Data Sheet
18V/500mA Output
Step-down DC/DC Converter(Non-isolated)
BP5226-18
Absolute Maximum Ratings
Parameter
Input voltage
Operating temperature range
Storage temperature range
Maximum surface temperature
Maximum output current
Symbol
Vi
Topr
Tstg
Dimensions (Unit :
mm
)
Limits
Unit
V
Conditions
DC
Refer to derating curve
(Ambient temperature +
the module self-heating) Tcmax
°C
°C
°C
mApk
Tcmax
Iomax
Electrical Characteristics
Symbol
Parameter
Input voltage range
Output voltage
Output current
Line regulation
Load regulation
Output ripple voltage
CTL pin OFF voltage
CTL pin ON voltage
CTL terminal pull-up resistance
Power conversion efficiency
Min.
Typ.
Max.
Unit
Conditions
DC
Vi=34V, Io=500mA
Vi=34V
Vi=20 to 46V, Io=500mA
Vi=34V, Io=0 to 500mA
Vi=34V, Io=500mA
SW1 OFF (VoOFF)
SW1 ON (VoON)
Vi=34V, Io=500mA
Derating Curve
600
Output Current Io(mA)
500
400
300
200
100
0
-30 -20 -10 0 10 20 30 40 50 60 70 80 90
Ambient Temperature Ta(
°C
)
Operation Range
Derating Curve
Conversion Efficiency
100
80
60
Conversion Efficiency
(Ta=25
°C
, Vi=34V)
Application Circuit
BP5226-18
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
Function
Output terminal:Vo(18V)
CTL terminal
Power inductor terminal
Skip
Power inductor terminal
Skip
COMMON
Skip
Skip
Input terminal
N.C.
Input terminal
40
20
0
0
100
200
300 400
Output Current Io(mA)
500
1211 10
7
5
321
Io
Load Regulation
20.0
18.0
16.0
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0
Load Regulation
(Ta=25
°C
, Vi=12V)
Output Voltage Vo(V)
AC24V
D1
FUSE
L1
Ctl
C1
C2
Vo
Be sure to use fuse for safety.
Please verify operation and characteristics in the customer's circuit before actual usage.
Ensure that the load current does not exceed the maximum rating.
Input terminal is 10 and 12.
External Component Specifications
FUSE: fuse
C1: Input capacitor
C2: Output capacitor
L1: Power inductor
D1: Diode
Above 60V, current:above 1.0A
Use a quick-acting fuse (1.8A)
0 100 200 300 400 500 600 700 800
Output Current Io(mA)
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1/1
2010.03 -
Rev. B
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