33981 datasheet(7/37 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33981

DYNAMIC ELECTRICAL CHARACTERISTICS

STATIC ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 4. Dynamic Electrical Characteristics

Characteristics noted under conditions 6.0 V

≤ VPWR ≤ 27 V, -40°C ≤ TA ≤ 125°C, unless otherwise noted. Typical values noted

reflect the approximate parameter mean at TA = 25°C under nominal conditions, unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

CONTROL INTERFACE AND POWER OUTPUT TIMING (CBOOT, VPWR)

Charge Blanking Time (CBOOT)(12)

tON

μs

Output Rising Slew Rate

VPWR = 13 V, from 10% to 90% of VOUT, SR Capacitor = 4.7 nF,

RL= 5.0 Ω

SRR

8.0

μs

Output Falling Slew Rate

VPWR = 13 V, from 90% to 10% of VOUT, SR Capacitor = 4.7 nF,

RL= 5.0 Ω

SRF

8.0

μs

Output Turn-ON Delay Time(13)

VPWR = 13 V, SR Capacitor = 4.7 nF

tDLYON

200

400

700

Output Turn-OFF Delay Time(14)

VPWR = 13 V, SR Capacitor = 4.7 nF

tDLYOFF

500

1000

1500

Input Switching Frequency(11)

fPWM

–

kHz

Output PWM ratio @ 60 kHz(15)

RPWM

5.0

Time to Reset Fault Diagnosis

(overload on high side or external low side)

tRSTDIAG

100

200

400

μs

Output Over-current Detection Time

tOCH

1.0

μs

Notes

11.

The MC33981 can work down (~100Hz). The fault management reset can not be guaranteed with PWM frequency lower than 5.0 kHz

(INHS=0 during 200

μs typ)

12.

Values for CBOOT=100 nF. Refer to the paragraph entitled Sleep Mode on page 13. Parameter is guaranteed by design and not

production tested.

13.

Turn-ON delay time measured from rising edge of INHS that turns the output ON to VOUT = 0.5 V with RL= 5.0 Ω resistive load.

14.

Turn-OFF delay time measured from falling edge of INHS that turns the output OFF to VOUT = VPWR -0.5 V with RL= 5.0 Ω resistive load.

15.

The ratio is measured at VOUT = 50% VPWR without SR capacitor. The device is capable of 100% duty cycle.

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