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IR3088MTR Datasheet(PDF) 14 Page - International Rectifier

Part # IR3088MTR
Description  XPHASE PHASE IC WITH FAULT AND OVERTEMP DETECT
PDF  34 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3088MTR Datasheet(HTML) 14 Page - International Rectifier

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IR3088
DESIGN PROCEDURES - IR3081 AND IR3088 CHIPSET
IR3081 EXTERNAL COMPONENTS
Oscillator Resistor Rosc
The oscillator of IR3081 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 ROSC according to
the curve in Figure 13 of IR3081 Data Sheet.
Soft Start Capacitor CSS/DEL and Resistor RSS/DEL
Because the capacitor CSS/DEL programs four different time parameters, i.e. soft start delay time, soft start time,
over-current latch delay time, and power good delay time, they should be considered together while choosing
CSS/DEL.
The SS/DEL pin voltage controls the slew rate of the converter output voltage, as shown in Figure 10 of IR3081
Data Sheet. After the ENABLE pin voltage rises above 0.6V, there is a soft-start delay time
tSSDEL, after which the
error amplifier output is released to allow the soft start. The soft start time
tSS represents the time during which
converter voltage rises from zero to VO. tSS can be programmed by an external capacitor, which is determined by
Equation (1).
O
SS
O
SS
CHG
DEL
SS
V
t
V
t
I
C
*
10
*
70
*
6
/
−
=
=
(1)
Once CSS/DEL is chosen, the soft start delay time
tSSDEL, the over-current fault latch delay time tOCDEL, and the
delay time
tVccPG from output voltage (VO) in regulation to Power Good are fixed and shown in Equations (2), (3)
and (4) respectively.
6
/
/
10
*
70
3
.
1
*
3
.
1
*
−
=
=
DEL
SS
CHG
DEL
SS
SSDEL
C
I
C
t
(2)
6
/
/
10
*
6
09
.
0
*
09
.
0
*
−
=
=
DEL
SS
DISCHG
DEL
SS
OCDEL
C
I
C
t
(3)
6
/
/
10
*
70
)
3
.
1
91
.
3
(
*
)
3
.
1
91
.
3
(
*
−
−
−
=
−
−
=
O
DEL
SS
CHG
O
DEL
SS
VccPG
V
C
I
V
C
t
(4)
If faster over-current protection is required, a resistor in series with the soft start capacitor CSS/DEL can be used to
reduce the over-current fault latch delay time tOCDEL, and the resistor RSS/DEL is determined by Equation (5).
Equation (1) for soft start capacitor CSS/DEL and Equation (4) for power good delay time tVccPG are unchanged,
while the equation for soft start delay time tSS/DEL (Equation 2) is changed to Equation (6). Considering the worst
case values of charge and discharge current, RSS/DEL should be no grater than 10kΩ.
6
/
6
/
/
10
*
6
10
*
6
09
.
0
*
09
.
0
−
−
∗
−
=
−
=
DEL
SS
OCDEL
DISCHG
DEL
SS
DISCHG
OCDEL
DEL
SS
C
t
I
C
I
t
R
(5)
6
6
/
/
/
/
10
*
70
)
10
*
70
*
3
.
1
(
*
)
3
.
1
(
*
−
−
−
=
∗
−
=
DEL
SS
DEL
SS
CHG
CHG
DEL
SS
DEL
SS
SSDEL
R
C
I
I
R
C
t
(6)
VDAC Slew Rate Programming Capacitor CVDAC and Resistor RVDAC
The slew rate of VDAC down-slope SRDOWN can be programmed by the external capacitor CVDAC as defined in
Equation (7), where ISINK is the sink current of VDAC pin as shown in Figure 15 of IR3081 Data Sheet. The resistor
RVDAC is used to compensate VDAC circuit and is determined by Equation (8). The slew rate of VDAC up-slope
Page 14 of
34
9/30/04



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