US3034 데이터 시트보기 (PDF) - Unisem
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US3034 Datasheet PDF : 9 Pages
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TYPICAL APPLICATION
5V to 3.3V with lossles short cicuit protection(output UVLO detection).
US3034
C8
12V
L1
5V
C1
8765
SS CS+ CS- Gnd
US3034
Drv V12 Vfb Vhyst
1234
C3
R3
C5
R1
Q2
C2
C4
R2 D1
R7
R6
C6
L2
R4
R5
3034app5-1.1
Vout
C7
Figure 5- The circuit in figure 5 is designed to provide lossles 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 8 mil ohm resistance the peak C.L is set at 10A. See application note on how to set the
current limiting threshold.
Ref Desig Description
U1
Switcher IC
Q2
MOSFET
D1
Schottky Diode
L2
Inductor
L1
R1,2
R3
R4
R5
R7
R6
C1
C2
C3
C5
C6
C7
C8
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Qty
Part #
1 US3034CS ( 8 pin SOIC)
1 IRL3303 (TO263)
1 PBYR735(Axial Thr Hole pkg)
PBYR1035B(SMT, TO263 pkg)
1 Core:T50-18,L=4 uH
Turns: 7T, 18 AWG
1 L=1 uH
2 10 ohm,5%, SMT
1 182 kohm,1%, SMT
1 1 kohm,1%, SMT
1 576ohm,1%, SMT
1 3.83 kohm,1%, SMT
1 1 kohm,1% , SMT
1 470uF, Elect
1 6MV1000GX, 1000uF,6.3V, Elect
1 1 uF,Ceramic, SMT
1 10 pF,Ceramic, SMT
1 0.1 uF
2 6MV1000GX, 1000uF,6.3V, Elect
1 0.047 uF
Manufacturer
Unisem
International
Rectifier
Motorola
Micro Metal
(core)
Sanyo
Sanyo
Sanyo
Rev. 1.8
1/13/99
4-7
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