MAX14521E_15 Datasheet, PDF (19/21 Pages) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

MAX14521E
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
discharged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest, 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 induc-
tance. For most applications, the primary series resis-
tance (DCR) should be below 1Ω for reasonable effi-
ciency. Do not exceed the inductor’s saturation current.
See Table 15 for a list of recommended tappedinductors.
R_C
R_D
1MΩ
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%
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
AMPERES
36.8%
10%
0
0 _tRL
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
www.maximintegrated.com
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