iru3034 International Rectifier Corp., iru3034 Datasheet - Page 7

• Manufacturer Part Number: iru3034
• Description: 8-pin Pwm Switcher Controller Ic With Current Limiting -
• Manufacturer: International Rectifier Corp.

TYPICAL APPLICATION
5V to 3.3V with loss-less short circuit protection (Output UVLO detection)
Figure 5 - The circuit in figure 5 is designed to provide loss-less output short detection by detecting the DC voltage
across the inductor and shutting down the MOSFET and entering HICCUP mode. Note that the current limit point
is a function of the inductor resistance and in this application with approximately 8m resistance the peak CL is
set at 10A. See application note on how to set the current limiting threshold.
12V
5V
Ref Desig
U1
Q2
D1
L2
L1
R1,2
R3
R4
R5
R7
R6
C1
C2
C3
C5
C6
C7
C8
C1
L1
C8
C3
Description
Switcher IC
MOSFET
Schottky Diode
Inductor
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
C2
R1
V
12
Q2
Drv
SS
Qty
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
2
1
CS- CS+
U1
V
FB
IRU3034CS (8-Pin SOIC)
IRL3303 (TO-263)
PBYR735 (Axial Thru Hole pkg)
PBYR1035B (SMT, T-263 pkg)
Core: T50-18, L=4 H
Turns: 7T, 18 AWG
L= H
10 , 5%, SMT
182K , 1%, SMT
1K , 1%, SMT
576 , 1%, SMT
3.83K , 1%, SMT
1K , 1%, SMT
470 F, Elect
6MV1000GX, 1000 F, 6.3V, Elect
1 F, Ceramic, SMT
10pF, Ceramic, SMT
0.1 F
6MV1000GX, 1000 F, 6.3V, Elect
0.047 F
V
HYST
C4
Gnd
R2
R3
www.irf.com
D1
Part #
C5
R6
L2
IRU3034 & (PbF)
C6
R4
R5
R7
Micro Metal
Motorola
Manuf
(core)
Sanyo
Sanyo
Sanyo
IR
IR
C7
V
OUT
7