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PDF IR3087 Data sheet ( Hoja de datos )

Número de pieza IR3087
Descripción XPHASE PHASE IC
Fabricantes International Rectifier 
Logotipo International Rectifier Logotipo



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IR3087
DATA SHEET
XPHASETM PHASE IC WITH OPTI-PHASETM, OVP, AND OVERTEMP DETECT
DESCRIPTION
The IR3087 Phase IC combined with an IR XPhaseTM Control IC provides a full featured and flexible way to
implement power solutions for the latest high performance CPUs and ASICs. The “Control” IC provides
overall system control and interfaces with any number of “Phase” ICs which each drive and monitor a single
phase of a multiphase converter. The XPhaseTM architecture results in a power supply that is smaller, less
expensive, and easier to design while providing higher efficiency than conventional approaches.
The IR3087 with Opti-PhaseTM is intended for applications demanding increased efficiency under medium to
light load conditions. Both gate drivers will drive low at a programmable output current threshold. This
effectively disconnects the phase from the load eliminating power losses due to switching and circulating
currents.
FEATURES
2.5A Average Gate Drive Current
Loss-Less Inductor Current Sense
Internal Inductor DCR Temperature Compensation
Programmable Phase Delay
Programmable Feed-Forward Voltage Mode PWM Ramp
Sub 100ns Minimum Pulse Width supports 1MHz per-phase operation
Current Sense Amplifier drives a single wire Average Current Share Bus
Current Share Amplifier reduces PWM Ramp slope to ensure sharing between phases
Body BrakingTM disables Synchronous MOSFET for improved transient response and prevents negative
output voltage at converter turn-off
Opti-PhaseTM reduces the number of phases for improved light to medium load efficiency
OVP comparator with 150ns response
Programmable Phase Over-Temperature Detection
Small thermally enhanced 20L MLPQ package
APPLICATION CIRCUIT
VGATE
12V
VRHOT
DAC
BIAS
5 Wire Analog Bus
From Control IC
RAMP
ISHARE
ROP1
ROP2
RBIASIN 20k
RCS-
CCS-
CCS+
RCS+
DBST
CBST
1 RMPIN+
2 RMPIN-
3 HOTSET
4 VRHOT
5 ISHARE
IR3087
PHASE
IC
VCCH
GATEH
PGND
GATEL
VCCL
15
14
13
12
11
L
CO
CIN
VO
CVCCL
RVCC
EA RPWMRMP
CSCOMP
CVCC
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IR3087 pdf
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PARAMETER
OVP Comparator
Threshold Voltage
Propagation Delay
General
VCC Supply Current
VCCL Supply Current
VCCH Supply Current
BIASIN Bias Current
DACIN Bias Current
VRHOT Comparator
HOTSET Bias Current
Output Voltage
VRHOT Leakage Current
Threshold Hysteresis
Threshold Voltage
TEST CONDITION
Compare to V(DACIN)
VCCL = 12V. Measure time from CSIN
> V(DACIN) (200mV overdrive) to
GATEL transition to <11V.
MIN
100
4V VCCH 14V
14V VCCH 28V
-5
-2
I(VRHOT) = 29mA
V(VRHOT) = 5.5V
TJ 85 oC
TJ 85 oC
MIN
4.73mV/ oC x TJ
+ 1.36V
-6
3.0
TYP
4.73mV/ oC x
TJ + 1.46V
Note 1: Guaranteed by design, but not tested in production
IR3087
TYP MAX UNIT
125 160 mV
150 250
ns
10 14
2.5 5
5.5 8
6.5 10
-2.5 2
-1 1
-4 -2
300 400
0 10
7.0 11.0
MAX
4.73mV/ oC x
TJ + 1.56V
mA
mA
mA
mA
µA
µA
µA
mV
µA
oC
V
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IR3087 arduino
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IR3087
vL
iL L
RL
RCS
Current
Sense Amp
CSOUT
CCS
vCcS
VO
CO
Figure 5. Inductor Current Sensing and Current Sense Amplifier
The advantage of sensing the inductor current versus high side or low side sensing is that actual output current
being delivered to the load is obtained rather than peak or sampled information about the switch currents. The
output voltage can be positioned to meet a load line based on real time information. Except for a sense resistor in
series with inductor, this is the only sense method that can support a single cycle transient response. Other
methods provide no information during either load increase (low side sensing) or load decrease (high side sensing).
An additional problem associated with peak or valley current mode control for voltage positioning is that they suffer
from peak-to-average errors. These errors will show in many ways but one example is the effect of frequency
variation. If the frequency of a particular unit is 10% low, the peak to peak inductor current will be 10% larger and
the output impedance of the converter will drop by about 10%. Variations in inductance, current sense amplifier
bandwidth, PWM prop delay, any added slope compensation, input voltage, and output voltage are all additional
sources of peak-to-average errors.
Current Sense Amplifier
This is a high speed differential current sense amplifier, as shown in Figure 5. Its gain decreases with increasing
temperature and is nominally 34 at 25ºC and 29 at 125ºC (-1470 ppm/ºC). This reduction of gain tends to
compensate the 3850 ppm/ºC increase in inductor DCR. Since in most designs the Phase IC junction is hotter than
the inductor these two effects tend to cancel such that no additional temperature compensation of the load line is
required.
The current sense amplifier can accept positive differential input up to 100mV and negative up to -20mV before
clipping. The output of the current sense amplifier is summed with the DAC voltage and sent to the Control IC and
other Phases through an on-chip 10Kresistor connected to the ISHARE pin. The ISHARE pins of all the phases
are tied together and the voltage on the share bus represents the average current being delivered to the load and is
used by the Control IC for voltage positioning and current limit protection.
Average Current Share Loop
Current sharing between phases of the converter is achieved by the average current share loop in each Phase IC.
The output of the current sense amplifier is compared with the share bus less a 20mV offset. If current in a phase is
smaller than the average current, the share adjust error amplifier of the phase will activate a current source that
reduces the slope of its PWM ramp thereby increasing its duty cycle and output current. The crossover frequency of
the current share loop can be programmed with a capacitor at the SCOMP pin so that the share loop does not
interact with the output voltage loop.
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