Table 2.3
Examples of L1 Inductor Selections for Consideration (1mH)
Manufacturer
(Series)
Part Number
Temperature
Range
Taiyo-Yuden (LHL08)
LHL08-102J
-40°C to +85°C *
TDK (TSL)
TSL0808-102KR26
-40°C to +85°C
The inductors in table 2.3 are unshielded. For compact designs where the
components are located very close to one another, Echelon recommends using a
shielded construction for L1, in order to minimize the magnetic field interference on
nearby transformers, e.g., the FTT-10A transceiver. Contact your inductor
manufacturer for availability.
Suitable parts for the V+ input capacitor C1 are listed in table 2.4. C1 has the
following specifications that must be met over the device's operating temperature
range: C = 100µF ±20%, DCWV
≥
63V, Iripple
≥
100mArms @ 100kHz. Echelon
recommends the use of a high temperature rated capacitor (105
°
C minimum) due to
the increased component operating life available with this type of construction. The
application should determine the need for the extra expense.
Table 2.4
Examples of C1 Capacitor Selections (100µF,
≥
63V) For Consideration
Manufacturer
(Series)
Part Number
Temperature
Range
Panasonic
EEUFC1J101
-40°C to +85°C
Vishay
EKE00DC310J00
-40°C to +85°C
Manufacturers for the Vcc output capacitor C2 are listed in table 2.5. C2 has the
following key specifications that must be met over the device's operating
temperature range: C = 22µF ±20%, DCWV
≥
10V DC Minimum, Iripple
≥
200mArms
@ 100kHz, ESR (equivalent series resistance)
≤
1.2
Ω
Maximum @ 100kHz. Echelon
recommends the use of a high temperature rated capacitor (105
°
C minimum) due to
the increased component operating life available with this type of construction. The
application should determine the need for the extra expense. Note that the DCWV of
capacitors that can meet the ESR requirement are typically rated at greater than 50
VDC. C3 is a small 0.1µF decoupling capacitor that should be placed near C2 to
minimize switching noise.
Table
2.5 Examples of C2 Capacitor Selections (22µF,
≥
10V, Low ESR) for
Consideration
Manufacturer
(Series)
Part Number
Temperature
Range
Vishay
EKE00AA222H00
-40°C to +85°C
Nichicon (PL)
UPW1A220MHD
-40°C to +85°C
2-8
Electrical Interface