IR3086AMPBF International Rectifier, IR3086AMPBF Datasheet - Page 21

• Manufacturer Part Number: IR3086AMPBF
• Description: IC PHASE CONTROLLER OVP 20MLPQ
• Manufacturer: International Rectifier
• Series: XPhase™r

Specifications of IR3086AMPBF

• Applications: Processor
• Current - Supply: 10mA
• Voltage - Supply: 8.4 V ~ 14 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-MLPQ
• Ic Function: Phase IC With Fault And OverTemp Detect
• Supply Voltage Range: 8.4V To 14V, 6V To 25V, 6V To 14V
• Operating Temperature Range: -40°C To +150°C
• Digital Ic Case Style: MLPQ
• No. Of Pins: 20
• Rohs Compliant: Yes
• Package: 20-Lead MLPQ
• Circuit: X-Phase Phase IC
• Iout (a): 2.5A Gate Driver
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *IR3086AMPBF

DESIGN EXAMPLE 1 - VRM 10 2U CONVERTER
SPECIFICATIONS
Input Voltage: V
DAC Voltage: V
No Load Output Voltage Offset: V
Output Current: I
Maximum Output Current: I
Output Impedance: R
VCC Ready to VCC Power Good Delay: t
Soft Start Time: t
Over Current Delay: t
Dynamic VID Down-Slope Slew Rate: SR
Over Temperature Threshold: T
POWER STAGE
Phase Number: n=6
Switching Frequency: f
Output Inductors: L=220 nH, R
Output Capacitors: AL-Polymer, C=560uF, R
IR3081A EXTERNAL COMPONENTS
Oscillator Resistor Rosc
Once the switching frequency is chosen, R
Sheet. For switching frequency of 400kHz per phase, choose R
Soft Start Capacitor C
Determine the soft start capacitor from the required soft start time.
The soft start delay time is
The power good delay time is
Over current delay time is
C
t
t
t
VccPG
SSDEL
OCDEL
SS
/
DEL
=
=
=
C
Page 21 of 33
C
=
C
SS
SS
SS
I
I
/
CHG
/
I
OCDISCHG
DEL
/
DEL
CHG
DEL
V
O
∗
DAC
( *
I
∗
=12 V
*
O
SS
t
1
SS
. 3
. 0
I
=105 ADC
3 .
CHG
=2 mS
=1.35 V
735
115
=
=
OCDEL
O
70
=0.91 m
SW
. 0
−
SS/DEL
=
. 1
* 1
V
70
*
35
=400 kHz
. 0
O
10
10
OMAX
* 1
*
< 0.5mS
−
−
−
10
−
. 1
40
6
20
10
6
L
) 3
∗
−
∗
=0.47 m
*
PCB
6
−
*
2
1
=120 ADC
6
10
10
=
3 .
O_NLOFST
*
*
10
−
. 0
. 0
=115 ºC
−
=
6
3
* 1
115
−
. 1
3
86
10
=
VccPG
=
DOWN
mS
0
−
6
1 .
. 0
=20 mV
( *
OSC
uF
70
29
C
. 3
= 7m , Number Cn=10
=0-10mS
ms
=2.5mV/uS
*
735
10
can be determined from the curve in Figure 13 of IR3081A Data
−
−
6
. 1
33
−
1
) 3 .
=
OSC
. 1
58
=30.1k
ms
IR3086APbF
May 13, 2009