33886 datasheet(9/25 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33886

TIMING DIAGRAMS

Figure 8. Active Current Limiting Versus Time

Figure 9. Active Current Limiting Detail

[0]

[1]

Hard Short Detect and Latch-OFF

Typ. Short Ckt. Detect Threshold

PWM

Current

Limiting

(See Figure 6)

8.0

6.5

Outputs

Tristated

TIME

[0]

[1]

[0]

[1]

IN1 IN2

IN2

IN1

Outputs Operational

(per Input Control Condition)

Typ. Current Limit Threshold

Outputs

Tristated

IN2

IN1

IN1OR IN2

IN2ORIN1

Diode Reverse

Recovery Spikes

(See Figure 7)

ISCL Short Circuit Detect Threshold

for Low-Side FETs

Typical Current Limiting Threshold

Load Capacitance and/or

Diode Reverse Recovery Spikes

Hard Short Detect and Latch-Off

IN1 or IN2

IN2 or IN1

IN1 or IN2

IN2 or IN1

IN1 IN2

Outputs

Tri-stated

Outputs

Tri-stated

Outputs Operational

(per Input Control Condition)

Active

Current

Limiting

(See Figure 7)

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 Detect

Latch-Off Prevented During tb

Short Circuit Detect Threshold

ta = Output Latch-OFF Time

tb = Output Blanking Time

ISCL Short Circuit Detect Threshold

Typical Current

Limiting Waveform

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