IR3080MTRPBF International Rectifier, IR3080MTRPBF Datasheet - Page 20

• 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

DESIGN PROCEDURES - IR3080 AND IR3086A CHIPSET
IR3080 EXTERNAL COMPONENTS
Oscillator Resistor Rosc
The oscillator of IR3080 generates a triangle waveform to synchronize the phase ICs, and the switching frequency
of the each phase converter equals the oscillator frequency, which is set by the external resistor R
the curve in Figure 13.
VID Delay Capacitor C
After the VID voltage of the integrated linear regulator is above 1.1V, there is a time delay before the soft start of the
converter is initiated. The VID delay time t
and LGND, and the capacitance is determined by (1).
Soft Start Capacitor C
Because the capacitor C
over-current latch delay time, and power good delay time, they should be considered together while choosing
C
The SS/DEL pin voltage controls the slew rate of the converter output voltage, as shown in Figure 11. After the
VIDDEL pin voltage rises above 3.91V, there is a soft-start delay time
is released to allow the soft start. The soft start time
from zero to V
Once C
delay time
and (5) respectively.
If faster over-current protection is required, a resistor in series with the soft start capacitor C
reduce the over-current fault latch delay time t
Equation (2) for soft start capacitor C
while the equation for soft start delay time t
case values of charge and discharge current, R
SS/DEL
Page 20
SS/DEL
.
t
VccPG
R
O.
SS
is chosen, the soft start delay time
t
/
SS
DEL
from output voltage (V
can be programmed by an external capacitor, which is determined by Equation (2).
C
C
t
t
t
VccPG
SSDEL
OCDEL
=
VIDDEL
SS
. 0
SS/DEL
VIDDEL
/
DEL
09
SS/DEL
=
=
=
−
=
C
C
=
C
t
SS
SS
OCDEL
66
I
and Resistor R
I
SS
DISCHG
CHG
/
/
I
I
DEL
*
DEL
programs four different time parameters, i.e. soft start delay time, soft start time,
CHG
/
C
DISCHG
DEL
10
V
SS
. 3
O
*
*
( *
−
1 *
91
/
6
I
DEL
t
*
I
. 3
DISCHG
SS
∗
3 .
CHG
. 0
SS/DEL
t
91
VID
09
=
=
O
−
) in regulation to Power Good are fixed and shown in Equations (3), (4)
70
C
=
VID
V
SS
SS/DEL
70
O
−
C
*
and Equation (5) for power good delay time t
/
SS/DEL
−
10
. 0
SS
DEL
*
can be programmed by an external capacitor between VIDDEL pin
SS/DEL
V
1
10
09
6
/
−
) 3 .
O
OCDEL
DEL
*
6
1 *
−
10
−
*
6
(Equation 3) is changed to Equation (7). Considering the worst
t
=
t
SSDEL,
3 .
t
*
−
OCDEL
6
SS
6
C
should not be greater than 10 kΩ.
t
. 0
*
SS
, and the resistor R
SS
C
10
09
/
SS
−
represents the time during which converter voltage rises
DEL
∗
6
/
the over-current fault latch delay time
6
DEL
*
( *
70
10
. 3
*
−
10
91
6
−
−
6
V
O
t
SSDEL,
−
. 1
) 3
SS/DEL
after which the error amplifier output
is determined by Equation (6).
IR3080PbF
(1)
(2)
(3)
(4)
(5)
VccPG
SS/DEL
(6)
OSC
t
are unchanged,
OCDEL
can be used to
according to
, and the