IR3084AMPBF International Rectifier, IR3084AMPBF Datasheet - Page 22

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IR3084AMPBF

Manufacturer Part Number
IR3084AMPBF
Description
IC XPHASE CONTROL 28-MLPQ
Manufacturer
International Rectifier
Series
XPhase™r
Datasheet

Specifications of IR3084AMPBF

Applications
Processor
Current - Supply
14mA
Voltage - Supply
9.5 V ~ 16 V
Operating Temperature
0°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
28-MLPQ
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
System Reference Voltage (VBIAS)
The IR3084A supplies a 6.9V/6mA precision reference voltage from the VBIAS pin. The oscillator ramp trip points
are based on the VBIAS voltage so it should be used to program the Phase ICs phase delay to minimize phase
errors.
Phase IC Gate Driver Bias Regulator / VRHOT Comparator
An internal amplifier can be configured as a gate driver bias regulator to provide programmable gate driver
voltage for phase ICs (Figure 12a), or a thermal monitor to provide VRHOT/VRFAN signal as required in VR11
(Figure 12b).
The internal current source IREGSET whose value is programmed by the switching frequency going through the
external RSET resistor sets the gate driver voltage or the VRHOT/VRFAN threshold voltage. An NTC thermistor
is used to monitor the temperature on the VRM/VRD.
Page 22 of 45
R2
100K
CVGDRV
10nF
Figure 12a – IR3084A Bias Regulator configured for Gate Driver Bias Regulator
R1
10K
R3
3K
RH2
36K
Figure 12b – IR3084A Bias Regulator configured for VRHOT# Function
C1
1nF
RVGDRV
97.6K
REGSET
REGFB
IR3084 CONTROL IC
VBIAS
REGSET
IR3084 CONTROL IC
VCC
RH1
1.1MEG
IREGSET
+
-
VCC
IREGSET
REGDRV
+
-
REGDRV
REGFB
R4
2K
R5
1K
C2
10nF
+12V
+
RPU
1ohm / 1206
Q1
CJD200
C3
10uF
+3.3V
RPU1
2K
VGDRIVE
Q5
2N7002
VRHOT#
IR3084A
3/3/2009

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