DC-DC Converter
QHL300 Series
Application Notes
Conducted and Radiated Emissions - Class A
CY5
CY3
Bead
Core
Bead
Core
CASE
+Vo
-Vo
+Vout
+S
+Vin
Fuse
L1
L2
+Vin
-Vin
C4
C5
C6-8
TVS
C1
C2
C3
QHL300
-S
-Vout
-Vin
CY4
Bead
Core
CASE
CY2
CY1
CY6
Bead
Core
Bead
Core
Bead
Core
Ground
Model Number
C1
C2
C3*
C4
C5
C6
C7
C8
QHL300300S05
QHL300300S48
QHL300300Sxx
0.22µF/630V
0.22µF/630V
0.22µF/630V
0.22µF/630V
0.22µF/630V
0.22µF/630V
150µF/450V
150µF/450V
150µF/450V
4.7µF/50V
4.7µF/100V
4.7µF/50V
4.7µF/50V
4.7µF/100V
4.7µF/50V
0.47µF/250V
0.47µF/250V
0.47µF/250V
0.47µF/250V
0.47µF/250V
0.47µF/250V
0.47µF/250V
0.47µF/250V
0.47µF/250V
Model Number
QHL300300S05
QHL300300S48
QHL300300Sxx
CY1
CY2
CY3
CY4
CY5
CY6
L1
L2
Bead Core
100pF
100pF
100pF
1500pF
1500pF
1500pF
1500pF
1500pF
1500pF
1500pF
1500pF
1500pF
4700pF
4700pF
4700pF
4700pF
4700pF
4700pF
5.5mH/5A
5.5mH/5A
5.5mH/5A
5.5mH/5A
CY1, CY3, CY4
CY3, CY4
5.5mH/5A
5.5mH/5A
CY3, CY4
Notes
C1, C2, C4- C8: Ceramic capacitors, C3 aluminum capacitor.
CY1, CY2, CY3, CY4, CY5, CY6: Ceramic
BEAD CORE: 4.0 x 2.0 x 1.5mm
TVS 440V
I
2.1A example, SMCJ440A
R PP
Fuse 5A time delay
*For operation below -20°C ambient C3 capacitance should be doubled, e.g. type Nippon Chemi-Con KXG or KXJ series.
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07 Oct 19