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IR3841MPbF
F Z 2 = F o
= 17.63 kHz
F P 2 = F o
= 567.1 kHz
R OCSet ? I OCSet
Detailed calculation of compensation TypeIII
Desired Phase Margin Θ = 70 o
1 ? sin Θ
1 + sin Θ
1 + sin Θ
1 ? sin Θ
Select : F Z 1 = 0 . 5 * F Z 2 = 8.82 kHz and
F P 3 = 0.5 * F s = 300 kHz
Select : C 7 = 2.2 nF
Calculate R 3 , C 3 and C 4 :
Programming the Current-Limit
The Current-Limit threshold can be set by
connecting a resistor (R OCSET ) from the SW pin
to the OCSet pin. The resistor can be calculated
by using equation (4). This resistor ROCSET
must be placed close to the IC.
The R DS(on) has a positive temperature
coefficient and it should be considered for the
worst case operation.
)
I SET = I L ( critical = .......... .......... (32)
R DS ( on )
R DS ( on ) = 8.7 m ? * 1.5 = 13.05 m ?
I SET ? I o ( LIM ) = 8 A * 1.5 = 12 A
(50% over nominal output current )
I OCSet = 59.07 μ A (at F s = 600 kHz)
R OCSet = 2.65 k ? Select R 7 = 2.67 k ?
Setting the Power Good Threshold
R 3 =
2 π * F o * L o * C o * V osc
C 7 * V in
; R 3 = 3.05 k Ω
Power Good threshold is internally set at 88% of
Vref. When the voltage at the FB pin exceeds the
threshold, PGood is asserted.
Select : R 3 = 3.01 k Ω
The PGood is an open drain output. Hence, it is
C 4 =
1
2 π * F Z 1 * R 3
; C 4 = 6 nF, Select : C 4 = 10 nF
necessary to use a pull up resistor R PG from
PGood pin to Vcc. The value of the pull-up
resistor must be chosen such as to limit the
current flowing into the PGood pin, when the
output voltage is not in regulation, to less than 5
C 3 =
1
2 π * F P 3 * R 3
; C 3 = 176.25 pF , Select : C 3 = 150 pF
mA. A typical value used is 4.7k ? .
Calculate R 10 , R 8 and R 9 :
R 10 =
R 8 =
1
2 π * C 7 * F P 2
1
2 π * C 7 * F Z 2
; R 10 = 128 Ω , Select : R 10 = 130 Ω
- R 10 ; R 8 = 3.97 k Ω ,
Select : R 8 = 4.02 k Ω
R 9 =
V ref
V o - V ref
* R 8 ; R 9 = 2.56 k Ω Select : R 9 = 2.55 k Ω
06/18/09
22
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