IR3086AMPBF International Rectifier, IR3086AMPBF Datasheet - Page 25

• 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 2 - EVRD 10 HIGH FREQUENCY ALL-CERAMIC 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=100 nH, R
Output Capacitors: Ceramic, C=22uF, R
IR3081A EXTERNAL COMPONENTS
Oscillator Resistor Rosc
Once the switching frequency is chosen, R
Sheet. For switching frequency of 800kHz 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
VDAC Slew Rate Programming Capacitor C
From Figure 15 of IR3081A Data Sheet, the sink current of VDAC pin corresponding to 800kHz (R
170uA. Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew rate.
C
t
t
t
VccPG
SSDEL
OCDEL
SS
/
DEL
=
=
=
C
Page 25 of 33
C
=
C
SS
SS
SS
I
CHG
I
/
/
I
OCDISCHG
DEL
/
DEL
CHG
DEL
V
O
∗
DAC
( *
I
∗
=12 V
t
*
O
SS
SS
1
. 3
. 0
=105 ADC
I
3 .
CHG
=2.9mS
735
=1.3 V
115
=
=
OCDEL
O
70
=0.91 m
SW
. 0
−
SS/DEL
1
=
*
15
3 .
V
10
70
. 0
=800 kHz
O
−
*
OMAX
15
−
−
10
*
< 0.5mS
20
6
1
10
*
40
∗
) 3 .
−
L
*
10
6
3
−
=0.5 m
PCB
10
*
=120 ADC
∗
6
*
−
=
10
O_NLOFST
1
10
6
−
3 .
3
. 0
*
=115 ºC
−
−
6
. 0
3
15
=
115
=
2
*
C
8 .
. 0
10
VccPG
DOWN
= 2m , Number Cn=62
mS
16
=
−
=20 mV
6
. 0
OSC
uF
( *
70
43
VDAC
=0-10mS
. 3
=2.5mV/uS
, choose C
*
ms
735
10
can be determined from the curve in Figure 13 of IR3081A Data
−
and Resistor R
6
−
. 1
33
SS/DEL
−
1
) 3 .
OSC
=
=0.15uF
2
4 .
=13.3k
VDAC
ms
IR3086APbF
May 13, 2009
OSC
=13.3k ) is