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PDF IR3086 Data sheet ( Hoja de datos )
| Número de pieza | IR3086 | |
| Descripción | PHASE IC WITH OVP / FAULT AND OVERTEMP DETECT | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IR3086 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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IR3086
PRELIMINARY DATA SHEET
XPHASETM PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT
DESCRIPTION
The IR3086 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.
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
DataShee
• OVP comparator with 150ns responDseataSheet4U.com
• Phase Fault Detection
• Programmable Phase Over-Temperature Detection
• Small thermally enhanced 20L MLPQ package
PACKAGE PINOUT
DataSheet4U.com
Page 1 of 15
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1 RMPIN+
2 RMPIN-
3 HOTSET
4 VRHOT
5 ISHARE
IR3086
PHASE
IC
VCCH
GATEH
PGND
GATEL
VCCL
15
14
13
12
11
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IR3086
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
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
DataSheet4U.com 20
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
temperature exceeds the user programmable limit. Connect external pull-up.
DataShee
Output of the CuDrraetnatSSheenest4eUA.mcopmlifier 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 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 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 Amplifier and non-inverting input to the OVP
comparator
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 and inverting input to the OVP
comparator. Current sensing and PWM operation referenced to this pin.
System reference voltage for internal circuitry
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IR3086
IR3086 THEORY OF OPERATION
Block Diagram
The Block diagram of the IR3086 is shown in figure 6 and specific features discussed in the following section.
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
2V
SHARE
ADJUST
ERROR
AMP
10K
+
20mV
-
X
0.91
0% DUTY
CYCLE
COMPARATOR
+Data+Sheet4UCSA.cUEMRNPoRSmEENT
VRHOT
COMPARATOR
X34
+ VOLTAGE
PROPORTIONAL
TO ABSOLUTE
- TEMPERATURE
-
OVP
+
COMPARATOR
+
130mV
-
INTERNAL
CIRCUIT
BIAS
FAULT
COMPARATOR
VCCH
GATEH
VCCL
GATEL
PGND
VCC
DACIN
CSIN+
CSIN-
PHSFLT
DataShee
Figure 6 – IR3086 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 additional 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 IR3086 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 at VCCL and VCCH supply voltages below the normal
operating range. An 80kΩ resistor is connected across the GATEX and PGND pins to prevent the GATEX voltage
from rising due to leakage or other cause under these conditions.
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| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet IR3086.PDF ] | |
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