User`s guide

LONWORKS LPT-10 Transceiver User’s Guide 2-9
Table 2.4 Example L1 Inductor Selections (1mH)
Manufacturer
(Series)
Part Number Temperature
Range
Application
Taiyo-Yuden (LHL08) LHL08-102J -25°C to +85°C * General
Stetco (09P) 09P-102J -25°C to +85°C General
TDK (TSL) TSL0807-102KR23 -20°C to +80°C General
Caddell-Burns (0780) 0780-37 -55°C to +105°C Wide Temp.
* Note: Echelon has tested the Taiyo-Yuden part from -40°C to +85°C.
Suitable parts for the V+ input capacitor C1 are listed in table 2.5. C1 has the
following key specifications that must be met over the node's operating temperature
range: C = 100µF ±20%, DCWV ≥ 63V, I
ripple
≥ 100mA
rms
@ 100kHz. Electrolytic
capacitors come in several grades depending on the total expected life of the product at
its highest operating temperature. For example, the Panasonic SU series capacitor
listed in table 2.5 has a rated life of 2000 hours at 85°C. Electrolytic capacitor life
approximately doubles for every 10°C reduction of the operating temperature, so a 2000
hour part (less than three months at 85°C) should last about 32,000 hours (three and a
half years) if operated at 45°C. Link power nodes that will be operating near the upper
end of the LPT-10 transceiver’s -40°C to +85°C temperature range will need to use
"high-reliability" electrolytic capacitors (like the Panasonic HFZ series) to ensure
adequate product life.
Table 2.5 Example C1 Capacitor Selections (100µF, ≥63V)
Manufacturer
(Series)
Part Number Temperature
Range
Application
Panasonic (SU) ECEA1JU101 -40°C to +85°C General
Panasonic (NHE) ECEA1JGE101 -55°C to +105°C 8000 hr. @ +85°C
Panasonic (HFZ) ECA1JFZ101 -55°C to +105°C 20,000 hr. @ +85°C
Sprague (515D) 515D107M063CC6A -40°C to +85°C General
Sprague (511D) 511D107M075CG4D -40°C to +105°C 8000 hr. @ +85°C, 75V
Nichicon (VX) UVX1J101MPA -40°C to +85°C General
Nichicon (VZ) UVZ1J101MPH -55°C to +105°C 4000 hr. @ +85°C
Manufacturers for the Vcc output capacitor C2 are listed in table 2.6. C2 has the
following key specifications that must be met over the node's operating temperature
range: C = 22µF ±20%, DCWV ≥ 10V, I
ripple
≥ 200mA
rms
@ 100kHz, ESR (equivalent
series resistance) ≤ 1.2Ω @ 100kHz. The lifetime considerations mentioned above for
C1 also apply to the life of C2. In addition, since C2 is the output capacitor for the LPT-
10 transceiver's switching power supply circuit, it needs to have a low value of ESR to
avoid excessive ripple on Vcc from the 150kHz switching currents. Low ESR capacitors