PYB20 Datasheet, PDF (5/7 Pages) CUI INC – DC-DC CONVERTER

CUI Inc │ SERIES: PYB20 │ DESCRIPTION: DC-DC CONVERTER
date 08/15/2013 │ page 5 of 7
DERATING CURVES
Single Output Voltage ≤ 5 V
With heatsink
100
80
Without heatsink
60
Safe operating area
40
20
-40 -20
0
20
40
60 70 8085
Ambient Temperature (°C)
Single Output Voltage > 5 V
With heatsink
100
80
Without heatsink
60
Safe operating area
40
20
-40 -20
0
20
40
60 75 85
Ambient Temperature (°C)
Dual Output Voltage ≤ 5 V
With heatsink
100
80
Without heatsink
60
Safe operating area
40
20
Dual Output Voltage > 5 V
With heatsink
100
80
Without heatsink
60
Safe operating area
40
20
-40 -20
0
20
40
65 75 85
Ambient Temperature (°C)
-40 -20
0
20
40
60 70 8085
Ambient Temperature (°C)
EMC RECOMMENDED CIRCUIT
Figure 1
V in
GND
FUSE
MOV
CY2
LDM1
TVS
+
C0
LDM2
C1
(a)
(b) CY1
Vin
+Vo
EUT LOAD
GND
- Vo
(0V)
TEST CONFIGURATION
Oscilloscope
Lin
Figure 2
DC DC ^Current
Cin ^Probe
Load
Table 1
Recommended external circuit components
Vin (Vdc)
24
48
FUSE Choose according to input current
MOV
S14K35
S14K60
LDM1
56μH
56μH
TVS
SMCJ48A
SMCJ90A
C0
330μF/50V
330μF/100V
C1
1μF/50V
1μF/100V
LDM2
4.7μH
4.7μH
CY1
1nF/2KV
1nF/2KV
CY2
1nF/2KV
1nF/2KV
Table 2
External components
Lin
4.7μH
Cin
220μF, ESR < 1.0Ω
at 100 KHz
Note:
Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate source impedance.
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