Rainbow-electronics MAX16054 Manual de usuario descargar pdf (Pagina 6)

MAX16054

Human Body Model

Figure 2a shows the Human Body Model, and Figure

2b 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 interest,

which is then discharged into the test device through a

1.5kΩ resistor.

IEC 61000-4-2

The IEC 61000-4-2 standard covers ESD 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 IEC 61000-4-2, with-

out the need for additional ESD-protection components.

The major difference between tests done using the

Human Body Model and IEC 61000-4-2 is higher peak

current in IEC 61000-4-2, because series resistance is

lower in the IEC 61000-4-2 model. Hence, the ESD with-

stand voltage measured to IEC 61000-4-2 is generally

lower than that measured using the Human Body Model.

Figure 3a shows the IEC 61000-4-2 model, and Figure

3b shows the current waveform for the IEC 61000-4-2

ESD Contact-Discharge test.

The Air-Gap test involves approaching the device with a

charged probe. The Contact-Discharge method connects

the probe to the device before the probe is energized.

Machine Model

The Machine Model for ESD tests all pins using a

200pF storage capacitor and zero discharge resis-

tance. Its objective is to emulate the stress caused by

contact that occurs with handling and assembly during

manufacturing.

On/Off Controller with Debounce and

±15kV ESD Protection

6 _______________________________________________________________________________________

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

100pF

1MΩ

1500Ω

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

Figure 2a. Human Body ESD Test Model

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

150pF

50MΩ to 100MΩ

330Ω

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

Figure 2b. Human Body Current Waveform

100%

90%

36.8%

TIME

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

10%

AMPERES

Figure 3a. IEC 61000-4-2 ESD Test Model

= 0.7ns TO 1ns

30ns

60ns

100%

90%

10%

PEAK

Figure 3b. IEC 61000-4-2 ESD Generator Current Waveform

1 2 3 4 5 6 7 8 9

MAX16054 1
±15kV ESD Protection 1

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