US3034CS UNISEM, US3034CS Datasheet - Page 7

• Manufacturer Part Number: US3034CS
• Description: 8 PIN PWM SWITCHER CONTROLLER IC
• Manufacturer: UNISEM

Rev. 1.8
1/13/99
Figure 5- The circuit in figure 5 is designed to provide lossles output short detection by detecting the dc voltage across the inductor
TYPICAL APPLICATION
TYPICAL APPLICATION
5V to 3.3V with lossles short cicuit protection(output UVLO detection).
Ref Desig
U1
Q2
D1
L2
L1
R1,2
R3
R4
R5
R7
R6
C1
C2
C3
C5
C6
C7
C8
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 8 mil ohm resistance the peak C.L is set at 10A. See application note on how to set the
current limiting threshold.
Description
Switcher IC
MOSFET
Schottky Diode
Inductor
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
12V
5V
C1
C8
L1
Qty
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
2
1
C2
R1
C3
Q2
Drv V12 Vfb Vhyst
SS
US3034CS ( 8 pin SOIC)
IRL3303 (TO263)
PBYR735(Axial Thr Hole pkg)
PBYR1035B(SMT, TO263 pkg)
Core:T50-18,L=4 uH
Turns: 7T, 18 AWG
L=1 uH
10 ohm,5%, SMT
182 kohm,1%, SMT
1 kohm,1%, SMT
576ohm,1%, SMT
3.83 kohm,1%, SMT
1 kohm,1% , SMT
470uF, Elect
6MV1000GX, 1000uF,6.3V, Elect
1 uF,Ceramic, SMT
10 pF,Ceramic, SMT
0.1 uF
6MV1000GX, 1000uF,6.3V, Elect
0.047 uF
8
1 2 3 4
US3034
CS+
7
CS-
6
C4
Gnd
5
R2
Part #
R3
D1
C5
3034app5-1.1
R6
L2
R4
R5
C6
R7
Manufacturer
Micro Metal
International
Motorola
C7
Unisem
Rectifier
(core)
Sanyo
Sanyo
Sanyo
Vout
US3034
4-7