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IR3477 Datasheet(PDF) 4 Page - International Rectifier

Part # IR3477
Description  15A Highly Integrated SupIRBuck Constant On.Time Control
PDF  21 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3477 Datasheet(HTML) 4 Page - International Rectifier

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March 27, 2013  |   V2.5  |  PD97604
4
IR3477 
15A Highly Integrated SupIRBuck
TM 
TYPICAL APPLICATION 
 
VOUT
TP7
TP10
EN
VCC
TP23
+Vsws
TP24
+Vsws
+Vins
R12
open
C26
open
TP8
VOUTS
5
2
TP21
-Vsws
TP25
-Vin1s
C27
open
TP12
VSWS
5
2
TP22
+Vsws
VIN
C7
open
C8
open
C9
330uF
C10
47uF
C11
open
C1
1uF
R7
1.33K
R8
1.21K
C12
0.1uF
PGOOD
C24
open
ISET
+3.3V
TP6
PGNDS
TP14
+3.3V
U1
IR3477
FCCM
1
SS
6
PGOOD
3
GND1
4
FB
5
NC1
7
ISET
2
PHASE
12
C4
1uF
VCC
TP4
EN
SW1
EN / FCCM
TP17
PGND
C20
0.1uF
TP26
AGND
C5
open
VSW
C21
1uF
TP11
PGOOD
L1
1.0uH
R6
open
C22
open
TP1
VINS
R4
7.50K
R3
200K
C13
open
C2
22uF
C16
open
+
C3
68uF
TP2
VIN
TP5
PGND
C14
open
C17
open
C18
open
TP16
VCC
FB
R5
10K
C15
open
C6
open
TP18
VOLTAGE SENSE
-Vout1s
TP9
+Vout1s
R1
10K
FCCM
+Vin1s
TP20
+Vin1s
+3.3V
C25
1uF
+Vdd1s
-Vdd1s
R13
open
+3.3V
TP15
-Vout1s
R14
open
TP19
FB
R11
open
TP13
SS
VSW
+Vdd2s
TP3
FCCM
SS
-Vdd2s
R2
10K
IR3477
C19
open
-Vins
PGND
VOUT
C23
open
 
Figure 4: Demoboard Schematic for VOUT = 1.05V, FS = 300kHz 
 
DEMOBOARD BILL OF MATERIALS 
QTY 
REFERENCE DESIGNATOR 
VALUE 
DESCRIPTION 
MANUFACTURER 
PART NUMBER 
4 
C1, C21, C25, C4 
1.00uF 
capacitor, X7R, 1.00uF, 25V, 0.1, 0603 
Murata 
GRM188R71E105KA12D 
1 
C10 
47uF 
capacitor, 47uF, 6.3V, 805 
TDK 
C2012X5R0J476M 
2 
C12, C20 
0.100uF 
capacitor, X7R, 0.100uF, 50V, 0.1, 603 
TDK 
C1608X7R1H104K 
1 
C2 
22.0uF 
capacitor, X5R, 22.0uF, 25V, 20%, 1206 
TDK 
C3216X5R1E226M 
1 
C3 
68uF 
capacitor, electrolytic, 86uF, 25V, 0.2, SMD 
Panasonic 
EEV‐FK1E680P 
1 
C9 
330uF 
capacitor, 330uF, 2.5V, SMD 
Sanyo 
2R5TPE330M9 
1 
L1 
1.0uH 
inductor, ferrite, 1.0uH, 20A, 2.7mOhm, SMT 
Cyntec 
PIMB103E‐1R0MS‐39 
3 
R1, R2, R5 
10.0K 
resistor, thick film, 10.0K, 1/10W, 0.01, 603 
KOA 
RK73H1J1002F 
1 
R3 
200K 
resistor, thick film, 200K, 1/10W, 0.01, 603 
KOA 
RK73H1JLTD2003F 
1 
R4 
7.50K 
resistor, thick film, 7.50K, 1/10W, 0.01, 603 
KOA 
RK73H1JLTD7501F 
1 
R7 
1.33K 
resistor, thick film, 1.33K, 1/10W, 0.01, 603 
KOA 
RK73H1J1331F 
1 
R8 
1.21K 
resistor, thick film, 1.21K, 1/10W, 0.01, 603 
KOA 
RK73H1JLTD1211F 
1 
SW1 
SPST 
switch, DIP, SPST, 2 position, SMT 
C&K Components 
SD02H0SK 
1 
U1 
IR3477 
5mm x 6mm QFN 
IRF 
IR3477MTRPBF 



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