IR3513ZMTRPBF International Rectifier, IR3513ZMTRPBF Datasheet - Page 29

• Manufacturer Part Number: IR3513ZMTRPBF
• Description: IC CTRL XPHASE3 POL 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3513ZMTRPBF

• Applications: Processor
• Current - Supply: 3mA
• Voltage - Supply: 8 V ~ 16 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: *
• Package: 32-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 250kHz to 1.5MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Bootstrap Capacitor C
Depending on the duty cycle and gate drive current of the phase IC, a capacitor in the range of 0.1uF to 1uF 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.
Over-voltage Resistors R
The over-voltage resistors are used to set the voltage at the OVSNS pin. If the voltage of the OVSNS pin exceeds
VREF by 85mV then the over-voltage protection will be activated and the error amplifier voltage will be pulled
down turning the converter off. The over-voltage fault is latched, which means that the power to the converter has
to be recycled for the fault to clear. Choose VOVSNS a certain value ∆V below VREF. VREF is typically 0.8 V.
The over-voltage threshold will then be ∆V+85mV. Select R
VREF Slew Rate Programming Capacitor C
The slew rate of MARGIN down-slope can be programmed by the external capacitor C
where I
slope. The resistor R
Type III Compensation
Choose the crossover frequency fc between 1/10 and 1/5 of the switching frequency per phase, the desired
phase margin θc and Rfb1 (see Figure 17). Determine the component values based on the equations below. wc is
2*π*fc (the crossover angular frequency), Le is the equivalent inductance of the converter, C is the output
capacitance, Rst is the total equivalent resistance in series with the inductor, Rc is the output capacitance ESR
and R is the load resistance.
SINK
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is the sink current of the VREF pin. The slew rate of MARGIN up-slope is the same as that of down-
Ccp
Rcp
Ccp
Cfb
VREF
1
=
=
BST
=
=
C
R
R
Ccp
wz
is used to compensate the VREF circuit and can be calculated as shown in (18).
VREF
OV
VREF
K
OV1
wp
2
⋅
2
1
1
Rfb
2
1
⋅
=
⋅
and R
1
=
=
wz
Rfb
⋅
V
Rcp
VOVSNS
0
1
SR
OUT
1
5 .
1
I
REPLACEMENT PRODUCT – IR3513ZMTRPBF
MARGIN
SINK
OV2
+
NOT RECOMMENDED FOR NEW DESIGNS
−
3
VOVSNS
2 .
C
VREF
∗
*
=
10
R
VREF
132
OV
SR
2
−
15
1
MARGIN
*
and Resistor R
10
−
6
OV1.
R
OV2
VREF
is calculated based on (16).
VREF
(16)
(17)
(18)
(20)
(22)
(19)
(21)
May 11, 2008
as defined in (17),
IR3513