MAX14521E Datasheet, PDF (19/20 Pages) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

Quad, High-Voltage EL Lamp Driver
with I²C Interface
ESD Test Conditions
ESD performance depends on a number of conditions.
The MAX14521E are specified for ±15kV (HBM) typical
ESD resistance on the EL lamp outputs.
HBM ESD Protection
Figure 8a shows the Human Body Model, and Figure
8b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the device through a
1.5kΩ resistor.
Design Procedure
LX Inductor Selection
The recommended tapped-inductor ratio is 1:7 with a
2.3µH primary inductance and 115µH secondary
inductance. For most applications, the primary series
resistance (DCR) should be below 1Ω for reasonable
efficiency. Do not exceed the inductor’s saturation cur-
rent. See Table 15 for a list of recommended tapped-
inductors.
R_C
1MΩ
R_D
1.5kΩ
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 8a. Human Body ESD Test Model
Table 15. Inductor Vendors
INDUCTOR VALUE (µH)
2.3/115
2.3/115
VENDOR
Coilcraft
Cooper
I_P 100%
90%
AMPERES
36.8%
10%
0
0 _tRL
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
TIME
t_DL
CURRENT WAVEFORM
Figure 8b. Human Body Current Waveform
URL
www.coilcraft.com
www.cooper.com
PART NUMBER
GA3250-BL
CTX03-18210-R
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