On/Off Controller with Debounce and
15ꢀk ꢁED ꢂrotection
Human Body Model
Figure ±a shows the Human Body Model, and Figure
±b shows the current waꢁeform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the VꢃE ꢁoltage of interest,
which is then discharged into the test deꢁice through a
1.5ꢂΩ resistor.
lower in the IVC 61000-4-± model. Hence, the VꢃE with-
stand ꢁoltage measured to IVC 61000-4-± is generally
lower than that measured using the Human Body Model.
Figure 3a shows the IVC 61000-4-± model, and Figure
3b shows the current waꢁeform for the IVC 61000-4-±
VꢃE Contact-Eischarge test.
The Air-Gap test inꢁolꢁes approaching the deꢁice with a
charged probe. The Contact-Eischarge method connects
the probe to the deꢁice before the probe is energized.
IꢂC 6ꢀ000-4-±
The IVC 61000-4-± standard coꢁers VꢃE testing and
performance of finished equipment; it does not specifi-
cally refer to integrated circuits. The MAX16054 helps in
the design of equipment that meets IVC 61000-4-±, with-
out the need for additional VꢃE-protection components.
MAX16054
Maꢄhine Model
The Machine Model for VꢃE tests all pins using a
±00pF storage capacitor and zero discharge resis-
tance. Its objectiꢁe is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing.
The major difference between tests done using the
Human Body Model and IVC 61000-4-± is higher peaꢂ
current in IVC 61000-4-±, because series resistance is
R
R
D
330Ω
R
C
R
1MΩ
D
C
50MΩ to 100MΩ
1500Ω
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
s
150pF
STORAGE
CAPACITOR
C
s
100pF
STORAGE
CAPACITOR
SOURCE
SOURCE
Figure 3a. IVC 61000-4-± VꢃE Test Model
Figure ±a. Human Body VꢃE Test Model
I
100%
90%
I 100%
P
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
AMPERES
36.8%
10%
0
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
10%
Figure ±b. Human Body Current Waꢁeform
t
t
= 0.7ns TO 1ns
R
30ns
60ns
Figure 3b. IVC 61000-4-± VꢃE Generator Current Waꢁeform
_______________________________________________________________________________________
6
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
