against open
circuit, and enhance faster response to an
overvoltage event.
Vin
Vo1 Vo1
Vout1
IR3622A
Rt HDrv1
Comp1
OCSet1
LDrv1
Comp2
PGnd1
SS1 / SD
SS2 / SD
Track
HDrv2
OCSet2
LDrv2
Gnd PGnd2
Vin
Vo2 Vo2
Vout1
Ratiometric Powerup
Ratiometric Powerdown
Vout2
Vo1 Vo1
Vo2 Vo2
Simultaneous Powerup Simultaneous Powerdown
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ORDERING INFORMATION
PKG PACKAGE
DESIG DESCRIPTION
M IR3622AMPbF
M IR3622AMTRPbF
PIN
COUNT
32
32
PARTS
PER TUBE
73
--------
PARTS
PER REEL
-------
3000
T&R
ORIANTAION
Fig A
03/21/07
1 page  
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IR3622AMPbF
Note1: Guaranteed by design but not test in production
Note2: Cold temperature performance is guaranteed via correlation using statistical quality
control. Not tested in production
9V
High Side Driver
(HDrv)
2V
Tr
Tf
9V
Low Side Driver
(LDrv)
2V
Deadband
H_to_L
Tr
Tf
Deadband
L_to_H
Fig. 1: Rise / Fall and deadband time for driver section
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IR3622AMPbF
Internal Regulator
The IR3622A features an on-board 7.2V
regulator with short circuit protection. The
regulator is capable of sourcing current up to
100mA. This integrated regulator can be used to
generate the necessary bias voltage for drivers,
an example of how this can be used is shown in
figure 23, page26.
Out-of-Phase Operation
The IR3622A drives its two output stages 180o
out-of-phase. In current share mode single
output, the two inductor ripple currents cancel
each other and result in a reduction of the output
current ripple and yield a smaller output capacitor
for the same voltage ripple requirement. Figure 4
shows two channels inductor current and the
resulting voltage ripple at the output.
HDRV1
0
HDRV2
DT T
IL1 IL2
Ic
Io
Fig. 4: Current ripple cancellation for output
In addition, the 180o out of phase contributes to
input current cancellation. This results in much
smaller input capacitor’s RMS current and
reduces the number of required input capacitors.
Figure 5 shows the equivalent RMS current.
Single Phase
2 Phase
Duty Cycle (Vo/Vin)
Fig. 5: Input RMS value vs. Duty Cycle
Mode Selection
The IR3622A can operate as a dual output
independently regulated buck converter, or as a
2 phase single output buck converter (current
share mode). The SS2 pin is used for mode
selection. In current share mode this pin should
be floating. In the dual output mode, a soft start
capacitor must be connected from this pin to the
ground to program the start time for the second
output.
Independent Mode
In this mode the IR3622A provides control to two
independent output power supplies with either
common or different input voltages. The output
voltage of each individual channel is set and
controlled by the output of the error amplifier,
which is the amplified error signal from the
sensed output voltage and the reference voltage.
The error amplifier output voltage is compared to
the ramp signal thus generating fixed frequency
pulses of variable duty-cycle, (PWM) which are
applied to the internal MOSEFT drivers. Figure
24 shows a typical schematic for such
application.
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| PDF Descargar | [ Datasheet IR3622AMPBF.PDF ] | |
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