Rainbow Electronics MAX14514 - Manual (Page 12)

MAX14514
Design Procedure
LX Inductor Selection
The recommended inductor values are 220µH/330µH.
For most applications, series resistance (DCR) should
be below 8
Ω for reasonable efficiency. Do not exceed
the inductor’s saturation current.
Dual Electroluminescent Lamp Driver
12 ______________________________________________________________________________________
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR Cs
100pF
R
C
1M Ω
R D
1500 Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 1a. Human Body ESD Test Model
I P 100%
90%
36.8%
t RL
TIME
t DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE) Ir
10%
0
0
AMPS
Figure 1b. Human Body Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR Cs
150pF
R C
50M Ω TO 100MΩ
R D
330 Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 1c. IEC 61000-4-2 ESD Test Model
t r = 0.7ns TO 1ns
30ns
60ns
t
100%
90%
10%
I PEAK
I
Figure 1d. IEC 61000-4-2 ESD Generator Current Waveform
INDUCTOR VALUE (µH) VENDOR WEBSITE PART
220 TOKO www.tokoam.com D312C 1001BS-221M
330 Coilcraft www.coilcraft.com DO1608C-334ML
470 Coilcraft www.coilcraft.com DO1608C-474ML
220 Coilcraft www.coilcraft.com LPS4018-224ML
330 Coilcraft www.coilcraft.com LPS4018-334ML
470 Coilcraft www.coilcraft.com LPS4018-474ML
220 Cooper Bussmann www.cooperet.com SDH3812-221-R
220 Cooper Bussmann www.cooperet.com SD3110-221-R
Table 2. Inductor Vendors