MCP18480 datasheet(13/64 Pages) MICROCHIP

13 / 64 page

 2003 Microchip Technology Inc.

DS20091B-page 13

MCP18480

FIGURE 1-7:

Current Limit Waveform.

TABLE 1-8:

CURRENT LIMIT TIMING REQUIREMENTS

Param.

No.

Parameter

Sym

Min

Typ Max Units

Conditions

MA050

External Short to Timer period start

TSHORT2TIMERS

—

171

—

MA051

Timer period

TTIMERP—

5.8

—

sec

CTIMER = 0.68 µF

RDISCH = 1.6 MΩ

MA053

ENABLE High to Timer period start

TENABLEH2TIMERS—

30.5

—

CTIMER = 0.68 µF

RDISCH = 1.6 MΩ

MA054

RESTART Low to Timer period

start

TRESTARTL2TIMERS—

30.9

—

CTIMER = 0.68 µF

RDISCH = 11.6 MΩ

MA055

External Short removed to Timer off

Note 2

TNOSHORT2TIMERO—

5.8

—

sec

CTIMER = 0.68 µF

RDISCH = 1.6 MΩ

Note 1: Minimum and maximum specifications will be provided in future revisions of this data sheet.

2: This is up to one additional timer period because the external short circuit is removed asynchronously to

the timer. The timer must time out before normal operation returns.

Timer

GATE

SENSE

MA051

ENABLE

RESTART

MA053

MA055

External Short Condition On-Board

MA054

MA050

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