IR3080MTRPBF International Rectifier, IR3080MTRPBF Datasheet - Page 24

• Manufacturer Part Number: IR3080MTRPBF
• Description: IC CONTROLLER PHASE 32LMLPQ
• Manufacturer: International Rectifier
• Series: XPhase™r

Specifications of IR3080MTRPBF

• Applications: Processor
• Current - Supply: 11mA
• Voltage - Supply: 9.5 V ~ 14 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 32-MLPQ
• Ic Function: Control IC With VCCVID And Overtemp Detect
• Supply Voltage Range: 9.5V To 14V
• Operating Temperature Range: 0°C To +100°C
• Digital Ic Case Style: MLPQ
• No. Of Pins: 32
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Controller Type: PWM
• Package: 32-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 150kHz to 1.0MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: IR3080MPBFTR; IR3080MTRPBF; IR3080MTRPBFTR

Combined Over Temperature and Phase Delay Setting Resistors R
The over temperature setting resistor divider can be combined with the phase delay resistor divider to save one
resistor per phase.
Calculate the HOTSET threshold voltage V
Equation (23). If the over temperature setting voltage is lower than the phase delay setting voltage,
VBIAS*RA
between R
If the over temperature setting voltage is higher than the phase delay setting voltage, VBIAS*RA
HOTSET pin between R
respectively. Pre-select R
Bootstrap Capacitor C
Depending on the duty cycle and gate drive current of the phase IC, a 0.1uF to 1uF capacitor is needed for the
bootstrap circuit.
Decoupling Capacitors for Phase IC
0.1uF-1uF decoupling capacitors are required at VCC and VCCL pins of phase ICs.
VOLTAGE LOOP COMPENSATION
The adaptive voltage positioning (AVP) is usually adopted in the computer applications to improve the transient
response and reduce the power loss at heavy load. Like current mode control, the adaptive voltage positioning loop
introduces extra zero to the voltage loop and splits the double poles of the power stage, which make the voltage
loop compensation much easier.
Resistors R
depends on the output capacitors used in the converter. For the applications using Electrolytic, Polymer or AL-
Polymer capacitors and running at lower frequency, type II compensation shown in Figure 17(a) is usually enough.
While for the applications using only ceramic capacitors and running at higher frequency, type III compensation
shown in Figure 17(b) is preferred.
For applications where AVP is not required, the compensation is the same as for the regular voltage mode control.
For converter using Polymer, AL-Polymer, and ceramic capacitors, which have much higher ESR zero frequency,
type III compensation is required as shown in Figure 17(b) with R
Type II Compensation for AVP Applications
Determine the compensation at no load, the worst case condition. Choose the crossover frequency fc between 1/10
and 1/5 of the switching frequency per phase. Assume the time constant of the resistor and capacitor across the
output inductors matches that of the inductor, and determine R
and C
respectively.
Page 24
E
are the equivalent inductance of output inductors and the equivalent capacitance of output capacitors
PHASEx
PHASEx2
FB
and R
, connect RMPIN+ or RMPIN- pin between R
and R
R
R
R
R
DRP
PHASEx
PHASEx
PHASEx
PHASEx
BST
PHASEx1
PHASEx3
are chosen according to Equations (16) and (17), and the selection of compensation types
PHASEx1
3
3
2
2
=
=
=
=
V
(
RA
(
RA
V
V
BIAS
HOTSET
HOTSET
PHASEx
. Pre-select R
and R
,
PHASEx
V
*
BIAS
1 (
V
−
∗
∗
PHASEx2
BIAS
−
∗
V
RA
−
R
V
RA
V
BIAS
PHASEx
V
BIAS
PHASEx
BIAS
HOTSET
∗
PHASEx
1 (
*
HOTSET
−
−
PHASEx1
−
R
1
V
and connect RMPIN+ or RMPIN- between R
V
PHASEx
RA
)
HOTSET
HOTSET
∗
PHASEx
V
BIAS
1
corresponding to the allowed maximum temperature from
,
* )
)
)
∗
R
R
PHASEx
PHASEx
CP
1
PHASEx1
DRP
1
and C
and C
PHASE1,
CP
and R
DRP
from Equations (30) and (31), where L
R
removed.
PHASEx2,
PHASE2
and R
and connect HOTSET pin
(26)
(27)
(28)
(29)
IR3080PbF
PHASEx2
PHASE3
PHASEx
and R
, connect
PHASEx3
E