IP1827TRPBF International Rectifier, IP1827TRPBF Datasheet - Page 22
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IP1827TRPBF
Manufacturer Part Number
IP1827TRPBF
Description
IC DC-DC REG SYNC BUCK LGA
Manufacturer
International Rectifier
Series
iPOWIR™r
Type
Step-Down (Buck), PWM - Voltage Moder
Datasheet
1.IP1827TRPBF.pdf
(39 pages)
Specifications of IP1827TRPBF
Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.6 V ~ 12 V
Current - Output
25A
Frequency - Switching
225kHz ~ 1.65MHz
Voltage - Input
1.5 V ~ 16 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
*
Package / Case
*
Package
LGA - 7.7 x 7.7
Circuit
Single Output
Iout (a)
25
Switch Freq (khz)
250 - 1500
Input Range (v)
1.5 - 16
Output Range (v)
0.6 - 0.75*Vin
Internal Bias Ldo
Yes
Ocp Otp Uvlo Pre-bias Soft Start And
Remote Sense + Body Tracking + Temp Comp OCP
Pbf
PbF Option Available
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
IP1827TRPBF
Manufacturer:
TOSH
Quantity:
2 686
The transfer function (V
The (s) indicates that the transfer function varies as a
function of frequency. This configuration introduces a gain
and zero, expressed by:
First select the desired zero‐crossover frequency (F
Use the following equation to calculate R
H(s) dB
V
V
oso
e
R
3
Z
F
F
Figure 18: Type II compensation network
H
H
o
IN
z
22
Gain(dB)
(
V
s
s
in
)
F
F
2
and its asymptotic gain plot
*
o
ESR
F
*
*
F
January 24, 2011 | V1.2
V
Z
R
R
OSO
m
Z
R
F
Z
1
and
3
8
3
ESR
R
IN
R
*
f
e
*
/V
8
9
C
*
oso
F
*
4
V
o
R
Fb
REF
) is given by:
F
1
8
LC
2
sR
1/5
sR
8
R
C
3
E/A
C
3
4
~
4
1/10
3
C
F
:
POLE
POLE
(19)
(20)
*
Highly Integrated 25A Single‐input Voltage,
(21)
C
F
Comp
4
s
(18)
Frequency
o
):
Z
Ve
f
Synchronous Buck Regulator
Where:
To cancel one of the LC filter poles, place the zero before
the LC filter resonant frequency pole:
Use equations (20), (21) and (22) to calculate C
One more capacitor is sometimes added in parallel with C
and R
to suppress the switching noise.
The additional pole is given by:
For a general solution for unconditional stability for any
type of output capacitors, and a wide range of ESR values,
we should implement local feedback with a type III
compensation network. The typically used compensation
network for voltage‐mode controller is shown in Figure 19.
Again, the transfer function is given by:
The pole sets to one half of the switching frequency which
V
F
F
F
R
β = V
F
3
C
o
ESR
LC
m
. This introduces one more pole which is mainly used
8
F
in
= Crossover Frequency
F
F
= Feedback Resistor
=Modulator gain
= Maximum Input Voltage
= Resonant Frequency of the Output Filter
POLE
P
= Zero Frequency of the Output Capacitor
z
z
ref
75
. 0
2
/V
75
%
results in the capacitor C
o
*
*R
*
R
F
2
V
3
3
V
LC
*F
oso
*
e
1
C
1
C
s
L
1
4
4
o
H
*
*
C
C
1
C
(
C
4
s
o
POLE
POLE
)
*R
Z
Z
1
3
IN
*F
f
POLE:
iP1827
s
4
(22)
.
(23)
(24)
97599
4