33887 datasheet(13/37 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33887

ELECTRICAL CHARACTERISTICS

TIMING DIAGRAMS

Figure 10. Operating States

Figure 11. Example Short Circuit Detection Detail on Low-Side MOSFET

Active

Current

Limiting

>8A

6.5

Short Circuit Detection Threshold

Typical Current Limit Threshold

Hard Short Detection and Latch-OFF

IN1 or IN2

IN2 or IN1

IN1 or IN2

IN2 or IN1

IN1 IN2

[1]

[0]

[1]

[0]

[1]

[0]

[1]

[0]

Outputs

Tri-Stated

Outputs

Tri-Stated

Outputs Operation

(per Input Control Condition)

Time

High Current Load Being Regulated via Constant-OFF-Time PWM

Moderate Current Load

on Low-Side

MOSFET

Overcurrent Minimum Threshold

8.0

TIME

Typical PWM Load

Current Limiting

Waveform

Hard Output

Short Latch-OFF

ta = Tristate Output OFF Time

tb = Current Limit Blank Time

6.5

Hard Short Detection

Short Circuit Detect Threshold

ta = Output Constant-OFF Time

tb = Output Blanking Time

ISCL Short Circuit Detection Threshold

Typical Current

Limiting Waveform

5.0

8.0

Hard short occurs.

Hard short is detected during tb

ILIM Blanking Time

ton

0.0

and output is latched-off.

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