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MC33931 数据表(PDF) 8 Page - Freescale Semiconductor, Inc

部件名 MC33931
功能描述  5.0 A Throttle Control H-bridge
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

MC33931 数据表(HTML) 8 Page - Freescale Semiconductor, Inc

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Table 4. Dynamic Electrical Characteristics
Characteristics noted under conditions 5.0 V
≤ VPWR ≤ 28 V, -40°C ≤ TA ≤ 125°C, GND = 0 V, unless otherwise noted. Typical
values noted reflect the approximate parameter means at TA = 25°C under nominal conditions, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
TIMING CHARACTERISTICS
PWM Frequency(20)
fPWM
11
kHz
Maximum Switching Frequency During Current Limit Regulation(21)
fMAX
20
kHz
Output ON Delay(22)
PWR
V
tDON
18
μs
Output OFF Delay(22)
PWR
V
tDOFF
12
μs
ILIM Output Constant-OFF Time(23) (25)
tA
15
20.5
32
μs
ILIM Blanking Time(24) (25)
tB
12
16.5
27
μs
Disable Delay Time(26)
tDDISABLE
8.0
μs
Output Rise and Fall Time(27)
tF, tR
1.5
3.0
8.0
μs
Short-circuit/Over-temperature Turn-OFF (Latch-OFF) Time(28),(29)
tFAULT
8.0
μs
Power-ON Delay Time(29)
tPOD
1.0
5.0
ms
Output MOSFET Body Diode Reverse Recovery Time(29)
tRR
75
100
150
ns
Charge Pump Operating Frequency(29)
fCP
7.0
MHz
Notes
20.
The maximum PWM frequency should be limited to frequencies < 11 kHz in order to allow the internal high side driver circuitry time to
fully enhance the high side MOSFETs.
21.
The internal current limit circuitry produces a constant-OFF-time Pulse Width Modulation of the output current. The output load’s
inductance, capacitance, and resistance characteristics affect the total switching period (OFF-time + ON-time), and thus the PWM
frequency during current limit.
22.
* Output Delay is the time duration from 1.5 V on the IN1 or IN2 input signal to the 20% or 80% point (dependent on the transition direction)
of the OUT1 or OUT2 signal. If the output is transitioning HIGH-to-LOW, the delay is from 1.5 V on the input signal to the 80% point of
the output response signal. If the output is transitioning LOW-to-HIGH, the delay is from 1.5 V on the input signal to the 20% point of the
output response signal. See Figure 4, page 9.
23.
The time during which the internal constant-OFF time PWM current regulation circuit has tri-stated the output bridge.
24.
The time during which the current regulation threshold is ignored so that the short-circuit detection threshold comparators may have time
to act.
25.
Parameter is Guaranteed By Characterization.
26.
* Disable Delay Time measurement is defined in Figure 5, page 9.
27.
Rise Time is from the 10% to the 90% level and Fall Time is from the 90% to the 10% level of the output signal with VPWR
RLOAD = 3.0 ohm. See Figure 6, page 9.
28.
Load currents ramping up to the current regulation threshold become limited at the ILIM value (see Figure 7). The short-circuit currents
possess a di/dt that ramps up to the ISCH or ISCL threshold during the ILIM blanking time, registering as a short-circuit event detection and
causing the shutdown circuitry to force the output into an immediate tri-state latch-OFF (see Figure 8). Operation in Current Limit mode
may cause junction temperatures to rise. Junction temperatures above ~160
°C will cause the output current limit threshold to “fold back”,
or decrease, until ~175
°C is reached, after which the TLIM thermal latch-OFF will occur. Permissible operation within this fold back region
is limited to non-repetitive transient events of duration not to exceed 30 seconds (see Figure 9).
29.
Parameter is Guaranteed By Design.
Analog Integrated Circuit Device Data
8
Freescale Semiconductor
33931
ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
V
= 14
V
= 14
= 14 V,


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