3-1
[External Form、Dimensions]
Pin No.1,12 are leads bending formed.
Unit ；mm
Notes
Item Contents
Materials of leadpins φ0.5 Fe Lead with Cu,Sn and Sn-Bi Plating
Panasonic Electronic Devices Co.,Ltd.
Part Nam
e
DC-DC Converter Part No. EHDRD3318
Color Black
Material of resin Phenol denatured epoxy resin (Flame class: UL94V-0)
External appearance Without noticeable flaw and stain
Marking Silver White and clear
Bottom Edge of Substrate must be molded
Dimensions which have no tolerance show the typical values.
Terminal No.2,4,6,8,9,11 are removed.
Forming of leads
(1pin,12pin)
P=2.54
Terminal No.
Side of marking
2.0
1.8
3
12 10 5
7
2P 2P
3P
2P
6.2 6.2
3.5±0.7
42.0max.
(40.5typ.)
24.5max.
(22.5typ.)
1
2P
φ0.5
7.0max.
(4.5typ.)
RD3318
MADE IN JAPAN
lot No.
3-2
[Absolute Maximum Ratings]
[Electric Characteristics]
Ambient Temperature：25 degC
Vin=-141VDC
Iout=-150mA
Vin=-113 to -170VDC
(note1)
Vin=-113 to -170VDC
Iout=-150mA
Vin=-141VDC
Iout=0 to -150mA
Vin=-141VDC
Iout=-150m
A
(note2)
Vin=-141VDC
Iout=-300mA
note1：Please refer to the derating curve for maximum output current.
note2：The output ripple don't include the spike noise.
note3:Avoid dew condensation always.
[Test Circuit]
Vin
2Output voltage
Input voltage range
1 -113 -141 -170 VDC
－－
-300 mA
-4.50 VDCVout -5.00 -5.50
Vr
3Output current Iout
4Line regulation
3
Item
No.
－0.05 0.20 VDC
5Load regulation Vl －0.05 0.30 VDC
6Output ripple voltage Vp －0.08 0.30 Vp-p
7Efficiency η50 65 －%
Specification
Max. UnitMin. Typ.Symbol
degC
Strage Temperature Tstg -25 to +85
Condition/notes
Refer to derating curve.
Operational Temperature Avoid dew condensation
(note3)
VDC
2 Topr -20 to +75 degC
1 Vin -170
Power Suppl
y
Item Symbol Rating Unit Remarks
EHDRD3318
Part Nam
e
DC-DC Converter Part No.
Panasonic Electronic Devices Co.,Ltd.
No.
We recommend Low impedance Aluminium capacitor for power supply.
Load
Choke Coil
(ELC12D471E)
470μH／1.25A
EHDRD3318
L1-1 OUTGND
+
220μF
/35V
+
Vin
135712
Vout
Iout
L1-2
IN
33μF
/200V
NC
10
3-3
[Application]
Note）For safety, please use fuse.
[Derating Curve] Vin=-113V to -170VDC
[Circuit Diagram]
Panasonic Electronic Devices Co.,Ltd.
EHDRD3318
Part Nam
e
DC-DC Converter Part No.
Load
We recommend Low impedance Aluminium capacitor for power supply.
Derating Curve
0
100
200
300
-25 0 25 50 75 100
Ambient temperature Ｔａ[℃]
Output
current Ｉｏｕｔ[ｍＡ]
Over-current
detector
Control circuit
1
OUT
12
IN
7
GND
Improvement
circuit of
efficiency
53
L1-1
L1-2
EHDRD3318
L1-1IN OUTGND
+
135712
Vou
t
Iout
L1-2
+33μF
/200V
220μF
/35V
A
C100V
±20%
FUSE
0.1μF
/50V
C2
(50/60Hz)
NC
10
10
NC
Choke Coil
(ELC12D471E)
470μH／1.25
A
