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PDF IR3088A Data sheet ( Hoja de datos )
| Número de pieza | IR3088A | |
| Descripción | XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT | |
| Fabricantes | International Rectifier | |
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Data Sheet No. PD94704
IR3088A
XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT
DESCRIPTION
The IR3088A 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 IR3088A is intended for the following application conditions;
• Excessive impedance between converter and load
• Output voltage exceeding the control IC reference/VID voltage is desired
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
DataShee
• Current Share Amplifier reduces PWDMataRSahmepets4loUp.ceotmo ensure sharing between phases
• Body BrakingTM disables Synchronous MOSFET for improved transient response and prevents negative
output voltage at converter turn-off
• Phase Fault Detection
• Programmable Phase Over-Temperature Detection
• Control FET driver’s 25V input voltage capability simplifies boot-strap supply design
• Small thermally enhanced 20L MLPQ package
PACKAGE PINOUT
1 RMPIN+
2 RMPIN-
3 HOTSET
4 VRHOT
5 ISHARE
IR3088A
PHASE
IC
VCCH
GATEH
PGND
GATEL
VCCL
15
14
13
12
11
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PARAMETER
General
VCC Supply Current
VCCL Supply Current
VCCH Supply Current
BIASIN Bias Current
DACIN Bias Current
TEST CONDITION
6V ≤ VCCH ≤ 14V
14V ≤ VCCH ≤ 25V
Note 1: Guaranteed by design, but not tested in production
IR3088A
MIN TYP MAX UNIT
10 14 mA
2.5 5 mA
5.5 8 mA
6.5 10 mA
-5 -2.5 2
µA
-2 -0.5 1
µA
PIN DESCRIPTION
et4U.com
PIN#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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PIN SYMBOL
RMPIN+
RMPIN-
HOTSET
VRHOT
ISHARE
SCOMP
EAIN
PWMRMP
LGND
VCC
VCCL
GATEL
PGND
GATEH
VCCH
CSIN+
CSIN-
PHSFLT
DACIN
BIASIN
PIN DESCRIPTION
Non-inverting input to Ramp Comparator
Inverting input to Ramp Comparator
Inverting input to VRHOT comparator. Connect resistor divider from VBIAS to LGND
to program VRHOT threshold. Diode or thermistor may be substituted for lower
resistor for enhanced/remote temperature sensing.
Open Collector output of the VRHOT comparator which drives low if IC junction
DataShee
temperature excDeeadtasSthheeeuts4eUr.cporomgrammable limit. Connect external pull-up.
Output of the Current Sense Amplifier and input to the Share Adjust Error Amplifier.
Voltage on this pin is equal to V(DACIN) + 34 * [V(CSIN+) – V(CSIN-)]. Connecting
ISHARE pins together creates a Share Bus enabling current sharing between Phase
ICs. The Share bus is also used by the Control IC for voltage positioning and Over-
Current protection.
Compensation for the Current Share control loop. Connect a capacitor to ground to
set the control loop’s bandwidth.
PWM comparator input from the error amplifier output of Control IC. Both Gate
Driver outputs drive low if the voltage on this pin is less than 91% of V(DACIN).
PWM comparator ramp input. Connect a resistor from this pin to the converter input
voltage and a capacitor to LGND to program the PWM ramp.
Signal ground and IC substrate connection
Power for internal circuitry
Power for Low-Side Gate Driver
Low-Side Gate Driver Output and input to GATEH non-overlap comparator
Return for Gate Drivers
High-Side Gate Driver Output and input to GATEL non-overlap comparator
Power for High-Side Gate Driver
Non-inverting input to the Current Sense Amplifier
Inverting input to the Current Sense
Open Collector output of the Phase Fault comparator. Drives low if Phase current is
unable to match the level of the SHARE bus due to an external fault. Connect
external pull-up.
Reference voltage input from the Control IC. Current sensing and PWM operation
referenced to this pin.
System reference voltage for internal circuitry
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IR3088A
IR3088A THEORY OF OPERATION
Block Diagram
The Block diagram of the IR3088A is shown in figure 6, and specific features are discussed in the following sections.
et4U.com
RMPIN+
RMPIN-
EAIN
BIASIN
PWMRMP
SCOMP
ISHARE
LGND
VRHOT
HOTSET
RAMP
COMPARATOR
CLOCK
PULSE
GENERATOR
PWM
COMPARATOR
-
SYSTEM
REFERENCE
VOLTAGE
+
ENABLE
PWM
LATCH
S
RESET
DOMINANT
R
RAMP
SLOPE
ADJUST
RAMP
DISCHARGE
CLAMP
-
GATE
+
NON-OVERLAP
COMPARATORS
SHARE
ADJUST
ERROR
AMP
+
X
0.91
0% DUTY
CYCLE
COMPARATOR
10K 20mV
-
VRHOT
COMPARATOR
+
+
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+ VOLTAGE
PROPORTIONAL
TO ABSOLUTE
- TEMPERATURE
FAULT
COMPARATOR
2V
INTERNAL
CIRCUIT
BIAS
CURRENT
SENSE
AMP
X34
VCCH
GATEH
VCCL
GATEL
PGND
VCC
DACIN
CSIN+
CSIN-
PHSFLT
DataShee
Figure 6. IR3088A Block Diagram
Tri-State Gate Drivers
The gate drivers can deliver up to 3A peak current. An adaptive non-overlap circuit monitors the voltage on the
GATEH and GATEL pins to prevent MOSFET shoot-through current while minimizing body diode conduction.
An Enable signal is provided by the Control IC to the Phase IC without the addition of a dedicated signal line. The
Error Amplifier output of the Control IC drives low in response to any fault condition such as input under voltage or
output overload. The IR3088A 0% duty cycle comparator detects this and drives both gate outputs low. This tri-state
operation prevents negative inductor current and negative output voltage during power-down.
The Gate Drivers revert to a high impedance “off” state if VCCL and VCCH supply voltages are below the normal
operating range. An 80kΩ resistor is connected across the GATEH/GATEL and PGND pins to prevent the
GATEH/GATEL voltage from rising due to leakage or other cause under these conditions.
Thermal Monitoring (VRHOT)
The IR3088A senses its own die temperature and produces a voltage at the input of the VRHOT comparator that is
proportional to temperature. An external resistor divider connected from VBIAS to the HOTSET pin and ground can
be used to program the thermal trip point of the VRHOT comparator. The VRHOT pin is an open-collector output and
should be pulled up to a voltage source through a resistor. If the thermal trip point is reached the VRHOT output
DataSheet4Udr.icvoems low.
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet IR3088A.PDF ] | |
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